Log4j2 XML 配置示例

àì夳堔傛蜴生んèń 2023-10-02 13:01 13阅读 0赞

[Apache Log4j2][]是对 Log4j 1.x 的升级，与其前身相比提供了重大改进，例如性能改进、修改后的配置文件的自动重新加载、[Java 8 lambda][]支持和自定义日志级别。

Log4j 2.4 及更高版本需要 Java 7。版本 2.0-alpha1 到 2.3 需要 Java 6。

### **1. Log4j2 Maven 依赖** ###

要在项目中包含**Log4j2**，请包含以下 maven 依赖项。

<table>  
 <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;">pom.xml</span></span></span>  
 <tbody> 
  <tr> 
   <td style="text-align:left;vertical-align:baseline;"> 
    <div style="margin-left:0;text-align:left;"> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&lt;</code><code>dependency</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>groupId</code><code>&gt;org.apache.logging.log4j&lt;/</code><code>groupId</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>artifactId</code><code>&gt;log4j-api&lt;/</code><code>artifactId</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>version</code><code>&gt;2.6.1&lt;/</code><code>version</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&lt;/</code><code>dependency</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&lt;</code><code>dependency</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>groupId</code><code>&gt;org.apache.logging.log4j&lt;/</code><code>groupId</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>artifactId</code><code>&gt;log4j-core&lt;/</code><code>artifactId</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>version</code><code>&gt;2.6.1&lt;/</code><code>version</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&lt;/</code><code>dependency</code><code>&gt;</code></span></span></span></span> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

### **2. Log4j2.xml – 控制台日志** ###

您可以使用以下`log4j2.xml`文件将输出记录到控制台。请注意，如果找不到配置文件，`DefaultConfiguration`则将使用。这也会导致日志输出进入控制台。

### **3. Log4j2.xml – 滚动文件追加器** ###

您可以使用以下`log4j2.xml`文件将输出记录到基于日期的滚动文件中 - 以及控制台。

### **4. Log4j2.xml – 多文件追加器** ###

使用这个**简单`log4j2.xml`**来快速参考**多个日志文件中的**日志语句。它记录不同级别的日志（`debug`，`info`等等），以不同的文件，使用`LevelRangeFilter`，让您的日志干净，分隔，便于分析。

<table>  
 <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;">log4j2.xml</span></span></span>  
 <tbody> 
  <tr> 
   <td style="text-align:left;vertical-align:baseline;"> 
    <div style="margin-left:0;text-align:left;"> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&lt;?</code><code>xml</code> <code>version</code><code>=</code><code>"1.0"</code> <code>encoding</code><code>=</code><code>"UTF-8"</code><code>?&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&lt;</code><code>Configuration</code> <code>status</code><code>=</code><code>"WARN"</code> <code>monitorInterval</code><code>=</code><code>"30"</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;">&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;!-- Logging Properties --&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Properties</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Property</code> <code>name</code><code>=</code><code>"LOG_PATTERN"</code><code>&gt;%d{yyyy-MM-dd'T'HH:mm:ss.SSSZ} %p %m%n&lt;/</code><code>Property</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Property</code> <code>name</code><code>=</code><code>"APP_LOG_ROOT"</code><code>&gt;c:/temp&lt;/</code><code>Property</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Properties</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Appenders</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;!-- Console Appender --&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Console</code> <code>name</code><code>=</code><code>"Console"</code> <code>target</code><code>=</code><code>"SYSTEM_OUT"</code> <code>follow</code><code>=</code><code>"true"</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>PatternLayout</code> <code>pattern</code><code>=</code><code>"${LOG_PATTERN}"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Console</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;!-- File Appenders on need basis --&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>RollingFile</code> <code>name</code><code>=</code><code>"frameworkLog"</code> <code>fileName</code><code>=</code><code>"${APP_LOG_ROOT}/app-framework.log"</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>filePattern</code><code>=</code><code>"${APP_LOG_ROOT}/app-framework-%d{yyyy-MM-dd}-%i.log"</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>LevelRangeFilter</code> <code>minLevel</code><code>=</code><code>"ERROR"</code> <code>maxLevel</code><code>=</code><code>"ERROR"</code> <code>onMatch</code><code>=</code><code>"ACCEPT"</code> <code>onMismatch</code><code>=</code><code>"DENY"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>PatternLayout</code> <code>pattern</code><code>=</code><code>"${LOG_PATTERN}"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>SizeBasedTriggeringPolicy</code> <code>size</code><code>=</code><code>"19500KB"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>DefaultRolloverStrategy</code> <code>max</code><code>=</code><code>"10"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>RollingFile</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>RollingFile</code> <code>name</code><code>=</code><code>"debugLog"</code> <code>fileName</code><code>=</code><code>"${APP_LOG_ROOT}/app-debug.log"</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>filePattern</code><code>=</code><code>"${APP_LOG_ROOT}/app-debug-%d{yyyy-MM-dd}-%i.log"</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>LevelRangeFilter</code> <code>minLevel</code><code>=</code><code>"DEBUG"</code> <code>maxLevel</code><code>=</code><code>"DEBUG"</code> <code>onMatch</code><code>=</code><code>"ACCEPT"</code> <code>onMismatch</code><code>=</code><code>"DENY"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>PatternLayout</code> <code>pattern</code><code>=</code><code>"${LOG_PATTERN}"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>SizeBasedTriggeringPolicy</code> <code>size</code><code>=</code><code>"19500KB"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>DefaultRolloverStrategy</code> <code>max</code><code>=</code><code>"10"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>RollingFile</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>RollingFile</code> <code>name</code><code>=</code><code>"infoLog"</code> <code>fileName</code><code>=</code><code>"${APP_LOG_ROOT}/app-info.log"</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>filePattern</code><code>=</code><code>"${APP_LOG_ROOT}/app-info-%d{yyyy-MM-dd}-%i.log"</code> <code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>LevelRangeFilter</code> <code>minLevel</code><code>=</code><code>"INFO"</code> <code>maxLevel</code><code>=</code><code>"INFO"</code> <code>onMatch</code><code>=</code><code>"ACCEPT"</code> <code>onMismatch</code><code>=</code><code>"DENY"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>PatternLayout</code> <code>pattern</code><code>=</code><code>"${LOG_PATTERN}"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>SizeBasedTriggeringPolicy</code> <code>size</code><code>=</code><code>"19500KB"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>DefaultRolloverStrategy</code> <code>max</code><code>=</code><code>"10"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>RollingFile</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>RollingFile</code> <code>name</code><code>=</code><code>"errorLog"</code> <code>fileName</code><code>=</code><code>"${APP_LOG_ROOT}/app-error.log"</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>filePattern</code><code>=</code><code>"${APP_LOG_ROOT}/app-error-%d{yyyy-MM-dd}-%i.log"</code> <code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>LevelRangeFilter</code> <code>minLevel</code><code>=</code><code>"ERROR"</code> <code>maxLevel</code><code>=</code><code>"ERROR"</code> <code>onMatch</code><code>=</code><code>"ACCEPT"</code> <code>onMismatch</code><code>=</code><code>"DENY"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>PatternLayout</code> <code>pattern</code><code>=</code><code>"${LOG_PATTERN}"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>SizeBasedTriggeringPolicy</code> <code>size</code><code>=</code><code>"19500KB"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>DefaultRolloverStrategy</code> <code>max</code><code>=</code><code>"10"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>RollingFile</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>RollingFile</code> <code>name</code><code>=</code><code>"perfLog"</code> <code>fileName</code><code>=</code><code>"${APP_LOG_ROOT}/app-perf.log"</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>filePattern</code><code>=</code><code>"${APP_LOG_ROOT}/app-perf-%d{yyyy-MM-dd}-%i.log"</code> <code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>PatternLayout</code> <code>pattern</code><code>=</code><code>"${LOG_PATTERN}"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>SizeBasedTriggeringPolicy</code> <code>size</code><code>=</code><code>"19500KB"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>DefaultRolloverStrategy</code> <code>max</code><code>=</code><code>"1"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>RollingFile</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>RollingFile</code> <code>name</code><code>=</code><code>"traceLog"</code> <code>fileName</code><code>=</code><code>"${APP_LOG_ROOT}/app-trace.log"</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>filePattern</code><code>=</code><code>"${APP_LOG_ROOT}/app-trace-%d{yyyy-MM-dd}-%i.log"</code> <code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>PatternLayout</code> <code>pattern</code><code>=</code><code>"${LOG_PATTERN}"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>SizeBasedTriggeringPolicy</code> <code>size</code><code>=</code><code>"19500KB"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Policies</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>DefaultRolloverStrategy</code> <code>max</code><code>=</code><code>"1"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>RollingFile</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Appenders</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;">&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Loggers</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Logger</code> <code>name</code><code>=</code><code>"com.howtodoinjava.app.somePackage"</code> <code>additivity</code><code>=</code><code>"false"</code> <code>level</code><code>=</code><code>"trace"</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"traceLog"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"Console"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Logger</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Logger</code> <code>name</code><code>=</code><code>"com.howtodoinjava.app"</code> <code>additivity</code><code>=</code><code>"false"</code> <code>level</code><code>=</code><code>"debug"</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"debugLog"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"infoLog"</code>&nbsp; <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"errorLog"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"Console"</code>&nbsp; <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Logger</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Logger</code> <code>name</code><code>=</code><code>"org.framework.package"</code> <code>additivity</code><code>=</code><code>"false"</code> <code>level</code><code>=</code><code>"info"</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"perfLog"</code> <code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"Console"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Logger</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>Root</code> <code>level</code><code>=</code><code>"warn"</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;</code><code>AppenderRef</code> <code>ref</code><code>=</code><code>"Console"</code><code>/&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Root</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;">&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>&lt;/</code><code>Loggers</code><code>&gt;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;">&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&lt;/</code><code>Configuration</code><code>&gt;</code></span></span></span></span> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

### **5. Log4j2.xml 文件位置** ###

您应该将其`log4j2.xml`放在应用程序的类路径中的任何位置。Log4j 将扫描所有类路径位置以找出此文件，然后加载它。

![Log4j2.xml 文件位置][Log4j2.xml]

Log4j2.xml 文件位置

### **6. 演示** ###

让我们编写一个 java 类并编写一些日志语句来验证日志是否也在控制台和日志文件中显示。它将不同的日志级别记录到不同的日志

<table> 
 <tbody> 
  <tr> 
   <td style="text-align:left;vertical-align:baseline;"> 
    <div style="margin-left:0;text-align:left;"> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>package</code> <code>com.howtodoinjava.log4j2.examples;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;">&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>import</code> <code>org.apache.logging.log4j.LogManager;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>import</code> <code>org.apache.logging.log4j.Logger;</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;">&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>public</code> <code>class</code> <code>Log4j2HelloWorldExample </code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>{ </code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>private</code> <code>static</code> <code>final</code> <code>Logger LOGGER = LogManager.getLogger(Log4j2HelloWorldExample.</code><code>class</code><code>.getName());</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>public</code> <code>static</code> <code>void</code> <code>main(String[] args) </code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>{ </code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>LOGGER.debug(</code><code>"Debug Message Logged !!!"</code><code>);</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>LOGGER.info(</code><code>"Info Message Logged !!!"</code><code>);</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code>LOGGER.error(</code><code>"Error Message Logged !!!"</code><code>, </code><code>new</code> <code>NullPointerException(</code><code>"NullError"</code><code>));</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>&nbsp;&nbsp;&nbsp;&nbsp;</code><code>}</code></span></span></span></span> 
     </div> 
     <div style="margin-left:0;text-align:left;"> 
      <span style="color:#444444;"><span style="background-color:#ffffff;"><span style="background-color:#2e3440;"><span style="background-color:#ededed;"><code>}</code></span></span></span></span> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

现在，当您运行上述程序时，您将在控制台中获得以下日志。

[DEBUG] 2016-06-16 12:17:42.972 [main] Log4j2HelloWorldExample - 记录调试消息！！！
    [INFO] 2016-06-16 12:17:42.996 [main] Log4j2HelloWorldExample - 信息消息记录！！！
    [错误] 2016-06-16 12:17:42.997 [main] Log4j2HelloWorldExample - 记录错误信息！！！
    java.lang.NullPointerException: NullError
        在 com.howtodoinjava.log4j2.examples.Log4j2HelloWorldExample.main(Log4j2HelloWorldExample.java:14) [classes/:?]

如果更改系统的日期和再次运行应用程序，你会发现在配置位置即两个日志文件`app-info.log`和`app-info-2016-06-15.log`\-在第二个文件是翻了个身文件。

[Apache Log4j2]: https://logging.apache.org/log4j/2.x/
[Java 8 lambda]: https://howtodoinjava.com/java8/lambda-expressions/
[Log4j2.xml]: https://img-blog.csdnimg.cn/img_convert/a07bf3b94d1c596ad3468a1b03916106.png