log4j--动态打印日志文件到指定文件夹

傷城~ 2024-03-17 21:49 89阅读 0赞

#### 文章目录 ####

*  log4j--动态打印日志文件到指定文件夹
 *   *   *  1、添加Maven依赖
         *  2、配置文件 log4j.properties
         *  3、编写日志打印工具类 LogUtil
         *  4、工具类调用

## log4j–动态打印日志文件到指定文件夹 ##

#### 1、添加Maven依赖 ####

<dependency>
    			<groupId>org.slf4j</groupId>
    			<artifactId>slf4j-api</artifactId>
    			<version>1.7.21</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.slf4j</groupId>
    			<artifactId>slf4j-log4j12</artifactId>
    			<version>1.7.21</version>
    		</dependency>

#### 2、配置文件 log4j.properties ####

log4j.rootLogger = debug,stdout,file
    
    ### 输出到控制台 ###
    log4j.appender.stdout = org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.Target = System.out
    log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern =  %d{ABSOLUTE} %5p %c{1}:%L - %m%n
    
    ### 输出到日志文件 ###
    log4j.appender.file = org.apache.log4j.DailyRollingFileAppender
    
    ###设置DatePattern，当天日志保存到log.log文件，前一天的日志文件名将被修改为log.log + _yyyy-MM-dd.log
    log4j.appender.file.File =D/logs/log.log
    log4j.appender.file.DatePattern = '_'yyyy-MM-dd'.log'
    log4j.appender.file.Append = true
    
    ## 输出DEBUG级别以上的日志
    log4j.appender.file.Threshold = DEBUG
    log4j.appender.file.layout = org.apache.log4j.PatternLayout
    log4j.appender.file.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

#### 3、编写日志打印工具类 LogUtil ####

package com.example.loginfo;
    
    
    import org.apache.log4j.DailyRollingFileAppender;
    import org.apache.log4j.Level;
    import org.apache.log4j.Logger;
    import org.apache.log4j.PatternLayout;
    
    import java.io.File;
    
    
    public class LogUtil {
        
    
        private static Logger logger;
        private static String filepath;
    
        public static void setLog(String path) {
              //path:日志保存路径
            filepath = path;
            new File(filepath).mkdir();  //创建文件夹
        }
    
        public static void infoMsg(String filename, String msg) {
               //filename:生成日志的文件名  msg:日志信息
            logger = Logger.getLogger("_" + filename);
            DailyRollingFileAppender appender = new DailyRollingFileAppender();
            appender.setFile(filepath + "/" + filename + ".log");
            appender.setDatePattern("'.'yyyy-MM-dd");
            PatternLayout layout = new PatternLayout("%-4r %-5p %d{yyyy-MM-dd HH:mm:ssS}%c %m%n");
            appender.setLayout(layout);
            appender.setAppend(true);
            appender.activateOptions();
            logger.addAppender(appender);
            logger.setAdditivity(false);
            logger.setLevel(Level.INFO);
            logger.info(msg);
            appender.close();
        }
    
        public Logger getLogger() {
        
            return logger;
        }
    }

#### 4、工具类调用 ####

package com.example.loginfo;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.ArrayList;
    import java.util.List;
    
    @RestController
    public class LogController {
        
        
        Logger logger = LoggerFactory.getLogger(LogController.class);
    
        @GetMapping(value = "/log")
        public void testLog() {
        
            LogUtil.setLog("E:\\home\\cuiyudong");
            List<Object> objects = new ArrayList<>();
            objects.add("FHIUFWIEU");
            objects.add("DASD");
            objects.add("FHIUCASFFGFWIEU");
    
            LogUtil.infoMsg("LogController日至信息：",objects.toString());
        }
    }

测试结果：

![在这里插入图片描述][9afb199dfe3d44c6bcb707774bf45dfc.png]

[9afb199dfe3d44c6bcb707774bf45dfc.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/39c5621308c445de9af2b538c8a78a81.png