ERROR - E:\Apache%20Software%20Foundation\.....\db.properties (系统找不到指定的路径。)

今天药忘吃喽~ 2022-06-07 03:45 628阅读 0赞

### 报错信息 ###

ERROR - E:\Apache%20Software%20Foundation\apache-tomcat-6.0.18\webapps\BookShop\WEB-INF\classes\db.properties (系统找不到指定的路径。)
    java.io.FileNotFoundException: E:\Apache%20Software%20Foundation\apache-tomcat-6.0.18\webapps\BookShop\WEB-INF\classes\db.properties (系统找不到指定的路径。)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:146)
        at com.icss.util.DbInfo.init(DbInfo.java:28)
        at com.icss.util.DbInfo.instance(DbInfo.java:19)
        at com.icss.dao.BaseDao.openConnection(BaseDao.java:29)
        at com.icss.dao.UserDao.login(UserDao.java:13)
        at com.icss.biz.UserBiz.login(UserBiz.java:14)
        at com.icss.control.LoginSvl.doPost(LoginSvl.java:43)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:744)

### 出现错误的原因 ###

Tomact安装目录中有空格，使用反射获取db.properties文件目录时，空格被‘%20’取代，无法找到正确位置  
URL对空格，特殊字符和中文进行了编码处理  
  
**出错的代码**

Properties prop = new Properties();
    String path = DbInfo.class.getResource("/").getPath() + "db.properties"; 
    prop.load(new FileInputStream(new File(path)));

### 解决方法 ###

将URL转成URI。*URI 是统一资源标识符，而 URL 是统一资源定位符。因此，笼统地说，每个 URL 都是 URI，但不一定每个 URI 都是 URL。（摘自JDK API）*

Properties prop = new Properties();
    String path = DbInfo.class.getResource("/").toURI().getPath() + "db.properties"; 
    prop.load(new FileInputStream(new File(path)));

更多详细解释：[http://www.360doc.com/content/11/1009/17/4602013\_154657565.shtml][http_www.360doc.com_content_11_1009_17_4602013_154657565.shtml]

[http_www.360doc.com_content_11_1009_17_4602013_154657565.shtml]: http://www.360doc.com/content/11/1009/17/4602013_154657565.shtml