大家帮帮忙看看，为什么读取的文件路径是错误的？

Question

小弟写的关于java读取配置文件的方法，一种是采用类装载器，一种是下面的方法，但是类装载器，读取的文件内容没有问题，不知道为什么下面的这中方式读取的问价路径不正确，希望大侠帮忙看看！public void delete(){
try {
String path = UserDao.class.getClassLoader().getResource("db.properties").getPath();  
System.out.println("文件的路径为："+path);
 FileInputStream in = new FileInputStream(path);  
Properties prop=new Properties();

prop.load(in);

    
    String url=prop.getProperty("url");
    String username=prop.getProperty("username");
    String passwd=prop.getProperty("passwd");
    System.out.println("------这是通过传统方式获取的配置文件----------");
    System.out.println("url==："+url+"  用户名="+username+"   密码="+passwd);
} catch (Exception e) {
e.printStackTrace();
}
    
}
这是异常代码：
文件的路径为：/D:/Program%20Files/Apache%20Software%20Foundation/Tomcat%205.5/webapps/Servlet/WEB-INF/classes/db.properties
java.io.FileNotFoundException: D:\Program%20Files\Apache%20Software%20Foundation\Tomcat%205.5\webapps\Servlet\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:138)
at java.io.FileInputStream.<init>(FileInputStream.java:97)
at com.java.test.UserDao.delete(UserDao.java:40)
at com.servlet.test.ServletContextCommuncation.doGet(ServletContextCommuncation.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:722)

Answer 1

字符串直接替换
replace方法String s = "D:\\Program%20Files\\Apache%20Software%20Foundation\\Tomcat%205.5\\webapps\\Servlet\\WEB-INF\\classes\\db.properties";
s = s.replace("%20", " ");
System.out.println(s);

Answer 2

文件的路径为：/D:/Program%20Files/Apache%20Software%20Foundation/Tomcat%205.5/webapps/Servlet/WEB-INF/classes/db.properties 路徑有中文和空格，你要轉義

Answer 3

补充下，输出结果为
D:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\Servlet\WEB-INF\classes\db.properties

Answer 4

我的也不行
java.lang.NullPointerException
at connectFactory.ConnectFactory.<clinit>(ConnectFactory.java:20)一样的方法  就是不知道哪里错了  求高手指教