JAVA中寻找文件路径

public class FileTest {      
    public static void main(String[] args) throws Exception {      
        System.out.println(Thread.currentThread().getContextClassLoader().getResource("")); 
       System.out.println(FileTest.class.getClassLoader().getResource(""));      
     
       System.out.println(ClassLoader.getSystemResource(""));  
       
       //常用方法
       String s = FileTest.class.getResource("").toURI().getPath();
		String filePath = s.substring(1, s.length());
		
       System.out.println(FileTest.class.getResource("").toURI().getPath()); //实用     
       System.out.println(FileTest.class.getResource("/"));    
        //Class文件所在路径    
        System.out.println(new File("/").getAbsolutePath()+"##########");      
       System.out.println(System.getProperty("user.dir"));      
    }      
}