java获取当前路径

第一种： 
File f = new File(this.getClass().getResource("/").getPath()); 
System.out.println(f); 
结果: 
C:\Documents%20and%20Settings\Administrator\workspace\projectName\bin 
获取当前类的所在工程路径; 
如果不加“/” 
File f = new File(this.getClass().getResource("").getPath()); 
System.out.println(f); 
结果： 
C:\Documents%20and%20Settings\Administrator\workspace\projectName\bin\com\test 
获取当前类的绝对路径； 

第二种： 
File directory = new File("");//参数为空 
String courseFile = directory.getCanonicalPath() ; 
System.out.println(courseFile); 
结果： 
C:\Documents and Settings\Administrator\workspace\projectName 
获取当前类的所在工程路径; 

第三种： 
URL xmlpath = this.getClass().getClassLoader().getResource("selected.txt"); 
System.out.println(xmlpath); 
结果： 
file:/C:/Documents%20and%20Settings/Administrator/workspace/projectName/bin/selected.txt 
获取当前工程src目录下selected.txt文件的路径 

第四种： 
System.out.println(System.getProperty("user.dir")); 
结果： 
C:\Documents and Settings\Administrator\workspace\projectName 
获取当前工程路径 

第五种： 
System.out.println( System.getProperty("java.class.path")); 
结果： 
C:\Documents and Settings\Administrator\workspace\projectName\bin 
获取当前工程路径