java中获取文件或文件夹的路径方

如:
java中获取文件或文件夹的路径方

 String a = "57java.txt";
        File f = new File(this.getClass().getResource("").getPath() + a);
        if (!f.exists()) {
            System.out.println("不存在");
        } else {
            Log.info(f+"");
        }
        System.out.println("获取当前类的所在工程路径; :"+f);

java中获取文件或文件夹的路径方

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