java中获取文件或文件夹的路径方

Posted 2021-02-16

如：

 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);

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%20SettingsAdministratorworkspaceprojectNameincom	est

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 SettingsAdministratorworkspaceprojectName

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 SettingsAdministratorworkspaceprojectName

获取当前工程路径第五种：System.out.println( System.getProperty("java.class.path"));
结果：C:Documents and SettingsAdministratorworkspaceprojectNamein
获取当前工程路径