java项目中获得不同状态下的磁盘根目录和相对目录。

|------磁盘目录：

1.获得j2ee项目根目录WebRoot所在的磁盘位置
request.getRealPath("/")
如：D:\MyWork\humanmanage\WebRoot\

System.out.println(Thread.currentThread().getContextClassLoader().getResource(""));
System.out.println(test.class.getClassLoader().getResource(""));
System.out.println(ClassLoader.getSystemResource(""));
System.out.println(test.class.getResource(""));
System.out.println(test.class.getResource("/"));
System.out.println(new File("").getAbsolutePath());
System.out.println(System.getProperty("user.dir"));

输出结果：

file:/D:/MyWork/webcount/WebRoot/WEB-INF/classes/
file:/D:/MyWork/webcount/WebRoot/WEB-INF/classes/
file:/D:/MyWork/webcount/WebRoot/WEB-INF/classes/
file:/D:/MyWork/webcount/WebRoot/WEB-INF/classes/com/sinoMerica/count/
file:/D:/MyWork/webcount/WebRoot/WEB-INF/classes/
D:\MyWork\webcount
D:\MyWork\webcount

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|------相对目录：