JAVA 获取路径

public class FileTest {
   public static void main(String[] args) {
    System.out.println(Thread.currentThread().getContextClassLoader().getResource(""));
    System.out.println(FileTest.class.getClassLoader().getResource(""));
    System.out.println(ClassLoader.getSystemResource(""));
    System.out.println(FileTest.class.getResource(""));
    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"));
    }
}
WEB项目时JAVA文件中取得CLASSPATH路径

Thread.currentThread().getContextClassLoader().getResource("").getPath()

SERVLET/STRUTS中

获取WEB根目录
this.getServletContext().getRealPath("/")