request.getContextPath()、request.getRequestURI()、request.getRequestURI()、getServletPath()

区别：

• request.getContextPath()：得到项目的名字，即当前应用的根目录。
• request.getRequestURI()：返回相对路径
• request.getRequestURL()：返回绝对路径
• request.getServletPath()：返回Servlet所对应的url-pattern

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写一个最简单的Servlet：TestServlet.java

    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String ContextPath = request.getContextPath();        System.out.println("ContextPath........"+ContextPath);        String RequestURI = request.getRequestURI();        System.out.println("RequestURI........"+RequestURI);        StringBuffer RequestURL = request.getRequestURL();        System.out.println("RequestURL........"+RequestURL);        String ServletPath = request.getServletPath();        System.out.println("ServletPath........"+ServletPath);    }

web.xml中的配置如下；

  <servlet>    <servlet-name>TestServlet</servlet-name>    <servlet-class>test.TestServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>TestServlet</servlet-name>    <url-pattern>/Test/TestServlet</url-pattern>  </servlet-mapping>

在地址栏里输入URL为：

http://localhost:8080/testpath/Test/TestServlet

输出结果为：

其中，testpath为项目名。

ContextPath......../testpathRequestURI......../testpath/Test/TestServletRequestURL........http://localhost:8080/testpath/Test/TestServletServletPath......../Test/TestServlet