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

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

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......../testpath
RequestURI......../testpath/Test/TestServlet
RequestURL........http://localhost:8080/testpath/Test/TestServlet
ServletPath......../Test/TestServlet