IDEA开发Servlet跳转后页面空白，求解！~~

u010817365 2016-07-31 05:49:08

Tomcat7和8都试过，一样的结果。请问是哪里写错了。
index.jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

  <head>

    <title>title</title>

  </head>

  <body>

  <a href="ServletFirst">servlet</a>

  </body>

</html>

ServletFirst:

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.io.PrintWriter;



public class ServletFirst extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        System.out.println("success");

        PrintWriter ou = response.getWriter();

        ou.print("222");

    }



    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

}

下面是web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

         version="3.1">

    <servlet>

        <servlet-name>ServletFirst</servlet-name>

        <servlet-class>ServletFirst</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>ServletFirst</servlet-name>

        <url-pattern>/ServletFirst</url-pattern>

    </servlet-mapping>

</web-app>