Servlet(三)HttpServlet

浏览数：31 / 时间：2015年06月09日

以HttpServlet创建Servlet

1、在FirstServlet同目录下建立HServlet.java

package com.hunhun;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class HServlet extends HttpServlet{
<span style="white-space:pre">	</span>protected void doGet(HttpServletRequest req,
                     HttpServletResponse resp)
              throws ServletException,
                     IOException{
         resp.getWriter().println("doGet"+req.getParameter("username"));


    }
    
    protected void doPost(HttpServletRequest req,
                      HttpServletResponse resp)
               throws ServletException,
                      IOException{
         resp.getWriter().println("doPost"+req.getParameter("username"));


    }
}

2、web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>




<web-app xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  version="3.0"
  metadata-complete="true">
    <servlet>
        <servlet-name>FirstServlet</servlet-name>
        <servlet-class>com.hunhun.FirstServlet</servlet-class>
    </servlet>


    <servlet-mapping>
        <servlet-name>FirstServlet</servlet-name>
        <url-pattern>/FirstServlet</url-pattern>
    </servlet-mapping>


    <servlet>
        <servlet-name>GServlet</servlet-name>
        <servlet-class>com.hunhun.GServlet</servlet-class>
    </servlet>


    <servlet-mapping>
        <servlet-name>GServlet</servlet-name>
        <url-pattern>/GServlet</url-pattern>
    </servlet-mapping>




    <servlet>
        <servlet-name>HServlet</servlet-name>
        <servlet-class>com.hunhun.HServlet</servlet-class>
    </servlet>


    <servlet-mapping>
        <servlet-name>HServlet</servlet-name>
        <url-pattern>/HServlet</url-pattern>
    </servlet-mapping>
</web-app>

3、编译文件，reload myweb项目，注意每次重新修改*Servlet.java文件,都需要重新编译，并重新加载 myweb项目或重启tomcat7

4、浏览器访问 http://localhost:8080/myweb/HServlet?username=hunhun，可看到

doGethunhun

5、在myweb目录下建立login.html文件

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>登录</title>
</head>
<body>
	<form action="/myweb/HServlet"  method="post">
		用户名：<input type="text" name="username">
		<input type="submit" value="登录">
	</form>
</body>
</html>

6.浏览器访问http://localhost:8080/myweb/login.html,填写用户名登陆则可看到