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Servlet(三)HttpServlet

2024-08-02 05:19:22   220人阅读

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=http://www.mamicode.com/"登录">>6.浏览器访问http://localhost:8080/myweb/login.html,填写用户名登陆则可看到
doPosthunhun




Servlet(三)HttpServlet


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