servlet搭建

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1 前端页面

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>登录</title>

<meta http-equiv="content-type" content="text/html; charset=UTF-8">

</head>

<body>
<form action="http://localhost:8080/loginServlet/login" method="post" accept-charset="utf-8">
用户：<input type="text" name="username" /><br>
密码：<input type="password" name="password" /><br>
<input type="submit" value="登录" />

</form>
</body>
</html>

2 映射关系

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>LoginServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>

3 action处理

//引入所需要的包
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class LoginServlet extends HttpServlet {
//重写doGet方法
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException,
IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");

PrintWriter out=response.getWriter();
out.println(username);

System.out.println(username);
}
//重写doPost方法
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException,
IOException {
doGet(request, response);
}
}

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