【servlet】登录验证
Check.java写业务逻辑，login.jsp写登录界面，welcome.jsp写欢迎界面
Check.java
package com.yan.servlet;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/check")
public class Check extends HttpServlet {
private static final long serialVersionUID = 1L;
public Check() {
super();
}
public void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String u = request.getParameter("username");
String p = request.getParameter("passwd");
request.setAttribute("username", u);
request.setAttribute("passwd", p);
if (u.equals("1") && p.equals("1")) {
request.getRequestDispatcher("/jsp/welcome.jsp").forward(request, response);
} else {
request.getRequestDispatcher("/jsp/login.jsp").forward(request, response);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
process(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
process(request, response);
}
}
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>Please input below</h1>
<form action="/TestPro/check" method="post">
username: <input type="text" name="username"><br/><br/>
password: <input type="password" name="passwd"><br/><br/>
<input type="submit" value="submit" >
<div>
<h4>刚刚输入的用户名是：</h4>${username}
<h4>刚刚输入的密码是：</h4>${passwd}
</div>
</form>
</body>
</html>
welcome.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>hello</h1>
<div>
<h1>你的用户名是${username },密码是${passwd }</h1>
</div>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>TestPro</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>