Servlet登录验证
Servlet用户名及密码验证
实验结果
代码
FakeLogin.java
package com.fakelogin.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class FakeLogin extends HttpServlet {
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String userName = request.getParameter("userid");
String userPwd = request.getParameter("passwd");
System.out.println("userName"+userName);
System.out.println("userPwd"+userPwd);
String info = "";
if(("tom".equals(userName))&&"123".equals(userPwd))
//if(userName == "tom" && userPwd == "123")
{
info = "用户"+userName+"的密码是"+userPwd;
}else{
info = "用户名或密码不正确！";
}
request.setAttribute("outputMessage", info);
request.getRequestDispatcher("./"+"NewFile.jsp").forward(request,response);
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd">
<welcome-file-list>
<welcome-file> login.jsp </welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>FakeLogin</servlet-name>
<servlet-class>com.fakelogin.servlet.FakeLogin</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FakeLogin</servlet-name>
<url-pattern>/FakeLogin</url-pattern>
</servlet-mapping>
</web-app>
login.jsp
<%@ page language="java" contentType="text/html; charset=gb2312"
%>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="css/style.css">
<title>FAKE NEWS</title>
</head>
<body>
<div class="logform">
<label class="title"for="AAAA">帐号登录</label>
<form class="loginform" id="aaa" action="FakeLogin" method="post">
<input class="inputbox" type="text" id="userid" name="userid" placeholder="用户名">
<input class="inputbox" type="password" id="passwd" name="passwd" placeholder="密码">
<input class="submit" type="submit" name="submit" value="登陆">
</form>
</div>
</body>
</html>
NewFile.jsp
<%@ page language="java" contentType="text/html; charset=gb2312"
%>
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<%=request.getAttribute("outputMessage") %>
<p> end </p>
</body>
</html>
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