编写Servlet，验证用户登录，如果用户名与密码都为“admin”则验证通过，跳转欢迎页面，否则弹出提示信息“用户名或密码错误
java代码:(Test1)
package com.test;
import java.io.IOException;
import java.io.PrintWriter;
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(urlPatterns={"/Test1"})
public class test1 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO 自动生成的方法存根
req.setCharacterEncoding("gbk");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String user=req.getParameter("user");
String pass = req.getParameter("pwd");
if(user.equals("admin")&&pass.equals("admin")){
out.println("欢迎登陆");
}else{
out.println("<script language='javascript'>alert('用户名或密码错误，请重新输入！')</script>");
out.println("<script language='javascript'>window.location.href='/Servlet_work/Html1.html'</script>");
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO 自动生成的方法存根
doGet(req, resp);
}
} html代码:(html1)
<!DOCTYPE html>
<html>
<head>
<title>Html1.html</title>
<meta name="keywords" content="keyword1,keyword2,keyword3">
<meta name="description" content="this is my page">
<meta name="content-type" content="text/html; charset=utf-8">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
<style>
#home {
width: 300px;
height: 300px;
margin: auto;
}
.dl1{
clear: both;
}
.dl1 dt{
float: left;
}
.dd1 dd{
float: left;
}
h1{
text-align: center;
}
#foot{
text-align: center;
}
</style>
</head>
<body>
<div id="home">
<h1>用户登陆</h1>
<form action="Test1" method="post">
<dl class="dl1">
<dt>用户账号:</dt>
<dd><input type="text" name="user" /></dd>
</dl>
<dl class="dl1">
<dt>用户密码:</dt>
<dd><input type="passWord" name="pwd" /></dd>
</dl>
<div id="foot">
<input type="submit" value="登陆"/>
</div>
</form>
</div>
</body>
</html> 运行截图:
备注:
在Servlet中实现页面中弹窗:
PrintWriter out = resp.getWriter();
out.println("<script language='javascript'>alert('用户名或密码错误，请重新输入！')</script>"); 在Servlet中实现页面的跳转:
out.println("<script language='javascript'>window.location.href='/Servlet_work/Html1.html'</script>");