login.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>欢迎进入登陆页面！</h1>
<form action="LoginServlet" method="post">
<table>
<tr>
<td>用户名:</td>
<td><input type="text" name="user"></input></br></td>
</tr>
<tr>
<td>密码:</td>
<td><input type="password" name="pwd"></input></br></br></td>
</tr>
<tr>
<td>提交:</td>
<td><input type="submit"></input></td>
</tr>
</table>
</form>
</body>
</html>
loginServlet
package com.feisi;
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;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
@Override
public void init() throws ServletException {
// TODO Auto-generated method stub
super.init();
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//获取请求方式是GET,POST方式？
HttpServletRequest httpServletRequest=(HttpServletRequest) req;
String method=httpServletRequest.getMethod();
System.out.println(method);
if(method.contentEquals("GET")) {
doGet(req,resp);
}
if(method.equals("POST")) {
doPost(req,resp);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取请求参数：username，password
String username=request.getParameter("user");
String password=request.getParameter("pwd");
//2.获取请求参数
String initUser="123";
String initpassword="456";
response.setContentType("text/html;charset=UTF-8");
PrintWriter out=response.getWriter();
//3.对比
String sus ="登陆成功!";
String err = "登陆失败，请重新登录";
if(initUser.equals(username)&&initpassword.equals(password)){
out.print(sus+username); // 生成html内容
}else{
out.print(err); // 生成html内容
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
运行结果
