WebServlet的简单用法

最新推荐文章于 2025-06-25 14:41:28 发布

Mrs Wang

最新推荐文章于 2025-06-25 14:41:28 发布

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分类专栏： Java

本文链接：https://blog.youkuaiyun.com/weixin_40188140/article/details/80618518

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本文介绍了一个简单的登录页面设计，包括HTML结构、JavaScript交互及后端处理流程。演示了通过Ajax进行用户验证的过程，并根据验证结果改变页面内容或跳转到其他网站。

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index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录页面</title>
<script type="text/javascript">
  
</script>
</head>
<body>
  <div>
    <button onclick="Login();">登录</button>
  </div>
  <div>
    <textarea id="content" rows="15" cols="45">333</textarea>
  </div>
  <script src="./js/jquery.min.js"></script>
  <script src="./js/login.js"></script>
</body>
</html>

function Login(){
	var url="./getUserInfo";
	var param="username="+"22";
	$.ajax({
		type:'post',
		url:url,
		date:param,
		cache:false,
		dateType:'json',
		success:function(date){
			var date = eval('('+date+')');
			if(date["age"]=="22"){
				document.getElementById("content").innerHTML="Have a nice day!";
				//window.location.href="http://www.baidu.com";
			}else{
				window.location.href="http://www.baidu.com";
			}
		},
	    error:function(date){
	    	alert("服务器故障");
	    }
	});
}

getUserInfo.java

package com.wjh.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;

/**
 * Servlet implementation class get
 */
@WebServlet("/getUserInfo")
public class getUserInfo extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public getUserInfo() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @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);
		response.setContentType("text/html;charset=UTF-8");
		request.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();
		String username=request.getParameter("username");
		System.out.println("测试");
		String json="{\"name\":\""+username+"\",\"age\":\"22\",\"sex\":\"女\"}";
		out.print(json);
		return;
	}

}

执行效果：