初始Ajax学习笔记

前端：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <!--引入jquery文件-->
    <script src="js/jquery-3.2.1.js" type="text/javascript"></script>
</head>
<body>
    <div style="margin:100px;height:100px">
        <input>
    </div>
    <script type="text/javascript">
    
        $("input:eq(0)").on('change',function(){
            //获取input中的值
            var a = $(this).val();
            
            var user = {"name":a,
                        "age": 18,
                        "tel": "13611111111"
            };
            //将这个值传递到java后台
            $.ajax({                                //通过jquery调用ajax方法，触发ajax请求
                url:'/web10/testAjax1',                //url表示请求会发送到哪个后端地址
                //data:'value='+a,                    //通过data封装参数
                data: user,//通过对象传参
                type:'get',                            //type表示发送到后端的请求类型：Get、Post、Put、Delete等等
                dataType:'text',                    //dataType表示服务端响应数据的类型：HTML、text、json等
                success:function(msg){                //success表示请求发送成功之后的回调函数
                                                    //msg表示服务端发送到前端的数据
                    alert(msg);
                },
                error:function(){                     //error,表示程序调用有误
                    alert('错误');
                }
            });    
        });
            
    </script>
    
</body>
</html>

后台：

package com.zzb.servlet;

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("/testAjax1")
public class TestAjax1 extends HttpServlet{

    private static final long serialVersionUID = 3377241767636882169L;

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String name = request.getParameter("name");
        String age = request.getParameter("age");
        String tel = request.getParameter("tel");
        
        System.out.println("ajaxÇëÇóµ½´ï:"+name+":"+age+":"+tel);
        
        PrintWriter out = response.getWriter();
        
        out.write("success:"+name);
        
        out.close();
    }

    
}

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