java转java 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="js/jquery-3.6.0.js"></script>
</head>
<script>
  function action(){
      $.ajax({
          url:"/ajax/logins",
        type:"get",
        dataType:"json",
        data:{"name":"李四", "age": 22},
        success:function (result){
           //后台响应的是一个Json格式的java字符串，jquery会自动将这个字符串转化为json格式的js对象，简称json对向
            console.log(result.code)
            console.log(result.meg)
            console.log(result.data.length)
            // console.log("")
            for (let i = 0; i < result.data.length; i++) {
                console.log(result.data[i].name)
                console.log(result.data[i].age)
            }
        },
        error:function (){
            alert("error")
        }
    });
  }
</script>
<body>
<p>
  <input type="button" value="ajax" onclick="action()">
</p>
<p>
    <input type="text" id="uu">
</p>
</body>
</html>

 

package com.zzc.servlet;

import com.fasterxml.jackson.databind.ObjectMapper;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

public class AjaxServlet1 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding( "utf-8" );
//        不能向ajax响应一个页面，所以text/html不可用application/json
        resp.setContentType( "application/json;charset=utf-8" );
        System.out.println(req.getParameter( "name" ));
        System.out.println(req.getParameter( "age" ));
//        System.out.println(req.getParameter( "sex" ));
        //jackson提供的api
        ObjectMapper mapper = new ObjectMapper();
        User user = new User("张三",88);
        User user2 = new User("王五",22);
        User user3= new User("王二麻子",38);
        User user4 = new User("朱青山岛",438);
        //将java对象转换成json格式的字符串
        ArrayList<User> users = new ArrayList<>();
        users.add( user );
        users.add( user2 );
        users.add( user3 );
        users.add( user4 );
        R r = new R();
        r.setCode( 200 );
        r.setMeg( "转换ok" );
        r.setData(users);
        String value = mapper.writeValueAsString( r );
        System.out.println( value );
        //不能向ajax响应一个页面
        PrintWriter out = resp.getWriter();
        out.write( value );
        out.close();

    }
}
package com.zzc.servlet;

public class User {
    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

}
package com.zzc.servlet;

import java.util.List;

public class R {
    private int code;
    private String meg;
    private List<User> data;

    @Override
    public String toString() {
        return "R{" +
                "code=" + code +
                ", meg='" + meg + '\'' +
                ", data=" + data +
                '}';
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMeg() {
        return meg;
    }

    public void setMeg(String meg) {
        this.meg = meg;
    }

    public List<User> getData() {
        return data;
    }

    public void setData(List<User> data) {
        this.data = data;
    }
}

 

posted @ 2022-02-24 13:45  ZikC  阅读(34)  评论(0)    收藏  举报