JSON中toJSONString、ParseObject、parseArray的作用以及用 com.alibaba.fast.JSONArray解析字符串或者List集合

 if(scenicInfo.getKindsImage() != null){
List<String> imageUrl = JSONArray.parseArray(scenicInfo.getKindsImage(),String.class);
scenicInfo.setKindsImage(imageUrl.get(0));
}

（1）parseArray的作用

import com.alibaba.fastjson.JSON;
import lombok.Data;
import org.junit.Test;

import java.util.List;

public class JSONTest {
    @Test
    public void JSONTest() {
        //从Redis中查出来的字符串
        String str = "[{\"ct_pt\":\"xxx\",\"data_time\":\"xxx\",\"mp_id\":" +
                "\"xxx\",\"mp_name\":\"xxx\",\"pos_p_e_total_e\":\"xxx\",\"" +
                "pos_p_e_total_s\":\"xxx\",\"pos_p_e_total_sub\":\"xxx\"," +
                "\"pos_p_e_total_subQuantity\":\"xxx\"}]";
        //将字符串转换成list
        List<Emp> parseArray = JSON.parseArray(str, Emp.class);
        for (Emp emp : parseArray){
            System.out.println(emp);
        }
    }

}

@Data
class Emp {
    private String ct_pt;
    private String data_time;
    private String mp_id;
    private String mp_name;
    private String pos_p_e_total_e;
    private String pos_p_e_total_s;
    private String pos_p_e_total_sub;
    private String pos_p_e_total_subQuantity;
}

输出结果：


（2）toJSONString的作用

package com.navict.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.Data;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class JSONTest {
    @Test
    public void JSONTest() {
        List<Emp> list = new ArrayList<>();

        Emp emp = new Emp();
        emp.setCt_pt("1");
        emp.setData_time(new Date());
        emp.setMp_id("1");
        emp.setMp_name("李四");
        emp.setPos_p_e_total_e("1");
        list.add(emp);
        //将集合转换成字符串
        String str = JSON.toJSONString(list);
        System.out.println(str);
    }

}

@Data
class Emp {
    private String ct_pt;
    private Date data_time;
    private String mp_id;
    private String mp_name;
    private String pos_p_e_total_e;
}

 
   

运行结果

（3）ParseObject的作用

package com.navict.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.Data;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class JSONTest {
    @Test
    public void JSONTest() {
        String str = "{\"ct_pt\":\"xxx\",\"data_time\":\"xxx\",\"mp_id\":" +
                "\"xxx\",\"mp_name\":\"xxx\",\"pos_p_e_total_e\":\"xxx\",\"" +
                "pos_p_e_total_s\":\"xxx\",\"pos_p_e_total_sub\":\"xxx\"," +
                "\"pos_p_e_total_subQuantity\":\"xxx\"}";
        //将字符串转换成对象
        JSONObject jsonObject = JSONObject.parseObject(str);
        String ct_pt = (String)jsonObject.get("ct_pt");
        String mp_id = (String)jsonObject.get("ct_pt");
       // Date data_time =(Date) jsonObject.get("data_time");
        String mp_name = (String)jsonObject.get("mp_name");
        String pos_p_e_total_e = (String)jsonObject.get("pos_p_e_total_e");
        Emp testEmp = new Emp();
        testEmp.setMp_id(mp_id);
        testEmp.setPos_p_e_total_e(pos_p_e_total_e);
        testEmp.setMp_name(mp_name);
        //testEmp.setData_time(data_time);
        testEmp.setCt_pt(ct_pt);
        System.out.println(JSONObject.toJSON(testEmp));
        System.out.println(jsonObject.get("ct_pt"));
    }

}

@Data
class Emp {
    private String ct_pt;
    private Date data_time;
    private String mp_id;
    private String mp_name;
    private String pos_p_e_total_e;
}

 
   

（4） com.alibaba.fast.JSONArray的作用

package com.navict.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import lombok.Data;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class JSONTest {
    @Test
    public void JSONTest() {
        String str = "{\"ct_pt\":\"xxx\",\"data_time\":\"xxx\",\"mp_id\":" +
                "\"xxx\",\"mp_name\":\"xxx\",\"pos_p_e_total_e\":\"xxx\",\"" +
                "pos_p_e_total_s\":\"xxx\",\"pos_p_e_total_sub\":\"xxx\"," +
                "\"pos_p_e_total_subQuantity\":\"xxx\"}";
        //将字符串转换成对象
        Emp emp = JSONArray.parseObject(str, Emp.class);
        System.out.println(JSONObject.toJSONString(emp));
    }

}

@Data
class Emp {
    private String ct_pt;
    private Date data_time;
    private String mp_id;
    private String mp_name;
    private String pos_p_e_total_e;
}

   
运行结果：

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原文链接：https://blog.csdn.net/hukehukehukehuke/article/details/106198340