Gson toJson()的使用

为了返回layui中table所需要的数据格式可以使用toJson函数。需要导入gson.jar

首先需要一个类来定义数据结构

package utils;

import Data.ArticleData;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class ToJsonCool {
    private String code;
    private String msg;
    private String count;
    private ArrayList<HashMap<String,String>> data;


    public String getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public String getCount() {
        return count;
    }

    public void setCount(String count) {
        this.count = count;
    }

    public ToJsonCool() {
    }

    public ToJsonCool(String code, String msg, String count, ArrayList<HashMap<String, String>> data) {
        this.code = code;
        this.msg = msg;
        this.count = count;
        this.data = data;
    }

    public ArrayList<HashMap<String, String>> getData() {
        return data;
    }

    public void setData(ArrayList<HashMap<String, String>> data) {
        this.data = data;
    }
}

listarticledata=new ArrayList<ArticleData>();
        listarticledata=articleDataDao.qrFindCheckSend();
        listMapJson=new ArrayList<HashMap<String,String>>();
        for(int i=0;i<listarticledata.size();i++){
            mapJson= new HashMap<String, String>();
            mapJson.put("a_id",listarticledata.get(i).getA_id());
            mapJson.put("a_title",listarticledata.get(i).getA_title());
            mapJson.put("a_key",listarticledata.get(i).getA_key());
            mapJson.put("a_time",listarticledata.get(i).getA_time());
            mapJson.put("a_man",listarticledata.get(i).getA_man());
            mapJson.put("a_main_text",listarticledata.get(i).getA_main_text());
            listMapJson.add(mapJson);
        }
        Gson gson=new Gson();
        String str=null;
        str=gson.toJson(listarticledata);
        toJsonCool=new ToJsonCool("0","",listarticledata.size()+"",listMapJson);
        str=gson.toJson(toJsonCool);

这样就可以转换为layui所需要的格式

1. {
2. "code": 0,
3. "msg": "",
4. "count": 1000,
5. "data": [{}, {}]
6. }