springboot json和bean和JSONObject，JSONArray的转换

一 操作说明

1.1 说明

本案例操作说明，json，bean，相互之间转换成JSONObject，jsonarray。

pom依赖的配置

    
    
      com.alibaba
      fastjson
      1.2.28
    

1.2 实施操作

1.2.1 定义初始javabean

1.Apple类

public class Apple {
    private String id;
    private String pName;
    private  String price;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getpName() {
        return pName;
    }

    public void setpName(String pName) {
        this.pName = pName;
    }

    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price;
    }
}

2.city类

public class City {
    private int id;
    private String cName;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getcName() {
        return cName;
    }

    public void setcName(String cName) {
        this.cName = cName;
    }
}

3.province类

public class Province {
    private int  id;
    private String pName;
    private List cityList;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getpName() {
        return pName;
    }

    public void setpName(String pName) {
        this.pName = pName;
    }

    public List getCityList() {
        return cityList;
    }

    public void setCityList(List cityList) {
        this.cityList = cityList;
    }
}

1.2.2 bean和jsonobject，json串

    public static void  jsonObjectInfo(){
        Apple apple=new Apple();
        apple.setId("24444");
        apple.setpName("pingguo234");
        apple.setPrice("345.69");
        Gson gson =new Gson();
      String gjson=  gson.toJson(apple);
        System.out.println("gson:"+gjson);
        //1. 实体变json串
      String tojson=  JSONObject.toJSON(apple)+"";
      System.out.println("tojson:"+tojson);
        //2. json串变JSONObject
        JSONObject appleJsonObject= JSONObject.parseObject(gjson);
        String id=appleJsonObject.get("id")+"";
        String name=appleJsonObject.getString("pName");
        System.out.println("id:"+id+" name: "+name);
    }

调用结果：

 1.2.3  bean和jsonobjectArray

1.代码

    public static void  jsonArrayInfo(){
       Province provice=new Province();
       provice.setId(11);
       provice.setpName("北京");
       List cityList1=new ArrayList<>();
       City city=new City();
       city.setId(11);
       city.setcName("朝阳");
       cityList1.add(city);
        City city2=new City();
        city2.setId(12);
        city2.setcName("海淀");
        cityList1.add(city2);
        City city3=new City();
        city3.setId(13);
        city3.setcName("西城");
        cityList1.add(city3);
       provice.setCityList(cityList1);
       //1.实体转json
        String str = JSONObject.toJSON(provice).toString();
        System.out.println("str: "+str);
       //2.json 转 json array
        JSONObject appObj= JSONObject.parseObject(str);
        String name=appObj.getString("pName");
        System.out.println("pName:"+name);
        //3.获取JSONObject对象中的JSONArray数组
       JSONArray arrayList= appObj.getJSONArray("cityList");
       for(Object obj:arrayList){
           JSONObject jsonObject=(JSONObject)obj;
           String cname=jsonObject.get("cName")+"";
           System.out.println("cname:"+cname);
       }

    }

2.结果