JSON技巧篇

雨点打透心脏的1/2处 2022-06-16 07:55 110阅读 0赞

**JSONObject.getBooleanValue("key")优势使用**

import com.alibaba.fastjson.JSONObject;
    
    public class JsonObjectTest {
        public static void main(String [] args){
            JSONObject jsonObject= new JSONObject();
            jsonObject.put("x",true);
            jsonObject.put("y",false);
            jsonObject.put("x1","true");
            jsonObject.put("y1","false");
            jsonObject.put("z",null);
            jsonObject.put("z1","");
            System.out.println(jsonObject.getBoolean("z"));//null
            System.out.println(jsonObject.getBoolean("z1"));//null
            System.out.println(jsonObject.getBooleanValue("z"));//false
            System.out.println(jsonObject.getBooleanValue("z1"));//false
            System.out.println(jsonObject.getBooleanValue("noExistsKey"));//false
            
        }
    }

JSON多层解析示例
    package iuap.iform.esn.service;
    
    import com.google.gson.Gson;
    import iuap.iform.esn.util.MapUtil;
    import net.sf.json.JSONObject;
    
    import java.util.Map;
    
    /**
     * Created by Administrator on 2017/5/9.
     */
    public class TestJson {
        public static void main(String [] args){
            String respText="{\n" +
                    "  \"code\" : 0,\n" +
                    "  \"msg\" : \"查询事件成功\",\n" +
                    "  \"data\" : {\n" +
                    "    \"callBackTag\" : \"user_add_org,user_modify_org,user_leave_org,org_admin_add,org_admin_remove,org_dept_create,org_dept_modify,org_dept_remove,org_remove,org_group_add,org_group_modify,org_group_remove\",\n" +
                    "    \"callBackUrl\" : \"https://bpm.test.com/iform_web/esn/sync/event\"\n" +
                    "  }\n" +
                    "}";
            Map<String,Object> map = MapUtil.jsonToMap(respText);
            Map<String,Object> data = (Map<String, Object>)map.get("data");
            System.out.println(data.get("callBackTag").toString());
    
            //System.out.println(data);
    
            System.out.println("打印第一层map");
            showMap(map);
            Map<String,Object> dataMap=(Map<String, Object>) map.get("data");
            System.out.println("打印第二层map");
            System.out.println(dataMap.get("callBackTag").toString());
    
            String callBackTag=parseJson(respText,"callBackUrl");
            System.out.println(callBackTag);
    
        }
        public static String parseJson(String str,String tag){
            JSONObject jObj = JSONObject.fromObject(str);
            Object obj=jObj.getJSONObject("data");
            Gson gson=new Gson();
            Map map=gson.fromJson(obj.toString(), Map.class);
            String strV=(String) map.get(tag);
            return strV;
        }
        /***
         *
         * @param map 需要打印的Map结构
         */
        public static void showMap(Map<String,Object> map){
            for(Map.Entry<String,Object> kv:map.entrySet()){
                System.out.println(kv.getKey()+"  "+kv.getValue());
            }
        }
    }