json字符串转Map

import java.lang.reflect.InvocationTargetException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.converters.BooleanConverter;
import org.apache.commons.beanutils.converters.DateConverter;
import org.apache.commons.beanutils.converters.DoubleConverter;
import org.apache.commons.beanutils.converters.IntegerConverter;
import org.apache.commons.beanutils.converters.LongConverter;

import com.iwhalecloud.retail.common.consts.CommonBaseMessageCodeEnum;
import com.iwhalecloud.retail.common.exception.BaseException;
import com.rabbitmq.tools.json.JSONReader;
import com.rabbitmq.tools.json.JSONWriter;

public abstract class JsonUtil {

    private static JSONWriter jsonWriter = new JSONWriter();
    private static JSONReader jsonReader = new JSONReader();

    public static String object2Json(Object object) {
        return jsonWriter.write(object);
    }

    /**
     * json字符串转Object对象
     * @param json
     * @return
     */
    public static Object json2Object(String json) {
        return jsonReader.read(json);
    }

    private JsonUtil() {

    }

    public static <T> T json2T(String json, Class<T> clazz) throws InvocationTargetException, IllegalAccessException, InstantiationException, BaseException {
        AssertUtil.isNotEmpty(json, CommonBaseMessageCodeEnum.REQ_PARAM_NOT_NULL);
        Map<String, Object> map = (HashMap<String, Object>) JsonUtil.json2Object(json);
        T t = clazz.newInstance();
        ConvertUtils.register(new DateConverter(), Date.class);
        ConvertUtils.register(new LongConverter(null), Long.class);
        ConvertUtils.register(new BooleanConverter(null), Boolean.class);
        ConvertUtils.register(new IntegerConverter(null), Integer.class);
        ConvertUtils.register(new DoubleConverter(null), Double.class);
        BeanUtils.populate(t, map);
        return t;
    }

}

使用方式：

Map<String, Object> map = (HashMap<String, Object>) JsonUtil.json2Object(jsonStr);

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
 
 
import org.apache.commons.lang.StringUtils;
import org.zgr.pack.entity.test.TestJsonToList;
 
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
 
 
public class Util {
        //json字符串转换为MAP
        public static Map jsonStrToMap(String s) {
            Map map = new HashMap();
            //注意这里JSONObject引入的是net.sf.json
            net.sf.json.JSONObject json = net.sf.json.JSONObject.fromObject(s);
            Iterator keys = json.keys();
            while (keys.hasNext()) {
                String key = (String) keys.next();
                String value = json.get(key).toString();
                if (value.startsWith("{") && value.endsWith("}")) {
                    map.put(key, jsonStrToMap(value));
                } else {
                    map.put(key, value);
                }
 
            }
            return map;
        }
        
        // 将jsonArray字符串转换成List集合
        public static List jsonToList(String json, Class beanClass) {
            if (!StringUtils.isBlank(json)) {
                //这里的JSONObject引入的是 com.alibaba.fastjson.JSONObject;
                return JSONObject.parseArray(json, beanClass);
            } else {
                return null;
            }
        }
        
        //List集合转换为json
        public static JSON listToJson(List list) {
            JSON json=(JSON) JSON.toJSON(list);
            return json;
        }
        
        
        public static void main(String[] args) {
            
            System.out.println("---------------------json字符串转换为MAP---------------------");
            JSONObject jsonObject=new JSONObject();
            jsonObject.put("abc", 123);
            jsonObject.put("def", 456);
            System.out.println("A==========json====="+jsonObject);
            Map map=Util.jsonStrToMap(jsonObject.toString());
            System.out.println("B==========def======"+map.get("def"));
            
            
            System.out.println("---------------------将jsonArray字符串转换成List集合---------------------");
            String str="[{"year":"2015","month":10,"count":47},{"year":2017,"month":12,"count":4}]";
            //这里需要指定泛型，我们建立一个实体类TestJsonToList
            List<TestJsonToList> list=Util.jsonToList(str, TestJsonToList.class);
            System.out.println("C==========取list第二个元素的year====="+list.get(1).getYear());
            
            
            System.out.println("---------------------将list集合转换成json---------------------");
            //这里的JSONObject引入的是 com.alibaba.fastjson.JSONObject;
            JSON json=Util.listToJson(list);
            System.out.println("D==========json====="+json);
        }
}