json转List、Map

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;

public class JsonUtil {
    /**
     * json字符串转化为数组
     * @param json
     * @return
     */
    public static List<Map<String, Object>> json2List(Object json) {  
        JSONArray jsonArr = (JSONArray) json;  
        List<Map<String, Object>> arrList = new ArrayList<Map<String, Object>>();  
        for (int i = 0; i < jsonArr.size(); ++i) {  
            arrList.add(strJson2Map(jsonArr.getString(i)));  
        }  
        return arrList;  
    }  
  
    /**
     * json字符串转化为Map
     * @param json
     * @return
     */
    public static Map<String, Object> strJson2Map(String json) {  
        JSONObject jsonObject = JSONObject.parseObject(json);  
        Map<String, Object> resMap = new HashMap<String, Object>();  
        Iterator<Entry<String, Object>> it = jsonObject.entrySet().iterator();  
        while (it.hasNext()) {  
            Map.Entry<String, Object> param = (Map.Entry<String, Object>) it.next();  
            if (param.getValue() instanceof JSONObject) {  
                resMap.put(param.getKey(), strJson2Map(param.getValue().toString()));  
            } else if (param.getValue() instanceof JSONArray) {  
                resMap.put(param.getKey(), json2List(param.getValue()));  
            } else {  
                resMap.put(param.getKey(), JSONObject.toJSONString(param.getValue(), SerializerFeature.WriteClassName));  
            }  
        }  
        return resMap;  
    }
}

json、List互转

package com.listandjson;
 
import java.util.ArrayList;
import java.util.List;
import net.sf.json.JSONArray;
 
public class Test {
     
    public static void main(String[] args) {
        List<String> list = new ArrayList<String>();
        list.add("abc");
        list.add("123");
         
        //list转成json
        String json =JSONArray.fromObject(list).toString();
        System.out.println(json);  
        //运行：["abc","123"]
         
        //json转成list
         JSONArray jsonArray = JSONArray.fromObject(json);
         List<String> list2 = (List) JSONArray.toCollection(jsonArray);
         for (int i = 0; i < list2.size(); i++) {
            System.out.println(list2.get(i));  
            //运行：abc
            //　　  123
        }
    }
}

jsonStr转Map

    package com.json;  
      
    import com.alibaba.fastjson.JSON;  
    import com.alibaba.fastjson.JSONObject;  
    import java.util.Map;  
      
    /** 
     * JSON字符串自动转换 
     * Created by zkn on 2016/8/22. 
     */  
    public class JsonToMapTest01 {  
      
        public static void main(String[] args){  
      
            String str = "{"0":"zhangsan","1":"lisi","2":"wangwu","3":"maliu"}";  
            //第一种方式  
            Map maps = (Map)JSON.parse(str);  
            System.out.println("这个是用JSON类来解析JSON字符串!!!");  
            for (Object map : maps.entrySet()){  
                System.out.println(((Map.Entry)map).getKey()+"     " + ((Map.Entry)map).getValue());  
            }  
            //第二种方式  
            Map mapTypes = JSON.parseObject(str);  
            System.out.println("这个是用JSON类的parseObject来解析JSON字符串!!!");  
            for (Object obj : mapTypes.keySet()){  
                System.out.println("key为："+obj+"值为："+mapTypes.get(obj));  
            }  
            //第三种方式  
            Map mapType = JSON.parseObject(str,Map.class);  
            System.out.println("这个是用JSON类,指定解析类型，来解析JSON字符串!!!");  
            for (Object obj : mapType.keySet()){  
                System.out.println("key为："+obj+"值为："+mapType.get(obj));  
            }  
            //第四种方式  
            /** 
             * JSONObject是Map接口的一个实现类 
             */  
            Map json = (Map) JSONObject.parse(str);  
            System.out.println("这个是用JSONObject类的parse方法来解析JSON字符串!!!");  
            for (Object map : json.entrySet()){  
                System.out.println(((Map.Entry)map).getKey()+"  "+((Map.Entry)map).getValue());  
            }  
            //第五种方式  
            /** 
             * JSONObject是Map接口的一个实现类 
             */  
            JSONObject jsonObject = JSONObject.parseObject(str);  
            System.out.println("这个是用JSONObject的parseObject方法来解析JSON字符串!!!");  
            for (Object map : json.entrySet()){  
                System.out.println(((Map.Entry)map).getKey()+"  "+((Map.Entry)map).getValue());  
            }  
            //第六种方式  
            /** 
             * JSONObject是Map接口的一个实现类 
             */  
            Map mapObj = JSONObject.parseObject(str,Map.class);  
            System.out.println("这个是用JSONObject的parseObject方法并执行返回类型来解析JSON字符串!!!");  
            for (Object map: json.entrySet()){  
                System.out.println(((Map.Entry)map).getKey()+"  "+((Map.Entry)map).getValue());  
            }  
            String strArr = "{{"0":"zhangsan","1":"lisi","2":"wangwu","3":"maliu"}," +  
                    "{"00":"zhangsan","11":"lisi","22":"wangwu","33":"maliu"}}";  
           // JSONArray.parse()  
            System.out.println(json);  
        }  
    }