json数据与实体类之间的相互转换

短命女 2023-10-17 12:56 46阅读 0赞

package com.jingyou.application.common;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.List;
    import java.util.Map;
    import java.util.StringTokenizer;
    
    import net.sf.json.JSONArray;
    import net.sf.json.JSONObject;
    
    
    /**
     * JSON转换器.博主为大家列举N种json转换格式，实体，集合（List,Map），数组等类型，一定是大家需要和喜爱的！

详细阅读，收益匪浅！
     */
    @SuppressWarnings("unchecked")
    public class JSONUtils {
    	
    	/**1，
    	 * 转换 ServiceDataObject生成的json字符串为JSONArray对象
    	 * @param datasJSON
    	 * @return
    	 */
    	public static JSONArray createJSONArray(String datasJSON){
            String datas = JSONUtils.json2String(datasJSON, "datas");
            JSONArray results = new JSONArray();;
            JSONArray datasJSONArray = JSONArray.fromObject(datas);
    		Iterator<JSONObject> iterator = datasJSONArray.iterator();
    		while(iterator.hasNext()){
    			JSONObject data = (JSONObject) iterator.next();
    			JSONObject eachDataObject = data.getJSONObject("data");
    			results.element(eachDataObject);
    		}
    		return results;
    	}
    	
    	/**
    	 * 转换 ServiceDataObject生成的json字符串为List<JSONObject>对象
    	 * @param datasJSON
    	 * @return
    	 */
    	@SuppressWarnings("rawtypes")
    	public static List<JSONObject> createJSONObjects(String datasJSON){
    		List<JSONObject> results = new ArrayList<JSONObject>();
            String datas = JSONUtils.json2String(datasJSON, "datas");
            JSONArray jsonArray = JSONArray.fromObject(datas);
    		Iterator iterator = jsonArray.iterator();
    		while(iterator.hasNext()){
    			JSONObject data = (JSONObject) iterator.next();
    			JSONObject eachDataObject = data.getJSONObject("data");
    			results.add(eachDataObject);
    		}
    		return results;
    	}
    	
    	/**
    	 * 转换 ServiceDataObject生成的json字符串为JSONObject对象
    	 * @param datasJSON
    	 * @return
    	 */
    	@SuppressWarnings("rawtypes")
    	public static JSONObject createJSONObject(String datasJSON){
    		JSONObject result = new JSONObject();
            String datas = JSONUtils.json2String(datasJSON, "datas");
            JSONArray jsonArray = JSONArray.fromObject(datas);
    		Iterator iterator = jsonArray.iterator();
    		while(iterator.hasNext()){
    			JSONObject data = (JSONObject) iterator.next();
    			JSONObject eachDataObject = data.getJSONObject("data");
    			result = eachDataObject;
    		}
    		return result;
    	}
    	
    	
    	/**
    	 * 将json字符串转换成List<Map>(List中是Map类型).
    	 *
    	 * @param json the json
    	 * @return List<Map>
    	 * 
    	 */
    
        public static  List<Map<String,Object>> jsonToList(String json) {
            List<Map<String,Object>> listMap = new ArrayList<Map<String,Object>>();
            String JSON = json.substring(1, json.length() - 1);
            JSON = JSON.replaceAll("},", "}^");
            StringTokenizer strTokenizer = new StringTokenizer(JSON, "^");
            while (strTokenizer.hasMoreTokens()) {
                String token = strTokenizer.nextToken();
                Map<String,Object> paraMap =getMap4Json(token);
                listMap.add(paraMap);
            }
    
           return listMap;
        }
        
        /**
         * 将单个json对象转化为Map类型.
         *
         * @param jsonString the json string
         * @return the 4Json
         * 
         */
    	public static Map<String,Object> getMap4Json(String jsonString) {
            JSONObject jsonObject = JSONObject.fromObject(jsonString);
            String key;
            Object value;
            Map<String,Object> valueMap = new HashMap<String,Object>();
            Iterator<String> keyIter = jsonObject.keys();
            while (keyIter.hasNext()) {
                key =keyIter.next();
                value = String.valueOf(jsonObject.get(key));
                valueMap.put(key, value);
            }
            return valueMap;
        }
       
       /**
        * 设置单属性的JSON对象.
        *
        * @param key the key
        * @param value the value
        * @return {a:1,b:8}
        * 
        */
       public static String string2json(String key, String value) {
            JSONObject object = new JSONObject();
            object.put(key, value);
            return object.toString();
        }
        
        /**
         * 将json转为数组.
         *
         * @param json the json
         * @param valueClz the value clz
         * @return 对应的数组
         * 
         */
    	public static Object json2Array(String json, Class<?> valueClz) {
            JSONArray jsonArray = JSONArray.fromObject(json);
            return JSONArray.toArray(jsonArray, valueClz);
        }
      
        /**
         * 将Collection转换成JSON.
         *
         * @param object the object
         * @return the string
         * @param:object为集合
         */
        public static String collection2json(Object object) {
            JSONArray jsonArray = JSONArray.fromObject(object);
            return jsonArray.toString();
        }
        
        /**
         * 将数组转化为JSON.
         *
         * @param object the object
         * @return the string
         * 
         */
        public static String array2json(Object object) {
            JSONArray jsonArray = JSONArray.fromObject(object);
            return jsonArray.toString();
        }
        
        /**
         * 将Map转为JSON.
         *
         * @param object the object
         * @return the string
         * 
         */
        public static String map2json(Map<String,Object> object) {
            JSONObject jsonObject = JSONObject.fromObject(object);
            return jsonObject.toString();
        }
        
        /**
         * 将JSON转换成Map.
         *
         * @param keyArray the key array
         * @param json the json
         * @param valueClz the value clz
         * @return the map
         * @param:valueClz为Map中value的Class,
         * @param:keyArray为Map的key
         */
    	@SuppressWarnings("rawtypes")
    	public static Map json2Map(Object[] keyArray, String json, Class<?> valueClz) {
            JSONObject jsonObject = JSONObject.fromObject(json);
            Map classMap = new HashMap();
            for (int i = 0; i < keyArray.length; i++) {
                classMap.put(keyArray[i], valueClz);
            }
            return (Map) JSONObject.toBean(jsonObject, Map.class, classMap);
        }
        
        /**
         * 将POJO转换成JSON.
         *
         * @param object the object
         * @return the string
         * 
         */ 
        public static String bean2json(Object object) {
            JSONObject jsonObject = JSONObject.fromObject(object);
            return jsonObject.toString();
        }
        
        /**
         * 将JSON转换成POJO.
         *
         * @param json the json
         * @param beanClz the bean clz
         * @return the object
         * 
         */
    	@SuppressWarnings("rawtypes")
    	public static Object json2Object(String json, Class beanClz) {
            return JSONObject.toBean(JSONObject.fromObject(json), beanClz);
        }
        
        /**
         * 将JSON转换成String.
         *
         * @param json the json
         * @param key the key
         * @return the string
         */
        public static String json2String(String json, String key) {
            JSONObject jsonObject = JSONObject.fromObject(json);
            return jsonObject.get(key).toString();
        }
        
        /**
         * 将List 转换成JSON.
         *
         * @param list the list
         * @return the string
         * 
         */
    	@SuppressWarnings("rawtypes")
    	public static String list2json(List list){
    	   JSONArray jsonArray2 = JSONArray.fromObject(list);
    	   return jsonArray2.toString();
        }
    }