Gson / Jackson / FastJson Tools

Import of java.util.ArrayList;
 Import java.util.List;
 Import a java.util.Map; 

Import com.google.gson.Gson;
 Import com.google.gson.GsonBuilder;
 Import com.google.gson.JsonArray;
 Import COM .google.gson.JsonElement;
 Import com.google.gson.JsonParser;
 Import com.google.gson.reflect.TypeToken; 


public  class GsonUtil {
     // do not create an object, you can call directly Gson method. 
    Private  static Gson GSON = null ;
     // determines whether an object exists gson, the object does not exist, create 
    static {
         iF(GSON == null ) {
             // GSON Gson new new = ();
             // When using GsonBuilder mode attribute is empty json output of the key for key string is displayed in the form of a "key": null, new direct out no "key": null the 
            GSON = new GsonBuilder () setDateFormat. ( "the mM-dd-YYYY HH: mm: SS" ) .create (); 
        } 
    } 
    // no parameters private constructor 
    Private GsonUtil () { 
    } 

    / ** 
     * json the object into a format 
     * 
     * @param Object 
     * @return String
      * / 
    public  static String GsonString (Object Object) { 
        String gsonString= null;
        if (gson != null) {
            gsonString = gson.toJson(object);
        }
        return gsonString;
    }

    /**
     * 将json转成特定的cls的对象
     * 
     * @param gsonString
     * @param cls
     * @return
     */
    public static <T> T GsonToBean(String gsonString, Class<T> cls) {
        T t = null;
        if (gson != null) {
            //Json incoming objects and object types, the object is transformed into json 
            T = gson.fromJson (gsonString, CLS); 
        } 
        return T; 
    } 

    / ** 
     * json string converted into List 
     * 
     * @param gsonString 
     * @param CLS 
     * @ return 
     * / 
    public  static <T> List <T> GsonToList (String gsonString, Class <T> CLS) { 
        List <T> List = null ;
         IF (! GSON = null ) {
             // returns parsed according to the generic type specified , TypeToken <List <T >> { }. getType () Get return type
            list = gson.fromJson(gsonString, new TypeToken<List<T>>() {
            }.getType());
        }
        return list;
    }

    /**
     * json字符串转成list中有map的
     * 
     * @param gsonString
     * @return
     */
    public static <T> List<Map<String, T>> GsonToListMaps(String gsonString) {
        List<Map<String, T>> list = null;
        if (gson != null) {
            list = gson.fromJson(gsonString,
                    new TypeToken<List<Map<String, T>>>() {
                    }.getType());
        }
        return list;
    }

    /**
     * json字符串转成map的
     * 
     * @param gsonString
     * @return
     */
    public static <T> Map<String, T> GsonToMaps(String gsonString) {
        Map<String, T> map = null;
        if (gson != null) {
            map = gson.fromJson(gsonString, new TypeToken<Map<String, T>>() {
            }.getType());
        }
        return map;
    }
}

 

 

public  class JacksonUtils { 

    Private  Final  static ObjectMapper ObjectMapper = new new ObjectMapper (); 

    Private JacksonUtils () { 

    } 

    public  static ObjectMapper the getInstance () {
         return ObjectMapper; 
    } 

    / ** 
     * javaBean, json string array into a list 
     * / 
    public  static String obj2json (Object obj) throws Exception {
         return objectMapper.writeValueAsString (obj); 
    } 

    / ** 
     * javaBean, json list array into a string, ignoring null 
     * / 
    public  static String obj2jsonIgnoreNull(Object obj) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        return mapper.writeValueAsString(obj);
    }

    /**
     * json 转JavaBean
     */

    public static <T> T json2pojo(String jsonString, Class<T> clazz) throws Exception {
        objectMapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
        return objectMapper.readValue(jsonString, clazz);
    }

    /**
     * json字符串转换为map
     */
    public static <T> Map<String, Object> json2map(String jsonString) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        return mapper.readValue(jsonString, Map.class);
    }

    /**
     * json字符串转换为map
     */
    public static <T> Map<String, T> json2map(String jsonString, Class<T> clazz) throws Exception {
        Map<String, Map<String, Object>> map = objectMapper.readValue(jsonString, new TypeReference<Map<String, T>>() {
        });
        Map<String, T> result = new HashMap<String, T>();
        for (Map.Entry<String, Map<String, Object>> entry : map.entrySet()) {
            result.put(entry.getKey(), map2pojo(entry.getValue(), clazz));
        }
        return result;
    }

    /**
     * 深度转换json成map
     *
     * @param json
     * @return
     */
    public static Map<String, Object> json2mapDeeply(String json) throws Exception {
        returnjson2MapRecursion (json, ObjectMapper); 
    } 

    / ** 
     * json parsed into the list, if the list element is present inside jsonString, continue parsing 
     * 
     * @param json 
     * @param Mapper analysis tool 
     * @return 
     * @throws Exception
      * / 
    Private  static List <Object> json2ListRecursion (String JSON, ObjectMapper Mapper) throws Exception {
         IF (JSON == null ) {
             return  null ; 
        } 

        List <Object> = mapper.readValue List (JSON, List. class);

        for (Object obj : list) {
            if (obj != null && obj instanceof String) {
                String str = (String) obj;
                if (str.startsWith("[")) {
                    obj = json2ListRecursion(str, mapper);
                } else if (obj.toString().startsWith("{")) {
                    obj = json2MapRecursion(str, mapper);
                }
            }
        }

        return list;
    }

    /**
     * 把json解析成map，如果map内部的value存在jsonString，继续解析
     *
     * @param json
     * @param mapper
     * @return
     * @throws Exception
     */
    private static Map<String, Object> json2MapRecursion(String json, ObjectMapper mapper) throws Exception {
        if (json == null) {
            return null;
        }

        Map<String, Object> map = mapper.readValue(json, Map.class);

        for (Map.Entry<String, Object> entry : map.entrySet()) {
            Object obj = entry.getValue();
            if (obj != null && obj instanceof String) {
                String str = ((String) obj);

                if (str.startsWith("[")) {
                    List<?> list = json2ListRecursion(str, mapper);
                    map.put(entry.getKey(), list);
                } else if (str.startsWith("{")) {
                    Map<String, Object> mapRecursion = json2MapRecursion(str, mapper);
                    map.put (entry.getKey (), mapRecursion); 
                } 
            } 
        } 

        return Map; 
    } 

    / ** 
     * javaBean json array and string into a list 
     * / 
    public  static <T> List <T> json2list (String jsonArrayStr, Class <T> clazz) throws Exception { 

        The javaType the javaType = getCollectionType (the ArrayList. class , clazz); 
        List <T> LST = (List <T> ) objectMapper.readValue (jsonArrayStr, the javaType);
         return LST; 
    } 


    / ** 
     * Get generics Type Collection 
     * 
     *@param collectionClass 泛型的Collection
     * @param elementClasses  元素类
     * @return JavaType Java类型
     * @since 1.0
     */
    public static JavaType getCollectionType(Class<?> collectionClass, Class<?>... elementClasses) {
        return objectMapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);
    }


    /**
     * map  转JavaBean
     */
    public static <T> T map2pojo(Map map, Class<T> clazz) {
        return objectMapper.convertValue(map, clazz);
    }

    /**
     * map 转json
     *
     * @param map
     * @return
     */
    public static String mapToJson(Map map) {
        try {
            return objectMapper.writeValueAsString(map);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * map  转JavaBean
     */
    public static <T> T obj2pojo(Object obj, Class<T> clazz) {
        return objectMapper.convertValue(obj, clazz);
    }
}

 

 

/ ** 
 * FASTJSON tools 
 * @version : 1.0.0
  * / 
public  class FastJsonUtils { 
 
    Private  static  Final SerializeConfig config; 
 
    static { 
        config = new new SerializeConfig (); 
        config.put (java.util.Date. Class , new new JSONLibDataFormatSerializer ( )); // use and json-lib date output formats compatible 
        config.put (a java.sql.Date. class , new new JSONLibDataFormatSerializer ()); // use json-lib and output formats compatible date 
    } 
 
    Private  static Final SerializerFeature [] = {SerializerFeature.WriteMapNullValue Features, // output vacant field 
            SerializerFeature.WriteNullListAsEmpty, // List If the field is null, the output is [], not null 
            SerializerFeature.WriteNullNumberAsZero, // numeric field If null, the output is 0, not null 
            SerializerFeature.WriteNullBooleanAsFalse, // Boolean is false if the field is null, the output, rather than the null 
            SerializerFeature.WriteNullStringAsEmpty // character type if the field is null, the output is "" not null 
    }; 
    
 
    public  static String the toJSONString (Object Object) {
         return JSON.toJSONString (Object, config, Features); 
    }
    
    public static String toJSONNoFeatures(Object object) {
        return JSON.toJSONString(object, config);
    }
    
 
 
    public static Object toBean(String text) {
        return JSON.parse(text);
    }
 
    public static <T> T toBean(String text, Class<T> clazz) {
        return JSON.parseObject(text, clazz);
    }
 
    // 转换为数组
    public static <T> Object[] toArray(String text) {
        return toArray(text, null);
    }
 
    // 转换为数组
    public static <T> Object[] toArray(String text, Class<T> clazz) {
        return JSON.parseArray(text, clazz).toArray();
    }
 
    // 转换为List
    public static <T> List<T> toList(String text, Class<T> clazz) {
        return JSON.parseArray(text, clazz);
    }
 
    /**
     * 将javabean转化为序列化的json字符串
     * @param keyvalue
     * @return
     */
    public static Object beanToJson(KeyValue keyvalue) {
        String textJson = JSON.toJSONString(keyvalue);
        Object objectJson  =The JSON.parse (textJson);
         return objectJson; 
    } 
    
    / ** 
     * string will be converted to serialized json string 
     * @param keyValue 
     * @return 
     * / 
    public  static Object textToJson (String text) { 
        Object objectJson   = the JSON.parse ( text);
         return objectJson; 
    } 
    
    / ** 
     * JSON string into Map 
     * @param S 
     * @return 
     * / 
    public  static the Map stringToCollect (string S) { 
        the Map m = JSONObject.parseObject (S);
        return m;
    }
    
    /**
     * 将map转化为string
     * @param m
     * @return
     */
    public static String collectToString(Map m) {
        String s = JSONObject.toJSONString(m);
        return s;
    }
    
}