import java.util.ArrayList;
import java.util.List;
import 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 {
//不用创建对象,直接使用Gson.就可以调用方法
private static Gson gson = null;
//判断gson对象是否存在了,不存在则创建对象
static {
if (gson == null) {
//gson = new Gson();
//当使用GsonBuilder方式时属性为空的时候输出来的json字符串是有键值key的,显示形式是"key":null，而直接new出来的就没有"key":null的
gson= new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
}
}
//无参的私有构造方法
private GsonUtil() {
}
/**
* 将对象转成json格式
*
* @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) {
//传入json对象和对象类型,将json转成对象
t = gson.fromJson(gsonString, cls);
}
return t;
}
/**
* json字符串转成list
*
* @param gsonString
* @param cls
* @return
*/
public static <T> List<T> GsonToList(String gsonString, Class<T> cls) {
List<T> list = null;
if (gson != null) {
//根据泛型返回解析指定的类型,TypeToken<List<T>>{}.getType()获取返回类型
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 ObjectMapper();
private JacksonUtils() {
}
public static ObjectMapper getInstance() {
return objectMapper;
}
/**
* javaBean、列表数组转换为json字符串
*/
public static String obj2json(Object obj) throws Exception {
return objectMapper.writeValueAsString(obj);
}
/**
* javaBean、列表数组转换为json字符串,忽略空值
*/
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 {
return json2MapRecursion(json, objectMapper);
}
/**
* 把json解析成list，如果list内部的元素存在jsonString，继续解析
*
* @param json
* @param mapper 解析工具
* @return
* @throws Exception
*/
private static List<Object> json2ListRecursion(String json, ObjectMapper mapper) throws Exception {
if (json == null) {
return null;
}
List<Object> list = mapper.readValue(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;
}
/**
* 与javaBean json数组字符串转换为列表
*/
public static <T> List<T> json2list(String jsonArrayStr, Class<T> clazz) throws Exception {
JavaType javaType = getCollectionType(ArrayList.class, clazz);
List<T> lst = (List<T>) objectMapper.readValue(jsonArrayStr, javaType);
return lst;
}
/**
* 获取泛型的Collection Type
*
* @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工具类
* @version:1.0.0
*/
public class FastJsonUtils {
private static final SerializeConfig config;
static {
config = new SerializeConfig();
config.put(java.util.Date.class, new JSONLibDataFormatSerializer()); // 使用和json-lib兼容的日期输出格式
config.put(java.sql.Date.class, new JSONLibDataFormatSerializer()); // 使用和json-lib兼容的日期输出格式
}
private static final SerializerFeature[] features = {SerializerFeature.WriteMapNullValue, // 输出空置字段
SerializerFeature.WriteNullListAsEmpty, // list字段如果为null，输出为[]，而不是null
SerializerFeature.WriteNullNumberAsZero, // 数值字段如果为null，输出为0，而不是null
SerializerFeature.WriteNullBooleanAsFalse, // Boolean字段如果为null，输出为false，而不是null
SerializerFeature.WriteNullStringAsEmpty // 字符类型字段如果为null，输出为""，而不是null
};
public static String 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 = JSON.parse(textJson);
return objectJson;
}
/**
* 将string转化为序列化的json字符串
* @param keyvalue
* @return
*/
public static Object textToJson(String text) {
Object objectJson = JSON.parse(text);
return objectJson;
}
/**
* json字符串转化为map
* @param s
* @return
*/
public static Map stringToCollect(String s) {
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;
}
}
