package cn.emay.sdk.util.json;
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import java.util.HashMap;
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import java.util.Map;
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import cn.emay.sdk.util.json.gson.Gson;
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import cn.emay.sdk.util.json.gson.GsonBuilder;
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import cn.emay.sdk.util.json.gson.reflect.TypeToken;
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/**
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* json util
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*
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* @author 东旭
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*
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*/
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public class JsonHelper {
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private static Map<String, Gson> gsons = new HashMap<String, Gson>();
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private static String DEFAULT_DATE_PATTERN = "yyyy-MM-dd HH:mm:ss";
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static {
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gsons.put(DEFAULT_DATE_PATTERN, createGson(DEFAULT_DATE_PATTERN));
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}
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private static Gson createGson(String datePattern) {
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return new GsonBuilder().setDateFormat(datePattern).disableHtmlEscaping().serializeNulls().create();
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}
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public static Gson getGson() {
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return gsons.get(DEFAULT_DATE_PATTERN);
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}
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public static Gson getGson(String datePattern) {
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Gson gson = gsons.get(datePattern);
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if (gson == null) {
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gson = createGson(datePattern);
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gsons.put(datePattern, gson);
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}
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return gson;
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}
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public static GsonBuilder newGsonBuilder() {
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return new GsonBuilder();
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}
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/**
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* 将对象转换为json串
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*
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* @param obj
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* @return
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*/
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public static String toJsonString(Object obj) {
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if (obj == null) {
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return null;
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}
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return getGson().toJson(obj);
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}
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/**
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* 将对象转换为json串，自定义日期转换规则
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*
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* @param obj
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* @param datePattern
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* @return
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*/
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public static String toJsonString(Object obj, String datePattern) {
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if (obj == null) {
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return null;
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}
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return getGson(datePattern).toJson(obj);
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}
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/**
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* 将json串转换为对象
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*
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* @param clazz
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* @param jsonString
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* @return
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*/
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public static <T> T fromJson(Class<T> clazz, String jsonString) {
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if (jsonString == null) {
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return null;
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}
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return getGson().fromJson(jsonString, clazz);
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}
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/**
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* 将json串转换为对象
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*
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* @Type type
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* @param jsonString
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* @return
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*/
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public static <T> T fromJson(TypeToken<T> token, String jsonString) {
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if (jsonString == null) {
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return null;
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}
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return getGson().fromJson(jsonString, token.getType());
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}
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/**
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* 将json串转换为对象
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*
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* @Type type
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* @param jsonString
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* @return
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*/
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public static <T> T fromJson(TypeToken<T> token, String jsonString, String datePattern) {
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if (jsonString == null) {
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return null;
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}
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return getGson(datePattern).fromJson(jsonString, token.getType());
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}
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/**
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* 将json串转换为对象
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*
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* @param clazz
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* @param jsonString
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* @return
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*/
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public static <T> T fromJson(Class<T> clazz, String jsonString, String datePattern) {
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if (jsonString == null) {
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return null;
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}
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return getGson(datePattern).fromJson(jsonString, clazz);
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}
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}
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