Android工具类之Gson封装类

让JSON操作变得简单的 Gson 封装类

import java.util.List;
import java.util.Map;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;


public class GsonUtil {
    private static Gson gson = null;
    static {
        if (gson == null) {
            gson = new Gson();
        }
    }

    private GsonUtil() {
    }

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

    /** * 转成bean * * @param gsonString * @param cls * @return */
    public static <T> T GsonToBean(String gsonString, Class<T> cls) {
        T t = null;
        if (gson != null) {
            t = gson.fromJson(gsonString, cls);
        }
        return t;
    }

   /** * 转成list * 泛型在编译期类型被擦除导致报错 * @param gsonString * @param cls * @return */
    public static <T> List<T> GsonToList(String gsonString, Class<T> cls) {
        List<T> list = null;
        if (gson != null) {
            list = gson.fromJson(gsonString, new TypeToken<List<T>>() {
            }.getType());
        }
        return list;
    }

    /** * 转成list * 解决泛型问题 * @param json * @param cls * @param <T> * @return */
    public <T> List<T> jsonToList(String json, Class<T> cls) {
        Gson gson = new Gson();
        List<T> list = new ArrayList<T>();
        JsonArray array = new JsonParser().parse(json).getAsJsonArray();
        for(final JsonElement elem : array){
            list.add(gson.fromJson(elem, cls));
        }
        return list;
    }


    /** * 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;
    }

    /** * 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;
    }