Android工具类之Gson封装类

原文链接： https://blog.csdn.net/wanghao200906/article/details/45889955

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 GsonToBean(String gsonString, Class 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  List GsonToList(String gsonString, Class cls) {
        List list = null;
        if (gson != null) {
            list = gson.fromJson(gsonString, new TypeToken>() {
            }.getType());
        }
        return list;
    }

    /**
     * 转成list
     * 解决泛型问题
     * @param json
     * @param cls
     * @param 
     * @return
     */
    public  List jsonToList(String json, Class cls) {
        Gson gson = new Gson();
        List list = new ArrayList();
        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  List> GsonToListMaps(String gsonString) {
        List> list = null;
        if (gson != null) {
            list = gson.fromJson(gsonString,
                    new TypeToken>>() {
                    }.getType());
        }
        return list;
    }
 
    /**
     * 转成map的
     * 
     * @param gsonString
     * @return
     */
    public static  Map GsonToMaps(String gsonString) {
        Map map = null;
        if (gson != null) {
            map = gson.fromJson(gsonString, new TypeToken>() {
            }.getType());
        }
        return map;
    }