Gson使用封裝

讓JSON操作變得簡單的 Gson 封裝類

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() {
}

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

/**
 * 轉成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;
}

/**
 * 轉成list
 * 
 * @param gsonString
 * @param cls
 * @return
 */
public static <T> List<T> GsonToList(String gsonString, Class<T> cls) {
    List<T> list = null;
    if (gson != null) {
        list = gson.fromJson(gsonString, new TypeToken<List<T>>() {
        }.getType());
    }
    return list;
}

/**
 * 轉成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;
}

/**
 * 轉成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;
}</pre>