利用Gson快速解析json

需要導入Gson包，解析成一個對象或一個包含此對象的list

JsonHelper代碼如下：

import java.util.ArrayList;
import java.util.List;
import android.text.TextUtils;

import com.google.gson.Gson;
import com.google.gson.JsonParseException;
import com.google.gson.JsonParser;
import com.google.gson.reflect.TypeToken;
public class JsonHelper {
    private static JsonHelper util;

public static JsonHelper getInstance() {

    if (util == null) {
        util = new JsonHelper();

    }
    return util;

}
private JsonHelper() {
    super();
}

public String createJsonString(Object value) {
    Gson gson = new Gson();
    String str = gson.toJson(value);
    return str;
}

public <T> T getObject(String jsonString, Class<T> cls) {
    T t = null;
    try {
        if (isGoodJson(jsonString)) {
            Gson gson = new Gson();
            t = gson.fromJson(jsonString, cls);
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
    return t;
}

public <T> List<T> getList(String jsonString, TypeToken<T> tt) {
    List<T> list = new ArrayList<T>();
    try {
        if (isGoodJson(jsonString)) {
            Gson gson = new Gson();

            list = gson.fromJson(jsonString, tt.getType());
        }

    } catch (Exception e) {
    }
    return list;
}

public boolean isBadJson(String json) {
    return !isGoodJson(json);
}

public boolean isGoodJson(String json) {
    if (TextUtils.isEmpty(json)) {
        return false;
    }
    try {
        new JsonParser().parse(json);

    } catch (JsonParseException e) {
        return false;
    }

    return true;
}


}</pre> 


 使用方法 

Bean bean = new Bean();
        bean.age="30";
        bean.name="name";
        String result = JsonHelper.getInstance().createJsonString(bean);
        System.out.println(result);
        Bean bean2 = JsonHelper.getInstance().getObject(result, Bean.class);
        System.out.println(bean2.toString());


    ArrayList<Bean> list = new ArrayList<Bean>();
    list.add(bean);
    list.add(bean2);
    result = JsonHelper.getInstance().createJsonString(list);
    System.out.println(result);
    List<ArrayList<Bean>> list2 = JsonHelper.getInstance().getList(result, new TypeToken<ArrayList<Bean>>(){});
    System.out.println(list2.toString());</pre> 



 Bean.java 

public class Bean {


String name="";
String age="";
@Override
public String toString() {
    return "Bean [name=" + name + ", age=" + age + "]";
}




}</pre>