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Json解析工具类JsonHelper

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利用Gson快速解析json 需要导入Gson包,解析成一个对象或一个包含此对象的list JsonHelper代码如下: ```java 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;
}

}

 使用方法 ```java
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());

Bean.java

public class Bean {

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

}

标签:java

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