转换JSON字符串到java对象？ [英] Converting json string to java object?

问题描述

我一直在四处寻找相关的转换JSON字符串到Java对象的例子，但没有找到任何很好的例子。一个我发现真的很基本的一次，没有真正处理复杂的JSON字符串。

I have been looking around for examples related to converting JSON strings to Java object but haven't found any good examples. The one I found was really basic once and not really dealing with complex JSON strings.

我想提出一个应用程序翻译从英语到使用谷歌翻译API不同语言的字符串。在查询谷歌的反应是...... foolowing文本格式的JSON，

I am making an app to translate strings from english to different languages using google translate api. Google's response upon query is...foolowing text is formatted in JSON,

{"data":{"translations":[{"translatedText":"Bonjour tout le monde"}]}} 

我approch至今使用GSON API，但是我通过实际卡住我应该怎么处理这个complecated结果，并创建Java对象？

my approch so far is using GSON API, however I am stuck by actually how should I manipulate this complecated result and create java object?

我的Java类是......。

My java class is.. .

import com.google.gson.Gson;

public class JSONConverter {

private String traslatedText;

/**
 * Create an object of it self by manipulating json string
 * @param json type: String
 * @return String Translated text result from JSON responce
 */
public String getTranslation(String json){  
    Gson gson = new Gson();
    JSONConverter obj = gson.fromJson(json, JSONConverter.class);

    return obj.getTranslationForReturn();
}

/**
 * Method return a translation to a private call
 * @return String translation
 */
private String getTranslationForReturn(){
    return this.traslatedText;
 }
}

以上approch不工作，因为我没有得到卓悦兜售世界报上的回报，

Above approch is not working since I am not getting "Bonjour tout le monde" on return,

这将是非常高兴，如果有人可以延长我的理解。

it would be great pleasure if someone can extend my understanding.

推荐答案

编辑： 你需要你的Java数据类是JSON的精确模型。所以，你的

You need your java Data class to be an exact model of the JSON. So your

{"data":{"translations":[{"translatedText":"Bonjour tout le monde"}]}} 

变成了：

class DataWrapper {
    public Data data;

    public static DataWrapper fromJson(String s) {
        return new Gson().fromJson(s, DataWrapper.class);
    }
    public String toString() {
        return new Gson().toJson(this);
    }
}
class Data {
    public List<Translation> translations;
}
class Translation { 
    public String translatedText;
}

由于对象模型变得更加复杂了org.json风格code改变方向朝不可读而GSON /杰克逊风格的对象映射仍然只是普通Java对象。

As the object model gets more complicated the org.json style code veers towards unreadable whereas the gson/jackson style object mapping is still just plain java objects.

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