如何在Java解析JSONArray与Json.simple？ [英] How parsing JSONArray in Java with Json.simple?

问题描述

我试着去阅读这样的JSON文件：

I try to read a JSON file like this:

{
  "presentationName" : "Here some text",
  "presentationAutor" : "Here some text",
  "presentationSlides" : [
  {
    "title" : "Here some text.",
    "paragraphs" : [
    {
        "value" : "Here some text."
    },
    {
        "value" : "Here some text."
    }
    ]
  },
  {
    "title" : "Here some text.",
    "paragraphs" : [
    {
        "value" : "Here some text.",
        "image" : "Here some text."
    },
    {
        "value" : "Here some text."
    },
    {
        "value" : "Here some text."
    }
    ]
  }
  ]
}

这是一所学校的exercice，我选择尝试使用JSON.simple（从谷歌code），但我开到其他的JSON库。我听说杰克逊和GSON：他们比JSON.simple好

It's for a school exercice, I choose to try to use JSON.simple (from GoogleCode) but I am open to another JSON libraries. I heard about Jackson and Gson: they are better than JSON.simple?

下面我当前的Java code：

Here my current Java code:

        Object obj = parser.parse(new FileReader( "file.json" ));

        JSONObject jsonObject = (JSONObject) obj;

        // First I take the global data
        String name = (String) jsonObject.get("presentationName");
        String autor = (String) jsonObject.get("presentationAutor");
        System.out.println("Name: "+name);
        System.out.println("Autor: "+autor);

        // Now we try to take the data from "presentationSlides" array
        JSONArray slideContent = (JSONArray) jsonObject.get("presentationSlides");
        Iterator i = slideContent.iterator();

        while (i.hasNext()) {
            System.out.println(i.next());
            // Here I try to take the title element from my slide but it doesn't work!
            String title = (String) jsonObject.get("title");
            System.out.println(title);
        }

我查了很多例子（有些堆栈！），但我从来没有发现我的问题的解决方案。

I check a lot of example (some in Stack!) but I never found the solution of my problem.

也许我们不能做到这一点与JSON.simple？你有什么建议？

Maybe we can't do that with JSON.simple? What do you recommend?

推荐答案

您从未指派一个新值的JSONObject ，所以在循环内它仍然指的是全部数据目的。我想你想是这样的：

You never assign a new value to jsonObject, so inside the loop it still refers to the full data object. I think you want something like:

JSONObject slide = i.next();
String title = (String)slide.get("title");

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