在Java中将JSON对象转换为另一个JSON对象

问题描述：

Java class JSONObject:

我有一个JSON对象，我只想从其中提取一些键/值对到另一个JSON对象中.另外，我想更改提取键的名称.最后，我要使输出对象平坦"(即深度1中的所有元素).

I have a JSON object, from which I want to extract only some of the key/value pairs into another JSON object. In addition, I want to change the names of the extracted keys. And finally, I want to have the output object "flat" (i.e., all the elements in depth 1).

例如:

输入对象:

{
    "a":"val_a",
    "b":
    {
        "b1":"val_b1",
        "b2":"val_b2"
    },
    "c":
    {
        "c1":"val_c1",
        "c2":
        {
            "c21":"val_c21",
            "c22":"val_c22"
        }
    }
}

输出对象:

{
    "x":"val_a",
    "y":"val_b1",
    "z":"val_c22"
}

实现此目的的最佳方式(最干净")是什么?

What is the best ("cleanest") way to implement this?

目前，我正在手动"一个接一个地提取字段，例如(对于上面的示例):

At present, I'm extracting the fields one by one "manually", like so (for the example above):

JSONObject output = new JSONObject();
output.put("x",input.getString("a"));
output.put("y",input.getJSONObject("b").getString("b1"));
output.put("z",input.getJSONObject("c").getJSONObject("c2").getString("c22"));

是否存在某种正则表达式"可以帮助我一口气"实现这一目标?

Is there some sort of "regular expression" that would help me to achieve this in "one shot"?

高度赞赏给出示例的答案.

An answer on the given example would be highly appreciated.

谢谢

答

一种替代方法是在Java中使用 JSON 框架，将您的JSON对象转换为Java，执行操作并生成新的JSON对象.

One alternative could be to use the JSON in Java framework to transform your JSON object into Java, perform operations and generate new JSON objects.

抱歉造成误会.

您真的应该选择推荐的框架，例如一个或@Alessio.尽管可以通过使用正则表达式来实现，但我个人还是建议反对，因为您要查找的嵌套和/或对象有所变化可以带来正则表达式本身的巨大变化.因此，尽管正则表达式可以更快地完成工作，但它可能不那么易读和可维护.

You should really go for a framework such as the one or @Alessio recommended. Although this should be possible to be done through the use of a regular expression, personally, I would recommend against it since a change in nesting and/or object you are looking for can bring about a big change in the regex itself. Thus, although a regex can get the job done quicker, it might not be as readable and maintainable.

在Java中将JSON对象转换为另一个JSON对象

相关推荐