在写入File之前格式化JSON [英] Formatting JSON before writing to File

问题描述

目前，我正在使用 Jackson JSON Processor 写入偏好数据等等文件主要是因为我希望高级用户能够修改/备份这些数据。杰克逊非常棒，因为它非常容易使用，并且显然表现得很好（参见这里），但我似乎遇到的唯一问题是当我运行 myObjectMapper.writeValue（myFile，myJsonObjectNode）时，它会写入所有数据在 ObjectNode 到一行。我想要做的是将JSON格式化为更友好的用户格式。

Currently I'm using the Jackson JSON Processor to write preference data and whatnot to files mainly because I want advanced users to be able to modify/backup this data. Jackson is awesome for this because its incredibly easy to use and, apparently performs decently (see here), however the only problem I seem to be having with it is when I run myObjectMapper.writeValue(myFile, myJsonObjectNode) it writes all of the data in the ObjectNode to one line. What I would like to do is to format the JSON into a more user friendly format.

例如，如果我将一个简单的json树传递给它，它将写入以下：

For example, if I pass a simple json tree to it, it will write the following:

{"testArray":[1,2,3,{"testObject":true}], "anotherObject":{"A":"b","C":"d"}, "string1":"i'm a string", "int1": 5092348315}

我希望它在文件中显示为：

I would want it to show up in the file as:

{
    "testArray": [
        1,
        2,
        3,
        {
            "testObject": true
        }
    ],
    "anotherObject": {
        "A": "b",
        "C": "d"
    },
    "string1": "i'm a string",
    "int1": 5092348315
}

<有没有人知道我可以用杰克逊做到这一点的方法，还是我必须从杰克逊那里获得JSON字符串并使用另一个第三方lib进行格式化？

Is anyone aware of a way I could do this with Jackson, or do I have to get the String of JSON from Jackson and use another third party lib to format it?

提前致谢！

推荐答案

尝试创建这样

 ObjectWriter writer = mapper.defaultPrettyPrintingWriter();

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