从Jackson 2.2的ObjectMapper中打印JSON

问题描述

现在我有一个 org.fasterxml.jackson.databind.ObjectMapper 的实例，想得到一个 String 使用漂亮的JSON。我的谷歌搜索的所有结果都提出了Jackson 1.x这样做的方法，我似乎无法找到适当的，不推荐使用2.2的方法。即使我不相信代码对于这个问题是绝对必要的，这就是我现在所拥有的：

Right now I have an instance of org.fasterxml.jackson.databind.ObjectMapper and would like to get a String with pretty JSON. All of the results of my Google searches have come up with Jackson 1.x ways of doing this and I can't seem to find the proper, non-deprecated way of doing this with 2.2. Even though I don't believe that code is absolutely necessary for this question, here's what I have right now:

ObjectMapper mapper = new ObjectMapper();
mapper.setSerializationInclusion(Include.NON_NULL);
System.out.println("\n\n----------REQUEST-----------");
StringWriter sw = new StringWriter();
mapper.writeValue(sw, jsonObject);
// Want pretty version of sw.toString() here

推荐答案

您可以通过在 ObjectMapper 上设置 SerializationFeature.INDENT_OUTPUT 来启用漂亮打印，如下所示：

You can enable pretty-printing by setting the SerializationFeature.INDENT_OUTPUT on your ObjectMapper like so:

mapper.enable(SerializationFeature.INDENT_OUTPUT);

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