用杰克逊写yaml？ [英] Use Jackson to write yaml?

问题描述

我正在使用Jackson阅读和修改yaml文件。效果很好。但是我无法找到编写yaml所需的神奇咒语。

I'm using Jackson to read and modify yaml files. Works great. I can't find the magic incantations needed to write the yaml, though.

ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
ObjectNode root = (ObjectNode)mapper.readTree(yamlFileIn);
// modify root here
mapper.writeValue(yamlFileOut, root); // writes json, not yaml. not sure why.

我确信这是作家，JsonGenerators和其他东西的组合。有人得到示例代码吗？

I'm sure it's some combination of writers, JsonGenerators, and something else. Anyone got sample code?

推荐答案

对于v2.8.3，以下内容应该有效：

For v2.8.3 the following should work:

YAMLFactory yf = new YAMLFactory();
ObjectMapper mapper = new ObjectMapper(yf);
ObjectNode root = (ObjectNode) mapper.readTree(yamlFileIn);
// modify root here     
FileOutputStream fos = new FileOutputStream(yamlFileOut);
SequenceWriter sw = mapper.writerWithDefaultPrettyPrinter().writeValues(fos);
sw.write(root);

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