用杰克逊写yaml？

Question

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.

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？

Answer 1

对于v2.8.3,以下内容应该有效:

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);

Answer 2

尝试：

YAMLFactory yf = new YAMLFactory();
ObjectMapper mapper = new ObjectMapper(yf);
ObjectNode root = (ObjectNode) mapper.readTree(yamlFileIn);
// modify root here     
FileOutputStream fos = new FileOutputStream(yamlFileOut);
yf.createGenerator(fos).writeObject(root); // works. yay.