用傑克遜寫yaml？

Question

我正在使用Jackson閱讀和修改yaml文件。 效果很好。 但是，我無法找到編寫yaml所需的神奇咒語。

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.

我確信這是作家，JsonGenerators和其他東西的組合。 有人得到示例代碼嗎？

Answer 1

對於v2.8.3，以下內容應該有效：

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

嘗試：

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.