java 用Jackson写yaml？
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Use Hymanson to write yaml?
提问by ccleve
I'm using Hymanson to read and modify yaml files. Works great. I can't find the magic incantations needed to write the yaml, though.
我正在使用 Hymanson 读取和修改 yaml 文件。效果很好。不过，我找不到编写 yaml 所需的魔法咒语。
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.
I'm sure it's some combination of writers, JsonGenerators, and something else. Anyone got sample code?
我确信它是作家、JsonGenerators 和其他东西的某种组合。有人有示例代码吗？
回答by gilbertpilz
For v2.8.3 the following should work:
对于 v2.8.3，以下应该有效：
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);
回答by ccleve
Try:
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.
