Java 如何使用 SnakeYaml 写入 YAML 文件？
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How do I write to a YAML file using SnakeYaml?
提问by Jonas Bartkowski
Consider the following code:
考虑以下代码：
public static void dumpObjectToYaml(String key, Object O, String path) throws IOException
{
Map<String, Object> data = new HashMap<>();
data.put(key, O);
File F = new File(path);
F.mkdirs();
F.createNewFile();
//write data to File
}
This method is aiming to write the given Object O at the given key, into the YAML file at the given path. (if it doesn't exist it is created.) But obviously the main part is still missing.
此方法旨在将给定键的给定对象 O 写入给定路径的 YAML 文件中。（如果它不存在，则创建它。）但显然主要部分仍然缺失。
Now following the documentation of SnakeYaml, to create a YAML I only need to create a map and put in the Objects at the right keys, which I did.
现在按照SnakeYaml 的文档，要创建 YAML，我只需要创建一个映射并将对象放入正确的键中，我做到了。
But nowhere (at least I don't see it) is described how to create a yaml file at a certain path!
但是没有任何地方（至少我没有看到）描述了如何在某个路径上创建 yaml 文件！
The only thing I found was:
我发现的唯一一件事是：
"The Yaml.dump(Object data) method accepts a Java object and produces a YAML document"
“Yaml.dump(Object data) 方法接受一个 Java 对象并生成一个 YAML 文档”
public void testDump()
{
Map<String, Object> data = new HashMap<String, Object>();
data.put("name", "Silenthand Olleander");
data.put("race", "Human");
data.put("traits", new String[] { "ONE_HAND", "ONE_EYE" });
Yaml yaml = new Yaml();
String output = yaml.dump(data);
System.out.println(output);
}
and
和
"Yaml.dump(Object data, Writer output) will write the produced YAML document into the specified file/stream."
“Yaml.dump(Object data, Writer output) 将生成的 YAML 文档写入指定的文件/流。”
public void testDumpWriter()
{
Map<String, Object> data = new HashMap<String, Object>();
data.put("name", "Silenthand Olleander");
data.put("race", "Human");
data.put("traits", new String[] { "ONE_HAND", "ONE_EYE" });
Yaml yaml = new Yaml();
StringWriter writer = new StringWriter();
yaml.dump(data, writer);
System.out.println(writer.toString());
}
But still, even though it says exactly that at the second bit of code, it doesn't seem to support the manipulation of a certain file and it's certainly not shown how to do it.
但是，尽管它在代码的第二位准确说明了这一点，但它似乎不支持对某个文件的操作，而且肯定没有显示如何操作。
Is it only me or does the documentation feel very cryptic and specified? Half of it is about special applications that I have never even heard about. I feel really dumb just by looking at it and it makes me kind of angry.
是只有我一个人还是文档感觉非常神秘和具体？其中一半是关于我从未听说过的特殊应用程序。光是看着就觉得自己很蠢，这让我有点生气。
Anyhow; I would really appreciate any help that you could give me.
无论如何; 我真的很感激你能给我的任何帮助。
采纳答案by ig0774
If I've understood the question, it doesn't seem to have anything to do with YAML or SnakeYAML per se, but to do with how you write to a specific file in Java. Basically, what the second example you copied is showing is how to dump an object to an arbitrary java.io.Writerobject (though they use a StringWriteras this will not write anything to disk). If you want to modify this example to write to a particular file, you can do so by making use of a FileWriter, like so:
如果我理解了这个问题，它本身似乎与 YAML 或 SnakeYAML 没有任何关系，而是与您如何在 Java 中写入特定文件有关。基本上，您复制的第二个示例显示的是如何将对象转储到任意java.io.Writer对象（尽管它们使用 aStringWriter因为这不会将任何内容写入磁盘）。如果要修改此示例以写入特定文件，可以使用 a 来实现FileWriter，如下所示：
public void testDumpWriter() {
Map<String, Object> data = new HashMap<String, Object>();
data.put("name", "Silenthand Olleander");
data.put("race", "Human");
data.put("traits", new String[] { "ONE_HAND", "ONE_EYE" });
Yaml yaml = new Yaml();
FileWriter writer = new FileWriter("/path/to/file.yaml");
yaml.dump(data, writer);
}
Which will dump the map datato a YAML file. Note that it is not normally necessary to create the file yourself before opening the FileWriteras the FileWriterwill handle that for you.
这会将地图转储data到 YAML 文件。请注意，通常不需要在打开文件之前自己创建文件，FileWriter因为它FileWriter会为您处理。
回答by Aliaksandr Kavalenka
Else one way to write data
另一种写入数据的方式
Map<String, String> map = new HashMap<>();
map.put("key1", "value1");
map.put("key2", "value2");
map.put("key3", "value3");
YamlWriter writer = new YamlWriter(new FileWriter("test.yml"));
writer.write(map);
writer.close();
Output:
输出：
key1: value1
key2: value2
key3: value3
For me, in this case, I see a more readable output. From the first solution, we will see output like this:
对我来说，在这种情况下，我看到了更具可读性的输出。从第一个解决方案中，我们将看到如下输出：
{key1: value1, key2: value2, key3: value3}
If we will have a lot of data it will be hard to read
如果我们将有大量数据，将很难阅读
P.S. we need some dependency
PS我们需要一些依赖
<dependency>
<groupId>com.esotericsoftware.yamlbeans</groupId>
<artifactId>yamlbeans</artifactId>
<version>1.13</version>
</dependency>
