获取Jackson XMLMapper以在代码中设置根元素名称

问题描述

如何在序列化时让Jackson的XMLMapper设置根xml元素的名称?

How do I get Jackson's XMLMapper to set the name of the root xml element when serializing?

如果要序列化pojo，则有一个注释可以执行:@XmlRootElement(name ="blah").但是我正在序列化一个通用的Java类LinkedHashMap，所以我不能使用注释.

There's an annotation to do it, if you're serializing a pojo: @XmlRootElement(name="blah"). But I'm serializing a generic Java class, LinkedHashMap, so I can't use an annotation.

可能在某处设置了一些开关.翻看杰克逊代码，我看到了一个名为SerializationConfig.withRootName()的类，但是我不知道如何使用它.

There's probably some switch somewhere to set it. Poking around in Jackson code, I see a class named SerializationConfig.withRootName(), but I've no clue how to use it.

推荐答案

您可以使用 ObjectWriter.withRootName 方法.这是示例:

You can override the root element of the XML output using the ObjectWriter.withRootName method. Here is example:

public class JacksonXmlMapper {

    public static void main(String[] args) throws JsonProcessingException {

        Map<String, Object> map = new LinkedHashMap<String, Object>();
        map.put("field1", "v1");
        map.put("field2", 10);
        XmlMapper mapper = new XmlMapper();
        System.out.println(mapper
                .writer()
                .withRootName("root")
                .writeValueAsString(map));

    }
}

输出:

<root><field1>v1</field1><field2>10</field2></root>

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