使用JAXB将Java对象转xml

使用JAXB将Java对象转xml

1. 要求生成的xml

<root>
    <result status="success" msg="成功"/>
root>
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2. Java对象

RootVO.java

@Data
@XmlRootElement(name = "root")
@XmlAccessorType(XmlAccessType.FIELD)
public class RootVO {

    @XmlElement(name = "result")
    public ResultVO result;


    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    @XmlRootElement(name = "result")
    @XmlAccessorType(XmlAccessType.FIELD)
    public static class ResultVO{

        @XmlAttribute(name = "status")
        public String status;

        @XmlAttribute(name = "msg")
        public String msg;
    }
}
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3. 封装的工具类

XmlUtil.java

public class XmlUtil {

    public static String objToXml(Object obj) {
        try {
            //创建JAXB对象，用于映射java类和xml
            JAXBContext context = JAXBContext.newInstance(obj.getClass());
            //创建Marshaller对象，用于将java对象序列化为xml
            Marshaller marshaller = context.createMarshaller();
            //设置编码格式
            marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
            //格式化生成xml
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            //将java对象序列化为xml
            marshaller.marshal(obj, byteArrayOutputStream);
            return byteArrayOutputStream.toString("UTF-8");
        } catch (JAXBException | UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }
}
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4. 测试

   public static void main(String[] args) {
       RootVO rootVO = new RootVO();
       RootVO.ResultVO resultVO = new RootVO.ResultVO("success","成功");
       rootVO.setResult(resultVO);
       String xmlContent = XmlUtil.objToXml(rootVO);
       System.out.println(xmlContent);
   }
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输出结果：

<root>
    <result status="success" msg="成功"/>
root>
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取掉standalone

	public static void main(String[] args) {
	    RootVO rootVO = new RootVO();
	    RootVO.ResultVO resultVO = new RootVO.ResultVO("success","成功");
	    rootVO.setResult(resultVO);
	    String xmlContent = XmlUtil.objToXml(rootVO);
	    System.out.println(xmlContent.replace("standalone=\"yes\"", ""));
	}
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输出结果：

<root>
    <result status="success" msg="成功"/>
root>
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