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

<?xml version="1.0" encoding="UTF-8" ?>
<root><result status="success" msg="成功"/>
</root>

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;}
}

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xmlJAXBContext context = JAXBContext.newInstance(obj.getClass());//创建Marshaller对象，用于将java对象序列化为xmlMarshaller marshaller = context.createMarshaller();//设置编码格式marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");//格式化生成xmlmarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();//将java对象序列化为xmlmarshaller.marshal(obj, byteArrayOutputStream);return byteArrayOutputStream.toString("UTF-8");} catch (JAXBException | UnsupportedEncodingException e) {e.printStackTrace();}return null;}
}

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);}

输出结果：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root><result status="success" msg="成功"/>
</root>

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\"", ""));}

输出结果：

<?xml version="1.0" encoding="UTF-8" ?>
<root><result status="success" msg="成功"/>
</root>