JAXB实现JAVA对象和XML字符串的互相转换实例

最新推荐文章于 2025-06-11 16:34:55 发布

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最新推荐文章于 2025-06-11 16:34:55 发布

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分类专栏： Java

本文链接：https://blog.youkuaiyun.com/wangjian_925/article/details/80392852

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1 篇文章

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本文介绍了如何使用JAXB库将JAVA对象转换为XML字符串，并反之将XML转换回JAVA对象。通过创建特定的JAVA类并利用JAXB的注解，实现了复杂对象如`ZUVMP`及其子类`ZUVMP03Pavload`的转换。示例中详细展示了转换过程，包括XML的生成和解析方法。

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输出：

<?xml version="1.0" encoding="utf-8" ?>

<Noun>ZUVMP03</Noun>

</Header>

</Pavload>

</Pavload>

</RequestMessage>

示例：

public abstract class BaseZuvmp {

}

2：

@XmlRootElement(name = "RequestMessage")

public class ZUVMP {

private Header header;

private List<BaseZuvmp> pavloads;

@XmlElement(name="Header")

public Header getHeader() {

return header;

}

public void setHeader(Header header) {

this.header = header;

}

@XmlElementRef(name="Pavload")

public List<BaseZuvmp> getPavloads() {

return pavloads;

}

public void setPavloads(List<BaseZuvmp> pavloads) {

this.pavloads = pavloads;

}

@XmlRootElement(name = "Pavload")

public class ZUVMP03Pavload extends BaseZuvmp implements Serializable{

/**

private static final long serialVersionUID = -378651538178333555L;

/**

* 设备编码

private String clxtcbbm;

/**

* 设备说明

private String eqktx;

@XmlElement(name="CLXTCBBM")

public String getClxtcbbm() {

return clxtcbbm;

}

public void setClxtcbbm(String clxtcbbm) {

this.clxtcbbm = clxtcbbm;

}

@XmlElement(name="EQKTX")

public String getEqktx() {

return eqktx;

}

public void setEqktx(String eqktx) {

this.eqktx = eqktx;

}

public class XmlUtil {

public static String beanToXml(Object obj, Class<?>... load) throws JAXBException {

JAXBContext context = JAXBContext.newInstance(load);

Marshaller marshaller = context.createMarshaller();

// 格式化输出xml

marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

// 设置输出xml编码格式

marshaller.setProperty(Marshaller.JAXB_ENCODING, "utf-8");

StringWriter writer = new StringWriter();

marshaller.marshal(obj, writer);

// 去掉standalone属性

return writer.toString().replace("standalone=\"yes\"", "");

}

public static <T> T xmlToBean(String xml,Class<?>...types) throws JAXBException {

JAXBContext context = JAXBContext.newInstance(types);

Unmarshaller um = context.createUnmarshaller();

StringReader sr = new StringReader(xml);

return (T) um.unmarshal(sr);

}

5.测试：

private static String getXmlStr() {
String aString = "";
try {
ZUVMP zuvmp = new ZUVMP();
Header header = new Header();
header.setNoun("ZUVMP03");

ZUVMP03Pavload pavload31 = new ZUVMP03Pavload();
pavload31.setClxtcbbm("设备编码1");
pavload31.setEqktx("设备说明1");

ZUVMP03Pavload pavload32 = new ZUVMP03Pavload();
pavload32.setClxtcbbm("设备编码2");
pavload32.setEqktx("设备说明2");

List<BaseZuvmp> pavloadBase = new ArrayList<>();
pavloadBase.add(pavload31);
pavloadBase.add(pavload32);
zuvmp.setHeader(header);
zuvmp.setPavloads(pavloadBase);
aString = XmlUtil.beanToXml(zuvmp, ZUVMP03Pavload.class, ZUVMP.class);
} catch (Exception e) {
e.printStackTrace();
}
return aString;

}

private static void xmlToBean(String xml) {
try {
Object obj = XmlUtil.xmlToBean(xml, ZUVMP03Pavload.class, ZUVMP.class);
System.out.println(obj);
} catch (Exception e) {
e.printStackTrace();
}

}

注：如果ZUMP这样写，则xml嵌套的节点会输出xmlns，xmlns：xsi，将集合列注解改用@XmlElementRef会报错

@XmlRootElement(name = "RequestMessage")
public class ZUVMP {
private Header header;
private List<T> pavloads;

@XmlElement(name="Header")
public Header getHeader() {
return header;
}
public void setHeader(Header header) {
this.header = header;
}

@XmlElement(name="Pavload")
public List<T> getPavloads() {
return pavloads;
}
public void setPavloads(List<T> pavloads) {
this.pavloads = pavloads;
}
}