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java object与xml的转换
概述:以前对于XML与Java对象的转换了解比较少,今天学微信接口API时刚好接触到,所以就写下来了,初学者望大家见谅哈。
1.既然是Java对象与XML的转换,所以就需要有个Java类来获得对象,本例子主要涉及到BOY类和测试运行的类
2.代码
2.1 开始第一步的简单学习
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)//field只是类上的字段,并不是属性
public class Boy {
String name = "xu**";
}
public class TestXml {
public static void main(String args[]){
try {
JAXBContext jaxbContext = JAXBContext.newInstance(Boy.class);
Marshaller marshaller = jaxbContext.createMarshaller(); //将对象转换成XML格式
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller(); //将XML转换成对象
Boy boy = new Boy();
marshaller.marshal(boy,System.out);//以打印输出的形式显示
System.out.println();
String xmlStr = "<boy><name>许**</name></boy>";
Boy towBoy = (Boy)unmarshaller.unmarshal(new StringReader(xmlStr));
System.out.println(towBoy.name);
} catch (JAXBException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
}
打印的结果是:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><boy><name>xu**</name></boy>
许**
2.2 当boy变成下面这样子
@XmlRootElement
@XmlAccessorType(XmlAccessType.PROPERTY)//property是属性
public class Boy {
String name = "xu**";
}
打印的结果是:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><boy/>
xu**
2.3 想要有2.1的结果就需要提供name的get方法来获得属性
@XmlRootElement
@XmlAccessorType(XmlAccessType.PROPERTY)
public class Boy {
String name ="123";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
2.4 也可以通过xmlelement注解
@XmlRootElement
@XmlAccessorType(XmlAccessType.PROPERTY)
public class Boy {
String name ="123";
@XmlElement
Integer age = 10;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
打印的结果是:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><boy><age>10</age><name>123</name></boy>
许**
2.5 同时也可以将BOY改标签,并放在一个命名空间下
@XmlRootElement (name = "xu",namespace = "http://test")
@XmlAccessorType(XmlAccessType.PROPERTY)
public class Boy {
@XmlElement
String name ="123";
@XmlElement
Integer age = 10;
}
public class TestXml {
public static void main(String args[]){
try {
JAXBContext jaxbContext = JAXBContext.newInstance(Boy.class);
Marshaller marshaller = jaxbContext.createMarshaller(); //将对象转换成XML格式
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller(); //将XML转换成对象
Boy boy = new Boy();
marshaller.marshal(boy,System.out);
System.out.println();
String xmlStr = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><ns2:xu xmlns:ns2=\"http://test\"><name>许**</name><age>25</age></ns2:xu>";
Boy towBoy = (Boy)unmarshaller.unmarshal(new StringReader(xmlStr));
System.out.println(towBoy.name);
System.out.println(towBoy.age);
} catch (JAXBException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
}
打印的结果是:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><ns2:xu xmlns:ns2="http://test"><name>123</name><age>10</age></ns2:xu>
许**
25
2.6 @XmlJavaTypeAdaptor
@XmlRootElement (name = "xu",namespace = "http://test")
@XmlAccessorType(XmlAccessType.PROPERTY)
public class Boy {
@XmlElement
String name ="许**";
@XmlElement
Integer age = 25;
private TestXmlInterface testXmlInterface;
}
我们要多写一个类TestXmlInterfaceAdaptor用来返回TestXmlInterface 的一个具体实现类的推向
在转换成XML时接口TestXmlInterface 无法被转换,我们得加上@XmlJavaTypeAdaptor(TestXmlInterfaceAdaptor.class)
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java object与xml的转换