由于jdk9开始引入module功能，jaxb不再是jdk默认库的一部分，所以不能直接使用了，直接使用或者升级jdk会遇到各种异常，需要手工引入才行。
引入方法其实也非常简单：
pom.xml加入依赖即可。
<![CDATA[
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>4.0.3</version>
</dependency>
]]>
下面是JAXB简单介绍及使用示例。
1.JAXB是什么？
通过JAXB可以方便实现JAVA对象与XML之间转换。
1.1 JAXBContext Jaxb的上下文，通过这个对象我们能拿到另外两个核心对象Unmarshaller(用于解析xml)和Marshaller(生成xml)
1.2 JAXBContext通常使用它的静态方法newInstance(Class className)来获得对象
1.3 Unmarshaller用于解析xml 通过JAXBContext的createUnmarshaller方法获得到
1.4 Marshaller用于生成xml 通过JAXBContext的createMarshaller方法获得到
2.1使用示例
<![CDATA[
public class XMLTemplateUtil {
public static void main(String[] args) {
String path1="D:\\zhubajie\\比赛软件\\橄榄球 马赛下注出票系统。\\TodayNRL-XML\\TodayNRL_1.xml";
File f1=new File(path1);
try {
f1.createNewFile();
JAXBContext jaxbContext = JAXBContext.newInstance(TodayNRLDto.class);
TodayNRLDto t=new TodayNRLDto();
SessionDto s1=new SessionDto();
s1.setCode("1");
SessionDto s2=new SessionDto();
s2.setCode("2");
List<SessionDto> sList=new ArrayList<SessionDto>();
sList.add(s1);
sList.add(s2);
t.setSession(sList);
jaxbContext.createMarshaller().marshal(t, f1);
} catch (JAXBException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
]]>
2.2生成的XML文件
<![CDATA[
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<TodayNRL name="n1">
<session code="1" date="2023">
<abandoned>false</abandoned></session>
<session code="2" date="2024">
<abandoned>false</abandoned>
</session></TodayNRL>
]]>
2.3 Java Beans
<![CDATA[
@XmlRootElement(name="TodayNRL")
@XmlAccessorType
@XmlAccessorOrder(XmlAccessOrder.ALPHABETICAL)
public class TodayNRLDto {
private Collection<SessionDto> session;
public TodayNRLDto() {
}
public Collection<SessionDto> getSession() {
return session;
}
@XmlElement
public void setSession(Collection<SessionDto> session) {
this.session = session;
}
@Override
public String toString() {
return "TodayNRLDto{" + "session=" + session + '}';
}
}
]]>
<![CDATA[
package cn.bsdn.projs.betting.xml.dto;
import jakarta.xml.bind.annotation.XmlAttribute;
import jakarta.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "SESSION")
public class SessionDto {
private String date;
private String round;
private String name;
private String code;
private String t1;
private String t2;
private String type;
private String status;
private boolean abandoned;
//Abandoned="false" Status="">
public SessionDto() {
}
public String getRound() {
return round;
}
public void setRound(String round) {
this.round = round;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getT1() {
return t1;
}
public void setT1(String t1) {
this.t1 = t1;
}
public String getT2() {
return t2;
}
public void setT2(String t2) {
this.t2 = t2;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public boolean isAbandoned() {
return abandoned;
}
public void setAbandoned(boolean abandoned) {
this.abandoned = abandoned;
}
public String getDate() {
return date;
}
@XmlAttribute(name="DATE")
public void setDate(String date) {
this.date = date;
}
@Override
public String toString() {
return "SessionDto{" + "date=" + date + ", round=" + round + ", name=" + name + ", code=" + code + ", t1=" + t1 + ", t2=" + t2 + ", type=" + type + ", status=" + status + ", abandoned=" + abandoned + '}';
}
}
]]>