JAXB完成对象与XML之间的转换

最新推荐文章于 2023-05-18 10:45:48 发布

原创最新推荐文章于 2023-05-18 10:45:48 发布 · 138 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#java

XML 专栏收录该内容

1 篇文章

订阅专栏

本文通过一个简单的例子展示了如何使用 Java 的 JAXB (Java Architecture for XML Binding) 技术将 Java 对象转换为 XML 文档，并从 XML 文件中反序列化回 Java 对象。示例包括 Maven 依赖配置、Java 类定义、测试代码及运行结果。

1.Maven Dependency

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>org.fool.xml</groupId>
	<artifactId>xml</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<junit-version>4.11</junit-version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit-version}</version>
			<scope>test</scope>
		</dependency>
	</dependencies>
</project>

2.Project Directory

3.src/main/java

Group.java

package org.fool.xml.jaxb;

public class Group
{
	private int id;
	private String name;

	public Group()
	{
	}

	public Group(int id, String name)
	{
		this.id = id;
		this.name = name;
	}

	public int getId()
	{
		return id;
	}

	public void setId(int id)
	{
		this.id = id;
	}

	public String getName()
	{
		return name;
	}

	public void setName(String name)
	{
		this.name = name;
	}

	@Override
	public String toString()
	{
		return "Group [id=" + id + ", name=" + name + "]";
	}

}

User.java

package org.fool.xml.jaxb;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class User
{
	private int id;
	private String username;
	private String password;
	private String nickname;
	private Group group;

	public User()
	{
	}

	public User(int id, String username, String password, String nickname,
			Group group)
	{
		this.id = id;
		this.username = username;
		this.password = password;
		this.nickname = nickname;
		this.group = group;
	}

	public int getId()
	{
		return id;
	}

	public void setId(int id)
	{
		this.id = id;
	}

	public String getUsername()
	{
		return username;
	}

	public void setUsername(String username)
	{
		this.username = username;
	}

	public String getPassword()
	{
		return password;
	}

	public void setPassword(String password)
	{
		this.password = password;
	}

	public String getNickname()
	{
		return nickname;
	}

	public void setNickname(String nickname)
	{
		this.nickname = nickname;
	}

	public Group getGroup()
	{
		return group;
	}

	public void setGroup(Group group)
	{
		this.group = group;
	}

	@Override
	public String toString()
	{
		return "User [id=" + id + ", username=" + username + ", password="
				+ password + ", nickname=" + nickname + ", group=" + group
				+ "]";
	}

}

4.src/test/java

TestJaxb.java

package org.fool.xml.test;

import java.io.File;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.fool.xml.jaxb.Group;
import org.fool.xml.jaxb.User;
import org.junit.Test;

public class TestJaxb
{
	@Test
	public void testJavaToXML()
	{
		try
		{
			JAXBContext ctx = JAXBContext.newInstance(User.class);
			Marshaller marshaller = ctx.createMarshaller();

			Group group = new Group(1, "Develop");
			User user = new User(1, "JAXB", "JAXB", "XML", group);

			marshaller.marshal(user, new File("jaxb.xml"));
		}
		catch (JAXBException e)
		{
			e.printStackTrace();
		}
	}

	@Test
	public void testXMLtoJava()
	{
		try
		{
			JAXBContext ctx = JAXBContext.newInstance(User.class);
			Unmarshaller unmarshaller = ctx.createUnmarshaller();

			User user = (User) unmarshaller.unmarshal(new File("jaxb.xml"));
			
			System.out.println(user);
		}
		catch (JAXBException e)
		{
			e.printStackTrace();
		}

	}
}

5.Result

testJavaToXML

jaxb.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<user>
	<group>
		<id>1</id>
		<name>Develop</name>
	</group>
	<id>1</id>
	<nickname>XML</nickname>
	<password>JAXB</password>
	<username>JAXB</username>
</user>

testXMLtoJava

console output

User [id=1, username=JAXB, password=JAXB, nickname=XML, group=Group [id=1, name=Develop]]