java成神之——jaxb操作xml的基本使用

Posted 2021-01-11 叶家伟的博客

• JAXB
  • 依赖
  • 读取xml配置
  • 写配置
  • 自定义写配置
• 结语

JAXB

依赖

<dependency>
    <groupId>javax.activation</groupId>
    <artifactId>activation</artifactId>
    <version>1.1.1</version>
</dependency>

<dependency>
    <groupId>javax.xml</groupId>
    <artifactId>jaxb-impl</artifactId>
    <version>2.1</version>
</dependency> 

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.0</version>
</dependency>

读取xml配置

User类
@XmlRootElement
public class User{
    private Integer id;
    private String name;
    // gettters and setters
}

xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<user>
    <id>1</id>
    <name>叶</name>
</user>

获取配置
User user = JAXB.unmarshal(new File("C:\Users\26401\Desktop\demo.xml"), User.class);

写配置

User user = new User();
user.setName("小叶");
user.setId(2);
JAXB.marshal(user, new File("C:\Users\26401\Desktop\demo.xml"));

结果
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<user>
    <id>2</id>
    <name>小叶</name>
</user>

自定义写配置

@XmlAccessorType(XmlAccessType.NONE) 
public class User{

    @XmlElement
    private Integer id;

    @XmlElement(name="username")
    private String name;

    @XmlAttribute
    private String nameDescribe;

    @XmlTransient
    private Integer age;

    @XmlElement
    public Integer getPassAge() {
        return age;
    }

    public void setPassAge(Integer val) {} 

    public User(){}

    public User(Integer id, String name, String nameDescribe, Integer age) {
        this.id = id;
        this.name = name;
        this.nameDescribe = nameDescribe;
        this.age = age;
    }
}

写数据
User user = new User(1, "叶家伟", "用户姓名", 18);
JAXB.marshal(user, new File("C:\Users\26401\Desktop\demo.xml"));

结果
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<user nameDescribe="用户姓名">
    <id>1</id>
    <username>叶家伟</username>
    <passAge>18</passAge>
</user>

结语

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