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JAXB XML到java object的转换

2024-07-16 11:22:32   215人阅读

JAXB是Java Architecture for XML Binding的缩写。使用JAXB注解将Java对象转换成XML文件。在这篇教程中，我们将会展示如何使用JAXB来做以下事情：

1. marshall 将java对象转化成xml文件

2. unmarshalling 将xml内容转换成java对象

JAXB 注解(Annotation)

如果一个对象需要被转换成XML文件，或者从XML文件中生成，该对象需要用JAXB注解来标注。这些注解光凭名字就知道是什么意思了。具体可参考官网：jaxb guide

package com.jaxb.core; import javax.xml.bind.annotation.XmlAttribute;import javax.xml.bind.annotation.XmlElement;import javax.xml.bind.annotation.XmlRootElement; @XmlRootElementpublic class Customer {     String name;    int age;    int id;     public String getName() {        return name;    }     @XmlElement    public void setName(String name) {        this.name = name;    }     public int getAge() {        return age;    }     @XmlElement    public void setAge(int age) {        this.age = age;    }     public int getId() {        return id;    }     @XmlAttribute    public void setId(int id) {        this.id = id;    } }

 

对象转换成XML

JAXB marshalling例子，将customer对象转换成XML文件。jaxbMarshaller.marshal()包含了许多重载方法，哪个输出符合你的要求就选择哪个方法。

package com.jaxb.core; import java.io.File;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Marshaller; public class JAXBExample {    public static void main(String[] args) {       Customer customer = new Customer();      customer.setId(100);      customer.setName("benson");      customer.setAge(23);       try {         File file = new File("C:\\file.xml");        JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();         // output pretty printed        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);         jaxbMarshaller.marshal(customer, file);        jaxbMarshaller.marshal(customer, System.out);           } catch (JAXBException e) {        e.printStackTrace();          }     }}

输出：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><customer id="100">    <age>23</age>    <name>benson</name></customer>

XML转换成对象：

JAXB unmarshalling例子，将XML文件内容转换成customer对象。jaxbMarshaller.unmarshal()包含了许多重载方法，哪个适合你的输出，你就选择哪个方法。

package com.jaxb.core; import java.io.File;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Unmarshaller; public class JAXBExample {    public static void main(String[] args) {      try {         File file = new File("C:\\file.xml");        JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);         Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();        Customer customer = (Customer) jaxbUnmarshaller.unmarshal(file);        System.out.println(customer);       } catch (JAXBException e) {        e.printStackTrace();      }     }}

 


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