java解析xml

<?xml version="1.0" encoding="UTF-8"?>
<mimetype>
    <default>
    <mime-type>text/html</mime-type>
    </default>
    <mime-mapping>
        <extension>zip</extension>
        <mime-type>application/zip</mime-type>
    </mime-mapping>
    <mime-mapping>
        <extension>xml</extension>
        <mime-type>text/xml</mime-type>
    </mime-mapping>
</mimetype>                

1. SAXReader

    public static void main(String[] args) throws FileNotFoundException, UnsupportedEncodingException, DocumentException {
        //流式读取
        File file = new File("mimetype.xml");
        Document doc = new SAXReader().read(file);
        Element mimetype = doc.getRootElement();
        System.out.println("根元素名：" + mimetype.getName());
        Element defaultElement = mimetype.element("default");
        System.out.println("默认元素的mime-type：" + defaultElement.elementText("mime-type"));
        List<Element> mime_mappings = mimetype.elements("mime-mapping");
        System.out.println("元素集合的数据：" + mime_mappings.size());
    }

这是读文件的，好像直接读字符串还不怎么方便。

String xml = "<?xml version="1.0" encoding="UTF-8"?><mimetype></mimetype>";
Reader reader = new StringReader(xml);
Document doc = new SAXReader().read(reader);

以Reader为桥梁来读取String类型的xml  2016-03-12 13:00:27

2. JAXB

@XmlRootElement(name="user")
public class User {
    public String name = "ken";
    public int age = 24;
    
    public static void main(String[] args) throws Exception {
        JAXBContext jaxbContext = JAXBContext.newInstance(User.class);  
        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();  
        User m = new User();
        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);  //有缩进
        jaxbMarshaller.marshal(m, System.out);  
        String xml = "<?xml version="1.0" encoding="UTF-8" standalone="yes"?><user><name>ken</name><age>24</age></user>";
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        User m2 = (User) unmarshaller.unmarshal(new StringReader(xml));
        System.out.println("我的名字：" + m2.name);
    }
}

简单类型的解析与序列化  2016-03-12 17:48:55

@XmlRootElement(name="user")
public class User {
	public String name = "ken";
	public int age = 24;
	public Address address = new Address();
	public static class Address{
		public String name = "永州";
	}
}

  <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  <user>
    <name>ken</name>
    <age>24</age>
    <address>
        <name>永州</name>
    </address>
  </user>

@XmlRootElement(name="user")
public class User {
    public String name = "ken";
    public int age = 24;
    @XmlElementWrapper(name="list")  
    public List<Address> address;
    public static class Address{
        public String name = "永州";
        public Address(String name){
            this.name = name;
        }
    }
}

  <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  <user>
    <name>ken</name>
    <age>24</age>
    <list>
      <address>
          <name>永州</name>
      </address>
      <address>
          <name>广州</name>
      </address>
    </list>
  </user>