JAX-B 示例

在基于SOAP协议的Web服务中，基于Document绑定样式的服务需要用的哦啊wsgen工具产生的绑定到XML模式类型的Java类型

而wsgen工具用到了JAX-B

这个Person类被注解为一个@XmlType,Skier类被注解为一个@XmlRootElement,这两个注解都是用来说明Java到XML的绑定

package eg.jaxb;

import javax.xml.bind.annotation.XmlType;

@XmlType
public class Person {

	private String name;
	private int age;
	private String gender;

	public Person() {
	}

	public Person(String name, int age, String gender) {
		this.name = name;
		this.age = age;
		this.gender = gender;
	}

	public int getAge() {
		return age;
	}

	public String getGender() {
		return gender;
	}

	public String getName() {
		return name;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public void setGender(String gender) {
		this.gender = gender;
	}

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

}

package eg.jaxb;

import java.util.Collection;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Skier {

	private Person person;
	private String national_team;
	private Collection major_archivements;

	public Skier() {
	}

	public Skier(Person person, String national_team,
			Collection major_archivements) {
		this.person = person;
		this.national_team = national_team;
		this.major_archivements = major_archivements;
	}

	public Collection getMajor_archivements() {
		return major_archivements;
	}

	public String getNational_team() {
		return national_team;
	}

	public Person getPerson() {
		return person;
	}

	public void setMajor_archivements(Collection major_archivements) {
		this.major_archivements = major_archivements;
	}

	public void setNational_team(String national_team) {
		this.national_team = national_team;
	}

	public void setPerson(Person person) {
		this.person = person;
	}
}

Marshal演示了Marshaling(编码)/Unmarshaling(解码)的过程

package eg.jaxb;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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

public class Marshal {

	private static final String file_name = "bd.xml";// 源程序是file_name = "bd.mar"
 

	public static void main(String[] args) {
		new Marshal().run_example();
	}

	private void run_example() {
		try {
			JAXBContext ctx = JAXBContext.newInstance(Skier.class);
			Marshaller m = ctx.createMarshaller();
			m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

			// // Marshal a Skier object: 1st to stdout,2nd to file
			Skier skier = createSkier();
			m.marshal(skier, System.out);

			FileOutputStream out = new FileOutputStream(file_name);
			m.marshal(skier, out);
			out.close();

			// Unmarshal as proof of concept
			Unmarshaller u = ctx.createUnmarshaller();
			Skier bd_clone = (Skier) u.unmarshal(new File(file_name));
			System.out.println("--------------");
			m.marshal(bd_clone, System.out);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	private Skier createSkier() {
		Person bd = new Person("Bjoern Daehlie", 41, "Male");
		List list = new ArrayList();
		list.add("12 Olympic Medals");
		list.add("9 World Championships");
		list.add("Winningest Winter Olympian");
		list.add("Greatest Nordic Skier");
		return new Skier(bd, "Norway", list);
	}
}

以上代码来自《Java消息服务》

下面说明一下Marshaling（编码）与wsgen的关系了

这是一个用wsgen工具生成的Java类，生成GetTimeAsElapsedResponse 所用类在附件

package ch02.ts.jaxws;


import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;


@XmlRootElement(name = "getTimeAsElapsedResponse", namespace = "http://ts.ch02/")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "getTimeAsElapsedResponse", namespace = "http://ts.ch02/")
public class GetTimeAsElapsedResponse {


    @XmlElement(name = "return", namespace = "")
    private long _return;


    /**
     * 
     * @return
     *     returns long
     */
    public long get_return() {
        return this._return;
    }


    /**
     * 
     * @param _return
     *     the value for the _return property
     */
    public void set_return(long _return) {
        this._return = _return;
    }


}

这个类中@XmlType注解的name属性设置为 " getTimeAsElapsedResponse"，这就是客户端调用getTimeAsElapsed服务操作时由Web服务端返回给客户端的SOAP消息名称。这就是返回的SOAP:

HTTP/1.1 200 OK
Transfer-encoding: chunked
Content-type: text/xml;charset="utf-8"

5e

   
      
         
8d

            
               1359292481466
            
         
      
0

这是上面SOAP消息的Request：

POST /ts HTTP/1.1
Content-type: text/xml;charset="utf-8"
Soapaction: ""
Accept: text/xml, multipart/related, text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
User-Agent: JAX-WS RI 2.1.6 in JDK 6
Host: 127.0.0.1:4567
Connection: keep-alive
Content-Length: 167


   
      
         
            
         
      

下面用JAX-B将用wsgen工具生成的Java类GetTimeAsElapsedResponse.java进行Marshaling(编码)并在控制台输出

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

import ch02.ts.jaxws.GetTimeAsElapsedResponse;

public class MarshalGTER {

	public static void main(String[] args) {
		new MarshalGTER().run_example();
	}

	private void run_example() {
		try {
			JAXBContext ctx = JAXBContext
					.newInstance(GetTimeAsElapsedResponse.class);
			Marshaller m = ctx.createMarshaller();
			m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
			GetTimeAsElapsedResponse tr = new GetTimeAsElapsedResponse();
			tr.set_return(new java.util.Date().getTime());
			m.marshal(tr, System.out);
		} catch (PropertyException e) {
			e.printStackTrace();
		} catch (JAXBException e) {
			e.printStackTrace();
		}
	}

}

输出结果：

    1359312314440

可以看到所有导入的命名空间URI是一样的。使用JAX-B，Java类型实例可以编码为XML文档实例，反之这些XML文档也可以解码为Java类型或其他语言类型。

JAX-B对与JAVA和XSD类型间的转换提供底层支持。