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还是直接上代码：
WebServices.tml:
<!DOCTYPE html>
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd"
xmlns:p="tapestry:parameter">
<head>
<meta charset="UTF-8" />
<title>学习Tapestry5.3.8</title>
<link rel="stylesheet" type="text/css"
href="${context:css/examples/examples.css}" />
</head>
<body>
<h1>Web Services</h1>
Here we have a link to a Tapestry page that acts as a REST-like web
service.
<br />
<br />
<div class="eg">
<a t:type="pagelink" t:page="ws/PersonFind" t:context="literal:1"
href="#">PersonFind/1</a>
</div>
</body>
</html>
WebServices.java:
public class WebServices {
}
然后页面就长成这死样子了：
PersonFind.java （向Tapestry页面输出对象了）:
/**
* @package ：com.changhongit.andy.pages.ws<br>
* @author ：wanglongjie<br>
* @createDate ：2015年9月16日下午2:41:16<br>
*/
package com.changhongit.andy.pages.ws;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.http.HttpServletResponse;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import org.apache.tapestry5.StreamResponse;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.Response;
import com.changhongit.andy.dao.PeopleDao;
import com.changhongit.andy.entity.People;
import com.changhongit.andy.entity.ws.WsPeople;
/**
* @package ：com.changhongit.andy.pages.ws<br>
* @file ：PersonFind.java<br>
* @describe ：<br>
* @author ：wanglongjie<br>
* @createDate ：2015年9月16日下午2:41:16<br>
* @updater ：<br>
* @updateDate ：<br>
* @updateContent ：<br>
*/
public class PersonFind {
@Inject
private PeopleDao peopleDao;
Object onActivate(final Long personId) {
System.out.println("onActivate..." + personId);
return new StreamResponse() {
private InputStream inputStream;
@Override
public void prepareResponse(Response response) {
// TODO Auto-generated method stub
WsPeople wsPeople = findPerson(personId);
if (wsPeople == null) {
try {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
"Resource not found");
} catch (IOException e) {
// TODO: handle exception
throw new RuntimeException("failed to redirect?", e);
}
} else {
try {
JAXBContext context = JAXBContext.newInstance(wsPeople
.getClass());
Marshaller marshaller = context.createMarshaller();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
marshaller.marshal(wsPeople, outputStream);
inputStream = new ByteArrayInputStream(
outputStream.toByteArray());
response.setHeader("Content-Length",
outputStream.size() + "");
} catch (JAXBException e) {
// TODO: handle exception
throw new IllegalStateException("write failure!", e);
}
}
}
@Override
public InputStream getStream() throws IOException {
// TODO Auto-generated method stub
return inputStream;
}
@Override
public String getContentType() {
// TODO Auto-generated method stub
return "text/xml";
}
};
}
public WsPeople findPerson(Long personId) {
WsPeople wsPeople = null;
People people = peopleDao.findById(personId);
System.out.println(people);
if (people != null) {
wsPeople = new WsPeople(people.getId(), people.getName(),
people.getAge(), people.getBirthday(), people.getGender(),
people.getHobby());
}
return wsPeople;
}
}
依赖转化为XML的实体类 WsPerson.java , 这家伙不能放在pages目录下，不然他会“挂掉的”
/**
* @package ：example.crud.entity<br>
* @author ：wanglongjie<br>
* @createDate ：2015年8月17日上午9:26:32<br>
*/
package com.changhongit.andy.entity.ws;
import java.io.Serializable;
import java.util.Date;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
/**
* @package ：example.crud.entity<br>
* @file ：People.java<br>
* @describe ：用户 实体类<br>
* @author ：wanglongjie<br>
* @createDate ：2015年8月17日上午9:26:32<br>
* @updater ：<br>
* @updateDate ：<br>
* @updateContent ：<br>
*/
@SuppressWarnings("serial")
@XmlRootElement(name = "people")
@XmlAccessorType(XmlAccessType.FIELD)
public class WsPeople implements Serializable {
/**
* ID 好
*/
@XmlAttribute(name = "id")
private Long id;
/**
* 姓名
*/
private String name;
/**
* 年龄
*/
private int age;
/**
* 生日
*/
private Date birthday;
/**
* 性别
*/
private String gender;
/**
* 兴趣爱好
*/
private String hobby;
public WsPeople() {
}
public WsPeople(Long id, String name, int age, Date birthday,
String gender, String hobby) {
this.id = id;
this.name = name;
this.age = age;
this.birthday = birthday;
this.gender = gender;
this.hobby = hobby;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getHobby() {
return hobby;
}
public void setHobby(String hobby) {
this.hobby = hobby;
}
@Override
public String toString() {
return "People [id=" + id + ", name=" + name + ", age=" + age
+ ", birthday=" + birthday + ", gender=" + gender + ", hobby="
+ hobby + "]";
}
}
通过注解，这家伙已经百毒不侵了，可以轻松的转化为XML文件。
点击页面上的“PersonFind/1“，跳转到PersonFind 页面，内容如下所示：
就此，Tapestry 就创建了一个标准的 as a REST-like web service.
********************************************************************************************************
重点来了，正如上边所说：WsPerson.java 如果放在pages包下，就会报异常错误：Class com.changhongit.andy.pages.ws.WsPeople has been transformed and may not be directly instantiated. 
说这个类已经被转化不能直接实例化，这大概就是为什么Tapestry的页面类都要放在pages包下，肯定是已经做过一些处理，至于怎么处理的，抱歉我也没看过过源码！
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原文地址：http://my.oschina.net/andy1989/blog/506900
