JAVA6开发WebService （二）——JAX-WS例子

上一篇写了个最简单的小例子，只是为了说明JAVA6开发Web Service很方便，这一篇稍微深入一点，写个稍微有点代表性的小例子。

依然使用 JAX-WS（jdk自带的实现）方式，这次要在服务中使用一个复杂类型Customer，并实现附件传输的功能，这里使用MTOM的附件传输方式。MTOM（SOAP Message Transmission Optimization Mechanism）是SOAP 消息传输优化机制，MTOM可以在SOAP 消息中发送二进制数据。

先来看Customer类：

[java]
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package com.why.server;

import java.util.Date;

import javax.activation.DataHandler;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlMimeType;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name ="Customer")

@XmlAccessorType(XmlAccessType.FIELD)
public class Customer {
private long id;
private String name;
private Date birthday;

@XmlMimeType("application/octet-stream")
private DataHandler imageData;

//getter and setter
......
}

MTOM 方式中要传输的附件必须使用javax.activation.DataHandler 类，还要注意必须在类上使用@XmlAccessorType(FIELD)注解，标注JAXB 在进行JAVA 对象与XML 之间进行转换时只关注字段，而不关注属性（getXXX()方法），否则发布Web 服务时会报出现了两个imageData 属性的错误，原因未知，可能是BUG。

然后使用@XmlMimeType 注解标注这是一个附件类型的数据，这里我们标注imageData 是一个二进制文件，当然你也可以使用具体的MIME类型，譬如：image/jpg、image/gif 等，但要考虑到客户端是否支持。

接口类：

[java]
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package com.why.server;

import javax.jws.WebParam;
import javax.jws.WebService;

import javax.xml.ws.soap.MTOM;

/**
*
* @author why
*
*/
@WebService(name="Hello")
@SOAPBinding(style = SOAPBinding.Style.RPC)
@MTOM
public interface Hello {
public void printContext();
public Customer selectCustomerByName(@WebParam(name ="customer")Customer customer);

public Customer selectMaxAgeCustomer(Customer c1, Customer c2);
}

         

@MTOM注解用于开启MTOM功能。

@WebService注解中的name属性标注在接口类上，可以指定wsdl中接口名称，也就是生成的客户端代码中接口类的名字。

@SOAPBinding(style = SOAPBinding.Style.RPC)指定SOAP消息样式，有两个枚举值：SOAPBinding.Style.DOCUMENT（默认）和SOAPBinding.Style.RPC，可以对比这两种方式生成的wsdl会有所不同，而且生成的客户端代码也会有所不同。

实现类：

[java]
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package com.why.server;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import java.io.OutputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import java.util.Set;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.annotation.Resource;
import javax.jws.WebService;
import javax.xml.ws.WebServiceContext;
import javax.xml.ws.handler.MessageContext;

/**
*
* @author why
*
*/
@WebService(serviceName="HelloService",portName="HelloServicePort",targetNamespace="http://service.why.com/",endpointInterface="com.why.server.Hello")
public class HelloImplimplements Hello {

@Resource

private WebServiceContext context;

@Override
public void printContext(){
MessageContext ctx = context.getMessageContext();
Set<String> set = ctx.keySet();
for (String key : set) {

System.out.println("{" + key +"," + ctx.get(key) +"}");
try {
System.out.println("key.scope=" + ctx.getScope(key));
} catch (Exception e) {

System.out.println(key + " is not exits");
}
}
}

@Override
public Customer selectCustomerByName(Customer customer) {
if("why".equals(customer.getName())){
customer.setId(1);
try {
customer.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse("1985-10-07"));
} catch (ParseException e) {

e.printStackTrace();
}
customer.setImageData(new DataHandler(new FileDataSource(new File("c:"+
File.separator + "why.jpg"))));

}else{
customer.setId(2);
customer.setBirthday(new Date());
customer.setImageData(new DataHandler(new FileDataSource(new File("c:"+
File.separator + "origin.jpg"))));

}
return customer;

}

@Override
public Customer selectMaxAgeCustomer(Customer c1, Customer c2) {
try {
// 输出接收到的附件
System.out.println("c1.getImageData().getContentType()=" + c1.getImageData().getContentType());
InputStream is = c2.getImageData().getInputStream();

OutputStream os = new FileOutputStream("c:\\temp1.jpg");
byte[] bytes =
new byte[1024];
int c;
while ((c = is.read(bytes)) != -1) {
os.write(bytes, 0, c);

}
os.close();

System.out.println("c2.getImageData().getContentType()=" + c2.getImageData().getContentType());
is = c2.getImageData().getInputStream();
os = new FileOutputStream("c:\\temp2.jpg");
bytes = new
byte[1024];
while ((c = is.read(bytes)) != -1) {
os.write(bytes, 0, c);
}
os.close();
} catch (IOException e) {

e.printStackTrace();
}

if (c1.getBirthday().getTime() > c2.getBirthday().getTime()){
return c2;

}
else{
return c1;
}
}
}

@WebService注解的serviceName属性指定wsdl中service节点的name属性值。portName属性指定wsdl中service节点下port节点name属性值。targetNamespace属性指定wsdl根节点definitions的targetNamespace属性值。endpointInterface属性指定要发布的WebService接口的全路径名，当实现类实现了多个接口时，需要通过此属性标注哪个类是WebService的服务端点接口（SEI）。

在这个类中，通过@Resource注解注入了一个WebServiceContext对象，这个对象即是WebService的上下文环境。

发布这个服务：

[java]
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package com.why.server;

import javax.xml.ws.Endpoint;

/**
*
* @author why
*
*/
public class SoapServer {
public staticvoid main(String[] args) {

Endpoint.publish("http://localhost:8080/helloService",new HelloImpl());
}
}

在命令行键入“wsimport -p com.why.client -keep http://localhost:8080/helloService?wsdl”生成客户端代码，拷贝到工程相应文件夹里，这时，就可以调用这个服务了：
[java]
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package com.why.client;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.GregorianCalendar;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.namespace.QName;

/**
*
* @author why
*
*/
public class SoapClient {
public staticvoid main(String[] args)
throws ParseException, MalformedURLException {
QName qName = new QName("http://service.why.com/","HelloService");
HelloService helloService = new HelloService(new URL("http://127.0.0.1:8080/helloService?wsdl"),qName);
Hello hello = (Hello) helloService.getPort(Hello.class);

hello.printContext();

System.out.println("---------------------------------------------------");

Customer customer = new Customer();
customer.setName("why");

DataSource ds = hello.selectCustomerByName(customer).getImageData().getDataSource();
String attachmentMimeType = ds.getContentType();
System.out.println(attachmentMimeType);
try {
InputStream is = ds.getInputStream();
OutputStream os = new FileOutputStream("c:\\why_temp.jpg");
byte[] bytes =
new byte[1024];
int c;
while ((c = is.read(bytes)) != -1) {
os.write(bytes, 0, c);

}
} catch (IOException e) {

e.printStackTrace();
}

System.out.println("########################################");

Customer c1 = new Customer();
c1.setId(1);

c1.setName("why");
GregorianCalendar calendar = (GregorianCalendar)GregorianCalendar.getInstance();
calendar.setTime(new SimpleDateFormat("yyyy-MM-dd").parse("1985-10-07"));
try {
c1.setBirthday(DatatypeFactory.newInstance().newXMLGregorianCalendar(calendar));
} catch (DatatypeConfigurationException e) {
e.printStackTrace();
}
c1.setImageData(new DataHandler(new FileDataSource("c:\\c1.jpg")));

Customer c2 = new Customer();
c2.setId(2);

c2.setName("abc");
calendar.setTime(new SimpleDateFormat("yyyy-MM-dd").parse("1986-10-07"));
try {
c2.setBirthday(DatatypeFactory.newInstance().newXMLGregorianCalendar(calendar));
} catch (DatatypeConfigurationException e) {
e.printStackTrace();
}
c2.setImageData(new DataHandler(new FileDataSource("c:\\c2.jpg")));

Customer c = hello.selectMaxAgeCustomer(c1,c2);
System.out.println(c.getName());

}
}

附件是我的工程，当然运行这个程序，需先在C盘建立几个文件c1.jpg、c2.jpg、origin.jpg和why.jpg。