JAVA6开发WebService (二)——JAX-WS例子

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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:

 

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:

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)@MTOMpublic 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:

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 HelloImpl implements Hello {@Resourceprivate WebServiceContext context;@Overridepublic 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");}}}@Overridepublic 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;}@Overridepublic 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:

package com.why.server;import javax.xml.ws.Endpoint;/** *  * @author why * */public class SoapServer {public static void 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:

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 static void 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。


转载自:http://wuhongyu.iteye.com/blog/807836

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