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您的位置:技术专栏 / Java专栏
JAVA6开发WebService (二)——JAX-WS
 
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 org.duke.jaxws.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;

    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 Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public DataHandler getImageData() {
        return imageData;
    }

    public void setImageData(DataHandler imageData) {
        this.imageData = imageData;
    }

}
     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 org.duke.jaxws.server;

import javax.jws.WebParam;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import javax.xml.ws.soap.MTOM;

@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:

package org.duke.jaxws.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;

@WebService(serviceName = "Hello", portName = "HelloPort", targetNamespace = "http://server.jaxws.duke.org/", endpointInterface = "org.duke.jaxws.server.Hello")
public class HelloImpl implements 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 ("duke".equals(customer.getName())) {
            customer.setId(1);
            try {
                customer.setBirthday(new SimpleDateFormat("yyyy-MM-dd")
                        .parse("1985-03-14"));
            } catch (ParseException e) {
                e.printStackTrace();
            }
            customer.setImageData(new DataHandler(new FileDataSource(new File(
                    "c:" + File.separator + "duke.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:

package org.duke.jaxws.server;

import javax.xml.ws.Endpoint;

public class SoapServer {
    public static void main(String[] args) {
        Endpoint.publish("http://localhost:8080/Service/Hello", new HelloImpl());
    }
}
在命令行键入“wsimport -s src -p org.duke.jaxws.client -keep http://localhost:8080/Service/Hello?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 org.duke.jaxws.test;

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;

import org.duke.jaxws.client.Customer;
import org.duke.jaxws.client.Hello;
import org.duke.jaxws.client.Hello_Service;

public class SoapClient {
    public static void main(String[] args) throws ParseException,
            MalformedURLException {
        QName qName = new QName("http://server.jaxws.duke.org/", "Hello");
        Hello_Service helloService = new Hello_Service(new URL(
                "http://localhost:8080/Service/Hello?wsdl"), qName);
        Hello hello = (Hello) helloService.getPort(Hello.class);

        hello.printContext();

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

        Customer customer = new Customer();
        customer.setName("duke");
        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:\\Shawn\\duke-real_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("duke");
        GregorianCalendar calendar = (GregorianCalendar) GregorianCalendar
                .getInstance();
        calendar.setTime(new SimpleDateFormat("yyyy-MM-dd").parse("1985-03-14"));
        try {
            c1.setBirthday(DatatypeFactory.newInstance()
                    .newXMLGregorianCalendar(calendar));
        } catch (DatatypeConfigurationException e) {
            e.printStackTrace();
        }
        c1.setImageData(new DataHandler(new FileDataSource(
                "c:\\Shawn\\duke1.jpg")));

        Customer c2 = new Customer();
        c2.setId(2);
        c2.setName("abc");
        calendar.setTime(new SimpleDateFormat("yyyy-MM-dd").parse("1986-03-14"));
        try {
            c2.setBirthday(DatatypeFactory.newInstance()
                    .newXMLGregorianCalendar(calendar));
        } catch (DatatypeConfigurationException e) {
            e.printStackTrace();
        }
        c2.setImageData(new DataHandler(new FileDataSource(
                "c:\\Shawn\\duke-real_temp.jpg")));

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

    }
}

 

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