Terry.Li-彬

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使用Axis2传输附件(AXIS2 MTOM)--2
5．测试
FileTransferClient.java
package sample;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
 
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
 
import org.apache.axiom.attachments.utils.IOUtils;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.OMText;
import org.apache.axiom.soap.SOAP11Constants;
import org.apache.axis2.AxisFault;
import org.apache.axis2.Constants;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.client.Options;
import org.apache.axis2.client.ServiceClient;
 
public class FileTransferClient {
   private static EndpointReference targetEPR =
 new EndpointReference("http://127.0.0.1:8080/axis2/services/FileOperation");
  
   public static boolean upload(String fileName, File file, String fileType) {
     try {
      OMElement data = buildUploadEnvelope(fileName, file, fileType);
      Options options = buildOptions();
      ServiceClient sender = new ServiceClient();
      sender.setOptions(options);
      System.out.println("The data in method upload: "+data);
      OMElement ome = sender.sendReceive(data);
      System.out.println("Convert the data to element in method upload: "+ome);
      String b = ome.getText();
      return Boolean.parseBoolean(b);
     }
     catch(Exception e) {
       e.printStackTrace();
     }
     return false;
   }
  
   public static boolean download(String userName, String fileName, String fileType) {
     try {
       OMElement data = buildDownloadEnvelope(userName, fileName, fileType);
       Options options = buildOptions();
       ServiceClient sender = new ServiceClient();
       sender.setOptions(options);
       System.out.println("The data in method download: "+data);
       OMElement ome = sender.sendReceive(data);
       System.out.println("Convert the data to element in method download: "+ome);
       OMText binaryNode = (OMText) ome.getFirstOMChild();
       binaryNode.setOptimize(true); //必须加此句，否则会出现ContentID is null的异常!
       DataHandler actualDH = (DataHandler) binaryNode.getDataHandler();
       FileOutputStream imageOutStream = new FileOutputStream("D:/userTemp/xx.gif");
       InputStream is = actualDH.getInputStream();
       imageOutStream.write(IOUtils.getStreamAsByteArray(is));
       return true;
      }
      catch(Exception e) {
        e.printStackTrace();
      }
     return false;
   }
  
   private static OMElement buildUploadEnvelope(String fileName, File file, String fileType) {
     DataHandler expectedDH;
     OMFactory fac = OMAbstractFactory.getOMFactory();
     OMNamespace omNs = fac.createOMNamespace("http://example.org/filedata", "fd");
     OMElement data = fac.createOMElement("upload", omNs);
     OMElement fileContent = fac.createOMElement("fileContent", omNs);
     FileDataSource dataSource = new FileDataSource(file);
     expectedDH = new DataHandler(dataSource);
     OMText textData = fac.createOMText(expectedDH, true);
     fileContent.addChild(textData);
     OMElement _fileName = fac.createOMElement("fileName", omNs);
     _fileName.setText(fileName);
     OMElement _fileType = fac.createOMElement("fileType", omNs);
     _fileType.setText(fileType);
     data.addChild(_fileName);
     data.addChild(_fileType);
     data.addChild(fileContent);
     return data;
   }
  
   private static OMElement buildDownloadEnvelope(String userName, String fileName, String fileType) {
     OMFactory fac = OMAbstractFactory.getOMFactory();
     OMNamespace omNs = fac.createOMNamespace("http://example.org/filedata", "fd");
     OMElement data = fac.createOMElement("download", omNs);
     OMElement _userName = fac.createOMElement("userName", omNs);
     _userName.setText(userName);
     OMElement _fileName = fac.createOMElement("fileName", omNs);
     _fileName.setText(fileName);
     OMElement _fileType=fac.createOMElement("fileType", omNs);
     _fileType.setText(fileType);
     data.addChild(_userName);
     data.addChild(_fileName);
     data.addChild(_fileType);
     return data;
   }
   private static Options buildOptions() throws AxisFault {
     Options options = new Options();
     options.setSoapVersionURI(SOAP11Constants.SOAP_ENVELOPE_NAMESPACE_URI);
     options.setTo(targetEPR);
     // enabling MTOM in the client side
     options.setProperty(Constants.Configuration.ENABLE_MTOM, Constants.VALUE_TRUE);
     options.setTransportInProtocol(Constants.TRANSPORT_HTTP);
     return options;
   }
   public static void main(String agrs[]) {
     String file = "D:/userTemp/ya.gif";
     String fn = "testUser";
     String ft="gif";
     boolean rtv = upload(fn,new File(file),ft);
     System.out.println("is upload success: "+rtv);
     String un="zj";
     String downfn="1";
     if(download(un,downfn,ft)){
            System.out.println("download success.");
     }
     else System.out.println("download fail.");
     System.out.println("Client main end.");
   }
}
 
6.结果
察看soap消息，我们可以发现
<fd:upload xmlns:fd="http://example.org/filedata">
<fd:fileName>testUser</fd:fileName>
<fd:fileType>gif</fd:fileType>
<fd:fileContent>RHQMLJJ4/AMZkEBAEAOw（省略部分2进制代码）</fd:fileContent>
</fd:upload>
 
Convert the data to element in method upload:
<fd:response xmlns:fd=http://example.org/filedata xmlns:tns="http://ws.apache.org/axis2">true</fd:response>
 
The data in method download:
<fd:download xmlns:fd="http://example.org/filedata">
<fd:userName>zj</fd:userName>
<fd:fileName>1</fd:fileName>
<fd:fileType>gif</fd:fileType>
</fd:download>
 
Convert the data to element in method download:
<fd:response xmlns:fd="http://example.org/filedata" xmlns:tns="http://ws.apache.org/axis2">
eIqGRwjkQAAAOw==（省略部分2进制代码）
</fd:response>
 
7．代码分析
  利用Axis2的Mtom发送附件应用了builder模式。要向一个webserive 发送请求，首先就要构建一个请求的Envelope,Axis2构建Envelope的时候是利用的Axis2的AXIOM api(就是axis2的java object和xml的映射处理机制),其编程模式和DOM差不多的.看这一段:
private static OMElement buildUploadEnvelope(String mailboxnum, short greetingType, File file, String FileType) {
DataHandler expectedDH;
     OMFactory fac = OMAbstractFactory.getOMFactory();
...
return data;
}
这一段其实是构建的data对像是这样一段xml的java object代表：
<fd:upload xmlns:fd="http://example.org/filedata">
<fd:fileName>testUser</fd:fileName>
<fd:fileType>gif</fd:fileType>
<fd:fileContent>RHQMLJJ4/AMZkEBAEAOw（省略部分2进制代码）</fd:fileContent>
</fd:upload>
其中的Dwvc2VydmljZT4NCjwvZGVwbG95bWVudD4NCg0K是要传送的文件的内容代表，至于什么编码，我没有深究。注意这一句:
OMElement data = fac.createOMElement("upload", omNs);
这里的“upload”参数对应的是webservice的一个操作的名称，这个操作的名称是跟webservice的server端实现类的方法名和services.xml的所定义的
<operationname="upload">
   <actionMapping>urn:upload</actionMapping>
   <messageReceiverclass="org.apache.axis2.receivers.RawXMLINOutMessageReceiver"/>
</operation>
要一致的。
再看看这一段，
 private static Options buildOptions() {
     Options options = new Options();
     ...
     return options;
   }
这里构建的Options对象，顾名思义就是调用webservice的相应的选项：比如这里就指定了Soap协议为1.1 版,指定了所请求的service 的EPR(就是地址)，声明在client应用MTOM指定传输协议为HTTP。
构建好要传送的data和options后,所执行的代码为：
ServiceClient sender = new ServiceClient();
//设定选项
sender.setOptions(options);
//打印要传送的数据，为一段xml
System.out.println(data);
//传送数据，得到返回值
OMElement ome = sender.sendReceive(data);
//打印返回值，为一段xml
System.out.println(ome);
//析取返回值中的数据
String b = ome.getText();
//返回
return Boolean.parseBoolean(b);
可以发现，server端和client的中间传递数据都是通过      org.apache.axiom.om.OMElement对象的，这个对象是一段xml的java 对象映射。
posted on 2008-07-10 16:54 礼物 阅读(812) 评论(0)  编辑  收藏 所属分类: web service

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