axis2 大附件下载问题

问题描述：使用axis2 下载附件，超过20m，配置了客户端附件缓存，但是没有起作用，直接导致内存溢出，上传没有问题，已通过测试。请哪位达人指点迷津~~~~~~~~~~~~~~~~~代码来源于网上的一个上传、下载实例，修改了上传部分对大文件的支持，但是下载还是不行，上代码
Server：
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public class FileTransferServer {
       public static final String TMP_PATH = "D:/temp";       public OMElement upload(OMElement element) throws Exception {
              OMElement _fileContent = null;//文件内容
              OMElement _fileName = null;//文件名
              OMElement _fileType = null;//文件类型
              //System.out.println("The element for upload: " + element);
              for (Iterator _iterator = element.getChildElements(); _iterator
                            .hasNext();) {
                     OMElement _ele = (OMElement) _iterator.next();
                     if (_ele.getLocalName().equalsIgnoreCase("fileContent")) {
                            _fileContent = _ele;
                     }
                     if (_ele.getLocalName().equalsIgnoreCase("fileName")) {
                            _fileName = _ele;
                     }
                     if (_ele.getLocalName().equalsIgnoreCase("fileType")) {
                            _fileType = _ele;
                     }
              }              if (_fileContent == null || _fileType == null) {
                     throw new AxisFault("Either Image or FileName is null");
              }              OMText binaryNode = (OMText) _fileContent.getFirstOMChild();
              String fileName = _fileName.getText();
              String fileType = _fileType.getText();
              String storeDir = TMP_PATH + "/" + "tempTest";
              File dir = new File(storeDir);
              if (!dir.exists()) {
                     dir.mkdir();
              }
              String filePath = storeDir + "/" + fileName + "." + fileType;
              File uploadFile = new File(filePath);
              if (uploadFile.exists()) {
                     filePath = storeDir + "/" + fileName + "(1)" + "." + fileType;
                     uploadFile = new File(filePath);
              }              // Extracting the data and saving
              DataHandler actualDH;
              actualDH = (DataHandler) binaryNode.getDataHandler();              FileOutputStream imageOutStream = new FileOutputStream(uploadFile);
              //add by wangx 20090625 支持大文件上传，避免不能读数据
              actualDH.writeTo(imageOutStream);
              //删除该段代码，支持大文件上传
              //InputStream is = actualDH.getInputStream();
              //imageOutStream.write(IOUtils.getStreamAsByteArray(is));
              // setting response
              OMFactory fac = OMAbstractFactory.getOMFactory();
              OMNamespace ns = fac.createOMNamespace("http://example.org/filedata",
                            "fd");
              OMElement ele = fac.createOMElement("response", ns);
              ele.setText("true");
              return ele;
       }       public OMElement download(OMElement element) throws Exception {
              //System.out.println("The element for download: " + element);
              OMElement _userName = null;
              OMElement _fileName = null;
              OMElement _fileType = null;
              for (Iterator _iterator = element.getChildElements(); _iterator
                            .hasNext();) {
                     OMElement _ele = (OMElement) _iterator.next();
                     if (_ele.getLocalName().equalsIgnoreCase("userName")) {
                            _userName = _ele;
                     }
                     if (_ele.getLocalName().equalsIgnoreCase("fileName")) {
                            _fileName = _ele;
                     }
                     if (_ele.getLocalName().equalsIgnoreCase("fileType")) {
                            _fileType = _ele;
                     }
              }
              String userName = _userName.getText();
              String fileName = _fileName.getText();
              String fileType = _fileType.getText();
              String filePath = TMP_PATH + "/" + userName + "/" + fileName + "."
                            + fileType;
              //System.out.println("The filePath for download: " + filePath);
              FileDataSource dataSource = new FileDataSource(filePath);
              DataHandler expectedDH = new DataHandler(dataSource);
              OMFactory fac = OMAbstractFactory.getOMFactory();
              OMNamespace ns = fac.createOMNamespace("http://example.org/filedata",
                            "fd");
              OMText textData = fac.createOMText(expectedDH, true);
              OMElement ele = fac.createOMElement("response", ns);
              ele.addChild(textData);
              return ele;
       }
}-------------------------------------------------------------------------------------------------
client：
public class FileTransferClient {
   private static EndpointReference targetEPR =
new EndpointReference("http://localhost:8080/282WebServiceTest/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();
       options.setProperty(Constants.Configuration.CACHE_ATTACHMENTS,Constants.VALUE_TRUE);
       options.setProperty(Constants.Configuration.ATTACHMENT_TEMP_DIR,"D:/temp");
       options.setProperty(Constants.Configuration.FILE_SIZE_THRESHOLD, "4000");
       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:/temp/xx.xml");
       actualDH.writeTo(imageOutStream);
       imageOutStream.close();
       /*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:/3.xml";
     String fn = "testUser";
     String ft="xml";
    // boolean rtv = upload(fn,new File(file),ft);
     //System.out.println("is upload success: "+rtv);
     String un="tempTest";
     String downfn="testUser(1)";
     if(download(un,downfn,ft)){
            System.out.println("download success.");
     }
     else System.out.println("download fail.");
     System.out.println("Client main end.");
   }
}-------------------------------------------------------------------------------------
先行谢过~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~