在axis中實現附件上傳

通過SOAP傳送文件,最簡單的方式就是將數據先進行Base64編碼,這對於數據量小的文件來說是一個不錯的解決方案,同時實現起來也比較方便.然後Base64編碼有其侷限性,經過編碼後的數據要比原文多1/3的數據量,如果數據量較大的話,就要仔細斟酌一下了.
當然也可以考慮採用其他的傳輸協議,如FTP,這樣就要考慮其他方面的問題,如防火牆等安全設置,系統之間的協調.
目前通過SOAP傳送附件的標準有SWA(SOAP with Attachement,proposed by Microsoft and HP Labs),DIME(proposed by Microsoft)
Apache Axis目前兩種標準都支持,通過SOAP傳送附件,不但需要Axis的核心類庫,還需要activation.jar和mail.jar,這兩個jar用來支持Java MIME.沒有這兩個jar時,Axis可以正常工作,但不支持附件,使用時會報出 Attachment not support的異常.

Axis1.4發佈在tomcat5.0.28上,Web服務服務器端程序:

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

import javax.activation.DataHandler;
import javax.activation.FileDataSource;

import org.apache.log4j.Logger;

public class FileService{
static Logger logger = Logger.getLogger(FileService.class.getName());
public static String Repository="../uploads/";
public String putFile(DataHandler dh,String name){
   if(name==null)
       name="test.tmp";
       logger.debug("文件名爲空，設置文件名");
   try{
    File dir=new File(Repository);
    if(!dir.exists()){
         dir.mkdir();
         logger.debug("附件存放目錄爲空，創建 uploads 目錄");
      }
    InputStream input=dh.getInputStream();
    FileOutputStream fos=new FileOutputStream(new File(dir,name));
    byte[] buffer=new byte[1024*4];
    int n=0;
    while((n=input.read(buffer))!=-1){
     fos.write(buffer,0,n);
     }
    input.close();
    fos.close();
   }catch(IOException e){
    e.printStackTrace();
   }
return name+"send OK";
}
public DataHandler getFile(String name){
File dir=new File(Repository);
if(!dir.exists())
dir.mkdir();
File data=new File(dir,name);
if(data.exists())
         return new DataHandler(new FileDataSource(data));
else
         return null;
}
}

部署描述文件:

客戶端測試程序:

文件上傳

public PutFile(String fileName) {
this.fileName = fileName;
}

public boolean doPut() {
return doPut(fileName);
}

public static boolean doPut(String fileName) {
  String name = GenerateFileName();
  try {
   Service service = new Service();
   Call call = (Call) service.createCall();
   DataHandler dh = new DataHandler(new FileDataSource(fileName));
   call.setTargetEndpointAddress(new java.net.URL(endpoint));
   call.setOperationName(new QName(endpoint, "putFile"));
   QName qnameattachment = new QName("FileService", "DataHandler");
   call.registerTypeMapping(dh.getClass(), qnameattachment,
     JAFDataHandlerSerializerFactory.class,
     JAFDataHandlerDeserializerFactory.class);
   call.addParameter("s1", qnameattachment, ParameterMode.IN);
   call.addParameter("s2", XMLType.XSD_STRING, ParameterMode.IN);
   call.setReturnType(XMLType.XSD_STRING);
   String uploadedFN = (String) call.invoke(new Object[] { dh, name });
   if (uploadedFN != null && uploadedFN.trim().length() > 0) {
    return true;
   }
  } catch (Exception e) {
   logger.error("調用文件上傳Web服務出錯：" + e.getMessage());
   return false;
  }
  return false;
}

文件下載：

public GetFile(String fileName) {
this.fileName = fileName;
}

public boolean doGet() {
return doGet(fileName);
}

public static boolean doGet(String fileName) {
  InputStreamReader ins = null;
  BufferedReader br = null;
  FileWriter fw = null;

  try {
   Service service = new Service();
   Call call = (Call) service.createCall();
   DataHandler dh = new DataHandler(new FileDataSource(fileName));
   call.setTargetEndpointAddress(new java.net.URL(endpoint));
   call.setOperationName(new QName(endpoint, "getFile"));
   QName qnameattachment = new QName("FileService", "DataHandler");
   call.registerTypeMapping(dh.getClass(), qnameattachment,
     JAFDataHandlerSerializerFactory.class,
     JAFDataHandlerDeserializerFactory.class);
   call.addParameter("s1", qnameattachment, ParameterMode.IN);

   call.setReturnType(new QName("FileService", "DataHandler"),DataHandler.class);
   DataHandler ret = (DataHandler) call.invoke(new Object[] { fileName });
   ins = new InputStreamReader(ret.getInputStream());
   br = new BufferedReader(ins);
    File dir=new File("DownLoadFile");
       if(!dir.exists()){
            dir.mkdir();
            logger.debug("下載文件存放目錄不存在，創建【"+dir.getAbsolutePath()+" 】目錄");
         }
   File f = new File(dir,fileName+"_reply");
   fw = new FileWriter(f);
   String tmp = br.readLine();
   while(tmp!=null){
    fw.write(tmp+"/n");
    tmp = br.readLine();
   }
  } catch (Exception e) {
   logger.error("調用文件下載Web服務出錯：" + e.getMessage());
   return false;
  }finally{
   try{
    br.close();
    ins.close();
    fw.close();
   }catch(Exception ee){

   }
  }
  return false;
}

需要注意的地方:

在服務器端和客戶端需要配置好相應的Classpath,在classpath中需要增加兩個jar:activation.jar和mail.jar.同時,如果你將tomcat的日誌登記調整到info或者debug,在部署這個Web服務時中間會拋出一些異常信息,這是正常情況,在axis.jar中,程序在JAFDataHandlerDeserializerFactory.create方法沒有找到時,會有兩外的處理方式,這只是作爲一個Debug信息輸出.