File transmission in WebService

WebService processes and transmits ordinary information, and can also transmit files, as follows Introduce how WebService completes file transfer.

1. First, write a WebService method for uploading files on the server side

 
 package  com.hoo.service;  import  java.io.File;  import  java.io.FileNotFoundException;  import  java.io.FileOutputStream;  import span>  java.io.InputStream;  import span>  javax.activation.DataHandler;  / **  * function: Axis WebService completes file upload server side*  @author  hoojo * @createDate Dec 18, 2010 1:16:16 PM * @file UploadFileService.java * @package com.hoo.service * @project AxisWebService * @blog  http://blog.csdn.net/IBM_hoojo  * @email [email protected] *  @version  1.0  */   public   class  UploadFileService { /**  * function: Transfer files*  @author  hoojo * @createDate Dec 18, 2010 1:27:58 PM *  @param < span style="color:rgb(0,128,0); line-height:1.5!important"> The parameter handler DataHandler must be *  @param  fileName file name*  @return  upload Info  */   public  String upload(DataHandler handler, String fileName) { if  (fileName  !=   null   &&   ! "" .equals(fileName)) {File file  =    new File(fileName);  if  (handler  !=   null ) {InputStream is  =   null ; FileOutputStream fos  =   null ;  try  {is  =  handler.getInputStream(); fos  =   new  FileOutputStream(file);  byte [] buff  =   new   byte [ 1024   *   8 ];  int  len  =   0 ;  while  ((len  =  is.read(buff))  >   < span style="line-height:1.5!important">0 ) {fos.write(buff,  0 , len);}}  catch (FileNotFoundException e) { return   " < span style="line-height:1.5!important">fileNotFound " ;}  catch  ( Exception e) { return   " upload File failure " ;}  finally  { try  { if  (fos  !=   null ) {fos.flush(); fos.close();}   if  (is  !=   null ) {is.close(); }}  catch  (Exception e) {e.printStackTrace();}}  return   " file absolute path: span> "   +  file.getAbsolutePath();}  e lse  { return span>   " handler is null " ;}}  else  { return   " fileName is null " ;}}}  

The only difference between the upload method and our previous upload on the Web is the parameter DataHandler, which can be regarded as a file transfer device, which can serialize files. Then an input stream InputStream can be obtained through the DataHandler, and the content of the file can be read through this stream. Other operations are similar to normal upload.

2. Customize the WebService service of wsdd publishing file upload

 
  xml version="1.0" encoding= "UTF-8" ?>   < deployment  xmlns ="http://xml.apache.org/axis/wsdd/"  xmlns:java ="http://xml.apache.org/axis/wsdd/providers/java" >   << /span> service  name ="UploadFile"  provider ="java :RPC" >   < parameter  name  ="className"  value ="com.hoo.service.UploadFileService" span>   />   < parameter  name ="allowedMethods"  value ="*"  < /span> />   < parameter  name ="scope"  value ="Session"   />      < operation  name ="upload"  qname ="operNS:upload"  xmlns:operNS ="upload"  returnType = "rns:string"  xmlns:rns ="http://www.w3.org/2001/XMLSchema" >   < parameter  < span style="color:rgb(255,0,0); line-height:1.5!important">name ="handler"  type ="ns:DataHandler"  xmlns: ns ="http://www.w3.org/2001/XMLSchema" />   < parameter  name ="fileName"  type ="ns:string"  xmlns:ns ="http://www.w3. org/2001/XMLSchema" />    operation >   < typeMapping  qname ="hns:DataHandler"  xmlns:hns ="ns: FileUploadHandler"  languageSpecificType ="java:javax.activation.DataHandler"  serializer< /span> ="org.apache.axis.encoding.ser.JAFDataHandlerSerializerFactory"  deserializer ="org.apache.axis.encoding.ser.JAFDataHandlerDeserializerFactory"  encodingStyle = "http://schemas.xmlsoap.org/soap/encoding/" /> < span style="line-height:1.5!important">   service >     deployment >   

The above xml node element has been seen before, explain the parameters in the operation, pay attention to specify the parameter type, especially the type of DataHandler, and then the serialization and deserialization factory class configuration of the serializer and deserializer of typeMapping .

3. Use the dos command to publish the current WebService

C:\SoftWare\tomcat-5.0.28\tomcat-5.0.28\webapps\AxisWebService\WEB-INF>java -Djava.ext.dirs=lib org.apache.axis.client.AdminClient -lhttp://localhost: 8080/AxisWebService/services/AdminService deployUpload.wsdd

After publishing, you can view the uploadFile service through this address

http://localhost:8080/AxisWebService/servlet/AxisServlet

4 , Write client code

 
   package  com.hoo.client;  import  java.rmi.RemoteException;  import  javax.activation.DataHandler;  import  javax.activation. FileDataSource;  import  javax. xml.namespace.QName;  import  javax.xml.rpc.ParameterMode;  import  javax.xml.rpc.ServiceException;  import                 org.apache.axis.client.Call;                import                org.apache.axis.client.Service;                import                org.apache.axis.encoding.XMLType;                import                org.apache.axis.encoding.ser.JAFDataHandlerDeserializerFactory;                import                org.apache.ax is.encoding.ser.JAFDataHandlerSerializerFactory;                /**                * function:上传文件WebService客户端 * *                @author                hoojo * @createDate Dec 18, 2010 1:38:14 PM * @file UploadFileClient.java * @package com.hoo.client * @project AxisWebService * @blog                http://blog.csdn.net/IBM_hoojo                * @email [email protected] *                @version                1.0                */                               public                               class                UploadFileClient {                public                               static                               void                main(String[] args)                throws                ServiceException, RemoteException { String url                =                               "               http://localhost:8080/AxisWebService/services/UploadFile               "               ; String fileName                =                               "               readMe.txt               "               ; String path                =                System.getProperty(               "               user.dir               "               )                +                               "               \\WebRoot\\               "                               +                fileName; System.out.println(path);                //               这样就相当于构造了一个带文件路径的File了                                DataHandler handler                =                               new                DataHandler(               new                FileDataSource(path)); Service service                =                               new                Service(); Call call                =                (Call) service.createCall(); call.setTargetEndpointAddress(url);                /**                * 注册异常类信息和序列化类 ns:FileUploadHandler 和 wsdd 配置文件中的typeMapping中的xmlns:hns="ns:FileUploadHandler" 的对应 DataHandler * 和 wsdd 配置文件中的typeMapping中的qname="hns:DataHandler"的DataHandler对应                */                QName qn                =                               new                QN ame(               "               ns:FileUploadHandler               "               ,                "               DataHandler               "               ); call.registerTypeMapping(DataHandler.               class               , qn, JAFDataHandlerSerializerFactory.               class               , JAFDataHandlerDeserializerFactory.               class               ); call.setOperationName(               new                QName(url,                "               upload               "               ));                //               设置方法形参，注意的是参数1的type的DataHandler类型的，和上面的qn的类型是一样的                                call.addParameter(               "               handler               "               , qn, ParameterMode.IN); call.addParameter(               "               fileName               "               , XMLType.XSD_STRING, ParameterMode.IN);                //               设置返回值类型，下面2种方法都可以                                call.setReturnClass(String.               class               );                //               call.setReturnType(XMLType.XSD_STRING);                                String result                =                (String) call.invoke(               new                Object[] { handler,                "               remote_server_readMe.txt               "                }); System.out.pri ntln(result); } }             

 

 

至此，文件传输就完成了。怎么样，还不错吧！

如果你用myEclipse进行开发的话，运行时可能会出现以下的错误:

Exception in thread “main” java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream

原因是jar包版本不统一,解决方法如下:

删除Java EE 5 Libraries/javaee.jar/mail里的包有东西.

具体方法如下:

用rar打开X:/Program Files/MyEclipse 6.0/myeclipse/eclipse/plugins/com.genuitec.eclipse.j2eedt.core_6.0.1.zmyeclipse601200710/data/libraryset/EE_5/javaee.jar,然后删除mail,一切就ok了.