九、WebService中文件传输

WebService处理传递普通的信息，还可以传输文件，下面介绍WebService是怎么完成文件传输的。

1、 首先编写服务器端上传文件的WebService方法

代码

   
   

    
    
    
    package
    
     com.hoo.service;


    
    import
    
     java.io.File;

    
    import
    
     java.io.FileNotFoundException;

    
    import
    
     java.io.FileOutputStream;

    
    import
    
     java.io.InputStream;

    
    import
    
     javax.activation.DataHandler;


    
    /**
    
    
 * <b>function:</b>Axis WebService完成文件上传服务器端
 * 
    
    @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 {
 
 
    
    /**
    
    
 * <b>function:</b>传递文件
 * 
    
    @author
    
     hoojo
 * @createDate Dec 18, 2010 1:27:58 PM
 * 
    
    @param
    
     handler DataHandler这个参数必须
 * 
    
    @param
    
     fileName 文件名称
 * 
    
    @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)) 
    
    >
    
     
    
    0
    
    ) {
 fos.write(buff, 
    
    0
    
    , len);
 }
 } 
    
    catch
    
    (FileNotFoundException e) {
 
    
    return
    
     
    
    "
    
    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:
    
    "
    
     
    
    +
    
     file.getAbsolutePath();
 } 
    
    else
    
     {
 
    
    return
    
     
    
    "
    
    handler is null
    
    "
    
    ;
 }
 } 
    
    else
    
     {
 
    
    return
    
     
    
    "
    
    fileName is null
    
    "
    
    ;
 }
 }
}

   
   

 

 

上传方法和我们以前在Web中上传唯一不同的就是参数一DataHandler，可以将这类看成文件传输器，他可以把文件序列化。然后通过DataHandler可以得到一个输入流InputStream，通过这个流可以读到文件的内容。其他的操作和普通上传类似。

2、 定制wsdd发布文件上传的WebService服务

 

代码

   
   

    
    
    
    <?
    
    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"
    
    >
    
    
 
    
    <
    
    service 
    
    name
    
    ="UploadFile"
    
     provider
    
    ="java:RPC"
    
    >
    
    
 
    
    <
    
    parameter 
    
    name
    
    ="className"
    
     value
    
    ="com.hoo.service.UploadFileService"
    
     
    
    />
    
    
 
    
    <
    
    parameter 
    
    name
    
    ="allowedMethods"
    
     value
    
    ="*"
    
     
    
    />
    
    
 
    
    <
    
    parameter 
    
    name
    
    ="scope"
    
     value
    
    ="Session"
    
     
    
    />
    
    
 
    
    <!--
    
     和服务器端上传文件的方法签名对应，参数也对应 
    
    -->
    
    
 
    
    <
    
    operation 
    
    name
    
    ="upload"
    
     qname
    
    ="operNS:upload"
    
     xmlns:operNS
    
    ="upload"
    
     returnType
    
    ="rns:string"
    
    
 xmlns:rns
    
    ="http://www.w3.org/2001/XMLSchema"
    
    >
    
    
 
    
    <
    
    parameter 
    
    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
    
    ="org.apache.axis.encoding.ser.JAFDataHandlerSerializerFactory"
    
     deserializer
    
    ="org.apache.axis.encoding.ser.JAFDataHandlerDeserializerFactory"
    
     encodingStyle
    
    ="http://schemas.xmlsoap.org/soap/encoding/"
    
    />
    
    
 
    
    </
    
    service
    
    >
    
    

    
    </
    
    deployment
    
    >
    
    

   
   

 

 

上面才xml节点元素在前面都见过了，说明下operation中的参数，注意要指定参数类型，特别是DataHandler的类型，然后就是typeMapping的serializer、deserializer的序列化和反序列化工厂类的配置。

3、 用dos命令发布当前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

发布完成后，可以通过这个地址查看uploadFile这个service了

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

4、 编写客户端代码

 

代码

   
   

    
    
    
    

    
    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.axis.encoding.ser.JAFDataHandlerSerializerFactory;


    
    /**
    
    
 * <b>function:</b>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
    
     QName(
    
    "
    
    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.println(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.