利用axis创建webservice实现文件传输

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

package com.hoo.service;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import javax.activation.DataHandler;

/**
?* axis WebService完成文件上传服务器端
?*/
public class UploadFileService {

??? 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,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，在WEB-INF/目录下创建deploy.wsdd文件，文件内容如下：

<?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。这里的deploy.wsdd是我们刚才定制的wsdd文件，java当然是jvm的命令，-Djava.ext.dirs=lib设置当前命令的依赖包，AdminClient是axis提供的工具类，这个类本来是可以在官方的工程中admin可以直接运行的（这里不可以，下载下来的少了AdminServlet，有兴趣的可以研究下，就是前面说的官方的示例）；

3、 用dos命令发布当前WebService C:apache-tomcat-5.5.26webappsaxisWEB-INF>java -Djava.ext.dirs=lib org.apache.axis.client.AdminClient -lhttp://localhost:8080/axis/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/axis/servlet/AxisServlet 4、 编写客户端代码 ? 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; /** ?* 上传文件WebService客户端 ?*/ 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",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); ??? } }