通向架构师的道路（第十二天）之Axis2 Web Service(三)

xiaoxiao2021-12-13 44

一、SOAPIn Axis2

在前两天的教程中,我们学习到了用Axis2如何进行复杂数据、简单数据进行传输。

正如我在前一天教程中所说，在web service的世界里，一切都是基于SOAP的，因此在今天我们将学习Axis2中的SOAP特性。

今天的课程将用3个例子来完成即：

1）客户端与服务端使用SOAP进行通讯

2）服务端将Exception以SOAPFault的形式抛给客户端

3）使用SWA（Soap With Attachment）来进行附件传送

二、客户端与服务端使用SOAP进行通讯

来看下面这个Web Service：

下面是Service端的源码

org.sky.axis2.soap.SoapService

package org.sky.axis2.soap;

import org.apache.axiom.om.OMAbstractFactory;

import org.apache.axiom.om.OMElement;

import org.apache.axiom.om.OMFactory;

import org.apache.axiom.om.OMNamespace;

import Java.util.*;

public class SoapService {

public static OMElement requestSoap = null;

public OMElement request(OMElement soapBody) {

requestSoap = soapBody;

Iterator it = requestSoap.getChildElements();

OMElement issuerElement = (OMElement) it.next();

OMElement serialElement = (OMElement) it.next();

OMElement revocationDateElement = (OMElement) it.next();

String issuer = issuerElement.getText();

String serial = serialElement.getText();

String revocationDate = revocationDateElement.getText();

System.out.println("issuer=====" + issuer);

System.out.println("serial=====" + serial);

System.out.println("revocationDate=====" + revocationDate);

OMFactory soapFactory = OMAbstractFactory.getOMFactory();

OMNamespace omNs = soapFactory.createOMNamespace(

"http://soap.axis2.sky.org", "");

OMElement soapResponse = soapFactory.createOMElement("SoapResponse",

omNs);

OMElement soapIssuer = soapFactory.createOMElement("Issuer", omNs);

soapIssuer.setText("issuer: " + issuer);

soapResponse.addChild(soapIssuer);

OMElement soapSerial = soapFactory.createOMElement("Serial", omNs);

soapSerial.setText("serial: " + serial);

soapResponse.addChild(soapSerial);

OMElement soapRevokeDate = soapFactory.createOMElement("RevokeDate",

omNs);

soapRevokeDate.setText("RevocationDate: " + revocationDate);

soapResponse.addChild(soapRevokeDate);

soapResponse.build();

return soapResponse;

}

来看它的service.xml的描述

This is the service for revoking certificate.

</description>

org.sky.axis2.soap.SoapService

</parameter>

<messageReceiver

class="org.apache.axis2.receivers.RawXMLINOutMessageReceiver" />

<actionMapping>urn:request</actionMapping>

</operation>

</service>

该Web Service接受一个Soap请求，该请求为如下格式：

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soap="http://soap.axis2.sky.org">

<soapenv:Header/>

<soapenv:Body>

<soap:request>

<soap:request>?</soap:request>

</soap:request>

</soapenv:Body>

</soapenv:Envelope>

其中<soap:request></soap:request>中间的内容，应该如下所示：

</ Response >

我们假设它是一个购买图书的定单，服务端收到这个请求后会返回一个定单信息给调用它的客户端，服务端将返回如下内容（此处不做任何业务处理，只是很简单的传值回客户端）。

<Issuer>issuer: Wrox</Issuer>

<Serial>serial: 1111111111ISBN</Serial>

<RevokeDate>RevocationDate: 2012-07-29</RevokeDate>

</SoapResponse>

为生成上述这个SoapResponse我们在Service端的核心代码如上面加粗部分的代码所示，由其注意这个“soapResponse.build();”。

下面我们来看这个客户端是怎么写的，我们这边用的是非阻塞式客户端

org.sky.axis2.soap.SoapServiceClient

package org.sky.axis2.soap;

import org.apache.axiom.om.OMAbstractFactory;

import org.apache.axiom.om.OMElement;

import org.apache.axiom.om.OMFactory;

import org.apache.axiom.om.OMNamespace;

import org.apache.axis2.AxisFault;

import org.apache.axis2.Constants;

import org.apache.axis2.addressing.EndpointReference;

import org.apache.axis2.client.Options;

import org.apache.axis2.client.ServiceClient;

import org.apache.axis2.client.async.AxisCallback;

import org.apache.axis2.context.MessageContext;

import javax.xml.namespace.QName;

public class SoapServiceClient {

private static EndpointReference targetEPR = new EndpointReference(

"http://localhost:8080/Axis2Service/services/SoapService");

public static boolean finish = false;

public static void orderRequest() {

OMFactory factory = OMAbstractFactory.getOMFactory();

OMNamespace omNs = factory.createOMNamespace(

"http://soap.axis2.sky.org", "");

OMElement issuer = factory.createOMElement("Issuer", omNs);

OMElement serial = factory.createOMElement("Serial", omNs);

OMElement revocationDate = factory.createOMElement("RevocationDate",

omNs);

issuer.setText("Wrox");

serial.setText("1111111111ISBN");

revocationDate.setText("2012-07-29");

OMElement requestSoapMessage = factory.createOMElement("request", omNs);

requestSoapMessage.addChild(issuer);

requestSoapMessage.addChild(serial);

requestSoapMessage.addChild(revocationDate);

requestSoapMessage.build();

Options options = new Options();

options.setTo(targetEPR);

ServiceClient sender = null;

try {

AxisCallback callback = new AxisCallback() {

public void onMessage(MessageContext msgContext) {

OMElement result = msgContext.getEnvelope().getBody()

.getFirstElement();

// System.out.println(msgContext.toString());

// System.out.println(msgContext.getEnvelope().toString());

System.out.println(msgContext.getEnvelope().getBody()

.getFirstElement());

finish = true;

}

public void onFault(MessageContext msgContext) {

System.out.println(msgContext.getEnvelope().getBody()

.getFault().toString());

}

public void onError(Exception e) {

}

public void onComplete() {

System.out.println("Completed!!!");

}

};

sender = new ServiceClient();

sender.setOptions(options);

System.out.println("-------Invoke the service---------");

sender.sendReceiveNonBlocking(requestSoapMessage, callback);

synchronized (callback) {

if (!finish) {

try {

callback.wait(1000);

} catch (Exception e) {

}

if (!finish) {

throw new AxisFault(

"Server was shutdown as the async response take too long to complete");

}

} catch (AxisFault e) {

e.printStackTrace();

} finally {

if (sender != null)

try {

sender.cleanup();

} catch (Exception e) {

}

public static void main(String[] args) {

orderRequest();

}

上述代码和前两天的客户端代码没啥区别，我已经把核心代码用红色给标粗了。

运行后行得到输出

客户端运行后的输出：

服务端的输出：

三、服务端将Exception以SOAPFault的形式抛给客户端

上面这个例子很简单，它展示了一个客户端向服务端发送一个request，服务端接收到客户端的Request(OMElement类型)后解析并根据相应的业务逻辑向客户端再返回一个response(OMElement类型)的完整过程。

下面我们要来看的是，如果客户端在调用服务器时发生任何错误，服务端如何把这个错误经过包装后再返回给客户端的例子。

还记得我们在非阻塞式客户端中有如下这样的触发器吗？

public void onMessage(MessageContext msgContext) {

}

public void onFault(MessageContext msgContext) {

}

public void onError(Exception e) {

}

public void onComplete() {

}

此处的onFault就是用于接受从服务端抛过来的Exception的，我们把它称为SOAPFault。

下面来看一个例子，先来看Service端

org.sky.axis2.soap.SoapFaultService

package org.sky.axis2.soap;

import org.apache.axiom.om.OMAbstractFactory;

import org.apache.axiom.om.OMElement;

import org.apache.axiom.om.OMFactory;

import org.apache.axiom.om.OMNamespace;

import org.apache.axiom.soap.SOAPFactory;

import org.apache.axiom.soap.SOAPFault;

import org.apache.axiom.soap.SOAPFaultCode;

import org.apache.axiom.soap.SOAPFaultReason;

import org.apache.axis2.AxisFault;

import org.apache.axis2.context.MessageContext;

public class SoapFaultService {

private int i = 0;

public OMElement getPrice(OMElement request) throws AxisFault {

if (request == null) {

SOAPFault fault = getSOAPFault();

return fault;

}

OMFactory factory = OMAbstractFactory.getOMFactory();

OMNamespace ns = factory.createOMNamespace("", "");

OMElement response = factory.createOMElement("Price", ns);

response.setText(String.valueOf(i++));

return response;

}

private SOAPFault getSOAPFault() {

MessageContext context = MessageContext.getCurrentMessageContext();

SOAPFactory factory = null;

if (context.isSOAP11()) {

factory = OMAbstractFactory.getSOAP11Factory();

} else {

factory = OMAbstractFactory.getSOAP12Factory();

}

SOAPFault fault = factory.createSOAPFault();

SOAPFaultCode faultCode = factory.createSOAPFaultCode(fault);

faultCode.setText("13");

factory.createSOAPFaultValue(faultCode);

SOAPFaultReason faultReason = factory.createSOAPFaultReason(fault);

faultReason.setText("request can not be null");

factory.createSOAPFaultText(faultReason);

factory.createSOAPFaultDetail(fault);

return fault;

}

注意加粗部分的代码，由其是标成红色的代码为核心代码。

来看Service描述：

Please Type your service description here

</Description>

<parameter name="ServiceClass" locked="false">org.sky.axis2.soap.SoapFaultService

</parameter>

<messageReceiver

class="org.apache.axis2.receivers.RawXMLINOutMessageReceiver" />

<actionMapping>urn:getPrice</actionMapping>

</operation>

</service>

上述这个WebService接受一个输入的参数，如果输入的内容为空，则返回一个SoapFault，即键值为13，内容为” request can not be null”。

我们来看客户端的代码

org.sky.axis2.soap.SoapFaultClient

package org.sky.axis2.soap;

import Java.util.Iterator;

import javax.xml.namespace.QName;

import org.apache.axiom.om.OMAbstractFactory;

import org.apache.axiom.om.OMElement;

import org.apache.axiom.om.OMFactory;

import org.apache.axiom.om.OMNamespace;

import org.apache.axis2.AxisFault;

import org.apache.axis2.Constants;

import org.apache.axis2.addressing.EndpointReference;

import org.apache.axis2.client.Options;

import org.apache.axis2.client.ServiceClient;

import org.apache.axis2.client.async.AxisCallback;

import org.apache.axis2.context.MessageContext;

public class SoapFaultClient {

static boolean finish = false;

public static void main(String[] args) {

EndpointReference epr = new EndpointReference(

"http://localhost:8080/Axis2Service/services/SoapFaultService");

ServiceClient sender = null;

try {

OMFactory factory = OMAbstractFactory.getOMFactory();

OMNamespace ns = factory.createOMNamespace(

"http://soap.axis2.sky.org", "");

OMElement request = factory.createOMElement("Price", ns);

Options options = new Options();

options.setAction("urn:getPrice");

options.setTo(epr);

options.setTransportInProtocol(Constants.TRANSPORT_HTTP);

options.setUseSeparateListener(true);

AxisCallback callback = new AxisCallback() {

public void onMessage(MessageContext msgContext) {

OMElement result = msgContext.getEnvelope().getBody()

.getFirstElement();

OMElement priceElement = result;

System.out.println("price====" + priceElement.getText());

finish = true;

}

public void onFault(MessageContext msgContext) {

QName errorCode = new QName("faultcode");

QName reason = new QName("faultstring");

// System.out.println("on

// fault:"+msgContext.getEnvelope().getBody().getFault().toString());

OMElement fault = msgContext.getEnvelope().getBody()

.getFault();

System.out.println("ErrorCode["

+ fault.getFirstChildWithName(errorCode).getText()

+ "] caused by: "

+ fault.getFirstChildWithName(reason).getText());

}

public void onError(Exception e) {

}

public void onComplete() {

System.out.println("OnComplete!!!");

}

};

sender = new ServiceClient();

sender.setOptions(options);

sender.engageModule("addressing");

try {

// sender.sendReceiveNonBlocking(request, callback);

sender.sendReceiveNonBlocking(null, callback);

} catch (AxisFault e) {

System.out.println("Exception occur!");

System.out.println(e.getMessage());

}

synchronized (callback) {

if (!finish) {

try {

callback.wait(1000);

} catch (Exception e) {

}

} catch (AxisFault e) {

e.printStackTrace();

System.out.println(e.getMessage());

} finally {

try {

sender.cleanup();

} catch (Exception e) {

}

注意红色并加粗部分的代码，为了抓到服务端抛过来的SoapFault我们必须使用非阻塞式，因此我们在onFault处，进行接受服务端错误的处理。

注意：

我们调用Service端时没有传入Service端所需要的request的参数：

// sender.sendReceiveNonBlocking(request,callback);

sender.sendReceiveNonBlocking(null,callback);

这将构成Service端抛出SoapFault。

来看运行效果：

四、使用SWA（Soap WithAttachment）来进行附件传送

有了上面两个例子的基础后，我们将使用这个例子来结束Axis2中的Soap特性的教学。

在Axis2中传输附件有两种形式，一种叫MTOM，一种就是SWA。

SWAP即Soap With Attachment，这是业界的标准。

所谓的SWA传输，即客户端把需要上传的文件，编译成两进制代码凌晨随着soap的request一起推送到服务端，该两进制代码以AttachmentId的形式来表示，即如下这样的一个soap body：

<soapenv:Body>

</uploadFile>

</soapenv:Body>

服务端收到该soap的request可以直接使用如下的语句将这个AttachmentId还原成输出流：

DataHandler dataHandler = attachment.getDataHandler(attchmentID);

File file = new File(uploadFilePath.toString());

fileOutputStream = new FileOutputStream(file);

dataHandler.writeTo(fileOutputStream);

fileOutputStream.flush();

在我们这个例子内，我们将使用客户端上传一个jpg文件，服务端收到该jpg文件（可以是任何的两进制文件）后解析后存入服务端的一个目录。

先来看服务端代码

org.sky.axis2.attachment.FileUploadService

package org.sky.axis2.attachment;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import javax.activation.DataHandler;

import org.apache.axiom.attachments.Attachments;

import org.apache.axis2.context.MessageContext;

import org.sky.axis2.util.UUID;

public class FileUploadService {

public String uploadFile(String name, String attchmentID) throws Exception {

FileOutputStream fileOutputStream = null;

StringBuffer uploadFilePath = new StringBuffer();

String fileNamePrefix = "";

String fileName = "";

try {

MessageContext msgCtx = MessageContext.getCurrentMessageContext();

Attachments attachment = msgCtx.getAttachmentMap();

DataHandler dataHandler = attachment.getDataHandler(attchmentID);

fileNamePrefix = name.substring(name.indexOf("."), name.length());

fileName = UUID.getUUID();

System.out.println("fileName=====" + fileName);

System.out.println("fileNamePrefix====" + fileNamePrefix);

uploadFilePath.append("D:/upload/axis2/");

uploadFilePath.append(fileName);

uploadFilePath.append(fileNamePrefix);

System.out

.println("uploadFilePath====" + uploadFilePath.toString());

File file = new File(uploadFilePath.toString());

fileOutputStream = new FileOutputStream(file);

dataHandler.writeTo(fileOutputStream);

fileOutputStream.flush();

} catch (Exception e) {

throw new Exception(e);

} finally {

try {

if (fileOutputStream != null) {

fileOutputStream.close();

fileOutputStream = null;

}

} catch (Exception e) {

}

return "File saved succesfully.";

}

下面是服务端的描述

service.xml文件的内容为：

<parameter name="ServiceClass">org.sky.axis2.attachment.FileUploadService

</parameter>

<actionMapping>urn:uploadFile</actionMapping>

</operation>

</service>

该服务端接受客户端上传的附件后使用UUID重新命名上传的文件名，并将其存入服务端的” D:/upload/axis2/”目录中。

来看客户端代码

org.sky.axis2.attachment.FileUploadClient

package org.sky.axis2.attachment;

import java.io.File;

import javax.activation.DataHandler;

import javax.activation.FileDataSource;

import javax.xml.namespace.QName;

import org.apache.axiom.om.OMAbstractFactory;

import org.apache.axiom.om.OMElement;

import org.apache.axiom.om.OMNamespace;

import org.apache.axiom.soap.SOAP11Constants;

import org.apache.axiom.soap.SOAPBody;

import org.apache.axiom.soap.SOAPEnvelope;

import org.apache.axiom.soap.SOAPFactory;

import org.apache.axis2.Constants;

import org.apache.axis2.addressing.EndpointReference;

import org.apache.axis2.client.OperationClient;

import org.apache.axis2.client.Options;

import org.apache.axis2.client.ServiceClient;

import org.apache.axis2.context.ConfigurationContext;

import org.apache.axis2.context.ConfigurationContextFactory;

import org.apache.axis2.context.MessageContext;

import org.apache.axis2.wsdl.WSDLConstants;

public class FileUploadClient {

private static EndpointReference targetEPR = new EndpointReference(

"http://localhost:8080/Axis2Service/services/AttachmentService");

public static void main(String[] args) throws Exception {

new FileUploadClient().transferFile();

}

public void transferFile() throws Exception {

String filePath = "D:/deployment/test.jpg";

String destFile = "test.jpg";

Options options = new Options();

options.setTo(targetEPR);

options.setProperty(Constants.Configuration.ENABLE_SWA,

Constants.VALUE_TRUE);

options.setSoapVersionURI(SOAP11Constants.SOAP_ENVELOPE_NAMESPACE_URI);

options.setTimeOutInMilliSeconds(10000);

options.setTo(targetEPR);

options.setAction("urn:uploadFile");

ConfigurationContext configContext = ConfigurationContextFactory

.createConfigurationContextFromFileSystem(

"D:/wspace/Axis2Service/WebContent/WEB-INF/modules",

null);

ServiceClient sender = new ServiceClient(configContext, null);

sender.setOptions(options);

OperationClient mepClient = sender

.createClient(ServiceClient.ANON_OUT_IN_OP);

MessageContext mc = new MessageContext();

FileDataSource fileDataSource = new FileDataSource(new File(filePath));

// Create a dataHandler using the fileDataSource. Any implementation of

// javax.activation.DataSource interface can fit here.

DataHandler dataHandler = new DataHandler(fileDataSource);

String attachmentID = mc.addAttachment(dataHandler);

SOAPFactory fac = OMAbstractFactory.getSOAP11Factory();

SOAPEnvelope env = fac.getDefaultEnvelope();

OMNamespace omNs = fac.createOMNamespace(

"http://attachment.axis2.sky.org", "");

OMElement uploadFile = fac.createOMElement("uploadFile", omNs);

OMElement nameEle = fac.createOMElement("name", omNs);

nameEle.setText(destFile);

OMElement idEle = fac.createOMElement("attchmentID", omNs);

idEle.setText(attachmentID);

uploadFile.addChild(nameEle);

uploadFile.addChild(idEle);

env.getBody().addChild(uploadFile);

System.out.println("message====" + env);

mc.setEnvelope(env);

mepClient.addMessageContext(mc);

mepClient.execute(true);

MessageContext response = mepClient

.getMessageContext(WSDLConstants.MESSAGE_LABEL_IN_VALUE);

SOAPBody body = response.getEnvelope().getBody();

OMElement element = body.getFirstElement().getFirstChildWithName(

new QName("http://attachment.axis2.sky.org", "return"));

System.out.println(element.getText());

}

注意红色加粗部分的代码，由其是：

FileDataSource fileDataSource = new FileDataSource(new File(filePath));

String attachmentID = mc.addAttachment(dataHandler);

这两句就是把客户端需要上传的附件转成AttachmentId的语句，然后把这个AttachementId作为一个OMElement的类型加入到客户端的soap request中去即可：

OMElement idEle = fac.createOMElement("attchmentID", omNs);

idEle.setText(attachmentID);

uploadFile.addChild(nameEle);

uploadFile.addChild(idEle);

env.getBody().addChild(uploadFile);

来看运行效果。

客户端：

上传d:/deployment/test.jpg文件

客户端收到服务端返回的”File saved successfully”即可在服务端的” D:/upload/axis2”目录中查询是否成功上传了该文件了

可以看到，由于我们使用的是UUID因此每次上传，服务端的文件名都不会重复。

附录 UUID.java

package org.sky.axis2.util;

public class UUID {

protected static int count = 0;

public static synchronized String getUUID() {

count++;

long time = System.currentTimeMillis();

String timePattern = Long.toHexString(time);

int leftBit = 14 - timePattern.length();

if (leftBit > 0) {

timePattern = "0000000000".substring(0, leftBit) + timePattern;

}

String uuid = timePattern

+ Long.toHexString(Double.doubleToLongBits(Math.random()))

+ "000000000000000000";

uuid = uuid.substring(0, 32).toUpperCase();

return uuid;

}

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