axis設置和讀取Header

這不一教學示例，但是可以共享我學習中使用簡單Axis Handler(有點類似於ASP.NET soap擴展).我寫2個程序——一個基於java控制檯程序樣式的簡單Web service客戶端和一個Web service。在這個客戶端中調用Web service的方法Test(),調用同時添加了一個包含一個用戶名和密碼的SOAP header。這個Web service擁有一個簡單的Handler，在部署描述符中定義爲一個request Handler，檢查每個請求並且保證用戶名和密碼正確地存在於SOAP header中。當Web service方法獲得它的時候，這個Handler也設置有效用戶名在ThreadLocal variable中。如果請求沒有包含正確的SOAP header，用戶名及密碼，那麼將不能夠連接Web service。

Handler類可以通過幾種方式設置數據並被Web service的方法獲取，其中我知道的一種方法是使用ThreadLocals，雖然它備受爭議，但是我認爲它可能在這種特殊情況裏有用。

我使用的Axis版本是使1.3，我不認爲您也是使用這個版本。注意這是測試碼，不爲產品測試。如果您在代碼裏發現某些事情有錯誤，我非常希望您能告訴我。另外要注意的是我建立SOAP header和使用XML namespace的方式有點草率。我知道它可以做得更好，但是我的目的是測試那些handler代碼:)

注意到這些Web服務的客戶端代碼是從WSDL自動生成，所以我並不擔心怎麼在這裏貼出代碼。

First, the client code:

package test;

import org.apache.axis.message.*;

public class MyClient {

 public static void main(String[] args) {
  
  System.out.println("Hello, this is the client!");
  
  MyServiceServiceLocator wsloc = new MyServiceServiceLocator();
  
  SOAPHeaderElement oHeaderElement; 
  javax.xml.soap.SOAPElement oElement;
  MyServiceSoapBindingStub ws;
  
   try {
    ws = (MyServiceSoapBindingStub)wsloc.getMyService();

    oHeaderElement = new SOAPHeaderElement("http://test",
     "securityHeader");
    oHeaderElement.setPrefix("sec"); 
    oHeaderElement.setMustUnderstand(false);
    oElement = oHeaderElement.addChildElement("username"); 
    oElement.addTextNode("johan"); 
    oElement = oHeaderElement.addChildElement("password"); 
    oElement.addTextNode("secret"); 
      
    ws.setHeader(oHeaderElement);
    System.out.println(ws.test());
   } catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }  
 }
}

Then, the web service code (most comments and javadoc removed):

package test.service;

import test.service.handler.MyHandler;

public class MyService 
{
 public String test()
 {
  String username = MyHandler.getUsername();
  MyHandler.setUsername(null); //clean up
  
  return "Hello from Service! User is = " + username;
 }
}

Finally, the Handler code looks something like this:

package test.service.handler;

import org.apache.axis.AxisFault;
import org.apache.axis.Message;
import org.apache.axis.MessageContext;
import org.apache.axis.handlers.BasicHandler;

import java.util.Iterator;

import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPHeader;
import javax.xml.soap.SOAPHeaderElement;

import org.apache.axis.message.SOAPEnvelope;

/**
 * Simple Axis handler which looks for a SOAP header
 * containing two elements - username and password. Invoke() method 
 * checks these
 * 
 * @author Johan Danforth
 */
public class MyHandler extends BasicHandler {

 private static final long serialVersionUID = 1L;
 private static ThreadLocal _username = new ThreadLocal();

    public static String getUsername() {
        return ((String) (_username.get())).toString();
    }
    
    public static void setUsername(String value) {
        _username.set(value);
    }
 
 /**
  * Method called by Axis handler, checks SOAP header with 
  * username and password.
  * 
  * @throws AxisFault if header is missing or invalid or wrong username or password
  */
 public void invoke(MessageContext msgContext) throws AxisFault {

  boolean processedHeader = false;
  
  try {
   Message msg = msgContext.getRequestMessage();
   SOAPEnvelope envelope = msg.getSOAPEnvelope();
   SOAPHeader header = envelope.getHeader();
   Iterator it = header.examineAllHeaderElements();
   SOAPHeaderElement hel;
   
   while (it.hasNext()) {
    hel = (SOAPHeaderElement) it.next();
    String headerName = hel.getNodeName();
    if(headerName.equals("sec:securityHeader"))
    {
     checkUsername(hel);
     processedHeader = true;
    }
   }
  } catch (SOAPException e) {
   //capture and wrap any exception. 
   throw new AxisFault("Failed to retrieve the SOAP Header or it's details properly.", e);
  }

  if(!processedHeader)
   throw new AxisFault("Failed to retrieve the SOAP Header");
  
 }

 private void checkUsername(SOAPHeaderElement hel) throws AxisFault {
  String username = getUsername(hel);
  String password = getPassword(hel);
  
  if(!(username.equals("johan") && password.equals("secret")))
  {
   throw new AxisFault("Access Denied");
  }
  else
  {
   //set username as threadlocal variable
   _username.set(username);
  }
 }

 private String getPassword(SOAPHeaderElement hel) throws AxisFault {
  org.w3c.dom.Node passwordNode = hel.getLastChild();
  String nodename = passwordNode.getNodeName(); 
  if(!nodename.equals("sec:password"))
   throw new AxisFault("Missing password element in SOAP header.");
  String password = passwordNode.getFirstChild().getNodeValue();
  System.out.println("password = " + password);
  return password;
 }

 private String getUsername(SOAPHeaderElement hel) throws AxisFault {
  org.w3c.dom.Node usernameNode = hel.getFirstChild();
  String nodename = usernameNode.getNodeName(); 
  if(!nodename.equals("sec:username"))
   throw new AxisFault("Missing username element in SOAP header.");
  String username = usernameNode.getFirstChild().getNodeValue();
  System.out.println("username = " + username);
  return username;
 }
}

我必須貼出部署描述和Web.xml的內容。我在同一個Web應用程序中運行Axis Servlets。它有助於您在實際情況中使用您更喜歡的方式。我認爲當我使用Eclipse的最新的版本時，這種方法更容易使用。在web.xml中充滿Axis資源的原因是我使用單獨的server-config.wsdd來代替通過Axis管理工具註冊服務來指示一個單獨的deploy.wsdd文件。我也附上一個deploy.wsdd文件示例，以防萬一有人不熟悉服務器配置文件。

My web.xml looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 <display-name>
 HelloWorld2</display-name>
 <servlet>
  <display-name>
  Apache-Axis Servlet</display-name>
  <servlet-name>AxisServlet</servlet-name>
  <servlet-class>
  org.apache.axis.transport.http.AxisServlet</servlet-class>
 </servlet>
 <servlet>
  <display-name>
  Axis Admin Servlet</display-name>
  <servlet-name>AdminServlet</servlet-name>
  <servlet-class>
  org.apache.axis.transport.http.AdminServlet</servlet-class>
  <load-on-startup>100</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>AxisServlet</servlet-name>
  <url-pattern>/servlet/AxisServlet</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>AxisServlet</servlet-name>
  <url-pattern>*.jws</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>AxisServlet</servlet-name>
  <url-pattern>/services/*</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>AdminServlet</servlet-name>
  <url-pattern>/servlet/AdminServlet</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.html</welcome-file>
  <welcome-file>index.htm</welcome-file>
  <welcome-file>index.jsp</welcome-file>
  <welcome-file>default.html</welcome-file>
  <welcome-file>default.htm</welcome-file>
  <welcome-file>default.jsp</welcome-file>
 </welcome-file-list>
</web-app>

My server-config.wsdd looks like this:

<?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">
 <globalConfiguration>
  <parameter name="sendMultiRefs" value="true"/>
  <parameter name="disablePrettyXML" value="true"/>
  <parameter name="adminPassword" value="admin"/>
  <parameter name="attachments.Directory" value="C:\Java\eclipse\workspace\HelloWorld2\.deployables\HelloWorld2\WEB-INF\attachments"/>
  <parameter name="dotNetSoapEncFix" value="true"/>
  <parameter name="enableNamespacePrefixOptimization" value="true"/>
  <parameter name="sendXMLDeclaration" value="true"/>
  <parameter name="sendXsiTypes" value="true"/>
  <parameter name="attachments.implementation" value="org.apache.axis.attachments.AttachmentsImpl"/>
  <requestFlow>
   <handler type="java:org.apache.axis.handlers.JWSHandler">
    <parameter name="scope" value="session"/>
   </handler>
   <handler type="java:org.apache.axis.handlers.JWSHandler">
    <parameter name="scope" value="request"/>
    <parameter name="extension" value=".jwr"/>
   </handler>
  </requestFlow>
 </globalConfiguration>
 <handler name="LocalResponder" type="java:org.apache.axis.transport.local.LocalResponder"/>
 <handler name="URLMapper" type="java:org.apache.axis.handlers.http.URLMapper"/>
 <handler name="Authenticate" type="java:org.apache.axis.handlers.SimpleAuthenticationHandler"/>
 <service name="AdminService" provider="java:MSG">
  <parameter name="allowedMethods" value="AdminService"/>
  <parameter name="enableRemoteAdmin" value="true"/>
  <parameter name="className" value="org.apache.axis.utils.Admin"/>
  <namespace>http://xml.apache.org/axis/wsdd/</namespace>
 </service>
 <service name="Version" provider="java:RPC">
  <parameter name="allowedMethods" value="getVersion"/>
  <parameter name="className" value="org.apache.axis.Version"/>
 </service>
 <service name="MyService" provider="java:RPC" style="wrapped" use="literal">
  <operation name="test" qname="ns3:test" returnQName="ns3:testReturn" returnType="xsd:string" soapAction="" xmlns:ns3="http://test" xmlns:xsd="http://www.w3.org/2001/XMLSchema"/>
  <parameter name="allowedMethods" value="test"/>
  <requestFlow>
   <handler type="java:test.service.handler.MyHandler">
    </handler>
  </requestFlow>
  <parameter name="typeMappingVersion" value="1.2"/>
  <parameter name="wsdlPortType" value="MyService"/>
  <parameter name="className" value="test.service.MyService"/>
  <parameter name="wsdlServicePort" value="MyService"/>
  <parameter name="schemaQualified" value="http://test"/>
  <parameter name="wsdlTargetNamespace" value="http://test"/>
  <parameter name="wsdlServiceElement" value="MyServiceService"/>
 </service>
 <transport name="http">
  <requestFlow>
   <handler type="URLMapper"/>
   <handler type="java:org.apache.axis.handlers.http.HTTPAuthHandler"/>
  </requestFlow>
  <parameter name="qs:list" value="org.apache.axis.transport.http.QSListHandler"/>
  <parameter name="qs:wsdl" value="org.apache.axis.transport.http.QSWSDLHandler"/>
  <parameter name="qs.list" value="org.apache.axis.transport.http.QSListHandler"/>
  <parameter name="qs.method" value="org.apache.axis.transport.http.QSMethodHandler"/>
  <parameter name="qs:method" value="org.apache.axis.transport.http.QSMethodHandler"/>
  <parameter name="qs.wsdl" value="org.apache.axis.transport.http.QSWSDLHandler"/>
 </transport>
 <transport name="local">
  <responseFlow>
   <handler type="LocalResponder"/>
  </responseFlow>
 </transport>
</deployment>

A sample deploy.wsdd could look like this:

<?xml version="1.0" encoding="UTF-8"?>
<!-- Use this file to deploy some handlers/chains and services      -->
<!-- Two ways to do this:                                           -->
<!--   java org.apache.axis.client.AdminClient deploy.wsdd          -->
<!--      after the axis server is running                          -->
<!-- or                                                             -->
<!--   java org.apache.axis.utils.Admin client|server deploy.wsdd   -->
<!--      from the same directory that the Axis engine runs         -->
<deployment xmlns="http://xml.apache.org/axis/wsdd/" xmlns:java="http://xml.apache.org/axis/wsdd/providers/java">

  <service name="MyService" provider="java:RPC" style="wrapped" use="literal">
      <parameter name="wsdlTargetNamespace" value="http://test"/>
      <parameter name="wsdlServiceElement" value="MyServiceService"/>
      <parameter name="schemaQualified" value="http://test"/>
      <parameter name="wsdlServicePort" value="MyService"/>
      <parameter name="className" value="test.service.MyService"/>
      <parameter name="wsdlPortType" value="MyService"/>
      <parameter name="typeMappingVersion" value="1.2"/>
      <operation xmlns:operNS="http://test" xmlns:retNS="http://test" xmlns:rtns="http://www.w3.org/2001/XMLSchema" name="test" qname="operNS:test" returnQName="retNS:testReturn" returnType="rtns:string" soapAction="">
      </operation>
      <parameter name="allowedMethods" value="test"/>
  <requestFlow>
   <handler type="java:test.service.handler.MyHandler">
    </handler>
  </requestFlow>
  </service>
</deployment>

轉自：http://www.cnblogs.com/liguiqing/archive/2007/10/22/933585.html

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