使用 J-Interop 在 Java 中调用WMI

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使用 J-Interop 在 Java 中调用WMI

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发表于:2011-06-16 07:12

有关WMI的小知识

Windows管理规范（WMI）是微软对来自分布式管理任务组（DMTF）的基于Web的企业管理（WBEM）和通用信息模型（CIM）标准的实现。WMI用于访问Windows系统、应用、网络、设备等组件，并管理它们。连接到一台机器通过DCOM进行管理。因此，有关DCOM的小知识将有助于本文的理解。你可以到MSDN了解有关WMI的更多细节。

J-Interop

市场上有一些在使用 JAVA 调用 WMI的好库，包括 J-Interop、JACOB-Project 和 J-Integra。其中，我更喜欢J-Interop，因为它是完全免费和开源的API。它提供了没有任何依赖的纯DCOM桥，完全用Java编写的没有任何JNI代码。

使用WMI管理Windows服务

现在，来看一个使用JAVA调用WMI的例子。这个例子利用J-Interop的API使用Win32_Service类解释WMI操作，将启动和停止在这个例子中的窗口服务。

步骤1：连接到WBEM服务

下面的代码示例显示了使用J-Interop如何初始化DCOM会话，并连接到远程DCOM服务使。它使用SWbemLocator对象连接到SWbemServices，SWbemServices对象提供对本地或远程计算机WMI的访问，它调用“ConnectServer”方法连接到SWbemServices。在本例中，提供管理员级别的用户连接到远程计算机。

JISessiondcomSession=JISession.createSession(domainName,userName,password);

dcomSession.useSessionSecurity(false);

JIComServercomServer=newJIComServer(valueOf("WbemScripting.SWbemLocator"),hostIP,dcomSession);

IJIDispatchwbemLocator=(IJIDispatch)narrowObject(comServer.createInstance().queryInterface(IID));

//parameterstoconnecttoWbemScripting.SWbemLocator

Object[]params=newObject[]{

                          newJIString(hostIP),//strServer

                          newJIString(win32_namespace),//strNamespace

                          JIVariant.OPTIONAL_PARAM(),//strUser

                          JIVariant.OPTIONAL_PARAM(),//strPassword

                          JIVariant.OPTIONAL_PARAM(),//strLocale

                          JIVariant.OPTIONAL_PARAM(),//strAuthority

                          newInteger(0),//iSecurityFlags

                          JIVariant.OPTIONAL_PARAM()//objwbemNamedValueSet

                          };

JIVariantresults[]=wbemLocator.callMethodA("ConnectServer",params);

IJIDispatchwbemServices=(IJIDispatch)narrowObject(results[0].getObjectAsComObject());

（domainName=远程计算机域名，hostIP=远程计算机IP地址,用户名=管理员级别的用户，密码=密码）

第2步：获取Win32_Service实例

一旦你获得对SWbemServices对象的引用，就可以调用这个类的任何方法。其中WbemServices.InstancesOf方法获得任何Win32类的实例。

也可以使用WMI查询语言(WQL)达到同样的目的，如下所示：

finalintRETURN_IMMEDIATE=0x10;

finalintFORWARD_ONLY=0x20;

Object[]params=newObject[]{

newJIString("SELECT*FROMWin32_Service"),

JIVariant.OPTIONAL_PARAM(),

newJIVariant(newInteger(RETURN_IMMEDIATE+FORWARD_ONLY))

};

JIVariant[]servicesSet=wbemServices.callMethodA("ExecQuery",params);

IJIDispatchwbemObjectSet=(IJIDispatch)narrowObject(servicesSet[0].getObjectAsComObject());

第三步：执行方法

现在，已得到Win32_Service类的实例，可采用下述代码来调用同一类的方法，因为，它返回多个服务实例，要列举它们以便获取IJIDispatcher服务。

JIVariant newEnumvariant = wbemObjectSet.get("_NewEnum");

IJIComObject enumComObject = newEnumvariant.getObjectAsComObject();

IJIEnumVariant enumVariant = (IJIEnumVariant) narrowObject(enumComObject.queryInterface(IJIEnumVariant.IID));

Object[] elements = enumVariant.next(1);

JIArray aJIArray = (JIArray) elements[0];

JIVariant[] array = (JIVariant[]) aJIArray.getArrayInstance();

for (JIVariant variant : array) {

    IJIDispatch wbemObjectDispatch = (IJIDispatch) narrowObject(variant.getObjectAsComObject());

    JIVariant returnStatus = wbemObjectDispatch.callMethodA("StopService");

    System.out.println(returnStatus.getObjectAsInt());

}

现在，下面的代码显示了一个使用WMI启动和停止Windows服务的完整Java类。

packagecom.wmi.windows;

importstaticorg.jinterop.dcom.core.JIProgId.valueOf;

importstaticorg.jinterop.dcom.impls.JIObjectFactory.narrowObject;

importstaticorg.jinterop.dcom.impls.automation.IJIDispatch.IID;

importjava.util.logging.Level;

importorg.jinterop.dcom.common.JIException;

importorg.jinterop.dcom.common.JIRuntimeException;

importorg.jinterop.dcom.common.JISystem;

importorg.jinterop.dcom.core.IJIComObject;

importorg.jinterop.dcom.core.JIArray;

importorg.jinterop.dcom.core.JIComServer;

importorg.jinterop.dcom.core.JISession;

importorg.jinterop.dcom.core.JIString;

importorg.jinterop.dcom.core.JIVariant;

importorg.jinterop.dcom.impls.automation.IJIDispatch;

importorg.jinterop.dcom.impls.automation.IJIEnumVariant;

publicclassServiceManager{

         privatestaticStringdomainName="";

         privatestaticStringuserName="administrator";

         privatestaticStringpassword="";

         privatestaticStringhostIP="127.0.0.1";

         privatestaticfinalStringwin32_namespace="ROOT\\CIMV2";

         privatestaticfinalintSTOP_SERVICE=0;

         privatestaticfinalintSTART_SERVICE=1;

         privateJISessiondcomSession=null;

         publicstaticvoidmain(String[]args){

                 ServiceManagermanager=newServiceManager();

                  manager.stopService(domainName,hostIP,userName,password,"MySql");//stopsaservicenamedMySql

         }

   publicvoidstartService(StringdomainName,Stringhostname,Stringusername,Stringpassword,StringserviceName){

                 execute(domainName,hostname,username,password,serviceName,START_SERVICE);

         }

    publicvoidstopService(StringdomainName,Stringhostname,Stringusername,Stringpassword,StringserviceName){

                 execute(domainName,hostname,username,password,serviceName,STOP_SERVICE);

         }

 publicvoidexecute(StringdomainName,Stringhostname,Stringusername,Stringpassword,StringserviceName,intaction){

                 try{

                          IJIDispatchwbemServices=createCOMServer();

                          finalintRETURN_IMMEDIATE=0x10;

                          finalintFORWARD_ONLY=0x20;

                          Object[]params=newObject[]{

                                            newJIString("SELECT*FROMWin32_ServiceWHEREName='"+serviceName+"'"),

                                            JIVariant.OPTIONAL_PARAM(),

                                            newJIVariant(newInteger(RETURN_IMMEDIATE+FORWARD_ONLY))

                          };

                          JIVariant[]servicesSet=wbemServices.callMethodA("ExecQuery",params);

                          IJIDispatchwbemObjectSet=(IJIDispatch)narrowObject(servicesSet[0].getObjectAsComObject());

                          JIVariantnewEnumvariant=wbemObjectSet.get("_NewEnum");

                          IJIComObjectenumComObject=newEnumvariant.getObjectAsComObject();

                   IJIEnumVariantenumVariant=(IJIEnumVariant)narrowObject(enumComObject.queryInterface(IJIEnumVariant.IID));

                          Object[]elements=enumVariant.next(1);

                          JIArrayaJIArray=(JIArray)elements[0];

                          JIVariant[]array=(JIVariant[])aJIArray.getArrayInstance();

                          for(JIVariantvariant:array){

                                   IJIDispatchwbemObjectDispatch=(IJIDispatch)narrowObject(variant.getObjectAsComObject());

                                   //Printobjectastext.

                                   JIVariant[]v=wbemObjectDispatch.callMethodA("GetObjectText_",newObject[]{1});