javamail将图像添加到html电子邮件中.怎么样？

Question

我正在发送带有javamail的电子邮件没有问题(我使用EJB 3.0),问题是当我尝试通过使用多部分方法将一些图像添加到html时.出于某种原因,我得到一个FileNotFoundException.我不知道如何获取位于WEB-INF/resources/images的.png图像的路径.

这是我做的:

Message message = new MimeMessage(mailSession);
        // From: is our service
        message.setFrom(new InternetAddress(from));
        // To: destination given
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(to));
        message.setSubject("Uspijesna registracija");
        // How to found at http://www.rgagnon.com/javadetails/java-0321.html
        message.setContent(generateActivationLinkTemplate(), "text/html");

        Date timeStamp = new Date();
        message.setSentDate(timeStamp);

        // Prepare a multipart HTML
        Multipart multipart = new MimeMultipart("related");
        // Prepare the HTML
        BodyPart htmlPart = new MimeBodyPart();
        htmlPart.setContent(generateActivationLinkTemplate(), "text/html");
        multipart.addBodyPart(htmlPart);
        // PREPARE THE IMAGE
        BodyPart imgPart = new MimeBodyPart();
        DataSource ds = new FileDataSource("logomailtemplate.png");
        imgPart.setDataHandler(new DataHandler(ds));
        imgPart.setHeader("Content-ID", "the-img-1");
        multipart.addBodyPart(imgPart);
        // Set the message content!
        message.setContent(multipart);

        Transport.send(message);

该文本来自另一种正常工作的方法.我认为问题在于这行代码:

DataSource ds = new FileDataSource("logomailtemplate.png");

这就是控制台所说的:

java.io.FileNotFoundException:logomailtemplate.png(系统找不到指定的文件)

我如何访问该图像？它位于WEB-INF /资源/图像我被困在这个生病的举行日非常感谢一只手:)

----------------------------------- UPDATE -------------- -----------------

Message message = new MimeMessage(mailSession);
        // From: is our service
        message.setFrom(new InternetAddress(from));
        // To: destination given
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(to));
        message.setSubject("Uspijesna registracija");
        // How to found at http://www.rgagnon.com/javadetails/java-0321.html
        message.setContent(generateActivationLinkTemplate(), "text/html");

        Date timeStamp = new Date();
        message.setSentDate(timeStamp);

        // Prepare a multipart HTML
        Multipart multipart = new MimeMultipart();
        // Prepare the HTML
        BodyPart htmlPart = new MimeBodyPart();
        htmlPart.setContent(generateActivationLinkTemplate(), "text/html");
        multipart.addBodyPart(htmlPart);
        // PREPARE THE IMAGE
        BodyPart imgPart = new MimeBodyPart();

        String fileName = "WEB-INF/resources/images/logoemailtemplate.png";
        InputStream stream = null;
        ClassLoader classLoader = Thread.currentThread()
                .getContextClassLoader();
        if (classLoader == null) {
            classLoader = this.getClass().getClassLoader();
        }
        stream = classLoader.getResourceAsStream(fileName);
        DataSource ds = new ByteArrayDataSource(stream, "image/*");             

        imgPart.setDataHandler(new DataHandler(ds));
        imgPart.setHeader("Content-ID", "the-img-1");
        multipart.addBodyPart(imgPart);
        // Set the message content!
        message.setContent(multipart);

        Transport.send(message);

- - - - - - - - - - - - - - - - - - - - - 堆栈跟踪 - - - -----------------------------

警告:StandardWrapperValve [Faces Servlet]:PWC1406:servlet的Servlet.service()Faces Servlet抛出异常javax.faces.el.E​​valuationException:javax.ejb.EJBException ................

严重:javax.ejb.EJBException javax.faces.el.E​​valuationException:位于com.sun.faces.application.ActionListenerImpl.processAction的javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)中的javax.ejb.EJBException( ActionListenerImpl.java:102)at javax.faces.component.UICommand.broadcast(UICommand.java:315)at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:775)at javax.faces.component.UIViewRoot.processApplication (UIViewRoot.java:1267)com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)at com.sun. faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)的javax.faces.webapp.FacesServlet.service(FacesServlet.java:312) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)org.apache.catalina.core.Standard 在com的com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)的org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)上的ContextValve.invoke(StandardContextValve.java:188) .sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter) .java:325)在org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)com.com的com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165). sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask. java:954)at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)at com.sun.grizzly.http.HttpProtocolChain .execute(HttpProtocolChain.java:76)at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)at com.sun.grizzly. ContextTask.run(ContextTask.java:69)at com.sun.grizzly.util.AbstractThreadPool $ Worker.doWork(AbstractThreadPool.java:330)at com.sun.grizzly.util.AbstractThreadPool $ Worker.run(AbstractThreadPool.java: 309)at java.lang.Thread.run(Thread.java:662)引起:com.sun.ejb的com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5119)中的javax.ejb.EJBException .containers.BaseContainer.completeNewTx(BaseContainer.java:5017)at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4805)at com.sun.ejb.container s.BaseContainer.postInvoke(BaseContainer.java:2004)at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1955)at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:198) at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:84)位于sun.reflect.NativeMethodAccessorImpl.invoke0的managedbeans.RegistrationController.doRegisterBuyer(RegistrationController.java:64)的$ Proxy162.sendAccountActivationLinkToBuyer(未知来源)本地方法)在sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)在com.sun.el.parser.AstValue.invoke(AstValue.java:234)的com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)org.jboss.weld.util.el.ForwardingMethodExpression.invoke (ForwardingMethodExpr ession.java:43)atg.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:72)at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:98)at javax.faces .component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)... 32更多

引起:javax.mail.util.ByteArrayDataSource.(ByteArrayDataSource.java:83)的java.lang.NullPointerException,位于sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)的ejbs.EmailServiceEJB.sendAccountActivationLinkToBuyer(EmailServiceEJB.java:69) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)位于org.glassfish的java.lang.reflect.Method.invoke(Method.java:597)的sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)位于com.sun.ejb.containers.BaseContainer.invokeBeanMethod的org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1128)的.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1056) (BaseContainer.java:5292)com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:615)at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:797)at com.sun. org.jb上的ejb.EjbInvocation.proceed(EjbInvocation.java:567)oss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:47)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.在com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:858)的com.sun上的java.lang.reflect.Method.invoke(Method.java:597)中调用(DelegatingMethodAccessorImpl.java:25)位于com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:567)的com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy)中的.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:797) .java:157)at.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:139)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java) :39)在sun.reflect .在java.sng.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:858)的java.lang.reflect.Method.invoke(Method.java:597)中删除了MethodAethorAccess.Iv.Invoke(DelegatingMethodAccessorImpl.java:25) com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:797)位于com.sun.ejb.containers的com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:367).在com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5252)的com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:190)中的BaseContainer .__ intercept(BaseContainer.java:5264)..还有45个

-----------------------------------更新2 ------------- ----------------------------

String fileName = "/WEB-INF/resources/images/logoemailtemplate.png";
        InputStream stream = null;
        ClassLoader classLoader = Thread.currentThread()
                .getContextClassLoader();
        if (classLoader == null) {
            classLoader = this.getClass().getClassLoader();
        }
        //This line dont work!
        stream = classLoader.getResourceAsStream(fileName);                                                 


        DataSource ds = new    URLDataSource(classLoader.getResource(fileName));

// DataSource ds = new FileDataSource(new File(classLoader // .getResource(fileName).toURI())); 也行不通.我也尝试了两个/没有/

Answer 1

实现这一目标的一种方法是:

DataSource ds = new ByteArrayDataSource(getServletContext().getResourceAsStream("WEB-INF/resources/images/logomailtemplate.png") ,mimeType);

getServletContext().getResourceAsStream()从a收到HttpServlet并返回InputStream.

更好的是做到这一点

String fileName = "/WEB-INF/resources/images/logomailtemplate.png";
InputStream stream = getServletContext().getResourceAsStream(fileName); //or null if you can't obtain a ServletContext

if (stream == null) {
    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
    if (classLoader == null) {
        classLoader = this.getClass().getClassLoader();
    }

    stream = classLoader.getResourceAsStream(fileName);
}

DataSource ds = new ByteArrayDataSource(stream, "image/*");

更新

另外

String fileName = "WEB-INF/resources/images/logomailtemplate.png";
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
    classLoader = this.getClass().getClassLoader();
}

DataSource ds = new FileDataSource(new File(classLoader.getResource(fileName).toURI()));

//OR
DataSource ds = new URLDataSource(classLoader.getResource(fileName));

确保fileName以"/"开头.