使用 Java 从 linux 上的图像获取路径

Question

工作环境： windows7、软呢帽 20， Java 7_79, 行家，日食

编辑

我有一个使用 maven 的网络 java 项目，我正在尝试获取我在 src/main/resouces 包中的图像以将图像放在电子邮件中，稍后将此图像设置为文件夹 WEB-INF/classes/html 中的 war。当运行 windows 7 的项目一切正常，但问题是当我运行我在 fedora 20 (linux) 上的 web 项目时，我得到下一个错误：

> 21:26:09,662 ERROR [stderr] (Thread-92) java.lang.NullPointerException
> 21:26:09,662 ERROR [stderr] (Thread-92)   at
> javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:226)
> 21:26:09,663 ERROR [stderr] (Thread-92)   at
> javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:299)
> 21:26:09,663 ERROR [stderr] (Thread-92)   at
> javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1375)
> 21:26:09,663 ERROR [stderr] (Thread-92)   at
> javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1021)
> 21:26:09,664 ERROR [stderr] (Thread-92)   at
> javax.mail.internet.MimeMultipart.updateHeaders(MimeMultipart.java:419)
> 21:26:09,664 ERROR [stderr] (Thread-92)   at
> javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1354)
> 21:26:09,664 ERROR [stderr] (Thread-92)   at
> javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2107)
> 21:26:09,665 ERROR [stderr] (Thread-92)   at
> javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2075)
> 21:26:09,665 ERROR [stderr] (Thread-92)   at
> javax.mail.Transport.send(Transport.java:123) 21:26:09,666 ERROR
> [stderr] (Thread-92)  at
> com.acertum.serc.util.SolicitudEmail.enviarCorreo(SolicitudEmail.java:148)
> 21:26:09,666 ERROR [stderr] (Thread-92)   at
> com.acertum.serc.controller.AgregarExcepcionView.run(AgregarExcepcionView.java:383)

这是获取图片路径的方法

public MimeBodyPart obtenerImagen(String urlImagen) throws IOException, MessagingException{
    logger.info("entro");
    URL url = getClass().getClassLoader().getResource(urlImagen);
    logger.info("url" + url);
    MimeBodyPart attachmentPart = new MimeBodyPart();
    logger.info("url.getPath()" + url.getPath().toString());
    attachmentPart.attachFile(url.getPath());
    attachmentPart.setDisposition(MimeBodyPart.INLINE);
    return attachmentPart;
}

我发送电子邮件的主要方法是下一个：

try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(ScoreConstants.getFromSolicitudEmail()));
            message.setRecipients(Message.RecipientType.TO, recipientes);
            message.setSubject(ScoreConstants.getSubjectSolicitudEmail());
            String fechaSistema="<html><body><br/><br/><br/><div align='right'><h3>M&eacute;xico,D.F a "+date+"</h3></div><br/>";
            String  nombreAcreditado="<br/><br/><div style='font-family: Calibri;'><strong>Acreditado: </strong> "+ acreditado +"</div><br/>";
            String  tipoproducto="<div style='font-family: Calibri;'><strong>Tipo de Producto: </strong>"+ subproducto +"</div><br/>";
            String  numeroMonto="<div style='font-family: Calibri;'><strong>Monto: </strong>"+ monto +"</div><br/>";
            String  descripcionExcepcion="<div style='font-family: Calibri;'><strong>Descripcion de la excepci&oacute;n: </strong>"+ descripcion +"</div><br/>";



            String linkAceptada = "<br/><br/><br/><br/><br/><br/><br/><br/><div style='margin-left: 350px;font-family: Calibri;'><a href='http://"+ ScoreConstants.getIpServidorWeb()+":"+ScoreConstants.getPuertoServidorWeb()+"/ScoreExcepciones/AceptadoRechazado.xhtml?nombre="
                    + acreditado
                    + "&celular="
                    + celular
                    + "&fase="
                    + fase
                    + "&excepcionId="
                    + excepcionId
                    + "&subproductoId="
                    + subproductoId
                    + "&version="
                    + version
                    + "&empleadoId="
                    + empleadoId
                    + "&ipAddres="
                    + ipAddress
                    + "&accion="+autorizar+"'>Autorizar</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"
                    + "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href='http://"+ScoreConstants.getIpServidorWeb()+":"+ScoreConstants.getPuertoServidorWeb()+"/ScoreExcepciones/AceptadoRechazado.xhtml?nombre="
                    + acreditado
                    + "&celular="
                    + celular
                    + "&fase="
                    + fase
                    + "&excepcionId="
                    + excepcionId
                    + "&subproductoId="
                    + subproductoId
                    + "&version="
                    + version
                    + "&empleadoId="
                    + empleadoId
                    + "&ipAddres="
                    + ipAddress
                    + "&accion="
                    + rechazar+ "'>Rechazar</a></div>";
            String cadena = String.format("%s%s%s%s%s%s%s", fechaSistema,
                    obtenerRutaContenido(File.separator + "html" + File.separator + "Correo.html"),
                    nombreAcreditado, tipoproducto, numeroMonto,
                    descripcionExcepcion, linkAceptada);






            MimeBodyPart cadenaContenido = new MimeBodyPart();
            cadenaContenido.setContent(cadena, "text/html");
            String rutaPiePagina=obtenerRutaContenido((File.separator  +"html" + File.separator + "PiePagina.html"));


            MimeBodyPart piePagina = new MimeBodyPart();
            piePagina.setContent(rutaPiePagina, "text/html");


            MimeBodyPart imagenCreada=obtenerImagen(("html" + File.separator + "Logo-AcertumBank-S.jpg"));

            message.setContent(ordenContenidos(imagenCreada,cadenaContenido,piePagina));

            Transport.send(message);
        } catch (AddressException e) {
            StringWriter stringWriter = new StringWriter();
            PrintWriter printWriter = new PrintWriter(stringWriter);
            e.printStackTrace(printWriter);
        } catch (MessagingException e) {
            StringWriter stringWriter = new StringWriter();
            PrintWriter printWriter = new PrintWriter(stringWriter);
            e.printStackTrace(printWriter);
        }

Answer 1

obtenerRutaContenido(File.separator + "html" + File.separator + "Correo.html"),
...
obtenerRutaContenido((File.separator  +"html" + File.separator + "PiePagina.html"));
...
obtenerImagen(("html" + File.separator + "Logo-AcertumBank-S.jpg"));

如果 obtenerRutaContenido() 和 obtenerImagen() 相似，您也需要以 File.separator 开始路径。

Answer 2

主要是你没有有一个文件（在文件系统上）但是有一个资源（在jar/war/class路径/...）。

public MimeBodyPart obtenerImagen(String urlImagen) throws IOException, MessagingException {
    logger.info("entro");
    URL url = getClass().getClassLoader().getResource(urlImagen);
    MimeBodyPart attachmentPart = new MimeBodyPart(url.openStream());
    attachmentPart.setFileName(url.getFile()); // Just "xyz.jpg" maybe
    attachmentPart.setDisposition(MimeBodyPart.INLINE);
    //attachmentPart.setContentType("image/jpeg");
    return attachmentPart;
}

这会将资源的 InputStream 带到 MimeBodyPart 构造函数以填充其中的内容。

使用 Java 从 linux 上的图像获取路径

get path from an image on linux with Java

java

linux

filepath

web-project