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自从我在 Docker 上使用 microservice-spring5 以来,我一直在尝试将 PDF 发送到打印机。

我发现 Apache Camel Printer 可以做到这一点。如果您有任何其他建议,请发表评论。

https://camel.apache.org/components/latest/lpr-component.html

所以.. 我做了一个 telnet 来验证端口 515 是否可以用于 lpd/lpr

我尝试通过 lpr 将 PDF(InputStream)直接发送到打印机

public void sendToPrinter(InputStream is) {
  String sendTo = "lpr://myIpAddress/myPrinterName?flavor=DocFlavor.INPUT_STREAM&mimeType=PDF";
  try {
    ModelCamelContext context = new DefaultCamelContext();
    context.addRoutes(new RouteBuilder() {
      public void configure() {
        from("direct:start").to(sendTo);
      }
    });
    context.start(); // **exception throw here** 
    
    ProducerTemplate template = context.createProducerTemplate();
    template.start();
    template.send("direct:start", new Processor() {
      @Override
      public void process(Exchange exchange) throws Exception {
        byte[] buffer = new byte[is.available()];
        int n = is.available();
        for (int i = 0; i < n; i++) {
          buffer[i] = (byte) is.read();
        }
        is.close();
        exchange.setProperty(Exchange.CHARSET_NAME, "UTF-8");
        Message in = exchange.getIn();
        in.setBody(buffer);
      }
    }
}

Exception: javax.print.PrintException: No printer found with name: myIpAddresse/myPrinterName. Please verify that the host and printer are registered and reachable from this machine.

我无法在我的 docker image linux 中设置服务器 CUPS我必须通过代码直接寻址打印机服务器。任何想法 ?

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