Java Jersey - 如何在我的 Tomcat 服务器中写入文件

问题描述

我在将文件写入系统中 tomcat 服务器的本地主机时遇到问题.

I got a problem in writing the file to the localhost of the tomcat server in my system.

如何在下面提到的位置写入文件??我收到了在提到的位置上传的文件的响应.但我不知道它存储在我系统中的什么位置.这是正确的做法吗?

How can i write file in the location mentioned Below ?? I am getting a response as the file uploaded in the location mentioned. But i don't know where it is stored in my system.. Is it the right way of doing ??

@POST
@Path("/upload")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response uploadFile(
        @FormDataParam("file") InputStream uploadedInputStream,
        @FormDataParam("file") FormDataContentDisposition fileDetail) {

    String uploadedFileLocation = "http://127.0.0.1:8080/Attachments"
            + fileDetail.getFileName();

    // save it
    writeToFile(uploadedInputStream, uploadedFileLocation);

    String output = "File uploaded to : " + uploadedFileLocation;

    return Response.status(200).entity(output).build();

}

private void writeToFile(InputStream uploadedInputStream, String uploadedFileLocation) {
  try {
    OutputStream out = new FileOutputStream(new File( uploadedFileLocation));
    int read = 0;
    byte[] bytes = new byte[1024];
    out = new FileOutputStream(new File(uploadedFileLocation));
    while ((read = uploadedInputStream.read(bytes)) != -1) {
      out.write(bytes, 0, read);
    }
    out.flush();
    out.close();
  } catch (IOException e) {
    e.printStackTrace();
  }
}

实际上我从 得到了这个 [writeToFile] 代码http://www.mkyong.com/webservices/jax-rs/file-upload-example-in-jersey/

推荐答案

您正在尝试写入名为 http://127.0.0.1:8080/Attachments/something 的 File.else.那肯定行不通；根据 JavaDoc:

You're trying to write to a File called http://127.0.0.1:8080/Attachments/something.else. That is surely not going to work; according to the JavaDoc:

如果文件存在但是是一个目录而不是一个普通文件，不存在但不能创建，或者由于任何其他原因不能打开，则抛出一个 FileNotFoundException.

由于您只是打印出异常堆栈跟踪，但没有处理失败，因此您不会收到写入文件失败的指示.检查您的服务器日志，会有一个堆栈跟踪说明找不到您尝试访问的文件.

Since you just print out your Exception stacktrace, but don't handle the failure, you don't get an indication that writing the file failed. Check your server log, there'll be a stacktrace stating the file you're trying to access cannot be found.

相反，生成一个文件名，例如 System.getProperty("java.io.tmpdir") + fileDetail.getFileName()，然后写入该文件.File 类的 JavaDoc 声明:

Instead, generate a filename, for example System.getProperty("java.io.tmpdir") + fileDetail.getFileName(), and write to that file. The JavaDoc for the File class states:

在 UNIX 系统上，此属性的默认值通常是/tmp"或/var/tmp"；在 Microsoft Windows 系统上，它通常是C:\WINNT\TEMP".

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