java - 在硬编码的服务器路径上上传文件 Servlet

Question

我有一个显示文件浏览器和上传按钮的 .jsp 页面，以及一个应该将文件上传到服务器的 Servlet。问题是文件已上传到临时文件夹，但我需要将其上传到服务器上的特定路径，但无法识别该路径。

UploadServlet: doPost 方法

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    try {
        // get access to file that is uploaded from client
        Part p1 = request.getPart("file");
        InputStream is = p1.getInputStream();

        String filename = getFilename(p1);

        // get temporary path - this works but it saves on a tmp folder...
        //String outputfile = this.getServletContext().getRealPath(filename);  // get path on the server

        //hardcoded path on which I have to save my file
        String outputfile = "http://localhost:8080/Tutorial2/Upload/" + filename;

        FileOutputStream os = new FileOutputStream (outputfile);

        // write bytes taken from uploaded file to target file
        int ch = is.read();
        while (ch != -1) {
             os.write(ch);
             ch = is.read();
        }
        os.close();
        out.println("<h3>File uploaded successfully!</h3>");
    }
    catch(Exception ex) {
       out.println("Exception -->" + ex.getMessage());
    }
    finally { 
        out.close();
    }
}

private static String getFilename(Part part) {
    for (String cd : part.getHeader("content-disposition").split(";")) {
        if (cd.trim().startsWith("filename")) {
            String filename = cd.substring(cd.indexOf('=') + 1).trim().replace("\"", "");
            return filename.substring(filename.lastIndexOf('/') + 1).substring(filename.lastIndexOf('\\') + 1); // MSIE fix.
        }
    }
    return null;
}

.jsp 页面

  <form action="UploadServlet" method="post" enctype="multipart/form-data">
    <table>
        <tr>
            <td>Select File : </td>
            <td><input  name="file" type="file"/> </td>
        </tr>
    </table>
    <p/>
    <input type="submit" value="Upload File"/>
</form>

我看过很多关于这个问题的帖子，但都没有帮助我。当我运行我的 servlet 时，我在 FileOutputStream os = new FileOutputStream (outputfile); - Exception -->http:\localhost:8080\Tutorial2\Upload\SvnBridge.exe (The文件名、目录名或卷标语法不正确)。搜索这个并没有找到任何相关的东西。我不知道它是否有帮助，但我使用 Servlet 3.0 和 Apache Tomcat v7。

你知道为什么我不能把我的文件写到上面的路径吗？

谢谢，

Answer 1

类似问答 How to set the path to "context path" for uploaded files using Apache Common fileupload?

使用java.io.File

String relativeWebPath = "/WEB-INF/uploads";
String absoluteFilePath = getServletContext().getRealPath(relativeWebPath);
File uploadedFile = new File(absoluteFilePath, FilenameUtils.getName(item.getName()));
// ...