java servlet : stream image

Question

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已关闭 5 年前。

我正在尝试制作一个可以通过网址识别的图像主机。对于 GET 方法，我这样做了:

 @Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    String filename = request.getParameter("id");
    String path = request.getServletContext().getRealPath("/uploaded");
    File folder=new File(path);
    File file = new File(folder,filename);
    if (!file.exists()) 
        throw new ServletException("file not found");

    response.setContentLength((int)file.length());
    OutputStream out = response.getOutputStream();
    FileInputStream in = new FileInputStream(file);
    byte[] buffer = new byte[1024];
    int length;
    while ((length = in.read(buffer)) > 0) {
        out.write(buffer, 0, length);
    }
    in.close();
    out.flush();
}

如果我在我的开发环境(Netbeans+Glassifh)中尝试它，一切都会顺利，但是当我将它部署在 Amazon Web Services 中时，响应如下所示:�bc"IdIX�P�F��IJ/)�

你能帮我吗？谢谢!

Answer 1

尝试设置响应的适当Content-Type

例如对于 JPEG 图像:

response.setContentType("image/jpeg");