23号球衣

public class ImageServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //get the image parameter
        String img = req.getParameter("img");
        if(img == null) {
            throw new RuntimeException("You must sepcify a img");
        }
       
        // Get the absolute path of the image
        ServletContext sc = getServletContext();
        String filename = sc.getRealPath(img);    //relative to /WebContent
   
        // Get the MIME type of the image
        String mimeType = sc.getMimeType(filename);
        if (mimeType == null) {
            sc.log("Could not get MIME type of "+filename);
            resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            return;
        }
   
        // Set content type
        resp.setContentType(mimeType);
   
        // Set content size
        File file = new File(filename);
        resp.setContentLength((int)file.length());
   
        // Open the file and output streams
        FileInputStream in = new FileInputStream(file);
        OutputStream out = resp.getOutputStream();
   
        // Copy the contents of the file to the output stream
        byte[] buf = new byte[1024];
        int count = 0;
        while ((count = in.read(buf)) >= 0) {
            out.write(buf, 0, count);
        }
        in.close();
        out.close();
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
            IOException {
        doGet(req, resp);
    }
}

使用

<img src="imageServlet?img=/path/to/image.jpg"/>