使用getParts()上传多个文件

<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    </head>
    <body>
        <div>
            <form action="UploadServlet3" method="POST" enctype="multipart/form-data">
                <table>
                    <tr>
                        <td><label for="file1">文件1：</label></td>
                        <td><input type="file" id="file1" name="file"></td>
                    </tr>
                    <tr>
                        <td><label for="file2">文件2：</label></td>
                        <td><input type="file" id="file2" name="file"></td>
                    </tr>
                    <tr>
                        <td><label for="file3">文件3：</label></td>
                        <td><input type="file" id="file3" name="file"></td>
                    </tr>
                    <tr>
                        <td colspan="2"><input type="submit" value="上传" name="upload"></td>
                    </tr>
                </table>
            </form>
        </div>
    </body>
</html>

　

@MultipartConfig(location = "e:/workspace")
@WebServlet(name = "UploadServlet", urlPatterns = {"/UploadServlet"})
public class UploadServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        //迭代Collection中所有Part对象
        for (Part part : request.getParts()) {
            //只处理上传文件区段
            if (part.getName().startsWith("file")) {
                String fileName = getFileName(part);
                part.write(fileName);
            }
        }
    }

    private String getFileName(Part part) {
        String header = part.getHeader("Content-Disposition");
        String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));
        header.lastIndexOf("\"");
        return fileName;
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}