利用servlet3.0上传，纯原生上传，不依赖任何第三方包

@WebServlet(name = "uploadServlet", urlPatterns = "/uploadServlet")
@MultipartConfig
public class ServletUpload extends HttpServlet {

    private static final long serialVersionUID = 2527441790014487640L;

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) {
        doPost(request, response);
    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        try {
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html;charset=utf-8");
            Collection<Part> parts = request.getParts();
            if (null == parts) {
                // 抛出异常
            }
            for (Part part : parts) {
                String header = part.getHeader("content-disposition");
                String fileName = getFileName(header);
                part.write("d:/" + fileName);
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ServletException e) {
            e.printStackTrace();
        }

    }

    /**
     * 获得文件名 fileName-----取得上传文件的后缀+uuid
     * 
     * @param header
     * @return
     */
    private String getFileName(String header) {
        String suffix = header.substring(header.lastIndexOf("."),
                header.length() - 1);
        String fileName = UUID.randomUUID().toString().replace("-", "");
        return fileName + suffix;
    }
}