package com.demo; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import javax.servlet.annotation.*; @WebServlet(name = "FileUploadServlet", urlPatterns = {"/fileUpload.do"}) @MultipartConfig(location = "D:\\", fileSizeThreshold = 1024) public class FileUploadServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 设置请求和响应的字符编码为UTF-8 request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); // 返回Web应用程序文档根目录 String path = this.getServletContext().getRealPath("/"); String mnumber = request.getParameter("mnumber"); Part p = request.getPart("fileName"); PrintWriter out = response.getWriter(); out.println(""); out.println(""); if (p.getSize() > 1024 * 1024) { // 上传的文件不能超过1MB大小 p.delete(); out.println("文件太大，不能上传！"); } else { path = path + "\\student\\" + mnumber; File f = new File(path); if (!f.exists()) { // 若目录不存在，则创建目录 f.mkdirs(); } // 得到文件名 String h = p.getHeader("content-disposition"); String fname = getFileName(h); p.write(path + "\\" + fname); out.println("文件上传成功！"); } out.println(""); } private String getFileName(String contentDisposition) { String[] parts = contentDisposition.split(";"); for (String part : parts) { if (part.trim().startsWith("filename")) { return part.substring(part.indexOf('=') + 1).trim().replace("\"", ""); } } return null; } }