JAVAEE-文件上传

需要引入的jar文件：commons-fileupload-1.3.2，commons-io-2.5.jar。 下载地址 http://commons.apache.org/proper/commons-fileupload/ http://commons.apache.org/proper/commons-io/

通过Servlet实现 package com.upload.servlet; import java.io.File; import java.io.IOException; import java.util.List; ...导入需要的包 public class UploadServlet extends HttpServlet { private TouXiangService service=new TouXiangServiceImpl(); public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { TouXiang tx = new TouXiang(); try { // 文件上传 // 可以判断当前请求是不是二进制，如果不是可以终止代码 if (!ServletFileUpload.isMultipartContent(request)) { return; } // 获得FileItemFactory类 // 能够创建文件输入流的工厂对象 FileItemFactory factory = new DiskFileItemFactory(); // 获得ServletFileUpload对象 ServletFileUpload upload = new ServletFileUpload(factory); // 设置最大上传大小 upload.setSizeMax(3 * 1024 * 1024); // 设置上传字符集(好像不好用) // upload.setHeaderEncoding("utf-8"); // 通过upload对象中的parseRequest方法获得FileItem类型的集合 List<FileItem> list = upload.parseRequest(request); // 遍历所有表单元素 for (FileItem fi : list) { // 迭代到当前表单元素如果是普通元素 if (fi.isFormField()) { if (fi.getFieldName().equals("username")) tx.setUsername(fi.getString("utf-8")); if (fi.getFieldName().equals("gender")) tx.setGender(fi.getString("utf-8")); } else { // 如果是文件域 // 获得用户上传的文件名 // String filename = fi.getName(); // 使用时间偏移量和随机数来生成文件名，减少重复几率 String sui = (int) (Math.random() * 10000000) + ""; String shi = System.currentTimeMillis() + ""; //时间+随机数+上传文件名的后缀名 String filename = shi + sui + fi.getName().substring( fi.getName().lastIndexOf(".")); // System.out.println(filename); // 获得项目在服务器计算机中的真实路径 String path = this.getServletContext() .getRealPath("upload"); fi.write(new File(path + "/" + filename)); //设置tx对象中的imgname属性为filename tx.setImgname(filename); } } } catch (FileUploadException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } //写入数据库 int num=service.addTouXing(tx); //重定向到显示页面 response.sendRedirect("ShowServlet"); } } 通过springmvc 实现 package com.mvc.controller; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.List; import javax.servlet.http.HttpServletRequest; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; @Controller @RequestMapping("uploads.do") public class UploadsController { @RequestMapping public String upload(HttpServletRequest request) throws IOException { MultipartHttpServletRequest req = (MultipartHttpServletRequest) request; //获取表单里myfile的数据 List<MultipartFile> list = req.getFiles("myfile"); // 获得真是路径 String path = request.getSession().getServletContext() .getRealPath("upload"); for (MultipartFile mf : list) { if (mf.isEmpty()) continue; // 获得输入流 InputStream inputStream = mf.getInputStream(); // 获得定义文件名，获得后缀名 String fname = System.currentTimeMillis() + "" + (int) (Math.random() * 1000000) + mf.getOriginalFilename().substring( mf.getOriginalFilename().lastIndexOf(".")); // 获得输出流 OutputStream outputStream = new FileOutputStream(path + "\\" + fname); int len = 0; // 缓冲 byte[] b = new byte[1024]; // 循环读写 while ((len = inputStream.read(b)) > 0) { outputStream.write(b, 0, len); } inputStream.close(); outputStream.close(); } return "redirect:main.jsp"; } }

上传多个

@Controller @RequestMapping("uploads.do") public class UploadsController { @RequestMapping public String upload(HttpServletRequest request) throws IOException { MultipartHttpServletRequest req = (MultipartHttpServletRequest) request; //获取表单里myfile的数据 List<MultipartFile> list = req.getFiles("myfile"); // 获得真是路径 String path = request.getSession().getServletContext() .getRealPath("upload"); for (MultipartFile mf : list) { if (mf.isEmpty()) continue; // 获得输入流 InputStream inputStream = mf.getInputStream(); // 获得定义文件名，获得后缀名 String fname = System.currentTimeMillis() + "" + (int) (Math.random() * 1000000) + mf.getOriginalFilename().substring( mf.getOriginalFilename().lastIndexOf(".")); // 获得输出流 OutputStream outputStream = new FileOutputStream(path + "\\" + fname); int len = 0; // 缓冲 byte[] b = new byte[1024]; // 循环读写 while ((len = inputStream.read(b)) > 0) { outputStream.write(b, 0, len); } inputStream.close(); outputStream.close(); } return "redirect:main.jsp"; } }