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org.springframework.util.FileCopyUtils类的copy方法可以实现文件拷贝，同时设置输出流为HttpServletResponse,则可以实现文件下载
文件上传必须使用form的同步或异步表单提交，且设置form属性enctype="multipart/form-data"
类中filekey为文件框ID(即下文的fileField )
前端示例：
public class FileStreamService { public class UploadFileName{ public String allPathName; public String name ; } /** * 上传文件 * * @param request 请求 * @param fileKey 请求文件所使用的KEY * @param DesFileName 目标路径文件名 * @return String 全路径文件名 * * history * */ public String fileUpLoad(HttpServletRequest request , String fileKey , String DesFileName){ // 转型为MultipartHttpRequest： MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; // 获得文件： CommonsMultipartFile cfile = (CommonsMultipartFile) multipartRequest.getFile(fileKey); File fo = null; try { fo = new File(DesFileName ); cfile.getFileItem().write(fo); } catch (Exception e) { throw new SystemException(e.getMessage()); } return DesFileName; } /** * 上传文件 * * @param request * @param fileKey * @param desFilePath * @param DesFileName * @return String */ public UploadFileName fileUpLoad(HttpServletRequest request, String fileKey, String desFilePath, String DesFileName ){ UploadFileName r = new UploadFileName(); MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; CommonsMultipartFile cfile = (CommonsMultipartFile) multipartRequest.getFile(fileKey); File dir = new File(desFilePath+File.separator); if (!dir.exists()){ dir.mkdirs(); } String fileName = cfile.getOriginalFilename(); String fix = fileName.substring(fileName.lastIndexOf(".")).toLowerCase(); fileName = desFilePath+File.separator+DesFileName+fix; r.allPathName = fileName; r.name = DesFileName+fix; File fo = null; try{ fo = new File(fileName); cfile.getFileItem().write(fo); }catch(Exception e){ throw new SystemException(e.getMessage()); } return r; } /** * 文件下载 * * @param response * @param filePath 服务器文件路径 * @param fileName 服务器文件名 * @param saveFileName 目标文件名 * @throws IOException */ public void fileDownLoad(HttpServletResponse response , String filePath , String fileName , String saveFileName) throws IOException{ InputStream fis = null; try{ File file = new File(filePath + fileName); if(!file.exists()){ throw new SystemException("文件不存在"); } fis = new BufferedInputStream(new FileInputStream(filePath+fileName)); String f = saveFileName.equals("") ? fileName : saveFileName; response.setContentType("application/x-msdownload;"); response.setHeader("Content-disposition", "attachment; filename="+ new String(f.getBytes("GB2312"), "ISO-8859-1")); response.setContentType("application/" + fileName.substring(fileName.lastIndexOf(".") + 1)); FileCopyUtils.copy(fis, response.getOutputStream()); }finally{ if(fis != null){ try{ fis.close(); }catch(Exception e){ e.printStackTrace(); } } } } /** * 文件下载 * @param response * @param fileName 文件URL地址 * @throws IOException */ public void fileDownLoad(HttpServletResponse response ,String fileName) throws IOException { String fileAll = FilePatch.getProjectPatch()+File.separator+fileName; fileAll = fileAll.replace("/", File.separator); String filepath=fileAll.substring( 0 , fileAll.lastIndexOf(File.separator)+1); String name=fileAll.substring(fileAll.lastIndexOf(File.separator)+1); fileDownLoad(response , filepath , name , name); } /** * 删除文件 * * @param fileName void */ public void fileDel(String fileName){ File file = new File(fileName); if (file.exists()){ file.delete(); } }} 转载地址：http://hyrjz.baihongyu.com/