文件上传和下载

来源：互联网发布：工业自动化软件开发编辑：程序博客网时间：2024/05/09 07:33

要加commons-fileupload-1.2.2.jar、commons-io-2.4.jar。

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">       <property name="maxUploadSize" value="104857600"/></bean>

1.文件上传

@Controller@RequestMapping(value = "/fileope")public class FileUploadController {@RequestMapping(value = "upload", method = RequestMethod.POST)public String upload(HttpServletRequest request, @RequestParam(value = "myFile", required =false) MultipartFile[] files) {       try {           for(int i=0;i<files.length;i++){              FileUploadUtils.upload(request, files[i]);        }        } catch (Exception e) {            e.printStackTrace();        }        return "success"; }}

public class FileUploadUtils {//默认大小 50Mpublic static final long DEFAULT_MAX_SIZE = 52428800;//默认上传的地址public static String defaultBaseDir = "upload";public static final String upload(HttpServletRequest request, MultipartFile file)throws Exception{        String filename = extractFilename(file, defaultBaseDir);        File desc = getAbsoluteFile(extractUploadDir(request), filename);        file.transferTo(desc);        return filename;}private static final File getAbsoluteFile(String uploadDir, String filename) throws IOException {        if(uploadDir.endsWith("/")) {uploadDir = uploadDir.substring(0, uploadDir.length() - 1); }        if(filename.startsWith("/")) {filename = filename.substring(0, uploadDir.length() - 1); }        File desc = new File(uploadDir + "/" + filename);        if(!desc.getParentFile().exists()) {desc.getParentFile().mkdirs(); }        if(!desc.exists()) {desc.createNewFile(); }        return desc;}public static final String extractFilename(MultipartFile file, String baseDir) throws UnsupportedEncodingException {        String filename = file.getOriginalFilename();        int slashIndex = filename.indexOf("/");        if (slashIndex >= 0) {filename = filename.substring(slashIndex + 1);}        filename = baseDir + "/" + filename;        return filename;}public static final String extractUploadDir(HttpServletRequest request) {       return request.getServletContext().getRealPath("/");}}

2.文件下载

@RequestMapping(value = "download", method = RequestMethod.GET)public static void download(HttpServletRequest request,HttpServletResponse response, String fileName) throws Exception {        response.setContentType("text/html;charset=UTF-8");        request.setCharacterEncoding("UTF-8");        BufferedInputStream bis = null;        BufferedOutputStream bos = null;        String newFileName = new String(fileName.getBytes("ISO8859-1"),"UTF-8");        String ctxPath = request.getSession().getServletContext().getRealPath("/") + FileUploadUtils.defaultBaseDir;        String downLoadPath = ctxPath +"/"+ newFileName;        long fileLength = new File(downLoadPath).length();        response.setHeader("Content-disposition", "attachment; filename="+ new String(newFileName.getBytes("gb2312"), "ISO8859-1"));        response.setHeader("Content-Length", String.valueOf(fileLength));        bis = new BufferedInputStream(new FileInputStream(downLoadPath));        bos = new BufferedOutputStream(response.getOutputStream());        byte[] buff = new byte[2048];        int bytesRead;        while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {               bos.write(buff, 0, bytesRead);        }        bis.close(); bos.close();}

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