FileUtils java web 文件上传下载工具

package common.utils; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.UUID; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class FileUtils { private FileUtils() { } public static void download(HttpServletRequest request, HttpServletResponse response, String relativeFilePath) { try { request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); String fileName = request.getSession().getServletContext() .getRealPath("/") + relativeFilePath; fileName = fileName.replace("\\", "/");//统一分隔符格式 File file = new File(fileName); //如果文件不存在 if (file == null || !file.exists()) { String msg = "file not exists!"; System.out.println(msg); PrintWriter out = response.getWriter(); out.write(msg); out.flush(); out.close(); return; } String fileType = request.getSession().getServletContext() .getMimeType(fileName); if (fileType == null) { fileType = "application/octet-stream"; } response.setContentType(fileType); System.out.println("文件类型是：" + fileType); String simpleName = fileName.substring(fileName.lastIndexOf("/")+1); String newFileName = new String(simpleName.getBytes(), "ISO8859-1"); response.setHeader("Content-disposition", "attachment;filename="+newFileName); BufferedInputStream bis = new BufferedInputStream( new FileInputStream(file)); BufferedOutputStream bos = new BufferedOutputStream( response.getOutputStream()); byte[] buffer = new byte[1024]; int length = 0; while ((length = bis.read(buffer)) != -1) { bos.write(buffer, 0, length); } if (bis != null) bis.close(); if (bos != null) bos.close(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 文件上传 * * @param request HttpServletRequest * @param relativeUploadPath 上传文件保存的相对路径，例如"upload/"，注意，末尾的"/"不要丢了 * @param maxSize 上传的最大文件尺寸，单位字节 * @param thresholdSize 最大缓存，单位字节 * @param fileTypes 文件类型，会根据上传文件的后缀名判断。<br> * 比如支持上传jpg,jpeg,gif,png图片,那么此处写成".jpg .jpeg .gif .png",<br> * 也可以写成".jpg/.jpeg/.gif/.png"，类型之间的分隔符是什么都可以，甚至可以不要，<br> * 直接写成".jpg.jpeg.gif.png"，但是类型前边的"."不能丢 * @return */ public static List<String> upload(HttpServletRequest request, String relativeUploadPath, int maxSize, int thresholdSize, String fileTypes) { // 设置字符编码 try { request.setCharacterEncoding("UTF-8"); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } String tempPath = relativeUploadPath + "temp"; // 临时文件目录 String serverPath = request.getSession().getServletContext().getRealPath("/").replace("\\", "/"); fileTypes = fileTypes.toLowerCase(); // 将后缀全转换为小写 //如果上传文件目录和临时目录不存在则自动创建 if (!new File(serverPath + relativeUploadPath).isDirectory()) { new File(serverPath + relativeUploadPath).mkdirs(); } if (!new File(serverPath + tempPath).isDirectory()) { new File(serverPath + tempPath).mkdirs(); } DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(thresholdSize); // 最大缓存 factory.setRepository(new File(serverPath + tempPath));// 临时文件目录 ServletFileUpload upload = new ServletFileUpload(factory); upload.setSizeMax(maxSize);// 文件最大上限 List<String> filePaths = new ArrayList<String>(); List<FileItem> items; try { items = upload.parseRequest(request); // 获取所有文件列表 for (FileItem item : items) { // 获得文件名，文件名包括路径 if (!item.isFormField()) { // 如果是文件 // 文件名 String fileName = item.getName().replace("\\", "/"); //文件后缀名 String suffix = null; if (fileName.lastIndexOf(".") > -1) { suffix = fileName.substring(fileName.lastIndexOf(".")); } else { //如果文件没有后缀名，不处理，直接跳过本次循环 continue; } // 不包含路径的文件名 String SimpleFileName = fileName; if (fileName.indexOf("/") > -1) { SimpleFileName = fileName.substring(fileName .lastIndexOf("/") + 1); } // 如果文件类型字符串中包含该后缀名，保存该文件 if (fileTypes.indexOf(suffix.toLowerCase()) > -1) { String uuid = UUID.randomUUID().toString(); SimpleDateFormat sf = new SimpleDateFormat("yyyyMMddHHmmss"); String absoluteFilePath = serverPath + relativeUploadPath + sf.format(new Date()) + " " + uuid + " " + SimpleFileName; item.write(new File(absoluteFilePath)); filePaths.add(absoluteFilePath); } } } } catch (FileUploadException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return filePaths; } /** * 文件上传 * * @param request HttpServletRequest * @param relativeUploadPath 上传文件保存的相对路径，例如"upload/"，注意，末尾的"/"不要丢了 * @param maxSize 上传的最大文件尺寸，单位字节 * @param fileTypes 文件类型，会根据上传文件的后缀名判断。<br> * 比如支持上传jpg,jpeg,gif,png图片,那么此处写成".jpg .jpeg .gif .png",<br> * 也可以写成".jpg/.jpeg/.gif/.png"，类型之间的分隔符是什么都可以，甚至可以不要，<br> * 直接写成".jpg.jpeg.gif.png"，但是类型前边的"."不能丢 * @return */ public static List<String> upload(HttpServletRequest request, String relativeUploadPath, int maxSize, String fileTypes) { return upload(request, relativeUploadPath, maxSize, 5*1024, fileTypes); } /** * 文件上传，不限大小 * * @param request HttpServletRequest * @param relativeUploadPath 上传文件保存的相对路径，例如"upload/"，注意，末尾的"/"不要丢了 * @param fileTypes 文件类型，会根据上传文件的后缀名判断。<br> * 比如支持上传jpg,jpeg,gif,png图片,那么此处写成".jpg .jpeg .gif .png",<br> * 也可以写成".jpg/.jpeg/.gif/.png"，类型之间的分隔符是什么都可以，甚至可以不要，<br> * 直接写成".jpg.jpeg.gif.png"，但是类型前边的"."不能丢 * @return */ public static List<String> upload(HttpServletRequest request, String relativeUploadPath, String fileTypes) { return upload(request, relativeUploadPath, -1, 5*1024, fileTypes); } }