WebUploader 文件上传优化总结

来源：互联网发布：游戏机算法编辑：程序博客网时间：2024/05/08 00:05
http://itindex.net/detail/49267-webuploader-%E6%96%87%E4%BB%B6-%E4%B8%8A%E4%BC%A0
WebUploader 文件上传优化总结

public void fileUpload(HttpServletRequest request, 
            HttpServletResponse response)throws ServletException {
        try{ 
            String path = request.getParameter("path");
            path = path !=null ? java.net.URLDecoder.decode(path,"utf-8") 
                    :""; 
            booleanisMultipart = ServletFileUpload.isMultipartContent(request);
  
            if(isMultipart) { 
                FileItemFactory factory =new DiskFileItemFactory();
                ServletFileUpload upload =new ServletFileUpload(factory);
  
                // 得到所有的表单域，它们目前都被当作FileItem                List<FileItem> fileItems = upload.parseRequest(request);
  
                String id =""; 
                String fileName =""; 
                // 如果大于1说明是分片处理                int chunks = 1; 
                intchunk = 0;
                FileItem tempFileItem =null; 
  
                for(FileItem fileItem : fileItems) { 
                    if(fileItem.getFieldName().equals("id")) {
                        id = fileItem.getString();
                    }else if(fileItem.getFieldName().equals("name")) {
                        fileName =new String(fileItem.getString().getBytes(
                                "ISO-8859-1"),"UTF-8"); 
                    }else if(fileItem.getFieldName().equals("chunks")) {
                        chunks = NumberUtils.toInt(fileItem.getString());
                    }else if(fileItem.getFieldName().equals("chunk")) {
                        chunk = NumberUtils.toInt(fileItem.getString());
                    }else if(fileItem.getFieldName().equals("file")) {
                        tempFileItem = fileItem;
                    }
                }
  
                // 临时目录用来存放所有分片文件                String tempFileDir = getTempFilePath()
                        + File.separator + id;
                File parentFileDir =new File(tempFileDir);
                if(!parentFileDir.exists()) { 
                    parentFileDir.mkdirs();
                }
                // 分片处理时，前台会多次调用上传接口，每次都会上传文件的一部分到后台(默认每片为5M)                File tempPartFile = newFile(parentFileDir, fileName + "_"+ chunk 
                        +".part"); 
                FileUtils.copyInputStreamToFile(tempFileItem.getInputStream(),
                        tempPartFile);
  
                // 是否全部上传完成                // 所有分片都存在才说明整个文件上传完成                boolean uploadDone = true; 
                for(int i = 0; i < chunks; i++) {
                    File partFile =new File(parentFileDir, fileName +"_" + i 
                            +".part"); 
                    if(!partFile.exists()) { 
                        uploadDone =false; 
                    }
                }
                // 所有分片文件都上传完成                // 将所有分片文件合并到一个文件中                if (uploadDone) { 
                    File destTempFile =new File(getTempFilePath(), fileName);
                    for(int i = 0; i < chunks; i++) {
                        File partFile =new File(parentFileDir, fileName +"_"
                                + i +".part"); 
  
                        FileOutputStream destTempfos =new FileOutputStream(
                                destTempFile,true); 
  
                        FileUtils.copyFile(partFile, destTempfos);
  
                        destTempfos.close();
                    }
                    // 得到 destTempFile 就是最终的文件                    // 添加到文件系统或者存储中                     
                    // 删除临时目录中的分片文件                    FileUtils.deleteDirectory(parentFileDir);
                    // 删除临时文件                    destTempFile.delete(); 
                      
                    ResponseUtil.responseSuccess(response,null); 
                }else { 
                    // 临时文件创建失败                    if (chunk == chunks -1) {
                        FileUtils.deleteDirectory(parentFileDir);
                        ResponseUtil.responseFail(response,"500", "内部错误");
                    }
                }
            }
        }catch (Exception e) {
            logger.error(e.getMessage(), e);
            ResponseUtil.responseFail(response,"500", "内部错误");
        }
    }
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