云存储文件下载功能

云存储文件下载功能目录技术原理实现步骤功能描述功能测试2技术原理3（1）视图层：显示文件下载界面（2）控制层：接收视图层的消息，向服务层发送文件下载参数（3）服务层：调用swift提供的下载接口实现文件下载功能描述4实现步骤5在cn/edu/sict/cloud/storage/service/SwiftStorageService.java添加如下代码public

byte[]download(Stringusername,Stringpath){SwiftDFSswiftdfs=newSwiftDFS();return

swiftdfs.downloadFile(username+"/"+path);}实现步骤6在cn/edu/sict/cloud/storage/sh/SwiftDFS.java添加如下代码public

byte[]downloadFile(Stringrpath){Mapmappath=this.getSplitPath(rpath);StringrootPath=mappath.get("rootPath").toString();Stringpath=mappath.get("path").toString();DLPayloaddl=os.objectStorage().objects().download(rootPath,path);InputStreamip=dl.getInputStream();byte[]in_b=null;ByteArrayOutputStreamswapStream=newByteArrayOutputStream();byte[]buff=new

byte[100];int

rc=0;实现步骤7在cn/edu/sict/cloud/storage/sh/SwiftDFS.java添加如下代码try{while((rc=ip.read(buff,0,100))>0){swapStream.write(buff,0,rc);}in_b=swapStream.toByteArray();swapStream.close();ip.close();}catch(IOExceptione){e.printStackTrace();}return

in_b;}实现步骤8在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码@RequestMapping("/download")public

voiddownload(HttpServletRequestrequest,HttpServletResponseresponse,Stringpaths){try{String[]strs=paths.split(",");int

len=strs.length;if(len<1){return;}Useruser=getSessionUser(request);response.setContentType("text/html;charset=UTF-8");request.setCharacterEncoding("UTF-8");BufferedInputStreambis=null;BufferedOutputStreambos=null;实现步骤9在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码Stringpath=request.getSession().getServletContext().getRealPath("/");StringctxPath=path+"export";if(len==1){Stringfilepath=strs[0];//(String)map.get("path");filepath=UtilTools.converStr(filepath);byte[]b=new

byte[]{};实现步骤10在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码if(storage

instanceofSwiftStorageService){b=((SwiftStorageService)storage).download(user.getUsername(),filepath);}if(storage

instanceofHadoopStorageService){String[]strsss=filepath.split("/");Stringfilename=strsss[strsss.length-1];StringdownLoadPath=ctxPath+File.separator+filename;((HadoopStorageService)storage).download(filepath,downLoadPath);}实现步骤11在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码String[]strsss=filepath.split("/");Stringfilename=strsss[strsss.length-1];StringdownLoadPath=ctxPath+File.separator+filename;FiledownLoadFile=newFile(downLoadPath);downLoadFile.createNewFile();BufferedOutputStreambuffer=newBufferedOutputStream(newFileOutputStream(downLoadFile));实现步骤12在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码buffer.write(b);buffer.flush();buffer.close();long

fileLength=downLoadFile.length();response.setContentType("application/octet-stream");response.setHeader("Content-disposition","attachment;filename="+newString(filename.getBytes("utf-8"),"ISO8859-1"));response.setHeader("Content-Length",String.valueOf(fileLength));bis=newBufferedInputStream(newFileInputStream(downLoadPath));实现步骤13在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码bos=newBufferedOutputStream(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();downLoadFile.delete();}else{实现步骤14在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码String[]strss=strs[0].split("/");Stringtemps=strss[strss.length-1];String[]strr=temps.split("\\.");strr[0]=UtilTools.converStr(strr[0]);Stringrootname=ctxPath+File.separator+strr[0];Filerfile=newFile(rootname);rfile.mkdir();for(int

i=0;i<len;i++){Stringfilepath=strs[i];//(String)map.get("path");filepath=UtilTools.converStr(filepath);byte[]b=new

byte[]{};if(storage

instanceofSwiftStorageService){b=((SwiftStorageService)storage).download(user.getUsername(),filepath);}实现步骤15在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码if(storage

instanceofHadoopStorageService){String[]strsss=filepath.split("/");Stringfilename=strsss[strsss.length-1];Stringdpath=rootname+File.separator+filename;((HadoopStorageService)storage).download(filepath,dpath);continue;}String[]strsss=filepath.split("/");Stringfilename=strsss[strsss.length-1];Stringdpath=rootname+File.separator+filename;Filedfile=newFile(dpath);dfile.createNewFile();实现步骤16在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码BufferedOutputStreambuff=newBufferedOutputStream(newFileOutputStream(dfile));buff.write(b);buff.flush();buff.close();}Filetarfile=newFile(rootname+".zip");tarfile.createNewFile();UtilTools.WriteToTarGzip(ctxPath+File.separator,strr[0],strr[0]+".zip");StringdownLoadPath=rootname+".zip";Stringfp="[批量下载]"

+strr[0]+".zip";FiledownLoadFile=newFile(downLoadPath);long

fileLength=downLoadFile.length();实现步骤17在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码response.setContentType("application/octet-stream");response.setHeader("Content-disposition","attachment;filename="+newString(fp.getBytes("utf-8"),"ISO8859-1"));response.setHeader("Content-Length",String.valueOf(fileLength));bis=newBufferedInputStream(newFileInputStream(downLoadPath));bos=newBufferedOutputStream(response.getOutputStream());byte[]buff=new

byte[2048];int

bytesRead;实现步骤18在cn/edu/sict/cloud/storage/Web/StorageController.java添加如下代码while(-1!=(bytesRead=bis.read(buff,0,buff.length))){bos.write(buff,0,bytesRead);}bis.close();bos.close();downLoadFile.delete();UtilTools.deletefile(rootname);}}catch(Exceptione){e.printStackTrace();}}实现步骤19为下载按钮绑定单击事件downloadfile()：functiondownloadfile(){varobjTable=document.getElementById("tab");vardata='';for(vary=0;y<objTable.rows.length;y++){varcheckbox=objTable.rows[y].childNodes[1].childNodes[0].childNodes[5];if(checkbox.checked==true){vartd3=checkbox.parentNode.parentNode.parentNode.childNodes[3];Varimgpic=td3.getElementsByTagName(“img”);If(imgpic.length>0){Alert("文件夹中内