javaweb文件打包批量下载代码
本文实例为大家分享了javaweb文件打包批量下载，供大家参考，具体内容如下
//批量下载未批改作业
@RequestMapping(value="/downloadAllHomework",method=RequestMethod.GET)
publicvoiddownloadAllHomework(HttpSessionhttpSession,HttpServletRequestrequest,HttpServletResponseresponse,Stringassignmentid,intclassCode)throwsException{
Sitesite=(Site)httpSession.getAttribute("site");
Stringsiteid=site.getId();
//根据作业ID获取作业详细信息
AssignmentDetailassignmentDetail=assignmentServiceWS.getAssignmentDetail(assignmentid);
generateParameters(assignmentDetail);
//信息不完整，后面需要填充。
List<AssignmentSubmit>assignmentSubmitList=assignmentServiceWS.getSubmitedAssignmentStudent(assignmentid);
//获取所有的submitid
List<String>submitids=newArrayList<String>();
for(inti=0;i<assignmentSubmitList.size();i++){
Stringsubmitid=assignmentSubmitList.get(i).getId();
if(submitid==null||submitid=="")
continue;
submitids.add(submitid);
}
//获取提交详情
List<AssignmentSubmit>assignmentSubmits=newArrayList<AssignmentSubmit>();
for(Stringa:submitids){
AssignmentSubmitas=assignmentServiceWS.getSubmitAssignment(a);
assignmentSubmits.add(as);
}
//给每个已提交作业的学生配一个map，userName-->AssignmentSubmit
Map<String,AssignmentSubmit>studentSubmitMap=newHashMap<String,AssignmentSubmit>();
for(AssignmentSubmitassignmentSubmit:assignmentSubmits){
StringstudentID=assignmentSubmit.getUserName();
studentSubmitMap.put(studentID,assignmentSubmit);
}
//根据班级号获取该班所有学生的学号，再根据学号获取详情列表
List<AssignmentSubmit>assignmentStudentList=newArrayList<AssignmentSubmit>();
List<MemberVO>studentList=memberServiceWS.getStudents(siteid,classCode);
for(MemberVOstudent:studentList){
StringuserName=student.getId();
StringrealName=student.getName();
AssignmentSubmitassignmentSubmit=newAssignmentSubmit();
if(studentSubmitMap.get(userName)!=null){
assignmentSubmit=studentSubmitMap.get(userName);
}
assignmentSubmit.setRealName(realName);
assignmentSubmit.setUserName(userName);
generateA(assignmentSubmit);
assignmentStudentList.add(assignmentSubmit);
}
List<AssignmentSubmit>submitedList=newArrayList<AssignmentSubmit>();
for(AssignmentSubmitas:assignmentStudentList){
if(as.getGradePoint()==null&&as.getAssignmentID()!=null)
submitedList.add(as);
}
List<File>files=newArrayList<File>();
Filefile=newFile("d:/css.rar");
if(!file.exists()){
file.createNewFile();
}
response.reset();
//response.getWriter()
//创建文件输出流
FileOutputStreamfous=newFileOutputStream(file);
//打包的方法我们会用到ZipOutputStream这样一个输出流,所以这里我们把输出流转换一下
ZipOutputStreamzipOut=newZipOutputStream(fous);
for(AssignmentSubmita:submitedList){
for(AttachIDsaa:a.getAttachIDs()){
try{
StringfileId=aa.getId();
StringcloudFileUrl="http://xxx.xxx.xxx.xxx:8066/ImageService/DownloadFile/";
StringfileUrl=announceService.getAttachmentByFileid(fileId).getUrlUpload();
fileUrl=fileUrl.substring(fileUrl.lastIndexOf("/")+1);
fileUrl=cloudFileUrl+fileUrl;
StringfileName=announceService.getAttachmentByFileid(fileId).getName();//获取远程文件的文件名。
//response.addHeader("Content-Disposition","attachment;filename="+
//newString(fileName.getBytes("gbk"),"iso-8859-1"));
//iso-8859-1
ZipEntryentry=newZipEntry(newString(fileName.getBytes("gbk"),"iso-8859-1"));
zipOut.putNextEntry(entry);
URLurlfile=null;
HttpURLConnectionhttpUrl=null;
urlfile=newURL(fileUrl);
httpUrl=(HttpURLConnection)urlfile.openConnection();
httpUrl.connect();
InputStreamdownloadFile=httpUrl.getInputStream();
intlen=0;
byte[]buf=newbyte[1024];
while((len=downloadFile.read(buf,0,1024))!=-1){
zipOut.write(buf,0,len);
}
}catch(JSONExceptione){
e.printStackTrace();
}catch(UnsupportedEncodingExceptione){
e.printStackTrace();
}
}
}
zipOut.close();
fous.close();
downloadZip(file,response);
}
//把接受的全部文件打成压缩包
publicstaticHttpServletResponsedownloadZip(Filefile,HttpServletResponseresponse){
try{
//以流的形式下载文件。
InputStreamfis=newBufferedInputStream(newFileInputStream(file.getPath()));
byte[]buffer=newbyte[fis.available()];
fis.read(buffer);
fis.close();
//清空response
response.reset();
OutputStreamtoClient=newBufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
//如果输出的是中文名的文件，在此处就要用URLEncoder.encode方法进行处理
response.setHeader("Content-Disposition","attachment;filename="+URLEncoder.encode(file.getName(),"UTF-8"));
toClient.write(buffer);
toClient.flush();
toClient.close();
}catch(IOExceptionex){
ex.printStackTrace();
}finally{
try{
Filef=newFile(file.getPath());
f.delete();
}catch(Exceptione){
e.printStackTrace();
}
}
returnresponse;
}
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