javaweb文件打包批量下载代码

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)

public void downloadAllHomework(HttpSession httpSession, HttpServletRequest request, HttpServletResponse response, String assignmentid, int classCode) throws Exception {

Site site = (Site) httpSession.getAttribute("site");

String siteid = site.getId();

// 根据作业ID获取作业详细信息

AssignmentDetail assignmentDetail = assignmentServiceWS.getAssignmentDetail(assignmentid);

generateParameters(assignmentDetail);

// 信息不完整，后面需要填充。

List assignmentSubmitList = assignmentServiceWS.getSubmitedAssignmentStudent(assignmentid);

// 获取所有的submitid

List submitids = new ArrayList();

for (int i = 0; i < assignmentSubmitList.size(); i++) {

String submitid = assignmentSubmitList.get(i).getId();

if (submitid == null || submitid == "")

continue;

submitids.add(submitid);

}

// 获取提交详情

List assignmentSubmits = new ArrayList();

for (String a : submitids) {

AssignmentSubmit as = assignmentServiceWS.getSubmitAssignment(a);

assignmentSubmits.add(as);

}

// 给每个已提交作业的学生配一个map，userName-->AssignmentSubmit

Map studentSubmitMap = new HashMap

for (AssignmentSubmit assignmentSubmit : assignmentSubmits) {

String studentID = 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 assignmentStudentList = new ArrayList();

List studentList = memberServiceWS.getStudents(siteid, classCode);

for (MemberVO student : studentList) {

String userName = student.getId();

String realName = student.getName();

AssignmentSubmit assignmentSubmit = new AssignmentSubmit();

if (studentSubmitMap.get(userName) != null) {

assignmentSubmit = studentSubmitMap.get(userName);

}

assignmentSubmit.setRealName(realName);

assignmentSubmit.setUserName(userName);

generateA(assignmentSubmit);

assignmentStudentList.add(assignmentSubmit);

}

List submitedList = new ArrayList();

for (AssignmentSubmit as : assignmentStudentList) {

if (as.getGradePoint() == null && as.getAssignmentID() != null)

submitedList.add(as);

}

List files = new ArrayList();

File file = new File("d:/css.rar");

if (!file.exists()) {

file.createNewFile();

}

response.reset();

// response.getWriter()

// 创建文件输出流

FileOutputStream fous = new FileOutputStream(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

ZipOutputStream zipOut = new ZipOutputStream(fous);

for (AssignmentSubmit a : submitedList) {

for (AttachIDs aa : a.getAttachIDs()) {

try {

String fileId = aa.getId();

String cloudFileUrl = "http://xxx.xxx.xxx.xxx:8066/ImageService/DownloadFile/";

String fileUrl = announceService.getAttachmentByFileid(fileId).getUrlUpload();

fileUrl = fileUrl.substring(fileUrl.lastIndexOf("/") + 1);

fileUrl = cloudFileUrl + fileUrl;

String fileName = announceService.getAttachmentByFileid(fileId).getName(); // 获取远程文件的文件名。

// response.addHeader("Content-Disposition", "attachment;filename=" +

http:// // new String(fileName.getBytes("gbk"), "iso-8859-1"));

// iso-8859-1

ZipEntry entry = new ZipEntry(new String(fileName.getBytes("gbk"), "iso-8859-1"));

zipOut.putNextEntry(entry);

URL urlfile = null;

HttpURLConnection httpUrl = null;

urlfile = new URL(fileUrl);

httpUrl = (HttpURLConnection) urlfile.openConnection();

httpUrl.connect();

InputStream downloadFile = httpUrl.getInputStream();

int len = 0;

byte[] buf = new byte[1024];

while ((len = downloadFile.read(buf, 0, 1024)) != -1) {

zipOut.write(buf, 0, len);

}

} catch (jsONException e) {

e.printStackTrace();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

}

}

zipOut.close();

fous.close();

downloadZip(file, response);

}

// 把接受的全部文件打成压缩包

public static HttpServletResponse downloadZip(File file, HttpServletResponse response) {

try {

// 以流的形式下载文件。

InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));

byte[] buffer = new byte[fis.available()];

fis.read(buffer);

fis.close();

// 清空response

response.reset();

OutputStream toClient = new BufferedOutputStream(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 (IOException ex) {

ex.printStackTrace();

} finally {

try {

File f = new File(file.getPath());

f.delete();

} catch (Exception e) {

e.printStackTrace();

}

}

return response;

}

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for (AssignmentSubmit assignmentSubmit : assignmentSubmits) {

String studentID = 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 assignmentStudentList = new ArrayList();

List studentList = memberServiceWS.getStudents(siteid, classCode);

for (MemberVO student : studentList) {

String userName = student.getId();

String realName = student.getName();

AssignmentSubmit assignmentSubmit = new AssignmentSubmit();

if (studentSubmitMap.get(userName) != null) {

assignmentSubmit = studentSubmitMap.get(userName);

}

assignmentSubmit.setRealName(realName);

assignmentSubmit.setUserName(userName);

generateA(assignmentSubmit);

assignmentStudentList.add(assignmentSubmit);

}

List submitedList = new ArrayList();

for (AssignmentSubmit as : assignmentStudentList) {

if (as.getGradePoint() == null && as.getAssignmentID() != null)

submitedList.add(as);

}

List files = new ArrayList();

File file = new File("d:/css.rar");

if (!file.exists()) {

file.createNewFile();

}

response.reset();

// response.getWriter()

// 创建文件输出流

FileOutputStream fous = new FileOutputStream(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

ZipOutputStream zipOut = new ZipOutputStream(fous);

for (AssignmentSubmit a : submitedList) {

for (AttachIDs aa : a.getAttachIDs()) {

try {

String fileId = aa.getId();

String cloudFileUrl = "http://xxx.xxx.xxx.xxx:8066/ImageService/DownloadFile/";

String fileUrl = announceService.getAttachmentByFileid(fileId).getUrlUpload();

fileUrl = fileUrl.substring(fileUrl.lastIndexOf("/") + 1);

fileUrl = cloudFileUrl + fileUrl;

String fileName = announceService.getAttachmentByFileid(fileId).getName(); // 获取远程文件的文件名。

// response.addHeader("Content-Disposition", "attachment;filename=" +

http:// // new String(fileName.getBytes("gbk"), "iso-8859-1"));

// iso-8859-1

ZipEntry entry = new ZipEntry(new String(fileName.getBytes("gbk"), "iso-8859-1"));

zipOut.putNextEntry(entry);

URL urlfile = null;

HttpURLConnection httpUrl = null;

urlfile = new URL(fileUrl);

httpUrl = (HttpURLConnection) urlfile.openConnection();

httpUrl.connect();

InputStream downloadFile = httpUrl.getInputStream();

int len = 0;

byte[] buf = new byte[1024];

while ((len = downloadFile.read(buf, 0, 1024)) != -1) {

zipOut.write(buf, 0, len);

}

} catch (jsONException e) {

e.printStackTrace();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

}

}

zipOut.close();

fous.close();

downloadZip(file, response);

}

// 把接受的全部文件打成压缩包

public static HttpServletResponse downloadZip(File file, HttpServletResponse response) {

try {

// 以流的形式下载文件。

InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));

byte[] buffer = new byte[fis.available()];

fis.read(buffer);

fis.close();

// 清空response

response.reset();

OutputStream toClient = new BufferedOutputStream(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 (IOException ex) {

ex.printStackTrace();

} finally {

try {

File f = new File(file.getPath());

f.delete();

} catch (Exception e) {

e.printStackTrace();

}

}

return response;

}

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