1.頁面上遍歷checkbox
$("#checkAll").click(function(){
if(this.checked){
$(".thesisCheck").attr("checked", true);
}else{
$(".thesisCheck").attr("checked", false);
}
});
//批量下載
function plDownload(){
var valArr = new Array;
var c=0;
$('input[name="selectThesis"]:checked').each(function(i){
valArr[i] = $(this).val();
c++;
});
if(c==0){
alert("請選擇需要下載的文件！");
return;
}else{
var vals = valArr.join(',');//轉換爲逗號隔開的字符串
if(c==1){
window.location.href = "../thesis/download.do?tcLwId="+vals;
}else{
window.location.href = "../thesis/downloadZip.do?tcLwIds="+vals;
}
}
}
//教師論文批量打包下載
/**
* 批量打包下載文件生成zip文件下載* @param session
*/
@RequestMapping("downloadZip.do")
public String downloadFiles(String tcLwIds,HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
List<File> files = new ArrayList<File>();
System.out.println("需要批量下載的教師論文文件id：tcLwIds:"+tcLwIds);
if(""==tcLwIds||null==tcLwIds){
System.out.println("下載的文件不存在");
return "redirect:tclist.do";
}
String[] tcLwIdArray = tcLwIds.split(",");
for(String tcLwId : tcLwIdArray)
{
ThesisCompetitionBean tc = thesisCompetitionService.getTcById(tcLwId);
File file = new File(request.getSession().getServletContext().getRealPath("/")
+ "/thesisCompetition/uploadFile/" + tc.getThesisUrl());
files.add(file);
}
String fileName = UUID.randomUUID().toString() + ".zip";
//在服務器端創建打包下載的臨時文件
String outFilePath = request.getSession().getServletContext().getRealPath("/")
+ "/thesisCompetition/uploadFile/";
createFile(outFilePath,fileName);
File file = new File(outFilePath+fileName);
//文件輸出流
FileOutputStream outStream = new FileOutputStream(file);
//壓縮流
ZipOutputStream toClient = new ZipOutputStream(outStream);
toClient.setEncoding("gbk");
zipFile(files, toClient);
toClient.close();
outStream.close();
this.downloadFile(file, response,true);
return null;
}
//創建文件
public void createFile(String path,String fileName){
//path表示你所創建文件的路徑
File f = new File(path);
/*if(!f.exists()){
f.mkdirs();
} */
// fileName表示你創建的文件名；爲txt類型；
File file = new File(f,fileName);
if(!file.exists()){
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 壓縮文件列表中的文件
* @param files
* @param outputStream
* @throws IOException
*/
public static void zipFile(List<File> files, ZipOutputStream outputStream) throws IOException,ServletException
{
try {
int size = files.size();
// 壓縮列表中的文件
for (int i = 0; i < size; i++) {
File file = (File) files.get(i);
zipFile(file, outputStream);
}
} catch (IOException e) {
throw e;
}
}
/**
* 將文件寫入到zip文件中
*
* @param inputFile
* @param outputstream
* @throws Exception
*/
public static void zipFile(File inputFile, ZipOutputStream outputstream) throws IOException,ServletException
{
try {
if (inputFile.exists()) {
if (inputFile.isFile()) {
FileInputStream inStream = new FileInputStream(inputFile);
BufferedInputStream bInStream = new BufferedInputStream(
inStream);
ZipEntry entry = new ZipEntry(inputFile.getName());
outputstream.putNextEntry(entry);
final int MAX_BYTE = 10 * 1024 * 1024; // 最大的流爲10M
long streamTotal = 0; // 接受流的容量
int streamNum = 0; // 流需要分開的數量
int leaveByte = 0; // 文件剩下的字符數
byte[] inOutbyte; // byte數組接受文件的數據
streamTotal = bInStream.available(); // 通過available方法取得流的最大字符數
streamNum = (int) Math.floor(streamTotal / MAX_BYTE); // 取得流文件需要分開的數量
leaveByte = (int) streamTotal % MAX_BYTE; // 分開文件之後,剩餘的數量
if (streamNum > 0) {
for (int j = 0; j < streamNum; ++j) {
inOutbyte = new byte[MAX_BYTE];
// 讀入流,保存在byte數組
bInStream.read(inOutbyte, 0, MAX_BYTE);
outputstream.write(inOutbyte, 0, MAX_BYTE); // 寫出流
}
}
// 寫出剩下的流數據
inOutbyte = new byte[leaveByte];
bInStream.read(inOutbyte, 0, leaveByte);
outputstream.write(inOutbyte);
outputstream.closeEntry(); // Closes the current ZIP entry
// and positions the stream for
// writing the next entry
bInStream.close(); // 關閉
inStream.close();
}
} else {
throw new ServletException("文件不存在！");
}
} catch (IOException e) {
throw e;
}
}
/**
* 下載文件
* @param file
* @param response
*/
public void downloadFile(File file,HttpServletResponse response,boolean isDelete) {
try {
// 以流的形式下載文件。
BufferedInputStream 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");
response.setHeader("Content-Disposition", "attachment;filename=" + new String(file.getName().getBytes("UTF-8"),"ISO-8859-1"));
toClient.write(buffer);
toClient.flush();
toClient.close();
if(isDelete)
{
file.delete(); //是否將生成的服務器端文件刪除
}
}
catch (IOException ex) {
ex.printStackTrace();
}
}
