java代码同时下载_java代码实现打包多个文件下载功能
/**
* 把接受的全部文件打成壓縮包
* @param List;
* @param org.apache.tools.zip.ZipOutputStream
*/
public static void zipFile
(List files,ZipOutputStream outputStream) {
int size = files.size();
for(int i = 0; i < size; i++) {
File file = (File) files.get(i);
zipFile(file, outputStream);
}
}
public static HttpServletResponse downloadZip(File file,HttpServletResponse response) {
try {
// 以流的形式下載文件。
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");
response.setHeader("Content-Disposition", "attachment;filename=" + file.getName());
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;
}
/**
* 根據(jù)輸入的文件與輸出流對文件進(jìn)行打包
* @param File
* @param org.apache.tools.zip.ZipOutputStream
*/
public static void zipFile(File inputFile,
ZipOutputStream ouputStream) {
try {
if(inputFile.exists()) {
/**如果是目錄的話這里是不采取操作的，
* 至于目錄的打包正在研究中*/
if (inputFile.isFile()) {
FileInputStream IN = new FileInputStream(inputFile);
BufferedInputStream bins = new BufferedInputStream(IN, 512);
//org.apache.tools.zip.ZipEntry
ZipEntry entry = new ZipEntry(inputFile.getName());
ouputStream.putNextEntry(entry);
// 向壓縮文件中輸出數(shù)據(jù)
int nNumber;
byte[] buffer = new byte[512];
while ((nNumber = bins.read(buffer)) != -1) {
ouputStream.write(buffer, 0, nNumber);
}
// 關(guān)閉創(chuàng)建的流對象
bins.close();
IN.close();
} else {
try {
File[] files = inputFile.listFiles();
for (int i = 0; i < files.length; i++) {
zipFile(files[i], ouputStream);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
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