This class can compress multiple files and return streams. In the program, you can operate the returned streams for other functions, such as verifying MD5. Let's look at the code below.
The code copy is as follows:
/**
* Method description: <b>Test class</b></br>
*/
public class TestFileStream{
//Storage location of files and compressed packages
StringtempFilePath="C:/temp/"
List<String>fileList=newArrayList<String>();
fileList.add(tempFilePath+"file1.txt");
fileList.add(tempFilePath+"file2.png");
fileList.add(tempFilePath+"file3.xls");
//The generated compressed package name
StringzipName="fileData";
//Return to the stream
ByteArrayOutputStreamoutputStream=fileToZip(fileList,fileData,tempFilePath);
//Page input compressed packet flow
byte[]buffer=outputStream.toByteArray();
//Clear response
response.reset();
//Set the response header
response.addHeader("Content-Disposition",
"attachment;filename="+
newString(("dataFile.zip").getBytes("gb2312"),"ISO8859-1"));
response.addHeader("Content-Length",""+outputStream.size());
toClient=newBufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
}
/**
*Method description: <b>Compress multiple files into zip packages</b></br>
*/
publicByteArrayOutputStreamfileToZip(List<String>fileList,StringzipName,StringtempFilePath){
byte[]buffer=newbyte[1024];
ZipOutputStreamout=null;
try{
out=newZipOutputStream(newFileOutputStream(tempFilePath+zipName+".zip"));
List<File>filedata=newArrayList<File>();
for(inti=0,len=fileList.size();i<len;i++)
{
filedata.add(newFile(fileList.get(i)));
}
for(intj=0,len=filedata.size();j<len;j++)
{
FileInputStreamfis=newFileInputStream(filedata.get(j));
out.putNextEntry(newZipEntry(filedata.get(j).getName()));
intdataLen;
//Read the content of the file you need to download and package it into the zip file
while((dataLen=fis.read(buffer))>0){
out.write(buffer,0,dataLen);
}
out.closeEntry();
fis.close();
}
out.close();
}
catch(Exceptionex)
{
ex.printStackTrace();
}
//Read the compressed package
Filefilezip=newFile(tempFilePath+zipName+".zip");
ByteArrayOutputStreambaos=null;
try
{
baos=newByteArrayOutputStream();
FileInputStreaminStream=newFileInputStream(filezip);
BufferedInputStreambis=newBufferedInputStream(inStream);
intc=bis.read();
while(c!=-1){
baos.write(c);
c=bis.read();
}
bis.close();
inStream.close();
}
catch(Exceptionex)
{
ex.printStackTrace();
}
returnbaos;
}