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這個類可以壓縮多個文件并且返回流，在程序中可以再操作返回的流做其它功能，比如驗證MD5，下面看代碼吧

/**
* 方法描述：測試類
*/
public class TestFileStream{
//文件和壓縮包存儲的位置
StringtempFilePath="C:/temp/"
List<String>fileList=newArrayList<String>();
fileList.add(tempFilePath+"file1.txt");
fileList.add(tempFilePath+"file2.png");
fileList.add(tempFilePath+"file3.xls");
//生成的壓縮包名稱
StringzipName="fileData";
//返回流
ByteArrayOutputStreamoutputStream=fileToZip(fileList,fileData,tempFilePath);
//頁面輸入壓縮包流
byte[]buffer=outputStream.toByteArray();
//清空response
response.reset();
//設置response的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();
}

/**
*方法描述：將多個文件壓縮成zip包
*/
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;
//讀入需要下載的文件的內容，打包到zip文件
while((dataLen=fis.read(buffer))>0){
out.write(buffer,0,dataLen);

}
out.closeEntry();
fis.close();

}
out.close();
}
catch(Exceptionex)
{
ex.printStackTrace();
}
//讀取壓縮包
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;
}