java 구현 서버 파일 압축 zip 및 다운로드 예시 (압축하면서 다운로드)

/**
 * 
 * mySocket   Socket
 * @param file  
 * @param fileName  
 * @throws IOException
 */
private void down(File file, String fileName) throws IOException {
 OutputStream outputStream = mySocket.getOutputStream();
 StringBuffer sb = new StringBuffer("HTTP/1.1 200 OK\r
");
 sb.append("Server: java/1.1\r
");
 sb.append("Content-Type:application/octet-stream;charset=UTF-8\r
");
 //sb.append("User-Agent: Mozilla/4.0 (compatible;MSIE6.0;Windows NT 5.0)\r
");
 sb.append("Content-Disposition: attachment; filename=" + fileName
   + "\r
");
 sb.append("Transfer-Encoding: chunked\r
");
 sb.append("Connection: Keep-Alive\r
\r
");
 outputStream.write(sb.toString().getBytes());
 outputStream.flush();
 ZipCompressor zipCompressor = new ZipCompressor(new MyOutputStream(
   outputStream));
 zipCompressor.compress(file);
 System.out.println("zip end");  
 System.out.println("write '0\\r\
\\r\
'");
 outputStream.write("0\r
\r
".getBytes());//Transfer-Encoding: chunked 
 outputStream.flush();
 outputStream.close();
 System.out.println("download stop");
 try {
  mySocket.close();
 } catch (Throwable t) {
 }
}

package cn.liangjintang.webserver.zipFile;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class ZipCompressor {
 static final int BUFFER = 8192;
 private OutputStream outputStream;
 public ZipCompressor(MyOutputStream outputStream) {
  this.outputStream=outputStream;
 }
 public void compress(File file) {
  if (!file.exists())
   throw new RuntimeException(file.getAbsolutePath() + " ！");
  try {
   CheckedOutputStream cos = new CheckedOutputStream(outputStream,
     new CRC32());
   ZipOutputStream out = new ZipOutputStream(cos);
   String basedir = "";
   compress(file, out, basedir);
   out.close();// , zip , zip . , outputStream.close() 
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
 }
 private void compress(File file, ZipOutputStream out, String basedir) {
  //  
  if (file.isDirectory()) {
   System.out.println(" ：" + basedir + file.getName());
   this.compressDirectory(file, out, basedir);
  } else {
   System.out.println(" ：" + basedir + file.getName());
   this.compressFile(file, out, basedir);
  }
 }
 //  
 private void compressDirectory(File dir, ZipOutputStream out, String basedir) {
  if (!dir.exists())
   return;
  File[] files = dir.listFiles();
  for (int i = 0; i < files.length; i++) {
   /**   */
   compress(files[i], out, basedir + dir.getName() + "/");
  }
 }
 // 
 private void compressFile(File file, ZipOutputStream out, String basedir) {
  if (!file.exists()) {
   return;
  }
  try {
   BufferedInputStream bis = new BufferedInputStream(
     new FileInputStream(file));
   ZipEntry entry = new ZipEntry(basedir + file.getName());
   out.putNextEntry(entry);
   int count;
   byte data[] = new byte[BUFFER];
   while ((count = bis.read(data, 0, BUFFER)) != -1) {
    out.write(data, 0, count);
   }
   bis.close();
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
 }
}

package cn.liangjintang.webserver.zipFile;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
public class MyOutputStream extends FilterOutputStream {
 public MyOutputStream(OutputStream out) {
  super(out);
 }
 final byte[] oneBytes = "1\r
".getBytes();
 final byte[] rnBytes = "\r
".getBytes();
 public void write(int b) throws IOException {
  out.write(oneBytes);// 1+CRLF
  out.write(b);// 
  out.write(rnBytes);//CRLF
 }
 public void write(byte[] b) throws IOException {
  out.write(Integer.toHexString(b.length).getBytes());// , 
  out.write(rnBytes);//CRLF
  out.write(b);// 
  out.write(rnBytes);//CRLF
 }
 public void write(byte[] b, int off, int len) throws IOException {
  out.write(Integer.toHexString(len - off).getBytes());// , 
  out.write(rnBytes);//CRLF
  out.write(b, off, len);// 
  out.write(rnBytes);//CRLF
 }
 /**
  *  , OutputStream , <br/>
  * ( Transfer-Encoding: chunked ) 
  */
 public void close() throws IOException {
 }
}