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java實(shí)現(xiàn)服務(wù)器文件打包zip并下載的示例(邊打包邊下載)

更新時間：2014年04月13日 09:18:40 作者：

這篇文章主要介紹了java實(shí)現(xiàn)服務(wù)器文件打包zip并下載的示例，使用該方法,可以即時打包文件,一邊打包一邊傳輸,不使用任何的緩存,讓用戶零等待,需要的朋友可以參考下

使用該方法,可以即時打包文件,一邊打包一邊傳輸,不使用任何的緩存,讓用戶零等待!

/**
*
* mySocket 客戶端 Socket
* @param file 待打包的文件夾或文件
* @param fileName 打包下載的文件名
* @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\n");
sb.append("Server: java/1.1\r\n");
sb.append("Content-Type:application/octet-stream;charset=UTF-8\r\n");
//sb.append("User-Agent: Mozilla/4.0 (compatible;MSIE6.0;Windows NT 5.0)\r\n");
sb.append("Content-Disposition: attachment; filename=" + fileName
   + "\r\n");
sb.append("Transfer-Encoding: chunked\r\n");
sb.append("Connection: Keep-Alive\r\n\r\n");
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\\n\\r\\n'");
outputStream.write("0\r\n\r\n".getBytes());//Transfer-Encoding: chunked傳輸結(jié)束標(biāo)記
outputStream.flush();
outputStream.close();
System.out.println("download stop");
try {
  mySocket.close();
} catch (Throwable t) {
}
}

復(fù)制代碼代碼如下:

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() + "不存在！");
  try {
   CheckedOutputStream cos = new CheckedOutputStream(outputStream,
     new CRC32());
   ZipOutputStream out = new ZipOutputStream(cos);
   String basedir = "";
   compress(file, out, basedir);
   out.close();//必須關(guān)閉,這樣才會寫入zip的結(jié)束信息,否則zip文件不完整.若想繼續(xù)寫入,可重寫outputStream.close()方法
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
}

private void compress(File file, ZipOutputStream out, String basedir) {
  //判斷是目錄還是文件
  if (file.isDirectory()) {
   System.out.println("壓縮：" + basedir + file.getName());
   this.compressDirectory(file, out, basedir);
  } else {
   System.out.println("壓縮：" + basedir + file.getName());
   this.compressFile(file, out, basedir);
  }
}

// 壓縮一個目錄
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++) {
   /** 遞歸 */
   compress(files[i], out, basedir + dir.getName() + "/");
  }
}

//壓縮一個文件
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);
  }
}
}

復(fù)制代碼代碼如下:

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\n".getBytes();
final byte[] rnBytes = "\r\n".getBytes();

public void write(int b) throws IOException {
  out.write(oneBytes);//字節(jié)數(shù)1+CRLF
  out.write(b);//數(shù)據(jù)實(shí)體
  out.write(rnBytes);//CRLF
}

public void write(byte[] b) throws IOException {
  out.write(Integer.toHexString(b.length).getBytes());//字節(jié)數(shù),十六進(jìn)制
  out.write(rnBytes);//CRLF
  out.write(b);//數(shù)據(jù)實(shí)體
  out.write(rnBytes);//CRLF
}

public void write(byte[] b, int off, int len) throws IOException {
  out.write(Integer.toHexString(len - off).getBytes());//字節(jié)數(shù),十六進(jìn)制
  out.write(rnBytes);//CRLF
  out.write(b, off, len);//數(shù)據(jù)實(shí)體
  out.write(rnBytes);//CRLF
}

/**
* 重寫該方法,否則OutputStream會被關(guān)閉,其他的數(shù)據(jù)<br/>
* (如Transfer-Encoding: chunked傳輸結(jié)束標(biāo)記)就不能再繼續(xù)寫入了
*/
public void close() throws IOException {
}
}

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