package com.test.java.zip; 
import java.io.BufferedInputStream;
 
import java.io.BufferedOutputStream;
 
import java.io.ByteArrayInputStream;
 
import java.io.ByteArrayOutputStream;
 
import java.io.FileInputStream;
 
import java.io.FileOutputStream;
 
import java.io.IOException;
 
import java.util.zip.ZipEntry;
 
import java.util.zip.ZipInputStream;
 
import java.util.zip.ZipOutputStream;
 
/**
 

   
    
 

    
     
 
@author jrwangxin1 字节数组压缩解压工具
 
/
 
public class ZipUtil {
 /** 压缩 /
 
public static byte[] zip(byte[] source) throws IOException {
 
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
 
ZipOutputStream zipOutputStream = new ZipOutputStream(byteArrayOutputStream);
 
zipOutputStream.putNextEntry(new ZipEntry("0"));
 
BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(zipOutputStream);
 
bufferedOutputStream.write(source);
 
bufferedOutputStream.close();
 
return byteArrayOutputStream.toByteArray();
 
}
 
/** 解压 */
 
public static byte[] unzip(byte[] source) throws IOException {
 
ZipInputStream zipInputStream = new ZipInputStream(new ByteArrayInputStream(source));
 
while (zipInputStream.getNextEntry() != null) {
 
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
 
     </span><span style="color: #0000ff">byte</span>[] buffer = <span style="color: #0000ff">new</span> <span style="color: #0000ff">byte</span>[4096<span style="color: #000000">]; 
     </span><span style="color: #0000ff">int</span> i=0<span style="color: #000000">; 
     </span><span style="color: #0000ff">while</span> ((i = zipInputStream.read(buffer)) != -1<span style="color: #000000">) { 
         byteArrayOutputStream.write(buffer,</span>0<span style="color: #000000">,i); 
     } 
     </span><span style="color: #0000ff">return</span><span style="color: #000000"> byteArrayOutputStream.toByteArray(); 
 } 
 </span><span style="color: #0000ff">return</span> <span style="color: #0000ff">null</span><span style="color: #000000">; 
 
}
 
public static void main(String[] args) throws IOException {
 
// 读文件
 
String file = "E:/pic.jpg";
 
String outFile = "E:/picunzip.jpg";
 
BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(file));
 
byte[] bytes1 = new byte[bufferedInputStream.available()];
 
bufferedInputStream.read(bytes1);
 
bufferedInputStream.close();
 
System.out.println("压缩前大小: " + bytes1.length);
 
// 压缩
 
byte[] bytes2 = ZipUtil.zip(bytes1);
 
System.out.println("压缩后大小: " + bytes2.length);
 
// 解压
 
byte[] bytes3 = ZipUtil.unzip(bytes2);
 
System.out.println("unzip解压后大小: " + bytes3.length);
 
 </span><span style="color: #008000">//</span><span style="color: #008000"> 输出到文件以便验证</span> 
 BufferedOutputStream bufferedOutputStream = <span style="color: #0000ff">new</span> BufferedOutputStream(<span style="color: #0000ff">new</span><span style="color: #000000"> FileOutputStream(outFile)); 
 bufferedOutputStream.write(bytes3); 
 bufferedOutputStream.close(); 
 
}
 
}