JDK 自带压缩解压流

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();

}

}