package com.hisuper.utils;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
/**
* ZLib压缩工具
*
* @author dhdu@qq.com
* @version 1.0
* @since 1.0
*/
public abstract class ZLibUtils {
/**
* 压缩
*
* @param data
* 待压缩数据
* @return byte[] 压缩后的数据
*/
public static byte[] compress(byte[] data) {
byte[] output = new byte[0];
Deflater compresser = new Deflater();
compresser.reset();
compresser.setInput(data);
compresser.finish();
ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length);
try {
byte[] buf = new byte[1024];
while (!compresser.finished()) {
int i = compresser.deflate(buf);
bos.write(buf, 0, i);
}
output = bos.toByteArray();
} catch (Exception e) {
output = data;
e.printStackTrace();
} finally {
try {
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
compresser.end();
return output;
}
/**
* 压缩
*
* @param data
* 待压缩数据
*
* @param os
* 输出流
*/
public static void compress(byte[] data, OutputStream os) {
DeflaterOutputStream dos = new DeflaterOutputStream(os);
try {
dos.write(data, 0, data.length);
dos.finish();
dos.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 解压缩
*
* @param data
* 待压缩的数据
* @return byte[] 解压缩后的数据
*/
public static byte[] decompress(byte[] data) {
byte[] output = new byte[0];
Inflater decompresser = new Inflater();
decompresser.reset();
decompresser.setInput(data);
ByteArrayOutputStream o = new ByteArrayOutputStream(data.length);
try {
byte[] buf = new byte[1024];
while (!decompresser.finished()) {
int i = decompresser.inflate(buf);
o.write(buf, 0, i);
}
output = o.toByteArray();
} catch (Exception e) {
output = data;
e.printStackTrace();
} finally {
try {
o.close();
} catch (IOException e) {
e.printStackTrace();
}
}
decompresser.end();
return output;
}
/**
* 解压缩
*
* @param is
* 输入流
* @return byte[] 解压缩后的数据
*/
public static byte[] decompress(InputStream is) {
InflaterInputStream iis = new InflaterInputStream(is);
ByteArrayOutputStream o = new ByteArrayOutputStream(1024);
try {
int i = 1024;
byte[] buf = new byte[i];
while ((i = iis.read(buf, 0, i)) > 0) {
o.write(buf, 0, i);
}
} catch (IOException e) {
e.printStackTrace();
}
return o.toByteArray();
}
}
