net.sf.hajdbc.util.ZipUtils Maven / Gradle / Ivy
package net.sf.hajdbc.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
public class ZipUtils {
/**
* 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();
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;
}
/**
* 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();
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;
}
public static void main(String[] args) {
StringBuilder s = new StringBuilder("[email protected];[email protected];zlex.dongliang@zl");
for(int i=0;i<10;i++){
s.append(" i=")
.append(i)
.append(";");
test(s.toString());
}
}
private static void test(String s) {
System.out.println("");
System.out.println("输入字符串:\t" + s);
byte[] input = s.getBytes();
System.out.println("输入字节长度:\t" + input.length);
byte[] data = ZipUtils.compress(input);
System.out.println("压缩后字节长度:\t" + data.length);
byte[] output = ZipUtils.decompress(data);
System.out.println("解压缩后字节长度:\t" + output.length);
String outputStr = new String(output);
System.out.println("输出字符串:\t" + outputStr);
}
}