Java GZIP压缩与解压缩代码实例

Java GZIP压缩与解压缩代码实例

这篇文章主要介绍了java GZIP压缩与解压缩代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

1.GZIP压缩

public static byte[] compress(String str, String encoding) {

if (str == null || str.length() == 0) {

return null;

}

ByteArrayOutputStream out = new ByteArrayOutputStream();

GZIPOutputStream gzip;

try {

gzip = new GZIPOutputStream(out);

gzip.write(str.getBytes(encoding));

gzip.close();

} catch ( Exception e) {

e.printStackTrace();

}

return out.toByteArray();

}

2.GZIP解压缩

public static byte[] uncompress(byte[] bytes) {

if (bytes == null || bytes.length == 0) {

return null;

}

ByteArrayOutputStream out = new ByteArrayOutputStream();

ByteArrayInputStream in = new ByteArrayInputStream(bytes);

try {

GZIPInputStream ungzip = new GZIPInputStream(in);

byte[] buffer = new byte[256];

int n;

while ((n = ungzip.read(buffer)) >= 0) {

out.write(buffer, 0, n);

}

} catch (Exception e) {

e.printStackTrace();

}

return out.toByteArray();

}

3.工具代码集合

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.util.zip.GZIPInputStream;

import java.util.zip.GZIPOutputStream;

public class GZIPUtils {

public static final String GZIP_ENCODE_UTF_8 = "UTF-8";

public static final String GZIP_ENCODE_ISO_8859_1 = "ISO-8859-1";

public static byte[] compress(String str, String encoding) {

if (str == null || str.length() == 0) {

return null;

}

ByteArrayOutputStream out = new ByteArrayOutputStream();

GZIPOutputStream gzip;

try {

gzip = new GZIPOutputStream(out);

gzip.write(str.getBytes(encoding));

gzip.close();

} catch ( Exception e) {

e.printStackTrace();

}

return out.toByteArray();

}

public static byte[] compress(String str) throws IOException {

return compress(str, GZIP_ENCODE_UTF_8); MhoSDlzL

}

public static byte[] uncompress(byte[] bytes) {

if (bytes == null || bytes.length == 0) {

return null;

}

ByteArrayOutputStream out = new ByteArrayOutputStream();

ByteArrayInputStream in = new ByteArrayInputStream(bytes);

try {

GZIPInputStream ungzip = nhttp://ew GZIPInputStream(in);

byte[] buffer = new byte[256];

int n;

while ((n = ungzip.read(buffer)) >= 0) {

out.write(buffer, 0, n);

}

} catch (Exception e) {

e.printStackTrace();

}

return out.toByteArray();

}

public static String uncompressToString(byte[] bytes, String encoding) {

if (bytes == null || bytes.length == 0) {

return null;

}

ByteArrayOutputStream out = new ByteArrayOutputStream();

ByteArrayInputStream in = new ByteArrayInputStream(bytes);

try {

GZIPInputStream ungzip = new GZIPInputStream(in);

byte[] buffer = new byte[256];

int n;

while ((n = ungzip.read(buffer)) >= 0) {

out.write(buffer, 0, n);

}

return out.toString(encoding);

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

public static String uncompressToString(byte[] bytes) {

return uncompressToString(bytes, GZIP_ENCODE_UTF_8);

}

public static void main(String[] args) throws IOException {

String s = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";

System.out.println("字符串长度："+s.length());

System.out.println("压缩后：："+compress(s).length);

System.out.println("解压后："+uncompress(compress(s)).length);

System.out.println("解压字符串后：："+uncompressToString(compress(s)).length());

}

}

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。