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);
}
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();
}
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());
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
