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這篇文章主要介紹了Java GZIP壓縮與解壓縮代碼實例,文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下
1.GZIP壓縮
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解壓縮
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.工具代碼集合
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("字符串長度："+s.length());
System.out.println("壓縮后：："+compress(s).length);
System.out.println("解壓后："+uncompress(compress(s)).length);
System.out.println("解壓字符串后：："+uncompressToString(compress(s)).length());
}
}
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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