StringCompressUtils.java
package javax.utils; import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream; import org.apache.commons.codec.binary.Base64; /**
* Java 字符串压缩工具
*
* @author Logan
* @version 1.0.0
*
*/
public class StringCompressUtils { /**
* 使用gzip进行压缩
*
* @param str 压缩前的文本
* @return 返回压缩后的文本
* @throws IOException 有异常时抛出，由调用者捕获处理
*/
public static String gzip(String str) throws IOException {
if (str == null || str.isEmpty()) {
return str;
} ByteArrayOutputStream out = new ByteArrayOutputStream();
try (
GZIPOutputStream gzip = new GZIPOutputStream(out);
) { gzip.write(str.getBytes()); } return Base64.encodeBase64String(out.toByteArray());
} /**
* 使用gzip进行解压缩
*
* @param compressedStr 压缩字符串
* @return 解压字符串
* @throws IOException 有异常时抛出，由调用者捕获处理
*/
public static String gunzip(String compressedStr) throws IOException {
if (compressedStr == null || compressedStr.isEmpty()) {
return compressedStr;
} byte[] compressed = Base64.decodeBase64(compressedStr);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(compressed); try (
GZIPInputStream ginzip = new GZIPInputStream(in);
) { byte[] buffer = new byte[4096];
int len = -1;
while ((len = ginzip.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
}
return out.toString();
} /**
* 使用zip进行压缩
*
* @param str 压缩前的文本
* @return 返回压缩后的文本
* @throws IOException 有异常时抛出，由调用者捕获处理
*/
public static String zip(String str) throws IOException {
if (null == str || str.isEmpty()) {
return str;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
try (
ZipOutputStream zout = new ZipOutputStream(out);
) {
zout.putNextEntry(new ZipEntry("0"));
zout.write(str.getBytes());
zout.closeEntry();
}
return Base64.encodeBase64String(out.toByteArray());
} /**
* 使用zip进行解压缩
*
* @param compressed 压缩后的文本
* @return 解压后的字符串
* @throws IOException 有异常时抛出，由调用者捕获处理
*/
public static final String unzip(String compressedStr) throws IOException {
if (null == compressedStr || compressedStr.isEmpty()) {
return compressedStr;
} byte[] compressed = Base64.decodeBase64(compressedStr);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(compressed); try (
ZipInputStream zin = new ZipInputStream(in);
) {
zin.getNextEntry();
byte[] buffer = new byte[4096];
int len = -1;
while ((len = zin.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
}
return out.toString();
}
}