CompressStringUtil类:
不多说，直接贴代码：
/**
* 压缩
*
* @param paramString
* @return
*/
public static final byte[] compress(String paramString) throws Exception {
if (paramString == null)
return null;
ByteArrayOutputStream byteArrayOutputStream = null;
ZipOutputStream zipOutputStream = null;
byte[] arrayOfByte;
try {
byteArrayOutputStream = new ByteArrayOutputStream();
zipOutputStream = new ZipOutputStream(byteArrayOutputStream);
zipOutputStream.putNextEntry(new ZipEntry("0"));
zipOutputStream.write(paramString.getBytes("GBK"));//这里采用gbk方式压缩，如果采用编译器默认的utf-8，这里就直接getByte();
zipOutputStream.closeEntry();
arrayOfByte = byteArrayOutputStream.toByteArray();
} catch (IOException e) {
arrayOfByte = null;
throw new Exception("压缩字符串数据出错", e);
} finally {
if (zipOutputStream != null)
try {
zipOutputStream.close();
} catch (IOException e) {
LOGGER.debug("关闭zipOutputStream出错", e);
}
if (byteArrayOutputStream != null)
try {
byteArrayOutputStream.close();
} catch (IOException e) {
LOGGER.error("关闭byteArrayOutputStream出错", e);
}
}
return arrayOfByte;
}
/**
* 解压缩
*
* @param compressed
* @return
*/
public static String decompress(byte[] compressed) throws Exception {
if (compressed == null)
return null;
ByteArrayOutputStream out = null;
ByteArrayInputStream in = null;
ZipInputStream zin = null;
String decompressed;
try {
out = new ByteArrayOutputStream();
in = new ByteArrayInputStream(compressed);
zin = new ZipInputStream(in);
zin.getNextEntry();
byte[] buffer = new byte[1024];
int offset = -1;
while ((offset = zin.read(buffer)) != -1) {
out.write(buffer, 0, offset);
}
decompressed = out.toString("GBK");//相应的这里也要采用gbk方式解压缩，如果采用编译器默认的utf-8，这里就直接toString()就ok了
} catch (IOException e) {
decompressed = null;
throw new Exception("解压缩字符串数据出错", e);
} finally {
if (zin != null) {
try {
zin.close();
} catch (IOException e) {
LOGGER.debug("关闭ZipInputStream出错", e);
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
LOGGER.error("关闭ByteArrayInputStream出错", e);
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
LOGGER.debug("关闭ByteArrayOutputStream出错", e);
}
}
}
return decompressed;
}
测试：
public static void main(String[] args) throws Exception {
byte[] aa = compress("czy爱wt");
System.out.println("压缩后字段" + aa);
System.out.println("解压缩后字段" + decompress(aa));
}
为了做个比较，下面贴出gzip方式压缩和解压缩的demo（网上扣的，不做保证能运行）
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream; // 将一个字符串按照zip方式压缩和解压缩
public class ZipUtil { // 压缩
public static String compress(String str) throws IOException {
if (str == null || str.length() == 0) {
return str;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(out);
gzip.write(str.getBytes());
gzip.close();
return out.toString("ISO-8859-1");
} // 解压缩
public static String uncompress(String str) throws IOException {
if (str == null || str.length() == 0) {
return str;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(str
.getBytes("ISO-8859-1"));
GZIPInputStream gunzip = new GZIPInputStream(in);
byte[] buffer = new byte[256];
int n;
while ((n = gunzip.read(buffer)) >= 0) {
out.write(buffer, 0, n);
}
// toString()使用平台默认编码，也可以显式的指定如toString("GBK")
return out.toString();
} // 测试方法
public static void main(String[] args) throws IOException {
System.out.println(ZipUtil.uncompress(ZipUtil.compress("中国China")));
} }
over。。。