字符串压缩

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
 
import sun.misc.BASE64Decoder;
 
public class StringCompression {
    public static final byte[] compress(String str) {
        if (str == null)
            return null;
 
        byte[] compressed;
        ByteArrayOutputStream out = null;
        ZipOutputStream zout = null;
 
        try {
            out = new ByteArrayOutputStream();
            zout = new ZipOutputStream(out);
            zout.putNextEntry(new ZipEntry("0"));
            zout.write(str.getBytes());
            zout.closeEntry();
            compressed = out.toByteArray();
        } catch (IOException e) {
            compressed = null;
        } finally {
            if (zout != null) {
                try {
                    zout.close();
                } catch (IOException e) {
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                }
            }
        }
 
        return compressed;
    }
 
    /**
     * 将压缩后的 byte[] 数据解压缩
     * 
     * @param compressed
     *            压缩后的 byte[] 数据
     * @return 解压后的字符串
     */
    public static final String decompress(byte[] compressed) {
        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);
            ZipEntry entry = zin.getNextEntry();
            byte[] buffer = new byte[1024];
            int offset = -1;
            while ((offset = zin.read(buffer)) != -1) {
                out.write(buffer, 0, offset);
            }
            decompressed = out.toString();
        } catch (IOException e) {
            decompressed = null;
        } finally {
            if (zin != null) {
                try {
                    zin.close();
                } catch (IOException e) {
                }
            }
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                }
            }
        }
 
        return decompressed;
    }