GZipUtils

功能：

---

• compress 压缩指定的数据
• decompress 解压指定的数据

源码：

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import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

/**
 * @author Dotions 2016年4月26日下午5:42:44
 */
public class GZipUtils {
    
    private static final String UTF_8 = "UTF-8";

    /**
     * @param data
     * @return
     */
    public static final byte[] compress(String data) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        GZIPOutputStream gzipOutputtStream = new GZIPOutputStream(out);
        try {
            gzipOutputtStream.write(data.getBytes(UTF_8));
        } finally {
            closeQuietly(gzipOutputtStream);
        }
        return out.toByteArray();
    }

    /**
     * @param data
     * @return
     */
    public static final byte[] compress(byte[] data) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        GZIPOutputStream gzipOutputtStream = new GZIPOutputStream(out);
        try {
            gzipOutputtStream.write(data);
        } finally {
            closeQuietly(gzipOutputtStream);
        }
        return out.toByteArray();
    }

    /**
     * @param data
     * @return
     */
    public static final byte[] decompress(byte[] data) throws IOException {
        ByteArrayOutputStream buffer = null;
        GZIPInputStream gizpInputStream = null;
        try {
            buffer = new ByteArrayOutputStream();
            gizpInputStream = new GZIPInputStream(new ByteArrayInputStream(data));
            int n = -1;
            byte[] _buffer = new byte[1024 * 12];
            while (-1 != (n = gizpInputStream.read(_buffer))) {
                buffer.write(_buffer, 0, n);
            }
            return buffer.toByteArray();
        } finally {
            closeQuietly(gizpInputStream);
            closeQuietly(buffer);
        }
    }

    /**
     * @param in
     * @return
     * @throws IOException
     */
    public static final byte[] decompress(InputStream in) throws IOException {
        ByteArrayOutputStream buffer = null;
        GZIPInputStream gizpInputStream = null;
        try {
            buffer = new ByteArrayOutputStream();
            gizpInputStream = new GZIPInputStream(in);
            int n = -1;
            byte[] _buffer = new byte[1024 * 12];
            while (-1 != (n = gizpInputStream.read(_buffer))) {
                buffer.write(_buffer, 0, n);
            }
            return buffer.toByteArray();
        } finally {
            closeQuietly(gizpInputStream);
            closeQuietly(buffer);
        }
    }

    private static void closeQuietly(Closeable closeable) {
        try {
            if (closeable != null) {
                closeable.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }
}