Java 使用zlib压缩和解压字符

在工作中接触到了压缩与解压字符串。先看效果如下

上代码

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;


/**
 * zlib压缩工具类
 */
public class ZLibUtils {

	// 压缩直接数组
	public static byte[] compress(byte[] data) {
		byte[] output = new byte[0];
		Deflater compresser = new Deflater();
		compresser.reset();
		compresser.setInput(data);
		compresser.finish();
		ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length);
		try {
			byte[] buf = new byte[1024];
			while (!compresser.finished()) {
				int i = compresser.deflate(buf);
				bos.write(buf, 0, i);
			}
			output = bos.toByteArray();
		} catch (Exception e) {
			output = data;
			e.printStackTrace();
		} finally {
			try {
				bos.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		compresser.end();
		return output;
	}

	// 压缩 字节数组到输出流
	public static void compress(byte[] data, OutputStream os) {
		DeflaterOutputStream dos = new DeflaterOutputStream(os);
		try {
			dos.write(data, 0, data.length);
			dos.finish();
			dos.flush();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	// 解压缩 字节数组
	public static byte[] decompress(byte[] data) {
		byte[] output = new byte[0];
		Inflater inflater = new Inflater();
		inflater.reset();
		inflater.setInput(data);
		ByteArrayOutputStream outputStream  = new ByteArrayOutputStream(data.length);
		try {
			byte[] result  = new byte[1024];
			while (!inflater.finished()) {
				int count  = inflater.inflate(result );
				outputStream .write(result , 0, count );
			}
			output = outputStream .toByteArray();
		} catch (Exception e) {
			output = data;
			e.printStackTrace();
		} finally {
			try {
				outputStream .close();
				inflater.end();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return output;
	}
	// 解压缩 字节数组
	public static String decompress_str(byte[] data) {
		byte[] output = new byte[0];
		Inflater inflater = new Inflater();
		inflater.reset();
		inflater.setInput(data);
		ByteArrayOutputStream outputStream  = new ByteArrayOutputStream(data.length);
		try {
			byte[] buf = new byte[1024];
			while (!inflater.finished()) {
				int count  = inflater.inflate(buf);
				outputStream .write(buf, 0, count );
			}
			output = outputStream.toByteArray();
		} catch (Exception e) {
			output = data;
			e.printStackTrace();
		} finally {
			try {
				outputStream .close();
				inflater.end();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return "";
	}
	// 解压缩 输入流 到字节数组
	public static byte[] decompress(InputStream is) {
		InflaterInputStream iis = new InflaterInputStream(is);
		ByteArrayOutputStream outputStream = new ByteArrayOutputStream(1024);
		try {
			int i = 1024;
			byte[] buf = new byte[i];
			while ((i = iis.read(buf, 0, i)) > 0) {
				outputStream.write(buf, 0, i);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		return outputStream.toByteArray();
	}
}