数据压缩java_Java实现数据压缩 zlib

r囧r小猫 2022-11-05 11:55 215阅读 0赞

packagecom.ecer.common.utils;

importjava.io.\*;

importjava.util.zip.Deflater;

importjava.util.zip.DeflaterOutputStream;

importjava.util.zip.Inflater;

importjava.util.zip.InflaterInputStream;

/\*\*\* Created by JiangChunyan on 2016/11/16.\* Java实现数据压缩\* ZLib压缩工具\*/public abstract classZLibUtils \{

/\*\*\*压缩\*\*@paramdata\*待压缩数据\*@returnbyte\[\]压缩后的数据\*/public static byte\[\] compress(byte\[\] data) \{

byte\[\] output = new byte\[0\];

Deflater compresser = newDeflater();

compresser.reset();

compresser.setInput(data);

compresser.finish();

ByteArrayOutputStream bos = newByteArrayOutputStream(data.length);

try\{

byte\[\] buf = new byte\[1024\];

while(!compresser.finished()) \{

inti = 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();

returnoutput;

/\*\*\*压缩\*\*@paramdata\*待压缩数据\*\*@paramos\*输出流\*/public static voidcompress(byte\[\] data, OutputStream os) \{

DeflaterOutputStream dos = newDeflaterOutputStream(os);

try\{

dos.write(data, 0, data.length);

dos.finish();

dos.flush();

\} catch(IOException e) \{

e.printStackTrace();

/\*\*\*解压缩\*\*@paramdata\*待压缩的数据\*@returnbyte\[\]解压缩后的数据\*/public static byte\[\] decompress(byte\[\] data) \{

byte\[\] output = new byte\[0\];

Inflater decompresser = newInflater();

decompresser.reset();

decompresser.setInput(data);

ByteArrayOutputStream o = newByteArrayOutputStream(data.length);

try\{

byte\[\] buf = new byte\[1024\];

while(!decompresser.finished()) \{

inti = decompresser.inflate(buf);

o.write(buf, 0, i);

output = o.toByteArray();

\} catch(Exception e) \{

output = data;

e.printStackTrace();

\} finally\{

try\{

o.close();

\} catch(IOException e) \{

e.printStackTrace();

decompresser.end();

returnoutput;

/\*\*\*解压缩\*\*@paramis\*输入流\*@returnbyte\[\]解压缩后的数据\*/public static byte\[\] decompress(InputStream is) \{

InflaterInputStream iis = newInflaterInputStream(is);

ByteArrayOutputStream o = newByteArrayOutputStream(1024);

try\{

inti = 1024;

byte\[\] buf = new byte\[i\];

while((i = iis.read(buf, 0, i)) > 0) \{

o.write(buf, 0, i);

\} catch(IOException e) \{

e.printStackTrace();

returno.toByteArray();

/\*\*\*以行为单位读取文件，常用于读面向行的格式化文件\*/public staticString readFileByLines(String fileName) \{

File file = newFile(fileName);

BufferedReader reader = null;

StringBuffer bf=newStringBuffer();

try\{

System.out.println("以行为单位读取文件内容，一次读一整行：");

reader = newBufferedReader(newFileReader(file));

String tempString = null;

// int line = 1;//一次读入一行，直到读入null为文件结束while((tempString = reader.readLine()) != null) \{

// //显示行号// System.out.println("line " + line + ": " + tempString);// line++;bf.append(tempString);

bf.append(System.getProperty("line.separator"));

reader.close();

\} catch(IOException e) \{

e.printStackTrace();

\} finally\{

if(reader != null) \{

try\{

reader.close();

\} catch(IOException e1) \{

returnbf.toString();

public static voidmain(String\[\] args) \{

System.out.println("字节压缩／解压缩测试");

// String inputStr = "95.24.118.233 - - \[15/Nov/2016:00:00:01 +0800\] \\"GET /min/?b=myres/js&f=jquery-1.9.1.min.js,jquery-migrate-1.2.1.min.js,jump.js,MSClass.js,projector.js HTTP/1.0\\" 200 44985 \\"http://forimi-beauty-machines-com.buy.weamax.com/products/page8.html\\" \\"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36\\" style.weamax.com - 0.005\\n";//输入字节长度:371//压缩后字节长度:293String inputStr= ZLibUtils.readFileByLines("C:\\\\Users\\\\Administrator\\\\Documents\\\\weamax\_access\_log.20161115");

//输入字节长度:39758338//压缩后字节长度:7081319System.out.println("输入字符串:"+ inputStr);

byte\[\] input = inputStr.getBytes();

System.out.println("输入字节长度:"+ input.length);

byte\[\] data = ZLibUtils.compress(input);

System.out.println("压缩后字节长度:"+ data.length);

byte\[\] output = ZLibUtils.decompress(data);

System.out.println("解压缩后字节长度:"+ output.length);

// String outputStr = new String(output);// System.out.println("输出字符串:" + outputStr);\}