Java 读写GZIP格式文件代码，java读写gzip格式,使用GZIP格式压缩文本

Java 读写GZIP格式文件代码，java读写gzip格式,使用GZIP格式压缩文本

使用GZIP格式压缩文本以缩减文件大小，于是乎接触到了GZIPInputStream/GZIPOutputStream这两个类，还有ByteArrayOutputStream这个类。这里写了一个简单的示例代码记录一下```javaimport java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GZipFileTest {

private static final int BUFFER_SIZE = 1024;  /**  * @param args  */  public static void main(String[] args) {    File inputFile = new File("D:/test/input.txt");    File outputFile = new File("D:/test/test.dat");    writeGZip(inputFile,outputFile);    readGZip(outputFile);  }public static void readGZip(File file) {    GZIPInputStream gzipInputStream = null;      ByteArrayOutputStream baos = null;      try {          gzipInputStream = new GZIPInputStream(new FileInputStream(file));        baos = new ByteArrayOutputStream();        byte[] buf = new byte[BUFFER_SIZE];          int len = 0;          while((len=gzipInputStream.read(buf, 0, BUFFER_SIZE))!=-1){              baos.write(buf, 0, len);          }        baos.toByteArray();        String result = baos.toString("UTF-8");        System.out.println("result="+result);    } catch (FileNotFoundException e) {          e.printStackTrace();      } catch (IOException e) {          e.printStackTrace();      }finally{          if(gzipInputStream!=null){              try {                  gzipInputStream.close();              } catch (IOException e) {                  e.printStackTrace();              }          }          if(baos!=null){              try {                  baos.close();              } catch (IOException e) {                  e.printStackTrace();              }          }      }  }public static void writeGZip(File inputFile, File outputFile) {    GZIPOutputStream gzipOutputStream = null;      InputStream in = null;      try {          gzipOutputStream = new GZIPOutputStream(new FileOutputStream(outputFile));        in = new FileInputStream(inputFile);        byte[] buffer = new byte[BUFFER_SIZE];        int len = 0;          while ((len = in.read(buffer,0,BUFFER_SIZE)) > 0) {              gzipOutputStream.write(buffer, 0, len);          }          gzipOutputStream.finish();    } catch (FileNotFoundException e) {          e.printStackTrace();      } catch (IOException e) {          e.printStackTrace();      }finally{          if(gzipOutputStream!=null){              try {                  gzipOutputStream.close();              } catch (IOException e) {                  e.printStackTrace();              }          }          if(in!=null){              try {                  in.close();              } catch (IOException e) {                  e.printStackTrace();              }          }      }  }

}
```