GZIP .gz 文件解压与压缩工具类代码,Java代码库,德仔网

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【Java】 GZIP .gz 文件解压与压缩工具类
作者:东京 / 发布于2016/12/6/ 449
package com.ucf.gatewaycheck.utils;  
  
import java.util.zip.GZIPInputStream;   
import java.io.FileOutputStream;   
import java.io.FileInputStream;   
import java.io.FileNotFoundException;   
import java.io.IOException;   
  
import org.apache.log4j.Logger;  
  
public class GZIPFileUtil {   
    private static final Logger log=Logger.getLogger(GZIPFileUtil.class);  
    /**   
     * Uncompress the incoming file.   
     * @param inFileName Name of the file to be uncompressed   
     */   
    public  static String doUncompressFile(String inFileName) {   
        log.info("建行快捷对账文件解压文件名：["+inFileName+"]");  
        GZIPInputStream in = null;   
        FileOutputStream out = null;   
        try {   
            if (!getExtension(inFileName).equalsIgnoreCase("gz")) {   
                log.error("File name must have extension of \".gz\"");   
                System.exit(1);   
            }   
            try {   
                in = new GZIPInputStream(new FileInputStream(inFileName));   
            } catch(FileNotFoundException e) {   
                log.error("File not found. " + inFileName);   
                System.exit(1);   
            }   
            String outFileName = getFileName(inFileName);   
            try {   
                out = new FileOutputStream(outFileName);   
            } catch (FileNotFoundException e) {   
                log.error("Could not write to file. " + outFileName);   
                System.exit(1);   
            }   
            byte[] buf = new byte[1024];   
            int len;   
            while((len = in.read(buf)) > 0) {   
                out.write(buf, 0, len);   
            }   
            log.info("建行快捷对账文件解压保存路径：["+outFileName+"]");  
            return outFileName;  
        } catch (IOException e) {   
            log.error("File write Fail!");  
            System.exit(1);   
        }finally{  
            try {  
                if (in != null) {  
                    in.close();  
                }  
                if (out != null) {  
                    out.close();  
                }  
            } catch (IOException e) {  
                log.error(e);  
            }  
        }  
        return null;  
    }   
  
    /**   
     * Used to extract and return the extension of a given file.   
     * @param f Incoming file to get the extension of   
     * @return String representing the extension of the incoming   
     *  file.   
     */   
    public static String getExtension(String f) {   
        String ext = "";   
        int i = f.lastIndexOf('.');   
        if (i > 0 &&  i < f.length() - 1) {   
            ext = f.substring(i+1);   
        }        
        return ext;   
    }   
  
    /**   
     * Used to extract the filename without its extension.   
     * @param f Incoming file to get the filename   
     * @return String representing the filename without its   
     *         extension.   
     */   
    public static String getFileName(String f) {   
        String fname = "";   
        int i = f.lastIndexOf('.');   
        if (i > 0 &&  i < f.length() - 1) {   
            fname = f.substring(0,i);   
        }        
        return fname;   
    }   
  
    /**   
     * Sole entry point to the class and application.   
     * @param args Array of String arguments.   
     */   
    public static void main(String[] args) {   
    String mess=doUncompressFile("E:/CCBKJ/SHOP.105290073991463.20150329.KJZF.txt.gz");   
      System.out.println(mess);  
    }   
  
}   

文件压缩：

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package com.ucf.gatewaycheck.service.impl;  
  
import java.io.FileInputStream;   
import java.io.FileNotFoundException;   
import java.io.FileOutputStream;   
import java.io.IOException;   
import java.util.zip.GZIPOutputStream;   
  
  
public class CompressFileGZIP {   
    private static void doCompressFile(String inFileName) {   
        try {   
            System.out.println("Creating the GZIP output stream.");   
            String outFileName = inFileName + ".gz";   
            GZIPOutputStream out = null;   
            try {   
                out = new GZIPOutputStream(new FileOutputStream(outFileName));   
            } catch(FileNotFoundException e) {   
                System.err.println("Could not create file: " + outFileName);   
                System.exit(1);   
            }   
            System.out.println("Opening the input file.");   
            FileInputStream in = null;   
            try {   
                in = new FileInputStream(inFileName);   
            } catch (FileNotFoundException e) {   
                System.err.println("File not found. " + inFileName);   
                System.exit(1);   
            }   
  
            System.out.println("Transfering bytes from input file to GZIP Format.");   
            byte[] buf = new byte[1024];   
            int len;   
            while((len = in.read(buf)) > 0) {   
                out.write(buf, 0, len);   
            }   
            in.close();   
  
            System.out.println("Completing the GZIP file");   
            out.finish();   
            out.close();   
  
        } catch (IOException e) {   
            e.printStackTrace();   
            System.exit(1);   
        }   
  
    }   
  
    /**   
     * Sole entry point to the class and application.   
     * @param args Array of String arguments.   
     */   
    public static void main(String[] args) {   
        String str="E:\\AUTORUN.INF";   
  
        doCompressFile(str);   
  
  
  
    }   
}
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