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java 文件压缩和解压

admin 11月 12, 2020 0

引言

文件压缩和解压是常见的操作
本文重点总结了java中文件压缩和解压的方法

方法一

zip格式，不支持中文
压缩：

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class  
{ 
    public static void main( String[] args )
    {
       byte[] buffer = new byte[1024];
     
     try{
            
         FileOutputStream fos = new FileOutputStream("C:\MyFile.zip");
           ZipOutputStream zos = new ZipOutputStream(fos);
         ZipEntry ze= new ZipEntry("spy.log");
           zos.putNextEntry(ze);
            FileInputStream in = new FileInputStream("C:\spy.log");
       
          int len;
         while ((len = in.read(buffer)) > 0) {
               zos.write(buffer, 0, len);
           }

           in.close();
         zos.closeEntry();
           
          
         zos.close();
          
            System.out.println("Done");

     }catch(IOException ex){
        ex.printStackTrace();
     }
    }
}

解压

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class UnZip
{
    List<String> fileList;
    private static final String INPUT_ZIP_FILE = "C:\MyFile.zip";
    private static final String OUTPUT_FOLDER = "C:\outputzip";
     
    public static void main( String[] args )
    {
       UnZip unZip = new UnZip();
      unZip.unZipIt(INPUT_ZIP_FILE,OUTPUT_FOLDER);
    }
    
    /**
     * Unzip it
     * @param zipFile input zip file
     * @param output zip file output folder
     */
    public void unZipIt(String zipFile, String outputFolder){

     byte[] buffer = new byte[1024];
     
     try{
            
     //create output directory is not exists
     File folder = new File(OUTPUT_FOLDER);
        if(!folder.exists()){
           folder.mkdir();
      }
            
     //get the zip file content
      ZipInputStream zis = 
            new ZipInputStream(new FileInputStream(zipFile));
      //get the zipped file list entry
        ZipEntry ze = zis.getNextEntry();
            
     while(ze!=null){
               
        String fileName = ze.getName();
           File newFile = new File(outputFolder + File.separator + fileName);
                
           System.out.println("file unzip : "+ newFile.getAbsoluteFile());
                
            //create all non exists folders
            //else you will hit FileNotFoundException for compressed folder
            new File(newFile.getParent()).mkdirs();
              
            FileOutputStream fos = new FileOutputStream(newFile);             

            int len;
            while ((len = zis.read(buffer)) > 0) {
               fos.write(buffer, 0, len);
            }
              
            fos.close();   
            ze = zis.getNextEntry();
        }
        
        zis.closeEntry();
     zis.close();
         
     System.out.println("Done");
         
    }catch(IOException ex){
       ex.printStackTrace(); 
    }
   }    
}

方法二

GBK编码，支持中文，zip格式
压缩

import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.nio.charset.Charset; 
import java.util.zip.ZipEntry; 
import java.util.zip.ZipOutputStream; 

public class zip { 

    public static void main(String args[]) throws IOException {
      File inFile = new File("D:\test.txt"); 
      ZipOutputStream zos = new ZipOutputStream(new FileOutputStream("D:\test.zip"), Charset.forName("GBK"));
      
      zos.setComment("ziped by Ming Cheng."); 
      zipFile(inFile, zos, ""); 
      zos.close(); 
    } 

    public static void zipFile(File inFile, ZipOutputStream zos, String dir) throws IOException { 
        if (inFile.isDirectory()) { 
            File[] files = inFile.listFiles(); 
            for (File file:files) 
                zipFile(file, zos, dir + "\" + inFile.getName()); 
        } else { 
            String entryName = null; 
            if (!"".equals(dir)) 
                entryName = dir + "\" + inFile.getName(); 
            else 
                entryName = inFile.getName(); 
                
            ZipEntry entry = new ZipEntry(entryName); 
            zos.putNextEntry(entry); 
            
            InputStream is = new FileInputStream(inFile); 
            int len = 0; 
            while ((len = is.read()) != -1) 
                zos.write(len); 
                
            is.close(); 
        } 
    } 
}

解压

import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.nio.charset.Charset; 
import java.util.zip.ZipEntry; 
import java.util.zip.ZipFile; 
import java.util.zip.ZipInputStream; 

public class Unzip { 

    public static void main(String args[]) throws IOException { 
        File file = new File("D:\test.zip");
        ZipFile zipFile = new ZipFile(file, Charset.forName("GBK"));

        ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(file), Charset.forName("GBK")); 
        unpack(zipFile, zipInputStream); 
    } 

    public static void unpack(ZipFile zipFile, ZipInputStream zipInputStream) throws IOException { 

        ZipEntry zipEntry = null; 
        while ((zipEntry = zipInputStream.getNextEntry()) != null) { 
            String fileName = zipEntry.getName(); 
            File temp = new File("D:\Test\" + fileName); 

            if (! temp.getParentFile().exists()) 
                temp.getParentFile().mkdirs(); 

            OutputStream os = new FileOutputStream(temp); 
            InputStream is = zipFile.getInputStream(zipEntry); 

            int len = 0; 
            System.out.println(zipEntry.getName()); 

            while ((len = is.read()) != -1) 
                os.write(len); 

            os.close(); 
            is.close(); 
        } 
        zipInputStream.close(); 
    } 
}