java 文件压缩和解压

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 App {	

    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();
           
    		//remember close it
    		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     */
     * 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(); 
    } 
}