Java文件压缩解压

1、用java.util.zip下的工具压缩

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

public class UtilZip {

	public static void main(String[] args) throws Exception{
		
		String srcFileName="D:/mail.eml";
		String zipFileName="D:/mail.zip";
		
		try {
			zipFile(srcFileName,zipFileName);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public static void zipFile(String srcFileName,String zipFileName) throws Exception{
		
		FileInputStream fis=null;
		ZipOutputStream zos=null;
		
		File srcFile=new File(srcFileName);
		
		fis=new FileInputStream(srcFile);
		
		zos=new ZipOutputStream(new FileOutputStream(new File(zipFileName)));
		zos.putNextEntry(new ZipEntry(srcFile.getName()));
		
		byte[] buffer=new byte[4028];
		int readed=0;
		while((readed=fis.read(buffer))!=-1){
			zos.write(buffer,0, readed);
		}
		//这里一定要关闭流，否则压缩文件会损坏
		zos.closeEntry();
		zos.close();
		fis.close();
	}
	
}

2、用ant.jar包里面的工具压缩

import java.io.*;   

import org.apache.tools.zip.ZipOutputStream;   

public class AntZip {   
	   
    public static void main(String arg[]) {  
    	
        String srcFilePath = new String("D:/邮件");   
        String outFilename = new String("D:/mail.rar");   
        
        AntZip.zipFileByAnt(srcFilePath, outFilename);   
        
    } 
    
    public static void zipFileByAnt(String srcFilePath,String zipFileName) {   
    	
        try {   
            File srcPath = new File(srcFilePath);   
            int fileCount = srcPath.listFiles().length;   
            String[] filenames = new String[fileCount];   
            byte[] buffer = new byte[1024];   
            File[] files = srcPath.listFiles();   
            for (int i = 0; i < fileCount; i++) {   
                filenames[i] = srcPath.getPath() + File.separator + files[i].getName();   
            } 
            
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName));   
            out.setEncoding("UTF-8");
            
            FileInputStream fis=null;
            for (int i = 0; i < filenames.length; i++) {   
                fis = new FileInputStream(filenames[i]);   
                out.putNextEntry(new org.apache.tools.zip.ZipEntry(files[i].getName()));   
                int readed;   
                while ((readed = fis.read(buffer)) > 0) {   
                    out.write(buffer, 0, readed);   
                }     
            }  
            out.closeEntry();
            out.close();
            fis.close();
        } catch (Exception e) {   
            e.printStackTrace();   
        }   
    }   
      
}  

 

3、压缩文件

package jp.com.syspro.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;

public class ZipFile {

	public static void main(String[] args) {
		zip("D:/Temp/DWR与界面开发", "D:/Temp/DWR与界面开发.zip");
	}

	public static void zip(String srcFile){
		zip(srcFile,"");
	}
	
	public static void zip(String srcFile, String zipFile) {
		File src = new File(srcFile);
		if (src.exists()) {
			// 压缩文件不存在时，压缩到当前目录
			if ("".equals(zipFile) || zipFile == null) {
				if (src.isDirectory()) {
					zipFile = srcFile + ".zip";
				} else {
					zipFile = srcFile.split("\\.")[0] + ".zip";
				}
			} else {
				if (!zipFile.contains(srcFile)) {
					File zip = new File(zipFile);
					if (!zip.getParentFile().exists()) {
						zip.getParentFile().mkdirs();
					}
				} else {
					// 压缩文件在被压缩的文件夹里面时，压缩到当前目录
					zipFile = srcFile + ".zip";
				}
			}
			zip(src, zipFile);
		}
	}

	public static void zip(File file, String zipFile) {
		try {
			FileOutputStream fos = new FileOutputStream(zipFile);
			ZipOutputStream zos = new ZipOutputStream(fos);
			zip(zos, file, "");
			zos.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static void zip(ZipOutputStream zos, File file, String base) {
		zos.setEncoding("UTF-8");
		if (file.isDirectory()) {
			File[] files = file.listFiles();
			try {
				zos.putNextEntry(new ZipEntry(base + "/"));
				base = base.length() == 0 ? "" : base + "/";
				for (int i = 0; i < files.length; i++) {
					zip(zos, files[i], base + files[i].getName());
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		} else {
			try {
				zos.putNextEntry(new ZipEntry(base));
				FileInputStream fis = new FileInputStream(file);
				int readed = 0;
				while ((readed = fis.read()) != -1) {
					zos.write(readed);
				}
				zos.flush();
				fis.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

}