zip压缩与解压

最新推荐文章于 2022-01-01 22:27:09 发布

原创最新推荐文章于 2022-01-01 22:27:09 发布 · 291 阅读

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本文详细介绍了使用Java进行文件压缩和解压缩的方法，包括如何利用ZipOutputStream和ZipFile类来实现文件的压缩和解压缩操作。文章通过具体代码示例展示了如何处理文件和目录的压缩，以及如何读取和写入ZipEntry。

package fyhh.stream.io;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ZipUtil {
	
	//存放已压缩的文件目录
	private Map<String,ZipEntry> map = new HashMap<String,ZipEntry>();
	
	public static void main(String[] args) throws IOException {
		ZipUtil zu = new ZipUtil();
//		zu.unwrap(new File("h"), new File("tt.zip"));
		zu.wrap(new File("tt.zip"), new File("tt"));
	}
	
	/**
	 * 解压缩文件
	 * @param source		待解压文件
	 * @param destination	目标文件
	 * @return
	 * @throws IOException  if an I/O error has occurred
	 * @throws ZipException if a ZIP format error has occurred
	 */
	public boolean wrap(File source,File destination) throws ZipException, IOException {
		if(!source.exists()) {
			throw new FileNotFoundException("源文件不存在");
		}
		if(destination.exists()) {
			if(!destination.isDirectory()) {
				destination.mkdirs();
			}
		}else {
			destination.mkdirs();
		}
		ZipFile zipfile = new ZipFile(source);
		Enumeration<?> entries = zipfile.entries();
		while(entries.hasMoreElements()) {
			ZipEntry entry = (ZipEntry) entries.nextElement();
			File file = new File(destination.getPath()+File.separator+entry.getName());
			System.out.println(entry.getName());
			if(entry.isDirectory()) {
				file.mkdirs();
				continue;
			}
			InputStream is = zipfile.getInputStream(entry);
			BufferedInputStream bis = new BufferedInputStream(is);
			BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destination.getPath()+File.separator+entry.getName()));
			byte[] bytes = new byte[1024];
			int len = 0;
			while((len=bis.read(bytes))!=-1) {
				bos.write(bytes,0,len);
			}
			bis.close();
			bos.close();
		}
		zipfile.close();
		return false;
	}
	
	/**
	 * 压缩文件
	 * @param source	待压缩文件夹
	 * @param destination	压缩文件
	 * @return
	 * @throws IOException 
	 */
	public boolean unwrap(File source,File destination) throws IOException {
		//1.创建压缩文件
		if(!source.exists()) {
			throw new ZipException("待压缩文件不存在");
		}
		destination.delete();
		if(!destination.exists()) {
			destination.createNewFile();
		}
		//2.压缩文件
		ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(destination));
		if(source.isDirectory()) {
			addDirectory(source,zos,true);
		}else {
			addFile(source,zos);
		}
		zos.close();
		return true;
	}
	
	
	
	/**
	 * 压缩文件添加目录
	 * 
	 * @param file
	 * @param zos
	 * @throws IOException 
	 */
	private void addDirectory(File file, ZipOutputStream zos, boolean bool) throws IOException {
		String[] paths = file.getPath().split("\\/");
		StringBuilder builder = new StringBuilder();
		for(String path : paths) {
			if(path.trim().isEmpty()) {
				continue;
			}
			builder.append(path);
			String tpath = builder.toString();
			ZipEntry entry = new ZipEntry(tpath+"/");
			if(map.get(entry.getName()) == null) {
				map.put(entry.getName(), entry);
				zos.putNextEntry(entry);
				zos.closeEntry();
			}
			builder.append("/");
		}
		if(bool) {
			File[] files = file.listFiles();
			for(File f : files) {
				if(f.isDirectory()) {
					addDirectory(f, zos, true);
				}else {
					addFile(f, zos);
				}
			}
		}
		
	}
	
	/**
	 * 压缩文件添加文件
	 * 
	 * @param file
	 * @param zos
	 * @throws IOException 
	 */
	private void addFile(File file, ZipOutputStream zos) throws IOException {
		File parent = file.getParentFile();
		if(parent!=null) {
			if(map.get(new ZipEntry(parent.getPath()+"/").getName())!=null) {
				ZipEntry entry = new ZipEntry(file.getPath());
				if(map.get(entry.getName())==null) {
					zos.putNextEntry(entry);
					copyFile(file,zos);
					zos.closeEntry();
					map.put(entry.getName(), entry);
				}
			}else {
				addDirectory(parent, zos, false);
			}
		}
	}
	
	/**
	 * 复制文件
	 * 
	 * @param src
	 * @param dest
	 * @return
	 * @throws IOException 
	 */
	public void copyFile(File src,ZipOutputStream zos) throws IOException {
		//参数校验
		if(!src.exists()) {
			throw new FileNotFoundException("待复制文件未找到");
		}
		
		//完成复制
		BufferedInputStream bis = null;
		try {
			bis = new BufferedInputStream(new FileInputStream(src));
			byte[] bytes = new byte[1024];
			int len = 0;
			while((len=bis.read(bytes))!=-1) {
				zos.write(bytes, 0, len);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} finally {
			if(bis != null) {
				bis.close();
			}
		}
	}
	
}

上面的代码有部分没考虑到，导致代码较复杂，修改后的代码如下：

package fyhh.stream.io;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ZipUtil {
	
	public static void main(String[] args) throws IOException {
		ZipUtil zu = new ZipUtil();
		zu.unwrap(new File("h"), new File("tt.zip"));
//		zu.wrap(new File("tt.zip"), new File("tt"));
	}
	
	/**
	 * 解压缩文件
	 * @param source		待解压文件
	 * @param destination	目标文件
	 * @return
	 * @throws IOException  if an I/O error has occurred
	 * @throws ZipException if a ZIP format error has occurred
	 */
	public boolean wrap(File source,File destination) throws ZipException, IOException {
		if(!source.exists()) {
			throw new FileNotFoundException("源文件不存在");
		}
		if(destination.exists()) {
			if(!destination.isDirectory()) {
				destination.mkdirs();
			}
		}else {
			destination.mkdirs();
		}
		ZipFile zipfile = new ZipFile(source);
		Enumeration<?> entries = zipfile.entries();
		while(entries.hasMoreElements()) {
			ZipEntry entry = (ZipEntry) entries.nextElement();
			File file = new File(destination.getPath()+File.separator+entry.getName());
			System.out.println(entry.getName());
			if(entry.isDirectory()) {
				file.mkdirs();
				continue;
			}
			InputStream is = zipfile.getInputStream(entry);
			BufferedInputStream bis = new BufferedInputStream(is);
			BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destination.getPath()+File.separator+entry.getName()));
			byte[] bytes = new byte[1024];
			int len = 0;
			while((len=bis.read(bytes))!=-1) {
				bos.write(bytes,0,len);
			}
			bis.close();
			bos.close();
		}
		zipfile.close();
		return false;
	}
	
	/**
	 * 压缩文件
	 * @param source	待压缩文件夹
	 * @param destination	压缩文件
	 * @return
	 * @throws IOException 
	 */
	public boolean unwrap(File source,File destination) throws IOException {
		//1.创建压缩文件
		if(!source.exists()) {
			throw new ZipException("待压缩文件不存在");
		}
		destination.delete();
		if(!destination.exists()) {
			destination.createNewFile();
		}
		//2.压缩文件
		ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(destination));
		if(source.isDirectory()) {
			addDirectory(source,zos);
		}else {
			addFile(source,zos);
		}
		zos.close();
		return true;
	}
	
	
	
	/**
	 * 压缩文件添加目录
	 * 
	 * @param file
	 * @param zos
	 * @throws IOException 
	 */
	private void addDirectory(File file, ZipOutputStream zos) throws IOException {
		ZipEntry entry = new ZipEntry(file.getPath()+"/");
		zos.putNextEntry(entry);
		zos.closeEntry();
		
		File[] files = file.listFiles();
		for(File f : files) {
			if(f.isDirectory()) {
				addDirectory(f, zos);
			}else {
				addFile(f, zos);
			}
		}
	}
	
	/**
	 * 压缩文件添加文件
	 * 
	 * @param file
	 * @param zos
	 * @throws IOException 
	 */
	private void addFile(File file, ZipOutputStream zos) throws IOException {
		ZipEntry entry = new ZipEntry(file.getPath());
		zos.putNextEntry(entry);
		copyFile(file,zos);
		zos.closeEntry();
	}
	
	/**
	 * 复制文件
	 * 
	 * @param src
	 * @param dest
	 * @return
	 * @throws IOException 
	 */
	public void copyFile(File src,ZipOutputStream zos) throws IOException {
		//参数校验
		if(!src.exists()) {
			throw new FileNotFoundException("待复制文件未找到");
		}
		
		//完成复制
		BufferedInputStream bis = null;
		try {
			bis = new BufferedInputStream(new FileInputStream(src));
			byte[] bytes = new byte[1024];
			int len = 0;
			while((len=bis.read(bytes))!=-1) {
				zos.write(bytes, 0, len);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} finally {
			if(bis != null) {
				bis.close();
			}
		}
	}
	
}

可以这样改的原因就是lFile#istFiles方法，逐层遍历。