java实现文件夹的解压和压缩

效果

• 实现多个文件以及文件夹的压缩和解压

代码分析

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
public class Main {
    public static void main(String[] args) throws IOException {
    	//解决中文乱码
    	//压缩	参数改成你自己的源文件路径和压缩后的文件路径
		//yasuo("C:\\file\\", "C:\\file.zip");
		//解压	参数改成你自己的源文件路径和解压后的文件路径
		jieya("C:\\file.zip", "C:\\file\\");
    }

	public static void jieya(String zipPath, String path) throws IOException, FileNotFoundException {
		//创建解压后的文件夹
		File pt=new File(path.substring(0,path.length()-1));
		if(!pt.exists()) {
			pt.mkdirs();
		}
		//try(resource)来保证InputStream正确关闭
		try(ZipInputStream zip=new ZipInputStream(new FileInputStream(zipPath))){
			//ZipEntry表示一个压缩文件或目录
			ZipEntry entry;
			while((entry=zip.getNextEntry())!=null) {
				String name=entry.getName();
				//压缩文件
				if(!(entry.getName().contains(File.separator))) {
					FileOutputStream file= new FileOutputStream( path+ name);
					int n=0;
					while((n=zip.read())!=-1) {
						file.write(n);
					}
				}else {
				//目录
					int index=name.lastIndexOf("\\");
					File file= new File(path+ name.substring(0,index));
					if(!file.exists()) {
						file.mkdirs();
					}
					//如果不是空目录
					if(index!=name.length()-1) {
						FileOutputStream f= new FileOutputStream( path+ name);
						int n=0;
						while((n=zip.read())!=-1) {
							f.write(n);
						}
					}
				}
			}
			zip.closeEntry();
		}
	}

	public static void yasuo(String path, String zipPath) throws IOException, FileNotFoundException {
		File zp=new File(zipPath);
		if(!zp.exists()) {
			zp.createNewFile();
		}
		
		try(ZipOutputStream zip=new ZipOutputStream(new FileOutputStream(zp))) {
    		File files= new File(path);
    		File[] f=files.listFiles();
    		for (File file : f) {
    			zipAll(zip, file,file.getName());
			}
			
    	}
	}

	public static void zipAll(ZipOutputStream zip, File files,String name) throws IOException, FileNotFoundException {
		if(files.isDirectory()) {
			File[] files2=files.listFiles();
			if(files2.length==0||files2==null) {
				zip.putNextEntry(new ZipEntry(name+File.separator));
			}else{
				for (File file2 : files2) {
					if(file2.isFile()) {
						zip.putNextEntry(new ZipEntry(name+File.separator+file2.getName()));
						int n;
						FileInputStream input=new FileInputStream(file2);
						while((n=input.read())!=-1) {
							zip.write(n);
						}
					}
					else {
						zipAll(zip,file2,name+File.separator+file2.getName());
					}
				}
			}
		}else {
			zip.putNextEntry(new ZipEntry(name));
			int n;
			FileInputStream input=new FileInputStream(files);
			while ((n=input.read())!=-1) {
				zip.write(n);
			}
		}
	}
}

小结

• 压缩
  ZipOutputStream可以把多份数据写入zip包；

• 解压
  ZipInputStream可以读取zip格式的流；