java压缩与解压缩

package com.example.demo.utils;

import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

/**
 * @author :sohikoryuu
 * @date :Created in 2020/7/8 10:22
 * @description:文件压缩与解压缩
 * @version: 1.0
 */
public class FileZipUtils {

    /**
     * zip文件压缩
     *
     * @param inputFile  待压缩文件夹/文件名
     * @param outputFile 生成的压缩包名字
     */

    public static void ZipCompress(String inputFile, String outputFile) throws Exception {
        //创建zip输出流
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(outputFile));
        //创建缓冲输出流
        BufferedOutputStream bos = new BufferedOutputStream(out);
        File input = new File(inputFile);
        compress(out, bos, input, null);
        bos.close();
        out.close();
    }

    /**
     * @param name 压缩文件名,可以写为null保持默认
     */
    //递归压缩
    public static void compress(ZipOutputStream out, BufferedOutputStream bos, File input, String name) throws IOException {
        if (name == null) {
            name = input.getName();
        }
        //如果路径为目录(文件夹)
        if (input.isDirectory()) {
            //取出文件夹中的文件(或子文件夹)
            File[] flist = input.listFiles();

            if (flist.length == 0) {//如果文件夹为空,则只需在目的地zip文件中写入一个目录进入
                out.putNextEntry(new ZipEntry(name + "/"));
            } else {//如果文件夹不为空,则递归调用compress,文件夹中的每一个文件(或文件夹)进行压缩
                for (int i = 0; i < flist.length; i++) {
                    compress(out, bos, flist[i], name + "/" + flist[i].getName());
                }
            }
        } else {//如果不是目录(文件夹),即为文件,则先写入目录进入点,之后将文件写入zip文件中
            out.putNextEntry(new ZipEntry(name));
            FileInputStream fos = new FileInputStream(input);
            BufferedInputStream bis = new BufferedInputStream(fos);
            int len = -1;
            //将源文件写入到zip文件中
            byte[] buf = new byte[1024];
            while ((len = bis.read(buf)) != -1) {
                bos.write(buf, 0, len);
            }
            bis.close();
            fos.close();
        }
    }

    /**
     * zip解压
     *
     * @param inputFile   待解压文件名
     * @param destDirPath 解压路径
     */

    public static void ZipUncompress(String inputFile, String destDirPath) throws Exception {
        File srcFile = new File(inputFile);//获取当前压缩文件
        // 判断源文件是否存在
        if (!srcFile.exists()) {
            throw new Exception(srcFile.getPath() + "所指文件不存在");
        }
        //开始解压
        //构建解压输入流
        ZipInputStream zIn = new ZipInputStream(new FileInputStream(srcFile));
        ZipEntry entry = null;
        File file = null;
        while ((entry = zIn.getNextEntry()) != null) {
            if (!entry.isDirectory()) {
                file = new File(destDirPath, entry.getName());
                if (!file.exists()) {
                    new File(file.getParent()).mkdirs();//创建此文件的上级目录
                }
                OutputStream out = new FileOutputStream(file);
                BufferedOutputStream bos = new BufferedOutputStream(out);
                int len = -1;
                byte[] buf = new byte[1024];
                while ((len = zIn.read(buf)) != -1) {
                    bos.write(buf, 0, len);
                }
                // 关流顺序,先打开的后关闭
                bos.close();
                out.close();
            }
        }
    }


    public static void main(String[] args) {
        try {
            // 文件夹压缩与解压缩
            long start = System.currentTimeMillis();
            ZipCompress("D:\\sohikoryuu\\material\\log.txt", "D:\\sohikoryuu\\test\\zip\\material.zip");
            ZipUncompress("D:\\sohikoryuu\\test\\zip\\material.zip", "D:\\sohikoryuu\\test\\zip\\解压文件");
            System.out.println((System.currentTimeMillis() - start));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

 

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