Java压缩和解压缩zip文件

介绍

Java提供的java.util.zip包只支持zip和gzip。至于更多格式的压缩可以选择apache的Commons Compress。

参考：https://o7planning.org/en/10195/java-compression-and-decompression-tutorial

读取zip文件列表

package com.dylan.javacore.compress;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 * @Description: 列出压缩包中的文件结构
 * @Author laoxu
 * @Date 2019/8/5 10:01
 **/
public class ListZipEntriesDemo {
    public static void main(String[] args) {
        String FILE_PATH="D:/test/data.zip";

        ZipInputStream zipls = null;

        try {
            zipls = new ZipInputStream(new FileInputStream(FILE_PATH), Charset.forName("GBK"));
            ZipEntry entry = null;
            while ((entry=zipls.getNextEntry())!=null){
                if(entry.isDirectory()){
                    System.out.print("Directory:");
                }else{
                    System.out.print("File:");
                }
                System.out.println(entry.getName());
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(zipls!=null){
                try {
                    zipls.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}

输出：

解压zip到指定目录

package com.dylan.javacore.compress;

import java.io.*;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 * @Description: 解压zip
 * @Author laoxu
 * @Date 2019/8/5 13:50
 **/
public class UnZipDemo {
    public static void main(String[] args) {
        final String OUTPUT_FOLDER="d:/test/output";
        String FILE_PATH="d:/test/data.zip";

        // 判断文件夹是否存在
        File folder = new File(OUTPUT_FOLDER);
        if(!folder.exists()){
            folder.mkdir();
        }

        // 创建buffer
        byte[] buffer = new byte[1024];
        ZipInputStream zipls = null;

        try {
            zipls = new ZipInputStream(new FileInputStream(FILE_PATH), Charset.forName("GBK"));
            ZipEntry entry = null;
            while ((entry=zipls.getNextEntry())!=null){
                String entryName = entry.getName();
                String outFileName = OUTPUT_FOLDER + File.separator + entryName;
                System.out.println("Unzip: " + outFileName);

                if(entry.isDirectory()){
                    new File(outFileName).mkdirs();
                }else{
                    FileOutputStream fos = new FileOutputStream(outFileName);
                    int len;
                    while ((len = zipls.read(buffer))>0){
                        fos.write(buffer,0,len);
                    }
                    fos.close();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                zipls.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}

压缩文件夹

package com.dylan.javacore.compress;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * @Description: 压缩文件夹
 * @Author laoxu
 * @Date 2019/8/5 15:25
 **/
public class ZipDirectory {

    public ZipDirectory() {

    }

    // A method to Compress a directory.
    public void zipDirectory(File inputDir, File outputZipFile) {
        // Create parent directory for the output file.
        outputZipFile.getParentFile().mkdirs();

        String inputDirPath = inputDir.getAbsolutePath();
        byte[] buffer = new byte[1024];

        FileOutputStream fileOs = null;
        ZipOutputStream zipOs = null;
        try {

            List<File> allFiles = this.listChildFiles(inputDir);

            // Create ZipOutputStream object to write to the zip file
            fileOs = new FileOutputStream(outputZipFile);
            //
            zipOs = new ZipOutputStream(fileOs, Charset.forName("GBK"));
            for (File file : allFiles) {
                String filePath = file.getAbsolutePath();

                System.out.println("Zipping " + filePath);
                // entryName: là một đường dẫn tương đối.
                String entryName = filePath.substring(inputDirPath.length() + 1);

                ZipEntry ze = new ZipEntry(entryName);
                // Put new entry into zip file.
                zipOs.putNextEntry(ze);
                // Read the file and write to ZipOutputStream.
                FileInputStream fileIs = new FileInputStream(filePath);

                int len;
                while ((len = fileIs.read(buffer)) > 0) {
                    zipOs.write(buffer, 0, len);
                }
                fileIs.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            closeQuite(zipOs);
            closeQuite(fileOs);
        }

    }

    private void closeQuite(OutputStream out) {
        try {
            out.close();
        } catch (Exception e) {
        }
    }

    // This method returns the list of files,
    // including the children, grandchildren files of the input folder.
    private List<File> listChildFiles(File dir) throws IOException {
        List<File> allFiles = new ArrayList<File>();

        File[] childFiles = dir.listFiles();
        for (File file : childFiles) {
            if (file.isFile()) {
                allFiles.add(file);
            } else {
                List<File> files = this.listChildFiles(file);
                allFiles.addAll(files);
            }
        }
        return allFiles;
    }

    public static void main(String[] args) {
        ZipDirectory zipDir = new ZipDirectory();

        File inputDir = new File("D:/test/output");
        File outputZipFile = new File("D:/test/output/datas.zip");

        zipDir.zipDirectory(inputDir, outputZipFile);

    }
}

下一篇讲Common Compress