Java 76. Lập trình nén và giải nén file | Lập trình Java

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Video giải thích chi tiết

Tham khảo tại đây: https://www.baeldung.com/java-compress-and-uncompress

 Code chi tiết 

package main;

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

public class ZipFile {
    public static void main(String[] args) throws IOException {
        String sourceFile = "/Users/mac/eclipse-workspace/Java_76/test.txt";
        FileOutputStream fos = new FileOutputStream("/Users/mac/eclipse-workspace/Java_76/compressed.zip");
        ZipOutputStream zipOut = new ZipOutputStream(fos);
        
        File fileToZip = new File(sourceFile);
        FileInputStream fis = new FileInputStream(fileToZip);
        
        ZipEntry zipEntry = new ZipEntry(fileToZip.getName());
        zipOut.putNextEntry(zipEntry);
        byte[] bytes = new byte[1024];
        int length;
        while((length = fis.read(bytes)) >= 0) {
            zipOut.write(bytes, 0, length);
        }
        
        zipOut.close();
        fis.close();
        fos.close();
    }
}

package main;

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

public class ZipMultipleFiles {
	public static void main(String[] args) throws IOException {
        List<String> srcFiles = Arrays.asList("/Users/mac/eclipse-workspace/Java_76/test1.txt", "/Users/mac/eclipse-workspace/Java_76/test2.txt");
        FileOutputStream fos = new FileOutputStream("/Users/mac/eclipse-workspace/Java_76/multiCompressed.zip");
        ZipOutputStream zipOut = new ZipOutputStream(fos);
        for (String srcFile : srcFiles) {
            File fileToZip = new File(srcFile);
            FileInputStream fis = new FileInputStream(fileToZip);
            ZipEntry zipEntry = new ZipEntry(fileToZip.getName());
            zipOut.putNextEntry(zipEntry);

            byte[] bytes = new byte[1024];
            int length;
            while((length = fis.read(bytes)) >= 0) {
                zipOut.write(bytes, 0, length);
            }
            fis.close();
        }
        zipOut.close();
        fos.close();
    }
}

package main;

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

public class ZipDirectory {
	public static void main(String[] args) throws IOException {
        String sourceFile = "/Users/mac/eclipse-workspace/Java_76/zipTest";
        FileOutputStream fos = new FileOutputStream("/Users/mac/eclipse-workspace/Java_76/dirCompressed.zip");
        ZipOutputStream zipOut = new ZipOutputStream(fos);
        File fileToZip = new File(sourceFile);

        zipFile(fileToZip, fileToZip.getName(), zipOut);
        zipOut.close();
        fos.close();
    }

    private static void zipFile(File fileToZip, String fileName, ZipOutputStream zipOut) throws IOException {
        if (fileToZip.isHidden()) {
            return;
        }
        if (fileToZip.isDirectory()) {
            if (fileName.endsWith("/")) {
                zipOut.putNextEntry(new ZipEntry(fileName));
                zipOut.closeEntry();
            } else {
                zipOut.putNextEntry(new ZipEntry(fileName + "/"));
                zipOut.closeEntry();
            }
            File[] children = fileToZip.listFiles();
            for (File childFile : children) {
                zipFile(childFile, fileName + "/" + childFile.getName(), zipOut);
            }
            return;
        }
        FileInputStream fis = new FileInputStream(fileToZip);
        ZipEntry zipEntry = new ZipEntry(fileName);
        zipOut.putNextEntry(zipEntry);
        byte[] bytes = new byte[1024];
        int length;
        while ((length = fis.read(bytes)) >= 0) {
            zipOut.write(bytes, 0, length);
        }
        fis.close();
    }
}

package main;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class UnzipFile {
	public static File newFile(File destinationDir, ZipEntry zipEntry) throws IOException {
	    File destFile = new File(destinationDir, zipEntry.getName());

	    String destDirPath = destinationDir.getCanonicalPath();
	    String destFilePath = destFile.getCanonicalPath();

	    if (!destFilePath.startsWith(destDirPath + File.separator)) {
	        throw new IOException("Entry is outside of the target dir: " + zipEntry.getName());
	    }

	    return destFile;
	}
	
	public static void main(String[] args) throws IOException {
        String fileZip = "/Users/mac/eclipse-workspace/Java_76/dirCompressed.zip";
        File destDir = new File("/Users/mac/eclipse-workspace/Java_76/unzipTest");
        byte[] buffer = new byte[1024];
        ZipInputStream zis = new ZipInputStream(new FileInputStream(fileZip));
        ZipEntry zipEntry = zis.getNextEntry();
        while (zipEntry != null) {
            File newFile = newFile(destDir, zipEntry);
            if (zipEntry.isDirectory()) {
                if (!newFile.isDirectory() && !newFile.mkdirs()) {
                    throw new IOException("Failed to create directory " + newFile);
                }
            } else {
                // fix for Windows-created archives
                File parent = newFile.getParentFile();
                if (!parent.isDirectory() && !parent.mkdirs()) {
                    throw new IOException("Failed to create directory " + parent);
                }
                
                // write file content
                FileOutputStream fos = new FileOutputStream(newFile);
                int len;
                while ((len = zis.read(buffer)) > 0) {
                    fos.write(buffer, 0, len);
                }
                fos.close();
            }
        zipEntry = zis.getNextEntry();
       }
        zis.closeEntry();
        zis.close();
    }
}