Java如何压缩zip格式文件

在这篇文章中，我们将学习如何以zip格式压缩文件和目录。 ZipOutputStream类用于将zip格式的数据写入输出流。 zip文件包含多个由ZipEntry类表示的条目。包java.util.zip提供了用于读取和编写zip和gzip文件格式的类。

压缩文件

以下是压缩文件的示例。文件：ZipFileExample.java -

package com.codeinn.tutorial.io;

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;

/**
 * @author codeinn
 */
public class ZipFileExample {
  public static void main(String[] args) {
    // Output zip file
    File zipfile = new File("MyFile.zip");
    // Input file to be compressed
    File inFile = new File("file.txt");

    FileInputStream fileInputStream = null;
    FileOutputStream fileOutputStream = null;
    ZipOutputStream zipOutputStream = null;
    try {
      fileInputStream = new FileInputStream(inFile);
      fileOutputStream = new FileOutputStream(zipfile);
      zipOutputStream = new ZipOutputStream(fileOutputStream);

      // Create ZipEntry
      ZipEntry entry = new ZipEntry(inFile.getName());

      // Set position of stream to the start of entry data
      zipOutputStream.putNextEntry(entry);

      // Write data to zipOutputStream
      byte[] data = new byte[1024];
      int i;
      while ((i = fileInputStream.read(data)) != -1) {
        zipOutputStream.write(data 0 i);
      }

      // Closes the current ZIP entry and positions the stream for writing
      // the next entry
      zipOutputStream.closeEntry();

    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (fileInputStream != null) {
          fileInputStream.close();
        }
        if (zipOutputStream != null) {
          zipOutputStream.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
}

压缩目录中的所有文件和子目录

此示例以递归方式遍历目录中的所有文件，并使用ZipOutputStream将其写入zip文件。

文件：ZipDirectoryExample.java -

package com.codeinn.tutorial.io;

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;

/**
 * @author codeinn
 */
public class ZipDirectoryExample {
  public static void main(String[] args) {
    File zipFile = new File("MyZip.zip");
    File directory = new File("D:/Work/java");
    FileOutputStream fileOutputStream = null;
    ZipOutputStream zipOutputStream = null;
    try {
      fileOutputStream = new FileOutputStream(zipFile);
      zipOutputStream = new ZipOutputStream(fileOutputStream);

      // Create zip file
      createZipFile(zipOutputStream directory directory.getAbsolutePath());

    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (zipOutputStream != null) {
          zipOutputStream.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }

  }

  /**
   * @param zipOutputStream
   * @param directory
   * @throws IOException
   */
  private static void createZipFile(ZipOutputStream zipOutputStream File directory String zipEntryPath) throws IOException {
    File[] files = directory.listFiles();
    for (File file : files) {
      if (file.isDirectory()) {
        createZipFile(zipOutputStream file zipEntryPath);
      } else {

        FileInputStream fileInputStream = new FileInputStream(file);

        // Create zipEntry
        String filePath = file.getAbsolutePath();
        ZipEntry entry = new ZipEntry(filePath.replace(zipEntryPath + File.separator ""));

        // Set position of stream to the start of entry data
        zipOutputStream.putNextEntry(entry);

        // Write data to zip output stream
        byte data[] = new byte[1024];
        int i;
        while ((i = fileInputStream.read(data)) != -1) {
          zipOutputStream.write(data 0 i);
        }

        // Closes the current ZIP entry
        zipOutputStream.closeEntry();

        // Close file stream
        fileInputStream.close();
      }
    }
  }
}