Java 如何实现解压缩文件和文件夹

  
  public static void zipMultipleFiles(String zipFileName, File... files) throws ioException {
    ZipOutputStream zipOutputStream = null;
    try {
      // 输出流
      zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFileName));
      // 遍历每一个文件，进行输出
      for (File file : files) {
        zipOutputStream.putNextEntry(new ZipEntry(file.getName()));
        FileInputStream fileInputStream = new FileInputStream(file);
        int readLen;
        byte[] buffer = new byte[1024];
        while ((readLen = fileInputStream.read(buffer)) != -1) {
          zipOutputStream.write(buffer, 0, readLen);
        }
        // 关闭流
        fileInputStream.close();
        zipOutputStream.closeEntry();
      }
    } finally {
      if (null != zipOutputStream) {
        try {
          zipOutputStream.close();
        } catch (IOException ex) {
          ex.printStackTrace();
        }
      }
    }
  }

  public static void main(String[] args) throws Exception {
    zipMultipleFiles("D:/my.zip", new File("D:/infp.txt"), new File("D:/infp1.txt"));
  }

package com.nobody.zip;

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

public class ZipUtils {

  
  public static void zipFileTree(File sourceFile, String fORMat) throws IOException {
    ZipOutputStream zipOutputStream = null;
    try {
      String zipFileName;
      if (sourceFile.isDirectory()) { // 目录
        zipFileName = sourceFile.getParent() + File.separator + sourceFile.getName() + "."
            + format;
      } else { // 单个文件
        zipFileName = sourceFile.getParent()
            + sourceFile.getName().substring(0, sourceFile.getName().lastIndexOf("."))
            + "." + format;
      }
      // 压缩输出流
      zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFileName));
      zip(sourceFile, zipOutputStream, "");
    } finally {
      if (null != zipOutputStream) {
        // 关闭流
        try {
          zipOutputStream.close();
        } catch (IOException ex) {
          ex.printStackTrace();
        }
      }
    }
  }

  
  private static void zip(File file, ZipOutputStream zipOutputStream, String relativePath)
      throws IOException {

    FileInputStream fileInputStream = null;
    try {
      if (file.isDirectory()) { // 当前为文件夹
        // 当前文件夹下的所有文件
        File[] list = file.listFiles();
        if (null != list) {
          // 计算当前的相对路径
          relativePath += (relativePath.length() == 0 ? "" : "/") + file.getName();
          // 递归压缩每个文件
          for (File f : list) {
            zip(f, zipOutputStream, relativePath);
          }
        }
      } else { // 压缩文件
        // 计算文件的相对路径
        relativePath += (relativePath.length() == 0 ? "" : "/") + file.getName();
        // 写入单个文件
        zipOutputStream.putNextEntry(new ZipEntry(relativePath));
        fileInputStream = new FileInputStream(file);
        int readLen;
        byte[] buffer = new byte[1024];
        while ((readLen = fileInputStream.read(buffer)) != -1) {
          zipOutputStream.write(buffer, 0, readLen);
        }
        zipOutputStream.closeEntry();
      }
    } finally {
      // 关闭流
      if (fileInputStream != null) {
        try {
          fileInputStream.close();
        } catch (IOException ex) {
          ex.printStackTrace();
        }
      }
    }
  }

  public static void main(String[] args) throws Exception {
    String path = "D:/test";
    String format = "zip";
    zipFileTree(new File(path), format);
  }
}

package com.nobody.zip;

import java.io.FileOutputStream;
import java.io.IOException;
import java.NIO.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;


public class ZipFileTree extends SimpleFileVisitor<Path> {

  // zip输出流
  private ZipOutputStream zipOutputStream;
  // 源目录
  private Path sourcePath;

  public ZipFileTree() {}

  
  public void zipFile(String sourceDir) throws IOException {
    try {
      // 压缩后的文件和源目录在同一目录下
      String zipFileName = sourceDir + ".zip";
      this.zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFileName));
      this.sourcePath = Paths.get(sourceDir);

      // 开始遍历文件树
      Files.walkFileTree(sourcePath, this);
    } finally {
      // 关闭流
      if (null != zipOutputStream) {
        zipOutputStream.close();
      }
    }
  }

  // 遍历到的每一个文件都会执行此方法
  @Override
  public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) throws IOException {
    // 取相对路径
    Path targetFile = sourcePath.relativize(file);
    // 写入单个文件
    zipOutputStream.putNextEntry(new ZipEntry(targetFile.toString()));
    byte[] bytes = Files.readAllBytes(file);
    zipOutputStream.write(bytes, 0, bytes.length);
    zipOutputStream.closeEntry();
    // 继续遍历
    return FileVisitResult.CONTINUE;
  }

  // 遍历每一个目录时都会调用的方法
  @Override
  public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs)
      throws IOException {
    return super.preVisitDirectory(dir, attrs);
  }

  // 遍历完一个目录下的所有文件后，再调用这个目录的方法
  @Override
  public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
    return super.postVisitDirectory(dir, exc);
  }

  // 遍历文件失败后调用的方法
  @Override
  public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
    return super.visitFileFailed(file, exc);
  }

  public static void main(String[] args) throws IOException {
    // 需要压缩源目录
    String sourceDir = "D:/test";
    // 压缩
    new ZipFileTree().zipFile(sourceDir);
  }
}

package com.nobody.zip;

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


public class ZipUtils {

  
  public static void unzip(String zipFilePath, String desDirectory) throws Exception {

    File desDir = new File(desDirectory);
    if (!desDir.exists()) {
      boolean mkdirSuccess = desDir.mkdir();
      if (!mkdirSuccess) {
        throw new Exception("创建解压目标文件夹失败");
      }
    }
    // 读入流
    ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(zipFilePath));
    // 遍历每一个文件
    ZipEntry zipEntry = zipInputStream.getNextEntry();
    while (zipEntry != null) {
      if (zipEntry.isDirectory()) { // 文件夹
        String unzipFilePath = desDirectory + File.separator + zipEntry.getName();
        // 直接创建
        mkdir(new File(unzipFilePath));
      } else { // 文件
        String unzipFilePath = desDirectory + File.separator + zipEntry.getName();
        File file = new File(unzipFilePath);
        // 创建父目录
        mkdir(file.getParentFile());
        // 写出文件流
        BufferedOutputStream bufferedOutputStream =
            new BufferedOutputStream(new FileOutputStream(unzipFilePath));
        byte[] bytes = new byte[1024];
        int readLen;
        while ((readLen = zipInputStream.read(bytes)) != -1) {
          bufferedOutputStream.write(bytes, 0, readLen);
        }
        bufferedOutputStream.close();
      }
      zipInputStream.closeEntry();
      zipEntry = zipInputStream.getNextEntry();
    }
    zipInputStream.close();
  }

  // 如果父目录不存在则创建
  private static void mkdir(File file) {
    if (null == file || file.exists()) {
      return;
    }
    mkdir(file.getParentFile());
    file.mkdir();
  }

  public static void main(String[] args) throws Exception {
    String zipFilePath = "D:/test.zip";
    String desDirectory = "D:/a";
    unzip(zipFilePath, desDirectory);
  }
}