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java 如何解压文件

2026-02-05 08:00:01Java

解压文件的方法

在Java中解压文件通常使用java.util.zip包或第三方库如Apache Commons Compress。以下是几种常见的方法：

使用java.util.zip解压ZIP文件

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 void unzip(String zipFilePath, String destDirectory) throws IOException {
        File destDir = new File(destDirectory);
        if (!destDir.exists()) {
            destDir.mkdir();
        }
        try (ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFilePath))) {
            ZipEntry entry = zipIn.getNextEntry();
            while (entry != null) {
                String filePath = destDirectory + File.separator + entry.getName();
                if (!entry.isDirectory()) {
                    extractFile(zipIn, filePath);
                } else {
                    File dir = new File(filePath);
                    dir.mkdir();
                }
                zipIn.closeEntry();
                entry = zipIn.getNextEntry();
            }
        }
    }

    private static void extractFile(ZipInputStream zipIn, String filePath) throws IOException {
        try (FileOutputStream fos = new FileOutputStream(filePath)) {
            byte[] buffer = new byte[1024];
            int len;
            while ((len = zipIn.read(buffer)) > 0) {
                fos.write(buffer, 0, len);
            }
        }
    }
}

使用Apache Commons Compress解压多种格式文件

添加Maven依赖：

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-compress</artifactId>
    <version>1.21</version>
</dependency>

解压示例代码：

import org.apache.commons.compress.archivers.ArchiveException;
import org.apache.commons.compress.archivers.ArchiveInputStream;
import org.apache.commons.compress.archivers.ArchiveStreamFactory;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.utils.IOUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class UnzipWithCommons {
    public static void unzip(String zipFilePath, String destDirectory) throws IOException, ArchiveException {
        File destDir = new File(destDirectory);
        if (!destDir.exists()) {
            destDir.mkdir();
        }
        try (ArchiveInputStream ais = new ArchiveStreamFactory()
                .createArchiveInputStream(ArchiveStreamFactory.ZIP, new FileInputStream(zipFilePath))) {
            ZipArchiveEntry entry;
            while ((entry = (ZipArchiveEntry) ais.getNextEntry()) != null) {
                File outputFile = new File(destDir, entry.getName());
                if (entry.isDirectory()) {
                    outputFile.mkdirs();
                } else {
                    try (FileOutputStream fos = new FileOutputStream(outputFile)) {
                        IOUtils.copy(ais, fos);
                    }
                }
            }
        }
    }
}