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java如何解压文件

2026-02-05 09:08:41Java

使用 java.util.zip 包解压文件

Java 提供了 java.util.zip 包来处理 ZIP 格式的压缩文件。以下是一个简单的解压示例：

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

public class UnzipExample {
    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 (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath))) {
            byte[] bytesIn = new byte[4096];
            int read;
            while ((read = zipIn.read(bytesIn)) != -1) {
                bos.write(bytesIn, 0, read);
            }
        }
    }
}

使用 Apache Commons Compress 库

对于更复杂的压缩格式（如 RAR、7z 等），可以使用 Apache Commons Compress 库：

import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveInputStream;
import org.apache.commons.compress.utils.IOUtils;

public class CommonsUnzip {
    public static void unzip(String zipFile, String outputFolder) throws IOException {
        try (ZipArchiveInputStream zis = new ZipArchiveInputStream(new FileInputStream(zipFile))) {
            ZipArchiveEntry entry;
            while ((entry = zis.getNextZipEntry()) != null) {
                File outputFile = new File(outputFolder, entry.getName());
                if (entry.isDirectory()) {
                    outputFile.mkdirs();
                } else {
                    outputFile.getParentFile().mkdirs();
                    try (OutputStream os = new FileOutputStream(outputFile)) {
                        IOUtils.copy(zis, os);
                    }
                }
            }
        }
    }
}

处理 GZIP 压缩文件

对于单个文件的 GZIP 解压缩：

import java.io.*;
import java.util.zip.GZIPInputStream;

public class GzipExample {
    public static void ungzip(String gzipFile, String outputFile) throws IOException {
        try (GZIPInputStream gis = new GZIPInputStream(new FileInputStream(gzipFile));
             FileOutputStream fos = new FileOutputStream(outputFile)) {
            byte[] buffer = new byte[1024];
            int len;
            while ((len = gis.read(buffer)) > 0) {
                fos.write(buffer, 0, len);
            }
        }
    }
}