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Java - 解壓縮 (unzip)，並寫一個單元測試進行測試
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| import lombok.extern.slf4j.Slf4j; | |
| import java.io.File; | |
| import java.io.FileInputStream; | |
| import java.io.FileOutputStream; | |
| import java.io.IOException; | |
| import java.nio.charset.Charset; | |
| import java.nio.charset.StandardCharsets; | |
| import java.nio.file.Path; | |
| import java.util.zip.ZipEntry; | |
| import java.util.zip.ZipInputStream; | |
| @Slf4j | |
| public final class ZipUtils { | |
| private ZipUtils() {} | |
| public static void unzip(Path inputZipFile, Path outputDirectory) throws IOException { | |
| File destDir = new File(outputDirectory.toString()); | |
| try { | |
| // 先試試 utf8 | |
| unzip(inputZipFile, destDir, StandardCharsets.UTF_8); | |
| } catch (RuntimeException e) { | |
| log.error("UTF_8解壓縮失敗"); | |
| // 再試試看 big5 | |
| unzip(inputZipFile, destDir, Charset.forName("Big5")); | |
| } | |
| } | |
| private static void unzip(Path inputZipFile, File destDir, Charset charset) throws IOException { | |
| log.info("開始使用 Charset: {} 進行解壓縮", charset); | |
| byte[] buffer = new byte[1024]; | |
| try (ZipInputStream zis = new ZipInputStream(new FileInputStream(inputZipFile.toFile()), charset)) { | |
| 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 { | |
| File parent = newFile.getParentFile(); | |
| if (!parent.isDirectory() && !parent.mkdirs()) { | |
| throw new IOException("Failed to create directory " + parent); | |
| } | |
| writeFileContent(zis, newFile, buffer); | |
| } | |
| zipEntry = zis.getNextEntry(); | |
| } | |
| } | |
| } | |
| private 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; | |
| } | |
| private static void writeFileContent(ZipInputStream zis, File newFile, byte[] buffer) throws IOException { | |
| // write file content | |
| try (FileOutputStream fos = new FileOutputStream(newFile)) { | |
| int len; | |
| while ((len = zis.read(buffer)) > 0) { | |
| fos.write(buffer, 0, len); | |
| } | |
| } | |
| } | |
| } |
接著我們寫一個單元測試來測試一下功能是否正確
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