我正在開發一個應用程序，該應用程序會將第三方依賴項下載到特定文件夾，然后對其執行依賴項檢查。下載的文件可以是任何類型，可以是 zip、jar 或可能是 ba 文件夾。我試圖找到一個代碼示例，但似乎沒有什么對我有用。我在java中嘗試過NIO，但這似乎只適用于寫入特定文件而不是文件夾。下面是我使用 NIO 的代碼 // Checking If The File Exists At The Specified Location Or Not Path filePathObj = Paths.get(filePath); boolean fileExists = Files.exists(filePathObj); if(fileExists) { try { urlObj = new URL(sampleUrl); rbcObj = Channels.newChannel(urlObj.openStream()); fOutStream = new FileOutputStream(filePath); fOutStream.getChannel().transferFrom(rbcObj, 0, Long.MAX_VALUE); System.out.println("! File Successfully Downloaded From The Url !"); } catch (IOException ioExObj) { System.out.println("Problem Occured While Downloading The File= " + ioExObj.getMessage()); } finally { try { if(fOutStream != null){ fOutStream.close(); } if(rbcObj != null) { rbcObj.close(); } } catch (IOException ioExObj) { System.out.println("Problem Occured While Closing The Object= " + ioExObj.getMessage()); } } } else { System.out.println("File Not Present! Please Check!"); }```
2 回答
慕容森
TA貢獻1853條經驗 獲得超18個贊
使用 OKHttpClient 下載文件并將其放置在文件夾中。
Request request = new Request.Builder().url(downloadUrl).build();
Response response;
try {
response = client.newCall(request).execute();
if (response.isSuccessful()) {
fileName = abc.zip
Path targetPath = new File(inDir + File.separator + fileName).toPath();
try (FileOutputStream fos = new FileOutputStream(targetPath)) {
fos.write(response.body().bytes());
}
return 0;
}
} catch (IOException e) {
logger.error(e.getMessage());
}```
SMILET
TA貢獻1796條經驗 獲得超4個贊
public Class CopyAndWrite {
public static final String SOURCES = "C:\\Users\\Administrator\\Desktop\\resources";
public static final String TARGET = "C:\\Users\\Administrator\\Desktop\\111";
public static void main (String[]args) throws IOException {
Path startingDir = Paths.get(SOURCES);
Files.walkFileTree(startingDir, new FindJavaVisitor());
}
private static class FindJavaVisitor extends SimpleFileVisitor<Path> {
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
if (!StringUtils.equals(dir.toString(), SOURCES)) {
Path targetPath = Paths.get(TARGET + dir.toString().substring(SOURCES.length()));
if (!Files.exists(targetPath)) {
Files.createDirectory(targetPath);
}
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Path targetPath = Paths.get(TARGET + file.toString().substring(SOURCES.length()));
copyFile(targetPath, Files.readAllBytes(file));
return FileVisitResult.CONTINUE;
}
}
private static void copyFile (Path path,byte[] bytes){
// write file
try {
Files.write(path, bytes);
} catch (IOException e) {
e.printStackTrace();
}
}
}
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