更新时间:2023-11-26 11:51:04
显然这个文件根本没有创建。您可以使用
创建新文件(yourFilepath).createNewFile()
/ pre>,您需要在之前
FileOutputStream fos = new FileOutputStream(filepath + filename);
其中引发异常。然后它工作得很好。
I made a small program to download a zip file from a direct link and after that extract all contents of it in the same directory. It doesn't download anything and it also doesn't extract. This is what I have so far:
package main; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.net.URL; import java.nio.channels.Channels; import java.nio.channels.ReadableByteChannel; import java.util.zip.ZipEntry; import java.util.zip.ZipInputStream; public class Main { static String url = "https://www.dropbox.com/s/uml938guklfvo7r/Tekst.zip?dl=1"; static int lastSlashIndex = url.lastIndexOf('/'); static String filename= url.substring(lastSlashIndex + 1, url.length() - 5); static String filepath = "C:"; private static final int BUFFER = 4096; public static void main(String[] args) { try{ URL website = new URL(url); ReadableByteChannel rbc; rbc = Channels.newChannel(website.openStream()); new File(filepath + filename).createNewFile(); FileOutputStream fos = new FileOutputStream(filepath + filename); fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE); fos.close(); }catch(Exception e){ e.printStackTrace(); } try { unzip(filepath + filename, filepath); } catch (IOException e) { e.printStackTrace(); } } public static void unzip(String zipFilePath, String destDirectory) throws IOException { File destDir = new File(destDirectory); if (!destDir.exists()) { destDir.mkdir(); } ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFilePath)); ZipEntry entry = zipIn.getNextEntry(); // iterates over entries in the zip file while (entry != null) { String filePath = destDirectory + File.separator + entry.getName(); if (!entry.isDirectory()) { // if the entry is a file, extracts it extractFile(zipIn, filePath); } else { // if the entry is a directory, make the directory File dir = new File(filePath); dir.mkdir(); } zipIn.closeEntry(); entry = zipIn.getNextEntry(); } zipIn.close(); } private static void extractFile(ZipInputStream zipIn, String filePath) throws IOException { Line 68>> BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath)); byte[] bytesIn = new byte[BUFFER]; int read = 0; while ((read = zipIn.read(bytesIn)) != -1) { bos.write(bytesIn, 0, read); } bos.close(); } }
Here is the error:
java.io.FileNotFoundException: C:\Tekst.txt (Access is denied) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.<init>(Unknown Source) at java.io.FileOutputStream.<init>(Unknown Source) at main.Main.extractFile(Main.java:68) at main.Main.unzip(Main.java:55) at main.Main.main(Main.java:35)
Apparently this file is simply not created yet. You can create it with
new File(yourFilepath).createNewFile()
and you need to do it before you invoke
FileOutputStream fos = new FileOutputStream(filepath + filename);
which throws the exception. Then it works perfectly fine.