从java中的url下载文件不完整-使用java NIO

我使用以下线程的可接受解决方案中提供的代码下载了一个500kb的zip文件

代码能够识别文件，但问题是，下载不完整。它总是下载5KB，然后停在那里

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我不想一直使用apache commons文件。

问题是我没有设置身份验证。我设置了身份验证，它成功了。代码如下

public static File  downloadFile(String fileURL, String saveDir)
    throws IOException {

File downloadFolder = null;
String saveFilePath = null;

String username = "guest";
String password = "guest";

String usepass = username + ":" + password;
String basicAuth = "Basic "+  javax.xml.bind.DatatypeConverter.printBase64Binary(usepass.getBytes());

URL url = new URL(fileURL);
HttpURLConnection httpConn = (HttpURLConnection) website.openConnection();
httpConn.setRequestProperty("Authorization", basicAuth);

ReadableByteChannel rbc = Channels.newChannel(httpConn.getInputStream());
String    fileName = fileURL.substring(fileURL.lastIndexOf("/") + 1,fileURL.length()); 
FileOutputStream fos = new FileOutputStream(fileName);

saveFilePath = saveDir + File.separator + fileName;
downloadFolder = new File(saveDir);

downloadFolder.deleteOnExit();
downloadFolder.mkdirs();

FileOutputStream outputStream = new FileOutputStream(saveFilePath);
outputStream.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);

outputStream.close();
rbc.close();
return new File(saveFilePath);

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}

您能获得下载文件的大小吗？您的意思是在下载之前读取文件大小吗？很抱歉，您无法读取ReadableByteChannel的大小。使用read方法直到返回值为-1，然后将缓冲区写入文件。实际上，我使用了传统的读取缓冲区的方法，直到-1，同样的原因也失败了。只有5kb的下载。我尝试使用ApacheCommons io只是为了进行实验，即使是5k下载也会停止。我认为是其他原因导致了这个问题。当使用浏览器下载时，超过5KB？

public static File  downloadFile(String fileURL, String saveDir)
    throws IOException {

File downloadFolder = null;
String saveFilePath = null;

String username = "guest";
String password = "guest";

String usepass = username + ":" + password;
String basicAuth = "Basic "+  javax.xml.bind.DatatypeConverter.printBase64Binary(usepass.getBytes());

URL url = new URL(fileURL);
HttpURLConnection httpConn = (HttpURLConnection) website.openConnection();
httpConn.setRequestProperty("Authorization", basicAuth);

ReadableByteChannel rbc = Channels.newChannel(httpConn.getInputStream());
String    fileName = fileURL.substring(fileURL.lastIndexOf("/") + 1,fileURL.length()); 
FileOutputStream fos = new FileOutputStream(fileName);

saveFilePath = saveDir + File.separator + fileName;
downloadFolder = new File(saveDir);

downloadFolder.deleteOnExit();
downloadFolder.mkdirs();

FileOutputStream outputStream = new FileOutputStream(saveFilePath);
outputStream.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);

outputStream.close();
rbc.close();
return new File(saveFilePath);