Question

我正尝试使用Apache Commons Net FTPSClient将Java应用程序中的.zip文件上传到FTP服务器。

<pre><code>import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPSClient;

public class FTPUploader {
    /**
     * Zips the source file first and then uploads it to the ftp server
     * @param source - The file to be uploaded
     * @param target - The file on the ftp server to upload to
     */
    public static void upload(String source, String target){
        BufferedInputStream stream = null;
        File zippedFile = new File("/temp/"+UUID.randomUUID()+".zip");
        File targetFile = new File(target);
        FTPSClient client = new FTPSClient();
        System.out.println("[FTPClient] Starting Upload of "+source+" to "+target);
        try {
            //Establish connection to FTP Server
            client.connect("localhost");
            client.login("user", "password"); //changed
            client.setFileType(FTP.BINARY_FILE_TYPE);
            client.enterLocalPassiveMode();
            client.execPBSZ(0);
            client.execPROT("P");
            //Get the original File
            File file = new File(source);
            //Zip the file before uploading
            if(file.isDirectory()){
                ZipUtil.zipDirectory(source, zippedFile.getPath());
            }
            else{
                ZipUtil.zipFile(source, zippedFile.getPath());
            }
            //Go to the directory on the ftp server
            String directoryPath = targetFile.getParentFile().getPath();
            //If it doesn't exist create it
            if(!client.changeWorkingDirectory(directoryPath)){
                client.makeDirectory(directoryPath);
                client.changeWorkingDirectory(directoryPath);
            }
            //Create an InputStream of the zipped file to be uploaded
            stream = new BufferedInputStream(new FileInputStream(zippedFile));
            //Store zipped file to server
            if(client.storeFile(targetFile.getName(), stream)){
                System.out.println("[FTPClient] Done!");
            }
            else{
                System.out.println("[FTPClient] Upload failed: "+client.getReplyString());
            }
            //Finish up
            client.logout();
        } catch (IOException e) {
            System.out.println("[FTPClient] Error! Last Reply: "+client.getReplyString());
            e.printStackTrace();
        } finally {
            try {
                if (stream != null) {
                    stream.close();
                }
                client.disconnect();
                zippedFile.delete();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

org.apache.commons.net.io.CopyStreamException: IOException caught while copying.
    at org.apache.commons.net.io.Util.copyStream(Util.java:136)
    at org.apache.commons.net.ftp.FTPClient._storeFile(FTPClient.java:675)
    at org.apache.commons.net.ftp.FTPClient.__storeFile(FTPClient.java:639)
    at org.apache.commons.net.ftp.FTPClient.storeFile(FTPClient.java:2030)
    ... 2 more
 Caused by: java.net.SocketException: Broken pipe (Write failed)
    at java.net.SocketOutputStream.socketWrite0(Native Method)
    at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:155)
    at sun.security.ssl.OutputRecord.writeBuffer(OutputRecord.java:431)
    at sun.security.ssl.OutputRecord.write(OutputRecord.java:417)
    at sun.security.ssl.SSLSocketImpl.writeRecordInternal(SSLSocketImpl.java:886)
    at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:857)
    at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:123)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
    at java.io.BufferedOutputStream.write(BufferedOutputStream.java:126)
    at org.apache.commons.net.io.Util.copyStream(Util.java:124)
    ... 5 more</code></pre>

我检查过的事情：

与FTP服务器的连接正常
登录成功
FTP服务器上的目录已成功创建
在FTP服务器上创建了具有正确名称的空.zip文件
对远程目录的权限为755（可以写入）
本地和远程文件路径均正确且本地文件存在

有人知道如何解决该错误吗？

Answer 1

问题是由FTP服务器引起的。它具有一个强制FTP客户端从数据通道上的控制通道重用其SSL会话的设置，而Apache Commons FTP客户端显然不这样做。使用“ TLSOptions NoSessionReuseRequired”禁用服务器上的要求即可解决此问题。

值得注意的是，该要求似乎具有安全背景，因为当不需要使用相同的SSL会话时，数据通道可能会被劫持。查看此答案：https://stackoverflow.com/a/32404418/10173457

FTPClient如何解决org.apache.commons.net.io.CopyStreamException：复制时捕获IOException

1 个答案: