java.net.SocketException：权限被拒绝：recv 失败

Question

我是这个网络 java 概念中的初级程序员，您可以在其中连接到远程 ftp 服务器并执行琐碎的任务。

这是我的代码

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;


public class SimpleOne {

    static String serverName = "ftp.drivehq.com";
    static int port = 21;
    static String username = "CANTSHOW";
    static String password = "CANTSHOW";
    public static void main(String[] args) throws IOException{
        FTPClient ftpc = new FTPClient();
        ftpc.connect(serverName, port);
        int reply = ftpc.getReplyCode();
        String sReply = ftpc.getReplyString();
        if(!FTPReply.isPositiveCompletion(reply))
        {
            System.out.println("Some error!");
            return;
        }
        boolean success = ftpc.login(username, password);
        if(success)
        {
            System.out.println("Login successful!");
            System.out.println(sReply);
            ftpc.enterLocalPassiveMode();
            String dir=ftpc.printWorkingDirectory();
            System.out.println(dir);
            success = ftpc.changeWorkingDirectory("My Documents");
            if(success)
            {
                System.out.println(ftpc.printWorkingDirectory());
                ftpc.setFileType(FTP.BINARY_FILE_TYPE);
                String remoteFile = "SampleText.txt";
                File localFile = new File("sample.txt");
                OutputStream localOutputStream = new BufferedOutputStream(new FileOutputStream(localFile));
                success=ftpc.retrieveFile(remoteFile, localOutputStream);//<--- ERROR LINE
                localOutputStream.close();
                if(!success)
                {
                    System.out.println("There was some problem in retrieving the file");
                    return;
                }
                System.out.println("File was downloaded!");
            }
            else
            {
                System.out.println("Could not change directory!");
            }
        }
        else
        {
            System.out.println("Login failed!");
        }
    }

}

这是我的输出结果：

Login successful!
220 Welcome to the most popular FTP hosting service! Save on hardware, software, hosting and admin. Share files/folders with read-write permission. Visit http://www.drivehq.com/ftp/;

/
/My Documents
Exception in thread "main" java.net.SocketException: Permission denied: recv failed
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.read(SocketInputStream.java:152)
    at java.net.SocketInputStream.read(SocketInputStream.java:122)
    at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
    at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
    at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
    at java.io.InputStreamReader.read(InputStreamReader.java:184)
    at java.io.BufferedReader.fill(BufferedReader.java:154)
    at java.io.BufferedReader.read(BufferedReader.java:175)
    at org.apache.commons.net.io.CRLFLineReader.readLine(CRLFLineReader.java:58)
    at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:314)
    at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:294)
    at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:483)
    at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:608)
    at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:582)
    at org.apache.commons.net.ftp.FTP.pasv(FTP.java:1007)
    at org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:869)
    at org.apache.commons.net.ftp.FTPClient._retrieveFile(FTPClient.java:1854)
    at org.apache.commons.net.ftp.FTPClient.retrieveFile(FTPClient.java:1845)
    at SimpleOne.main(SimpleOne.java:44)

我都试过了：

我用谷歌搜索了这个问题，发现它被列为官方错误并且微软发布了一个修补程序。我下载了那个修补程序，但安装程序说它不适用于我的 windows 版本（顺便说一句，我使用 win7 x86 和 jdk 1.7.0_67）
我更新了我的 windows，并下载了所有更新
我允许 java.exe 和 javaw.exe 在我的防火墙中的入站和出站连接类型

请帮帮我，我完全卡在这里了。

注意：由于我还在学习，我还没有编写您注销和断开连接的那部分代码。我希望它与此错误无关。

Answer 1

原来不仅要下载安装更新，还要重启电脑！

好吧，所以我不得不重新启动它！

问题已解决。

谢谢！

java.net.SocketException：权限被拒绝：recv 失败

java.net.SocketException: Permission denied: recv failed

java

ftp

networking