[英]Socket connection refused in Client Code
下面的程序导致此问题
编辑:
import java.io.*;
import java.net.*;
public class smtpClient {
public static void main(String[] args) {
// declaration section:
// smtpClient: our client socket
// os: output stream
// is: input stream
Socket smtpSocket = null;
DataOutputStream os = null;
DataInputStream is = null;
// Initialization section:
// Try to open a socket on port 25 : step 1
// Try to open input and output streams: step 2
try {
smtpSocket = new Socket("192.168.1.2", 1024);
os = new DataOutputStream(smtpSocket.getOutputStream());
is = new DataInputStream(smtpSocket.getInputStream());
} catch (UnknownHostException e) {
System.err.println("Don't know about host: hostname");
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: hostname");
}
// If everything has been initialized then we want to write some data
// to the socket we have opened a connection to on port 25
if (smtpSocket != null && os != null && is != null) {
try {
// The capital string before each colon has a special meaning to SMTP
// you may want to read the SMTP specification, RFC1822/3
os.writeBytes("HELO\n");
os.writeBytes("MAIL From: k3is@fundy.csd.unbsj.ca\n");
os.writeBytes("RCPT To: k3is@fundy.csd.unbsj.ca\n");
os.writeBytes("DATA\n");
os.writeBytes("From: k3is@fundy.csd.unbsj.ca\n");
os.writeBytes("Subject: testing\n");
os.writeBytes("Hi there\n"); // message body
os.writeBytes("\n.\n");
os.writeBytes("QUIT");
// keep on reading from/to the socket till we receive the "Ok" from SMTP,
// once we received that then we want to break.
String responseLine;
while ((responseLine = is.readLine()) != null) {
System.out.println("Server: " + responseLine);
if (responseLine.indexOf("Ok") != -1) {
break;
}
}
// clean up:
// close the output stream
// close the input stream
// close the socket
os.close();
is.close();
smtpSocket.close();
} catch (UnknownHostException e) {
System.err.println("Trying to connect to unknown host: " + e);
} catch (IOException e) {
System.err.println("IOException: " + e);
}
}
}
}
控制台日志:
Couldn't get I/O for the connection to: hostname
我采用的程序来自: http : //www.javaworld.com/jw-12-1996/jw-12-sockets.html?page=4
我已经尝试将端口从25修改为1024
我正在本地PC上运行它,所以我是该系统的管理员,但不确定是否存在任何默认防火墙问题(在Windows 7的Eclipse中运行)
根据您在下面的评论:我需要做一个列表器,这意味着要说一个服务器套接字,它将监听smtp客户端请求
答案是:根据您提供的详细信息,没有正在运行的侦听器或具有指定IP和端口号的计算机。
UPD:那么您尝试连接到某个地方时,必须确保在另一侧监听某些内容,或者编写您自己的服务器代码,或者使用第三方服务器/代码在您的端口号上提供某些服务试图达到。
您为什么期望机器上运行的邮件服务器提供您提供的地址?
听起来其他程序正在使用端口1024。
尝试其他端口。
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