Java 客户端代码中的套接字连接被拒绝
以下程序导致此问题 编辑:Java 客户端代码中的套接字连接被拒绝,java,sockets,Java,Sockets,以下程序导致此问题 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 = nu
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
我参加的课程来自:
我已尝试将端口从25修改为1024我在本地PC上运行它,因此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上的eclipse中运行)
根据您下面的评论:我是否需要制作一个listner,也就是说一个服务器套接字,它将侦听smtp客户端请求听起来好像其他程序正在使用端口1024
请尝试其他端口。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:然后您尝试连接到某个地方,您必须确保另一端有侦听器,可以编写您自己的服务器代码,也可以使用第三方服务器/代码在您尝试访问的端口号上提供特定服务
为什么您希望在您提供的地址的机器上运行邮件服务器?有什么东西在该ip地址的端口1024上侦听吗?只是想知道-有什么东西在该端口上侦听并且指定了ip?1024是保留端口…它实际上不是reserver,这种情况下,较低的1024个端口只允许root@Zavior不,仅保留最多(包括)端口1023。