这是课程。第一个类用于创建两个方法 sendMessage被禁止写入消息。 包poo_tema4;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.net.Socket;
import java.util.Date;
/**
*
* @author Stefan
*/
public class ClientPeer implements Serializable {
private Socket socket;
private String senderName;
// private static Socket socket = null;
// private static OutputStream outputStream = null;
// private static InputStream inputStream = null;
public ClientPeer(String senderName, Socket socket) {
this.socket = socket;
this.senderName = senderName;
}
public void sendMessage(String message) throws IOException,ClassNotFoundException,ObjectStreamException {
Message newMessage = new Message(message,"Hey how are you");
try {
ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
out.writeObject(newMessage);
out.flush();
out.close();
} catch (IOException e) {
System.out.println("Unable to write this message");
}
try {
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
Message msg;
msg = (Message)ois.readObject();
System.out.println(msg.getMessage());
ois.close();
} catch (ClassNotFoundException e) {
System.out.println("Unable to read this message" + e.getMessage());
}
catch(ObjectStreamException e)
{
System.out.println("Unable to read this message" + e.getMessage());
}
catch(IOException e)
{
System.out.println("Unable to read this message" + e.getMessage());
}
}
public void sendMessage(String message, String receiver) throws IOException,ClassNotFoundException,ObjectStreamException {
PrivateMessage newPrivateMessage = new PrivateMessage(message, "Fine!", receiver);
try {
ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
out.writeObject(newPrivateMessage);
out.flush();
out.close();
} catch (IOException e) {
System.out.println("Unable to write this private message");
}
try {
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
PrivateMessage prvMsg = (PrivateMessage) ois.readObject();
System.out.println(prvMsg.getPrivateMessage());
ois.close();
} catch (ClassNotFoundException e) {
System.out.println("Unable to read this private message" + e.getMessage());
}
catch(ObjectStreamException e)
{
System.out.println("Unable to read this private message" + e.getMessage());
}
catch(IOException e)
{
System.out.println("Unable to read this private message" + e.getMessage());
}
}
}
/*
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*/
package poo_tema4;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Scanner;
/**
*
* @author Stefan
*/
public class TextClient {
private static Socket socket = null;
private static OutputStream outputStream = null;
private static InputStream inputStream = null;
private static String sender = null;
public static void main(String args[]) {
try {
socket = new Socket("127.0.0.1",9000);
if(socket.isConnected()==true){
System.out.println("The socket is connected");
}
outputStream = socket.getOutputStream();
inputStream = socket.getInputStream();
outputStream.write("GET /java.txt\n".getBytes());
Scanner sc = new Scanner(System.in);
System.out.println("Please insert the sender name:");
if(socket.isConnected()==true){
while(sc.hasNextLine())
{
sender = sc.nextLine();
ClientPeer client = new ClientPeer(sender, socket);
client.sendMessage(sender);
client.sendMessage(sender+"John");
}}
} catch (Exception e) {
System.out.println("Communication problem" + e.getMessage());
}
}
}
/*
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*/
package poo_tema4;
import java.io.Serializable;
/**
*
* @author Stefan
*/
public class Message implements Serializable {
private String senderName;
private String content;
public Message(String senderName, String content) {
this.senderName = senderName;
this.content = content;
}
public String getMessage() {
String returnedMessage = senderName + ": " + content;
return returnedMessage;
}
}
/*
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* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package poo_tema4;
import java.io.Serializable;
/**
*
* @author Stefan
*/
public class PrivateMessage implements Serializable {
private String senderName;
private String content;
private String receiverName;
public PrivateMessage(String senderName, String content, String receiverName) {
this.senderName = senderName;
this.content = content;
this.receiverName = receiverName;
}
public String getPrivateMessage() {
String returnedMessage = "(priv)"+senderName + ": " + content;
return returnedMessage;
}
public String getReceiverName() {
return receiverName;
}
}
我得到的错误是通信问题连接被拒绝：连接。
答案 0 :(得分：1)
您得到的错误是因为没有服务器侦听localhost：9000
更具体地说，这一行：
socket = new Socket("127.0.0.1",9000);
尝试在端口127.0.0.1上打开与9000的网络连接。当没有任何内容监听该套接字以接受连接时，您将收到IOException并显示消息“Connection refused”。
我建议将来不要处理这样的错误：
} catch (Exception e) {
System.out.println("Communication problem" + e.getMessage());
}
您输出堆栈跟踪以及将为您提供引发原始异常的行号：
} catch (Exception e) {
System.out.println("Communication problem");
e.printStackTrace();
}