Connection refused: connect求大神帮忙看看，这个怎么解决

[AnnJune]

服务器端：

package hHChat;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

import javax.swing.*;

class ServerGUI extends JPanel implements Runnable{
	//按钮
	private JButton export;//导出聊天记录
	private JButton view;//查看聊天记录
	private JButton send;//发送
	private JButton exit;//退出
	private JButton back;//返回
	//文本
	private JTextArea output;//显示框
	private JTextField input;//输入框
	private String s=" "+"\n\r";
	//聊天记录
	private JTextArea record;
	File file=new File("聊天记录.txt");
	
	ServerSocket SSocket;
	Socket socket;
	int port;
	DataOutputStream outStream;
	DataInputStream inStream;
	
	public static void main(String[] args){
		
		//创建窗口
		JFrame fra=new JFrame("Ann's ChatRoom S");
		
		fra.setContentPane(new ServerGUI());
		fra.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		fra.pack();
		fra.setSize(800,494);
		fra.setLocationRelativeTo(null);
		fra.setVisible(true);
		
		ServerGUI sg=new ServerGUI();
		sg.address();
	}
	
	public ServerGUI(){
		
		
		//创建原件
		export=new JButton("导出");
		view=new JButton("聊天记录");
		send=new JButton("发送");
		exit=new JButton("退出");
		back=new JButton("返回");
		output=new JTextArea();
		input=new JTextField();
		record=new JTextArea();
		//添加事件
		export.addActionListener(new Export());
		view.addActionListener(new View());
		send.addActionListener(new Send());
		exit.addActionListener(new Exit());
		back.addActionListener(new Back());
		
		
		
		//布局
		setLayout(null);
		add(export);
		export.setBounds(640, 20, 100, 30);
		add(view);
		view.setBounds(640, 128, 100, 30);
		add(send);
		send.setBounds(640, 232, 100, 30);
		add(exit);
		exit.setBounds(640,346,100,30);
		add(back);
		back.setBounds(640, 232, 100, 30);
		back.setVisible(false);
		add(output);
		output.setBounds(40, 10, 494, 217);
		output.setEditable(false);
		add(input);
		input.setBounds(40,230,494,217);
		add(record);
		record.setBounds(40, 10, 494, 424);
		record.setEditable(false);
		record.setVisible(false);
		
		
	}
	
	public void address(){
		try {
			SSocket=new ServerSocket(8888);
			System.out.println("Server is created and waiting Client to connect...");
			socket=SSocket.accept();
			output.setText("客户端IP:"+socket.getInetAddress().getHostAddress());
			outStream=new DataOutputStream(socket.getOutputStream());
			inStream=new DataInputStream(socket.getInputStream());
			
			new Thread(this).start();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	}
	
	class Exit implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			System.exit(0);	
		}
		
	}
	
	class Back implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			output.setVisible(true);
			input.setVisible(true);
			send.setVisible(true);
			view.setVisible(true);
			export.setVisible(true);
			
			record.setVisible(false);
			back.setVisible(false);
		}
		
	}
	
	class Export implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			if(!file.exists()){
				try {
					file.createNewFile();
				} catch (IOException e1) {
					// TODO 自动生成的 catch 块
					e1.printStackTrace();
				}
			}
			try {
				PrintWriter out=
						new PrintWriter(new FileWriter(file));
				out.print(output.getText());
				out.close();
			} catch (IOException e1) {
				// TODO 自动生成的 catch 块
				e1.printStackTrace();
			}
			
			
		}
		
	}
	
	class View implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			output.setVisible(false);
			input.setVisible(false);
			send.setVisible(false);
			view.setVisible(false);
			export.setVisible(false);
			
			record.setVisible(true);
			back.setVisible(true);
			
			try {
				BufferedReader read=
						new BufferedReader(new FileReader(file));
				String line=read.readLine();
				while(line!=null){
					record.append(line+"\n\r");
					line=read.readLine();
				}
				read.close();
			} catch (FileNotFoundException e1) {
				// TODO 自动生成的 catch 块
				e1.printStackTrace();
			} catch (IOException e1) {
				// TODO 自动生成的 catch 块
				e1.printStackTrace();
			}
			
		}
		
	}
	
	class Send implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			try {
				//读取input输入框输入的数据并以网络输出流outStream将数据送入网络而输出
				outStream.writeUTF("服务器："+input.getText());
				output.setText(input.getText());
				/*
				 * 读取input输入框输入的数据，记录在output显示框中
				 * s保存之前的对话，使对话能够连续显示
				 */
				String sentence=s;
				while(input.getText()!=null){
					output.setText(sentence+"服务器:"+input.getText()+"\n\r");
					input.setText(null);//清空输入框
					break;
				}
				s=output.getText();
				
			} catch (IOException e1) {
				output.setText("网络连接中断!");
			}
			
		}
		
	}

	public void run() {
		while(true){
			String netTransferLine;
			try {
				netTransferLine = inStream.readUTF();
				output.setText(netTransferLine);
			} catch (IOException e) {
				output.setText("网络连接中断");
			}
			
		}
		
	}
	
	
}

客户端

package hHChat;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

import javax.swing.*;

class ClientGUI extends JPanel implements Runnable{
	//按钮
	private JButton export;//导出聊天记录
	private JButton view;//查看聊天记录
	private JButton send;//发送
	private JButton exit;//退出
	private JButton back;//返回
	//文本
	private JTextArea output;//显示框
	private JTextField input;//输入框
	private String s=" "+"\n\r";
	//聊天记录
	private JTextArea record;
	File file=new File("聊天记录.txt");

	Socket socket;
	static String iaddr;
	static int port;
	DataOutputStream outStream;
	DataInputStream inStream;
	
public static void main(String[] args){
	
	JFrame fra=new JFrame("Ann's ChatRoom C");
	
	fra.setContentPane(new ClientGUI());
	fra.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	fra.pack();
	fra.setSize(800,494);
	fra.setLocationRelativeTo(null);
	fra.setVisible(true);		
		
	ClientGUI cg=new ClientGUI();
	cg.address();
	}
	
	
	public ClientGUI(){
		
		
		//创建原件
		export=new JButton("导出");
		view=new JButton("聊天记录");
		send=new JButton("发送");
		exit=new JButton("退出");
		back=new JButton("返回");
		output=new JTextArea();
		input=new JTextField();
		record=new JTextArea();
		//添加事件
		export.addActionListener(new Export());
		view.addActionListener(new View());
		send.addActionListener(new Send());
		exit.addActionListener(new Exit());
		back.addActionListener(new Back());
		
		
		
		//布局
		setLayout(null);
		add(export);
		export.setBounds(640, 20, 100, 30);
		add(view);
		view.setBounds(640, 128, 100, 30);
		add(send);
		send.setBounds(640, 232, 100, 30);
		add(exit);
		exit.setBounds(640,346,100,30);
		add(back);
		back.setBounds(640, 232, 100, 30);
		back.setVisible(false);
		add(output);
		output.setBounds(40, 10, 494, 217);
		output.setEditable(false);
		add(input);
		input.setBounds(40,230,494,217);
		add(record);
		record.setBounds(40, 10, 494, 424);
		record.setEditable(false);
		record.setVisible(false);
		
	}
	
	public void address(){
		try {
			InetAddress address = InetAddress.getLocalHost();
			String a=address.getHostAddress();
			socket=new Socket(a,8888);
			outStream=new DataOutputStream(socket.getOutputStream());
			inStream=new DataInputStream(socket.getInputStream());
			
			new Thread(this).start();
		} catch (UnknownHostException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		
	}
	
	public void run() {
		while(true){
			try {
				//读取从网络流inStream传送来的数据，存放在netTransferLine中
				String netTransferLine=inStream.readUTF();
				//将netTransferLine中的数据记录在output中
				output.setText(netTransferLine);
			} catch (IOException e) {
				// TODO 自动生成的 catch 块
				output.setText("网络连接断开!");
			}
		}
		
	}
	
	class Exit implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			System.exit(0);	
		}
		
	}
	
	class Back implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			output.setVisible(true);
			input.setVisible(true);
			send.setVisible(true);
			view.setVisible(true);
			export.setVisible(true);
			
			record.setVisible(false);
			back.setVisible(false);
		}
		
	}
	
	class Export implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			if(!file.exists()){
				try {
					file.createNewFile();
				} catch (IOException e1) {
					// TODO 自动生成的 catch 块
					e1.printStackTrace();
				}
			}
			try {
				PrintWriter out=
						new PrintWriter(new FileWriter(file));
				out.print(output.getText());
				out.close();
			} catch (IOException e1) {
				// TODO 自动生成的 catch 块
				e1.printStackTrace();
			}
			
			
		}
		
	}
	
	class View implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			output.setVisible(false);
			input.setVisible(false);
			send.setVisible(false);
			view.setVisible(false);
			export.setVisible(false);
			
			record.setVisible(true);
			back.setVisible(true);
			
			try {
				BufferedReader read=
						new BufferedReader(new FileReader(file));
				String line=read.readLine();
				while(line!=null){
					record.append(line+"\n\r");
					line=read.readLine();
				}
				read.close();
			} catch (FileNotFoundException e1) {
				// TODO 自动生成的 catch 块
				e1.printStackTrace();
			} catch (IOException e1) {
				// TODO 自动生成的 catch 块
				e1.printStackTrace();
			}
			
		}
		
	}
	
	class Send implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			try {
				//读取input输入框输入的数据并以网络输出流outStream将数据送入网络而输出
				outStream.writeUTF("客户端："+input.getText());
				output.setText(input.getText());
				/*
				 * 读取input输入框输入的数据，记录在output显示框中
				 * s保存之前的对话，使对话能够连续显示
				 */
				String sentence=s;
				while(input.getText()!=null){
					output.setText(sentence+"服务器:"+input.getText()+"\n\r");
					input.setText(null);//清空输入框
					break;
				}
				s=output.getText();
				
			} catch (IOException e1) {
				output.setText("网络连接中断!");
			}
			
		}
		
	}
	
}

[AnnJune]

一按发送就报错 Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at hHChat.ClientGUI$Send.actionPerformed(ClientGUI.java:209) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6525) at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) at java.awt.Component.processEvent(Component.java:6290) at java.awt.Container.processEvent(Container.java:2234) at java.awt.Component.dispatchEventImpl(Component.java:4881) at java.awt.Container.dispatchEventImpl(Container.java:2292) at java.awt.Component.dispatchEvent(Component.java:4703) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462) at java.awt.Container.dispatchEventImpl(Container.java:2278) at java.awt.Window.dispatchEventImpl(Window.java:2739) at java.awt.Component.dispatchEvent(Component.java:4703) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746) at java.awt.EventQueue.access$400(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:697) at java.awt.EventQueue$3.run(EventQueue.java:691) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue$4.run(EventQueue.java:719) at java.awt.EventQueue$4.run(EventQueue.java:717) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:716) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) 求大神帮帮忙T.T