1.聊天客户端文本框的搭建.

项目截图:java project

代码:

(1).ChatManager.java

package com.nantian.javachatclient.main;

import com.nantian.javachatclient.view.MainWindow;

public class ChatManager {

//将类单例化的步骤就是讲他的构造方法变成private

//ChatManager就会有唯一的实例

private ChatManager() {}

private static final ChatManager instance=new ChatManager();

public static ChatManager getChatManager() {

return instance;

}

//具体实现连接服务器的操作

public void connect(String ip) {

}

//"发送"按钮发送内容函数

public void send(String out) {

}

//界面中只能向chatManager发送数据,那么接收到数据后怎样放到界面上呢?

//需要对MainWindow有个引用,并为它实现setWindow方法

MainWindow window;

public void setWindow(MainWindow window) {

this.window=window;

//传递之后

window.appendText("文本框已经和ChatManager绑定了!");

}

}

(2).StartClient.java

package com.nantian.javachatclient.main;

import java.awt.EventQueue;

import com.nantian.javachatclient.view.MainWindow;

public class StartClient {

/**

* 将窗体主方法放到了这里

* @param args

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

MainWindow frame = new MainWindow();

frame.setVisible(true);

//创建window的时候,对MainWindow有个引用

ChatManager.getChatManager().setWindow(frame);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

}

(3).MainWindow.java

new -->project-->web builder-->JFrame(需要下载web builder插件!)

package com.nantian.javachatclient.view;

import java.awt.BorderLayout;

import java.awt.EventQueue;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

import com.nantian.javachatclient.main.ChatManager;

import javax.swing.JTextArea;

import javax.swing.GroupLayout;

import javax.swing.GroupLayout.Alignment;

import javax.swing.LayoutStyle.ComponentPlacement;

import javax.swing.JTextField;

import javax.swing.JButton;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

public class MainWindow extends JFrame {

/**

*

*/

private static final long serialVersionUID = 1L;

private JPanel contentPane;

//文本控件声明到类中,让他作为类的变量

JTextArea txt;

private JTextField IP;

private JTextField send;

/**

* Create the frame.

*/

public MainWindow() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 450, 300);

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

txt = new JTextArea();

txt.setText("Ready...");

IP = new JTextField();

IP.setText("127.0.0.1");

IP.setColumns(10);

JButton button = new JButton("连接到服务器");

button.addMouseListener(new MouseAdapter() {

//mouse-->clicked自动创建的代码

@Override

public void mouseClicked(MouseEvent e) {

//为"连接到服务器"按钮添加动作

//使用函数把它和这个按钮的监听事件绑定起来

ChatManager.getChatManager().connect(IP.getText());

}

});

send = new JTextField();

send.setText("你好!");

send.setColumns(10);

JButton button_1 = new JButton("发送");

button_1.addMouseListener(new MouseAdapter() {

//为"发送"按钮添加动作

@Override

public void mouseClicked(MouseEvent e) {

//当前文本发送呢内容

ChatManager.getChatManager().send(send.getText());

appendText("我说:"+send.getText());

//发送出去后,需要将当前文本框清空

send.setText("");

}

});

GroupLayout gl_contentPane = new GroupLayout(contentPane);

gl_contentPane.setHorizontalGroup(

gl_contentPane.createParallelGroup(Alignment.LEADING)

.addGroup(Alignment.TRAILING, gl_contentPane.createSequentialGroup()

.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)

.addComponent(txt, GroupLayout.DEFAULT_SIZE, 414, Short.MAX_VALUE)

.addGroup(Alignment.LEADING, gl_contentPane.createSequentialGroup()

.addComponent(IP)

.addPreferredGap(ComponentPlacement.RELATED)

.addComponent(button))

.addGroup(gl_contentPane.createSequentialGroup()

.addComponent(send, GroupLayout.DEFAULT_SIZE, 295, Short.MAX_VALUE)

.addPreferredGap(ComponentPlacement.RELATED)

.addComponent(button_1, GroupLayout.PREFERRED_SIZE, 129, GroupLayout.PREFERRED_SIZE)))

.addContainerGap())

);

gl_contentPane.setVerticalGroup(

gl_contentPane.createParallelGroup(Alignment.LEADING)

.addGroup(gl_contentPane.createSequentialGroup()

.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)

.addComponent(IP, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)

.addComponent(button))

.addPreferredGap(ComponentPlacement.RELATED)

.addComponent(txt, GroupLayout.DEFAULT_SIZE, 193, Short.MAX_VALUE)

.addPreferredGap(ComponentPlacement.RELATED)

.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)

.addComponent(send, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)

.addComponent(button_1)))

);

contentPane.setLayout(gl_contentPane);

}

public void appendText(String in) {

txt.append("\n"+in);

}

}

操作截图:

=============================================================================================================

框架已搭建完成,聊天客户端的核心内容见:使用 Java 创建聊天客户端-2