Java swing的动态实现案例

Java swing （GUI）的动态实现案例：

1、创建一个JFrame，要显示的N个JLabel和JTextField被一个JPanel包含；

2、窗口大小不可变，N大于一定数量时显示滚动条；

4、响应JTextField值变更事件；

3、点击JButton时响应发送JTextField值事件；

package com.hblb.swing;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

public class DataSendRecDemo extends JFrame {  
	  
    private static final long serialVersionUID = 1L;  
  
    private String[] labelName = {"name",  
                                  "address",  
                                  "ID",  
                                  "param4",  
                                  "param5",  
                                  "param6",  
                                  "param7",  
                                  "param8",  
                                  "param9"  
                                  };  //标题名字数组
  
    private String[] textValue = {"tp",  
                                  "xxxx",  
                                  "1234",  
                                  "www",  
                                  "00001",  
                                  "0123456789",  
                                  "abc",  
                                  "123",  
                                  "20120917090233"  
                                  };//
  
    private JPanel jPanel;// 实例化一个面板
    private JLabel jLabel;//实例一个label
    private JTextField jTextField;//实例一个文本编辑字段
    private JButton jButton;//实例一个按钮
    private String[] textValueTemp = textValue;//实例默认值  
      
    public DataSendRecDemo() {//构造函数
        super();  
        initFrame();//初始化
    }  
      
    public static void main(String[] args) {  
        EventQueue.invokeLater(new Runnable() {  
            @Override  
            public void run() {  
                DataSendRecDemo srDemon = new DataSendRecDemo();  
                srDemon.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
                srDemon.setVisible(true);  
                srDemon.setLocation(100, 100);  
                srDemon.setResizable(false);  
            }  
        });  
    }  
      
    public void initFrame() {  
        setTitle("The demon of the iphone send data");//设置窗口标题
        setSize(350, 222);  
          
        jPanel = new JPanel();  
        jPanel.setBorder((BorderFactory.createTitledBorder("Send type struct by key : value")));//设置标题样式 
        jPanel.setLayout(new GridLayout(labelName.length, 2));//设置布局采用网格的样式  行*列
          
        // 动态追加JLabel和JTextField  
        for (int i = 0; i < labelName.length; i++) {  
            jLabel = new JLabel(labelName[i], SwingConstants.LEFT);//设置Label左对齐
            jLabel.setFont(new Font("ITALIC", 0, 14));  
              
            jTextField = new JTextField(textValue[i], SwingConstants.RIGHT);  
            jTextField.setFont(new Font("Dialog", 0, 12));//根据指定名称、样式和磅值大小，创建一个新 Font。
            // 让动态追加的JLabel和JTextField相互匹配  
            jTextField.setName(labelName[i]);  
              
            // 给动态追加的JTextField绑定值变更事件   也就是把改变的值重新绑定下
            jTextField.addFocusListener(new FocusListener() {  
                String valChangedBef = "";  
                String valChangedAft = "";  
                String focusName = "";  
                JTextField focusValue;  
                  
                @Override  
                public void focusLost(FocusEvent e) {  
                    focusValue = (JTextField) e.getComponent();  
                    valChangedAft = focusValue.getText();  
                    if(!valChangedBef.equals(valChangedAft)){  
                        focusName = e.getComponent().getName().toString();//获得label的名字
                        for (int j = 0; j < labelName.length; j++) {  
                            if (focusName.equals(labelName[j])) {  
                                textValueTemp[j] = valChangedAft;  
                            }  
                        }  
                    }  
                }  
                  
                @Override  
                public void focusGained(FocusEvent e) {  
                    focusValue = (JTextField)e.getComponent();  
                    valChangedBef = focusValue.getText();  
                }  
            });  
              
            jPanel.add(jLabel);  
            jPanel.add(jTextField);  
            add(jPanel, BorderLayout.CENTER);//实例化边界布局
        }  
          
        JPanel panel = new JPanel(); //再实例化一个装按钮的面板
        jButton = new JButton("Send　Data");  
          
        jButton.addActionListener(new ActionListener() {  
              
            @Override  
            public void actionPerformed(ActionEvent e) {  
                String sendDataStr = "";  
                for (int k = 0; k < labelName.length; k++) {  
                    sendDataStr += "'" + labelName[k] + "':'" + textValueTemp[k] + "',";  
                }  
                  
                sendDataStr = "{" + sendDataStr.substring(0, sendDataStr.length() - 1) + "}";  
                // 响应JButton事件，发送所有与JLabel一一对应的JTextField数据  
                sendData(sendDataStr);  
            }  
        });  
  
        panel.add(jButton);  
        add(panel, BorderLayout.SOUTH);//把这个面板放到最下面
          
        //这块是边界布局
        JPanel panelN = new JPanel();  
        add(panelN, BorderLayout.NORTH);  
        JPanel panelW = new JPanel();  
        add(panelW, BorderLayout.WEST);  
        JPanel panelE = new JPanel();  
        add(panelE, BorderLayout.EAST);  
          
        // 给JPanel追加垂直滚动条  
        addScroll();  
    }  
      
    public void sendData(String sendData) {  
          
        System.out.println("strMsgjson: " + sendData);  
    }  
      
    public void addScroll() {  
        Container scrollPanel = getContentPane();//获得整个面板内容 
        JScrollPane jScrollPane = new JScrollPane(jPanel);//给这个面板变成有滚动条的面板
        scrollPanel.add(jScrollPane);//然后把带有滚动条的面板加到这个最终的面板上
        scrollPanel.setVisible(true);  
    }  
}