java swing示例

Posted 2020-07-18 乐之者

该范例主要是JFrame(框架)和Jpanel(画板)，在Jpanel容器上添加控件，然后再把Jpanel放进JFrame的容器里面。

 

FrameDemo.java

import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.JFrame;


public class FrameDemo extends JFrame{
    public static void main(String[] args)  throws Exception {
        
        //获取主显示器屏幕大小 
        Toolkit kit = Toolkit.getDefaultToolkit(); 
        Dimension screenSize = kit.getScreenSize(); 
        int screenWidth = screenSize.width; 
        int screenHeight = screenSize.height; 

        //设置界面组件
        ComponentDemo component = new ComponentDemo();
        FrameDemo frameDemo = new FrameDemo();
        frameDemo.setContentPane(component);   //将Panel放入到Frame中
        frameDemo.setSize(400, 500);
        frameDemo.setLocation(screenWidth / 2 - 390 / 2, screenHeight / 2 - 580 / 2);
        frameDemo.setVisible(true);
    
    }

}

 

ComponentDemo.java

package com.example.swingdemo;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.PrintWriter;
import java.io.StringWriter;

import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JTextPane;



public class ComponentDemo extends JPanel implements ActionListener {
    //JLabel是标签，JTextField是文本框
    private JLabel phoneLabel = null;
    private JTextField phoneText = null;


    private JButton btnQuery = null;
    
    private JLabel contentLabel = null;
    private JTextPane contentPane = null;


    public ComponentDemo() {
        super();
        initialize();
    }

    private void initialize() {

        phoneLabel = new JLabel();
        phoneLabel.setBounds(new java.awt.Rectangle(10, 10, 70, 22));
        phoneLabel.setText("电话号码:");
        this.setLayout(null);
        this.add(phoneLabel, null);
        this.add(getPhoneText(), null);
        
        this.add(getBtnQuery(), null);
        
        this.add(getContentLabel(), null);
        this.add(getContentPaneText(), null);

    }

    private JTextField getPhoneText() {
        if (phoneText == null) {
            phoneText = new JTextField();
            phoneText.setBounds(new java.awt.Rectangle(80, 10, 100, 22));
        }
        return phoneText;
    }



    private JLabel getContentLabel() {
        if (contentLabel == null) {
            contentLabel = new JLabel();
            contentLabel.setText("内容如下:");
            contentLabel.setBounds(new java.awt.Rectangle(10, 70, 70, 22));
        }
        return contentLabel;
    }

    private JTextPane getContentPaneText() {
        if (contentPane == null) {
            contentPane = new JTextPane();
            contentPane.setEditable(false);
            contentPane.setBounds(new java.awt.Rectangle(10, 90, 350, 150));
        }
        return contentPane;
    }




    private JButton getBtnQuery() {
        if (btnQuery == null) {
            btnQuery = new JButton("查询UserId");
            btnQuery.setBounds(new java.awt.Rectangle(10, 45, 100, 22));
//            btnQuery.setText("查询");
            btnQuery.addActionListener(this);         //注册监听事件
        }
        return btnQuery;
    }


//    private OperateAction business = null;
//    static Logger logger = Logger.getLogger(UserIdComponent.class.getName());

    public void actionPerformed(ActionEvent e) {
        //在这里添加按下按钮后的触发事件
        
        try {

            String btnName = e.getActionCommand();
            if (btnName.equals("查询UserId")) {
                contentPane.setEditable(true);  //设置文本框为可编辑 
                String phoneNumber=phoneText.getText();    //获取电话号码
                String outputString="phoneNumber是"+phoneNumber+"\\nUserId我并不知道啦\\n"+"啦啦啦/啦啦啦/我是可爱的小胖妞^_^";
                contentPane.setText(outputString);    
            } 
        } catch (Exception e1) {
            StringWriter trace = new StringWriter();
            e1.printStackTrace(new PrintWriter(trace));
        }    
    }

}

代码运行结果如下：