studentinfo.java.bak

Java就业的培训教程书籍

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

public class StudentInfo implements MouseListener,WindowListener{
    //为界面设计声明成员变量
    private Frame frObj;
    private Checkbox checkObj;
    private CheckboxGroup groupObj;
    private Checkbox checkObj1,checkObj2;
    private TextField tfObj;
    private List listObj;
    private Choice choiceObj;
    private TextArea taObj;
    private Button butObj1,butObj2;
    private Label labObj1,labObj2,labObj3,labObj4,labObj5;
    private Panel panelObj1,panelObj2,panelObj3,panelObj4,panelObj5,panelObj6;
    
    public static void main(String args[]){
    	StudentInfo stuObj = new StudentInfo();
    	stuObj.create();
    }
    //在这个例子中，使用了四种常用容器
    public void create()
    {
    	    //实例化一个标题为Student information example的Frame对象
	    frObj = new Frame("Student information example");
	    //生成“是否注册”复选框
	    checkObj = new Checkbox("是否注册");
	    //生成“姓名”文本以及对应的文本框
	    labObj1 = new Label("姓名：");
	    tfObj   = new TextField(20);
	    //生成“性别“文本以及对应的两个单选钮
	    labObj2 = new Label("性别：");
	    groupObj = new CheckboxGroup();
	    checkObj1 = new Checkbox("男",groupObj,true);
	    checkObj2 = new Checkbox("女",groupObj,false);
	    //生成”年级“文本以及对应的List对象
	    labObj3 = new Label("年级：");
	    listObj = new List(4,false);
	    listObj.add("一年级");
	    listObj.add("二年级");
	    listObj.add("三年级");
	    listObj.add("四年级");
	    //生成”系别“文本以及对应的Choice对象
	    labObj4 = new Label("系别：");
	    choiceObj = new Choice();
	    choiceObj.add("计算机");
	    choiceObj.add("数学");
	    choiceObj.add("物理");
	    choiceObj.add("外语");
	    //生成”显示一个学生所有信息“文本以及用于信息显示的文本区域
	    labObj5 = new Label("显示一个学生所有信息：");
	    taObj = new TextArea();
	    //生成”显示“和”保存“按钮
	    butObj1 = new Button("显示");
	    butObj2 = new Button("保存");
	    //实例化6个Panel对象，用于界面上各组件位置的控制
	    panelObj1 = new Panel();
	    panelObj2 = new Panel();
	    panelObj3 = new Panel();
	    panelObj4 = new Panel();
	    panelObj5 = new Panel();
	    panelObj6 = new Panel();
	    /*为panelObj1设置布局管理器，使学生姓名和是否注册复选框位于同一行上*/	    
	    panelObj1.setLayout(new FlowLayout(FlowLayout.CENTER,20,20));
	    panelObj1.add(checkObj);
	    panelObj1.add(labObj1);
	    panelObj1.add(tfObj);
	    /*为panelObj2设置布局管理器，设置”性别“文本和两个单选钮成纵向分布*/
	    panelObj2.setLayout(new GridLayout(3,1));
	    panelObj2.add(labObj2);
	    panelObj2.add(checkObj1);
	    panelObj2.add(checkObj2);
	    /*panelObj3控制”年级“文本和List组件的位置关系*/
	    panelObj3.setLayout(new BorderLayout());
	    panelObj3.add("North",labObj3);
	    panelObj3.add("Center",listObj);
	    /*panelObj4控制”系别“文本和Choice组件的位置关系*/
	    panelObj4.setLayout(new BorderLayout());
	    panelObj4.add("North",labObj4);
	    panelObj4.add("Center",choiceObj);
	    /*panelObj5控制”显示一个学生所有信息“文本和TextArea组件的位置关系*/
	    panelObj5.setLayout(new BorderLayout());
	    panelObj5.add("North",labObj5);
	    panelObj5.add("Center",taObj);
	    /*panelObj6控制”显示“和”保存“按钮的位置关系*/
	    panelObj6.setLayout(new FlowLayout(FlowLayout.CENTER,80,20));
	    panelObj6.add(butObj1);
	    panelObj6.add(butObj2);
	    /*声明GridBagLayout和GridBagConstraints对象，用于控制整个界面的布局*/
	    GridBagLayout gridbag = new GridBagLayout();
	    GridBagConstraints c = new GridBagConstraints();
	    //为Frame设置GridBagLayout布局管理器
	    frObj.setLayout(gridbag);
	    //下面四行语句使学生姓名和”是否注册“复选框占一行显示
	    c.gridwidth = GridBagConstraints.REMAINDER;
	    c.weightx = 1.0;
	    gridbag.setConstraints(panelObj1,c);
	    frObj.add(panelObj1);
	    
	    /*下面的11行语句将性别、年级和系别三部分上端对齐显示*/
	    c.anchor = GridBagConstraints.NORTH;
	    c.gridwidth = 1;
	    c.gridheight = 4;
	    c.weightx = 1.0;
	    gridbag.setConstraints(panelObj2,c);
	    gridbag.setConstraints(panelObj3,c);
	    frObj.add(panelObj2);
	    frObj.add(panelObj3);
	    c.gridwidth = GridBagConstraints.REMAINDER;
	    gridbag.setConstraints(panelObj4,c);
	    frObj.add(panelObj4);
	    
	    /*下面5行语句使”显示一个学生所有信息“文本和对应的文本区域在性别、年级、系别三部分下面显示*/
	    c.gridwidth = GridBagConstraints.REMAINDER;
	    c.gridheight = 4;
	    c.weightx = 1.0;
	    gridbag.setConstraints(panelObj5,c);
	    frObj.add(panelObj5);
	    /*下面三行语句将”显示“按钮和”保存“按钮另起一行显示*/
	    c.gridwidth = GridBagConstraints.RELATIVE;
	    gridbag.setConstraints(panelObj6,c);
	    frObj.add(panelObj6);
	    
	    //下面的两个语句设置窗口以紧凑的方式显示
	    frObj.pack();
	    frObj.setVisible(true);
	    //为按钮和窗口注册事件注册器
	    butObj1.addMouseListener(this);
	    butObj2.addMouseListener(this);
	    frObj.addWindowListener(this);
   }
	    
   /**方法mouseClicked用于处理鼠标单击的事件，也就是当鼠标单击事件发生后，程序就会进入该方法中执行*/ 
   public void mouseClicked(MouseEvent e){
   	//下面这个语句用于获得事件源按钮
   	Button butObj = (Button)(e.getSource()); 
   	/*声明一个String型变量tempStr，用于获得界面上不同组件的字符串内容*/
   	String tempStr;
   	/*声明一个StringBuffer对象totalBuf，用来进行字符串的处理操作*/
   	StringBuffer totalBuf = new StringBuffer();
   	String totalStr;
   	Checkbox tempCheck = groupObj.getSelectedCheckbox();
   	/*下面这段代码用来将有关的学生信息组合起来，用一个字符串totalStr表示*/
   	tempStr = tfObj.getText();
   	totalBuf.append(tempStr);
   	if(checkObj.getState()==true)
   		totalBuf.append("  已注册");
   	else totalBuf.append("  未注册");
   	tempStr = tempCheck.getLabel();
   	totalBuf.append("  "+tempStr);
   	tempStr = listObj.getSelectedItem();
   	totalBuf.append("  "+tempStr);
   	tempStr = choiceObj.getSelectedItem();
   	totalBuf.append("  "+tempStr);
   	totalStr = totalBuf.toString();
   	/*下面是根据单击不同的按钮执行不同的操作*/
   	//如果单击的是"显示"按钮，就将信息显示在文本区域中
   	if(butObj.getLabel()=="显示")
   	{
   		taObj.setText(totalStr);
   	}
   	//如果单击的是"保存"按钮，就将学生信息保存在文件中
   	else if(butObj.getLabel()=="保存")
   	{
   		//实例化InfoSave类的一个对象
   		InfoSave saveObj = new InfoSave();
   		/*调用InfoSave类的writeFun方法将学生信息写入文件中*/
   		saveObj.writeFun(totalStr);
   	}

    }
    //下面的语句重写MouseListener和WindowListener接口中的方法
    public void mouseEntered(MouseEvent e){}
    public void mouseExited(MouseEvent e){}
    public void mousePressed(MouseEvent e){}
    public void mouseReleased(MouseEvent e){}
    //重写windowClosing方法，关闭窗口时，程序退出
    public void windowClosing(WindowEvent e){
    	System.exit(0);
    }
    public void windowOpened(WindowEvent e){}	
    public void windowIconified(WindowEvent e){}
    public void windowDeiconified(WindowEvent e){}
    public void windowClosed(WindowEvent e){}
    public void windowActivated(WindowEvent e){}
    public void windowDeactivated(WindowEvent e){}	 
}
//类InfoSave用于将信息写入到文件中存储起来
class InfoSave{
	boolean boolObj;
	public void writeFun(String str){
	    try{
	    	//创建一个File对象fileObj
		File fileObj = new File("stuIfo.txt");
		/*下面的语句首先通过使用getBytes()方法将参数字符串放到一个byte数组中，"8859_1"用于
		指定编码方式，使得输入的汉字可以正确的输入到文件中*/
		String wrStr = new String(str.getBytes(),"8859_1");
		/*如果当前目录下不存在stuIfo.txt文件，就创建该文件*/
		if(fileObj.exists()==false)  
			boolObj = fileObj.createNewFile();
		/*创建一个RandomAccessFile对象，用于进行随机访问文件的处理*/
		RandomAccessFile ranFile = new RandomAccessFile(fileObj,"rw");
		//下面两个语句将文件指针放在文件的结尾处
		long len = ranFile.length();
		ranFile.seek(len);
		//将字符串wrStr写入文件的结尾处
		ranFile.writeBytes("\r\n"+wrStr);
		ranFile.close();
	    }catch(UnsupportedEncodingException e){
	    	System.out.println(e);
	    }catch(IOException e){
	    	System.out.println(e);
	    }
	}
}