实验目的

(1)熟练进行GUI编程，包括布局管理、事件处理和常用容器和控件(2)联合异常类

(3)联合文件类

(4)联合集合类

实验内容:
新建Java项目，命名为guiprj.在项目中新建- -个名为symexample包，在该包内新建下面的各个类。设计主窗口， 假设类名为FrameMain,含有菜单栏(MenuBar, JMenu和JMenultem).菜单包括“注册”，“查询"，“退出"， 其中.

1.点击“注册"菜单, 弹出一个类名为FrameRegister窗口.

(1)请在该窗口用文本框，标签，下拉列表，列表，复选框，单选框和按钮等设计一个学生信息(学号，姓名，性别，城市，爱好等)注册界面

(2)在该界面中放置-个“新增”按钮，可以把用户设定的注册信息存到- -个集合类中(建议设定一个Student类,再新建- -个ArrayList alstudents对象，新增的学生信息先存放到alstudents中) ;

(3)再放置-一个“保存’按钮，点击该按钮，可以把用户此次输入的所有学生的注册信息(建议把alstudents里的所有学生-个个取出进行存放，不要直接把alstudents存放到文件)存储到guiprij 项目根目录下的student.xt文件中(先判断文件是否存在，如果存在,要以新内容可以添加到文件尾部的方式打开文件，即需要支持多次注册);

(4)以上功能实现可以选择适合的任意文件流进行数据的存储，注意必要的异常处理。

2.点击"查询"菜单， 弹出一个类名为FrameBrowse窗口,

(1)界面类似“注册"窗口。

(2)打开该窗口时，它自动读取student.txt里的内容，把里面的每个学生读取出来放到一个HashMap结构中，里面关键字key是学号，其它信息想办法存储到它的value项。默认把第一个学生的信息在界面中相应的控件里显示出来。

(3) 放置一个名为"next的按钮， 点击它，可以提取HashMap并在界面里展现下一个学生的信息，放置一个名为"previous"的按钮，点击它，可以提取和展现前一-个学生的信息。

3.点击"退出"菜单，点击后弹出"是否真要退出?"的对话框，点击否不退出，点击’'确定“退出整个系统。

代码如下：

package symexample;import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.swing.*;class Student {
//学生类存放学号、姓名、性别、地址、爱好String idnumber;String name;String sex;String address;String hobby;public String getIdnumber() {return idnumber;}public String getName() {return name;}public String getSex() {return sex;}public String getAddress() {return address;}public String getHobby() {return hobby;}public void setIdnumber(String idnumber) {this.idnumber=idnumber;}public void setName(String name) {this.name = name;}public void setSex(String sex) {this.sex=sex;}public void setAddress(String address) {this.address=address;}public void setHobby(String hobby) {this.hobby=hobby;}//重写输出格式@Overridepublic String toString() {return idnumber + " " + name + " " + sex + " " + address+" +hobby"+"\n";}
}
public class FrameMain extends JFrame {public static void main(String args[]) {FrameMain test=new FrameMain();test.setVisible(true);}//初始窗口public FrameMain() {setTitle("初始窗口");setBounds(100,100,210,75);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);final JButton b1=new JButton();final JButton b2=new JButton();final JButton b3=new JButton();b1.setText("注册");b2.setText("查询");b3.setText("退出");b1.addActionListener(new ButtonAction1());b2.addActionListener(new ButtonAction2());b3.addActionListener(new ButtonAction3());final FlowLayout flowlayout=new FlowLayout();flowlayout.setAlignment(FlowLayout.LEFT);getContentPane().setLayout(flowlayout);getContentPane().add(b1);getContentPane().add(b2);getContentPane().add(b3);}//点击注册按钮事件处理器class ButtonAction1 implements ActionListener{public void actionPerformed(ActionEvent e) {try {new FrameRegister();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}//点击查询按钮事件处理器class ButtonAction2 implements ActionListener{int num=1;public void actionPerformed(ActionEvent j) {//先将文件中内容读取存储到hashmap中Map<String,String>treemap=new HashMap<String,String>();try {	InputStreamReader f1=new InputStreamReader(new FileInputStream("D:\\Student.txt"));BufferedReader b1=new BufferedReader(f1);String aline1;while((aline1=b1.readLine())!=null) {String str1=new String(aline1);String[] str=str1.split(" ", 2);treemap.put(str[0], str[1]);}f1.close();b1.close();}catch(Exception e) {e.printStackTrace();}Set<String>arg=treemap.keySet();//建立数组存储信息方便读取String[] temp=new String[arg.size()];Iterator<String>it4=arg.iterator();int flag=0;while(it4.hasNext()) {temp[flag]=it4.next();flag++;}String n=temp[0];String m=treemap.get(n);String[] ac=m.split(" ");//初始化界面JFrame frame=new JFrame();JLabel label1 = new JLabel();JLabel label2 = new JLabel();JLabel label3 = new JLabel();JLabel label4 = new JLabel();JLabel label5 = new JLabel();JTextField text1 = new JTextField();JTextField text2 = new JTextField();JTextField text3 = new JTextField();JTextField text4 = new JTextField();JTextField text5 = new JTextField();Font font = new Font("宋体",Font.PLAIN,20);JButton b1 = new JButton();JButton b2 = new JButton();frame.setBounds(100, 100, 350, 300);frame.add(label1);frame.setLayout(null);frame.add(label2);frame.add(label3);frame.add(label4);frame.add(label5);frame.add(text1);frame.add(text2);frame.add(text3);frame.add(text4);frame.add(text5);frame.add(b1);frame.add(b2);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);label1.setText("学号:");label1.setFont(font);label1.setBounds(30, 15, 50, 20);		label2.setText("姓名:");label2.setFont(font);label2.setBounds(30,55, 50, 20);label3.setText("性别");label3.setFont(font);label3.setBounds(30, 95, 50, 20);label4.setText("地址:");label4.setFont(font);label4.setBounds(30, 135, 50, 20);label5.setText("爱好:");label5.setFont(font);label5.setBounds(30, 175, 50, 20);text1.setBounds(100, 10, 200, 30);text1.setFont(font);	text2.setBounds(100, 50, 200, 30);text2.setFont(font);		text3.setBounds(100, 90, 200, 30);text3.setFont(font);		text4.setBounds(100, 130, 200, 30);text4.setFont(font);text5.setBounds(100, 170, 200, 30);text5.setFont(font);text1.setText(n);text2.setText(ac[0]);text3.setText(ac[1]);text4.setText(ac[2]);text5.setText(ac[3]);b1.setText("previous");b1.setBounds(50, 220, 120, 30);b1.setFont(font);b2.setText("next");b2.setBounds(210, 220, 80, 30);b2.setFont(font);//点击privious按钮处理事件b1.addMouseListener(new MouseListener() {public void mouseReleased(MouseEvent e) {}public void mousePressed(MouseEvent e) {}public void mouseExited(MouseEvent e) {}public void mouseEntered(MouseEvent e) {}public void mouseClicked(MouseEvent e) {//当读到第一个学生无法继续privious时，重置指针到第一个位置if(num<=0 || num>=arg.size()) {num=arg.size()-1;System.out.println("已经是第一个学生了！");}String n=temp[num];String m=treemap.get(n);String[] ac=m.split(" ");text1.setText(n);text2.setText(ac[0]);text3.setText(ac[1]);text4.setText(ac[2]);text5.setText(ac[3]);num--;}});//点击next按钮处理事件b2.addMouseListener(new MouseListener() {public void mouseReleased(MouseEvent e) {}public void mousePressed(MouseEvent e) {}public void mouseExited(MouseEvent e) {}public void mouseEntered(MouseEvent e) {}public void mouseClicked(MouseEvent e) {//当读到第一个学生无法继续next时，重置指针到最后一个位置if(num<=0 || num>=arg.size()) {num=0;System.out.println("已经是最后一个学生了！");}String n=temp[num];String m=treemap.get(n);String[] ac=m.split(" ");text1.setText(n);text2.setText(ac[0]);text3.setText(ac[1]);text4.setText(ac[2]);text5.setText(ac[3]);num++;}});}}//点击退出按钮事件处理器class ButtonAction3 implements ActionListener{public void actionPerformed(ActionEvent w) {int result = JOptionPane.showConfirmDialog(null, "是否真要退出?", "确认",JOptionPane.OK_CANCEL_OPTION, JOptionPane.INFORMATION_MESSAGE);if(result == JOptionPane.OK_OPTION)System.exit(0);}}//注册按钮界面的实现类class FrameRegister extends JFrame{public List<Student> allstudent= new ArrayList();public JLabel label1 = new JLabel();public JLabel label2 = new JLabel();public JLabel label3 = new JLabel();public JLabel label4 = new JLabel();public JLabel label5 = new JLabel();public JTextField text1 = new JTextField();public JTextField text2 = new JTextField();public JTextField text3 = new JTextField();public JTextField text4 = new JTextField();public JTextField text5 = new JTextField();Font font = new Font("宋体",Font.PLAIN,20);public JButton b1 = new JButton();public JButton b2 = new JButton();FrameRegister() throws IOException{this.setBounds(100, 100, 350, 300);set();this.add(label1);this.setLayout(null);this.add(label2);this.add(label3);this.add(label4);this.add(label5);this.add(text1);this.add(text2);this.add(text3);this.add(text4);this.add(text5);this.add(b1);this.add(b2);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setVisible(true);//新增按钮事件处理b1.addMouseListener(new MouseListener() {public void mouseReleased(MouseEvent e) {}public void mousePressed(MouseEvent e) {}public void mouseExited(MouseEvent e) {}public void mouseEntered(MouseEvent e) {}public void mouseClicked(MouseEvent e) {String idnumber = text1.getText();String name = text2.getText();String sex= text3.getText();String address=text4.getText();String hobby=text5.getText();Student student=new Student();student.setIdnumber(idnumber);student.setName(name);student.setSex(sex);student.setAddress(address);student.setHobby(hobby);allstudent.add(student);}});//保存按钮事件处理b2.addMouseListener(new MouseListener() {public void mouseReleased(MouseEvent e) {}public void mousePressed(MouseEvent e) {}public void mouseExited(MouseEvent e) {}public void mouseEntered(MouseEvent e) {}public void mouseClicked(MouseEvent e) {String idnumber = text1.getText();String name = text2.getText();String sex= text3.getText();String address=text4.getText();String hobby=text5.getText();String result=idnumber + " " + name + " " + sex + " " + address+" "+hobby+"\n";File file=new File("D:\\student.txt");    if(!file.exists()){    try {    file.createNewFile();} catch (IOException k) {      k.printStackTrace();    }    }try {FileWriter fos=new FileWriter(file,true);fos.write(result);fos.close(); }catch (IOException m) {       m.printStackTrace();    }}});}//查询界面初始化public void set() {label1.setText("学号:");label1.setFont(font);label1.setBounds(30, 15, 50, 20);		label2.setText("姓名:");label2.setFont(font);label2.setBounds(30,55, 50, 20);label3.setText("性别");label3.setFont(font);label3.setBounds(30, 95, 50, 20);label4.setText("地址:");label4.setFont(font);label4.setBounds(30, 135, 50, 20);label5.setText("爱好:");label5.setFont(font);label5.setBounds(30, 175, 50, 20);text1.setBounds(100, 10, 200, 30);text1.setFont(font);	text2.setBounds(100, 50, 200, 30);text2.setFont(font);		text3.setBounds(100, 90, 200, 30);text3.setFont(font);		text4.setBounds(100, 130, 200, 30);text4.setFont(font);text5.setBounds(100, 170, 200, 30);text5.setFont(font);b1.setText("新增");b1.setBounds(60, 220, 80, 30);b1.setFont(font);b2.setText("保存");b2.setBounds(200, 220, 80, 30);b2.setFont(font);}}
}

运行结果示例：




其中，在读取已写好的文件时，点击next或是privious按钮有时会出现显示的不是目标行的情况，还望指正。