Java实验报告计12—2.doc

内蒙古科技大学信息工程学院计算机系Java核心技术（上）实验报告 姓名刘如意学号1267111215实验成绩班级计算机2班实验日期 第 8周 周三 4月15日下午实验名称上机练习实验内容package lyb;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.BufferedReader;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.io.PrintWriter;import java.util.Calendar;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;public class ChuangKou implements ActionListener String string=;JTextArea jTextArea;JFrame jFrame;JButton button1;JButton button2;JButton button3;JPanel panel;JPanel panel2;private String file =F:/留言版/1.txt;public static void main(String args)new ChuangKou().gui();public void gui()jFrame =new JFrame(简易留言板);jTextArea =new JTextArea(20,20);panel =new JPanel();panel2=new JPanel();panel.setLayout(new GridLayout(1,2);panel2.setLayout(new GridLayout(1,1);button1=new JButton(查看/刷新留言);button2=new JButton(我要留言);button3=new JButton(清空历史留言);panel.add(button1,West);panel.add(button2,Center);panel.add(button3,East);jFrame.add(panel,North);jFrame.add(panel2,East);jFrame.addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e)System.exit(0););button1.addActionListener(this);button2.addActionListener(this);button3.addActionListener(this);jTextArea.setLineWrap(true) ;JScrollPane jScrollPane =new JScrollPane(jTextArea);jFrame.getContentPane().add(jScrollPane);jScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);panel2.add(jScrollPane,East);jFrame.add(jTextArea,Center);jFrame.setSize(400,500);jFrame.setLocation(300,100);jFrame.setVisible(true);public static String nowTime() Calendar time = Calendar.getInstance(); return time.getTime().toString() ; Overridepublic void actionPerformed(ActionEvent e) String s=e.getActionCommand();if(s.equals(查看/刷新留言)string=;jTextArea.setText();jTextArea.setText(dufile();else if(s.equals(我要留言)button2.setActionCommand(提交留言);button2.setText(提交留言);jTextArea.setText(nowTime();else if(s.equals(提交留言)String x=string+n+jTextArea.getText();xiefile(x);jTextArea.setText(留言已提交);button2.setActionCommand(我要留言);button2.setText(我要留言);else if(s.equals(清空历史留言)xiefile();public String dufile()try BufferedReader bufferedReader=new BufferedReader(new FileReader(file);String string1=bufferedReader.readLine();while(string1!=null) string=string+n+string1; string1 = bufferedReader.readLine();bufferedReader.close(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();return string;public void xiefile(String string)try PrintWriter printWriter =new PrintWriter(new