JAVA Swing实现窗口添加课程信息过程解析

package Test;import javax.swing.JButton;import java.io.*;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;public class SetClass {  String str1="添加课程失败，请核对信息后添加",      str2="添加成功";  JFrame jf=new JFrame("新课程添加");  JPanel panel=new JPanel();  JLabel addclass=new JLabel("课程名称");  JTextField addclasstext=new JTextField();  JLabel teacher=new JLabel("任课老师");  JTextField teachertext=new JTextField();  JLabel placeclass=new JLabel("上课地点");  JTextField placeclasstext=new JTextField();  JButton register=new JButton("添加");    public boolean judgeText(String filepath,String s)    //判断信息的合法性  {    String str="";    boolean flag=false;    File file=new File(filepath);    try {      FileReader reader=new FileReader(file);      BufferedReader br=new BufferedReader(reader);      while((str=br.readLine())!=null)      {        if(str.equals(s))          flag=true;      }      br.close();      reader.close();    } catch (FileNotFoundException e) {      // TODO Auto-generated catch block      e.printStackTrace();    } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }        return flag;      }  public void inputFile(String filepath,JTextField jt)  //将信息录入到文件中  {    File file=new File(filepath);    try {      FileWriter reader = new FileWriter(file,true);      BufferedWriter bw=new BufferedWriter(reader);      bw.newLine();      bw.write(jt.getText());      bw.close();    } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }  }  public void setPanel(JPanel panel)    //设置面板  {    panel.setLayout(null);    addclass.setBounds(30, 30, 80, 25);    teacher.setBounds(30, 60, 80, 25);    placeclass.setBounds(30, 90, 80, 25);    register.setBounds(110, 120, 80, 25);    register.addActionListener(new ActionListener() {  //增加事件监听器            @Override      public void actionPerformed(ActionEvent arg0) {        // TODO Auto-generated method stub        if(!judgeText("data", addclasstext.getText())&&judgeText("data", teachertext.getText())&&judgeText("data", placeclasstext.getText().substring(0, 2)))        {          inputFile("data",addclasstext);          inputFile("Xclass",addclasstext);          inputFile("Xclass",teachertext);          inputFile("Xclass",placeclasstext);          new MyJf(str2);        }        else          new MyJf(str1);      }    });    addclasstext.setBounds(105, 30, 165, 25);    teachertext.setBounds(105, 60, 165, 25);    placeclasstext.setBounds(105, 90, 165, 25);    panel.add(addclass);    panel.add(addclasstext);    panel.add(teacher);    panel.add(teachertext);    panel.add(register);    panel.add(placeclass);    panel.add(placeclasstext);  }    SetClass() {               //为JFrame窗口设置窗口参数    // TODO Auto-generated constructor stub    jf.setSize(340, 250);    jf.setLocationRelativeTo(null);    jf.add(panel);    setPanel(panel);    jf.setVisible(true);    jf.setDefaultCloseOperation(3);  }    public static void main(String[] args) {    // TODO Auto-generated method stub    new SetClass();  }}class MyJf            //创建弹出窗口{  JFrame jf1=new JFrame("提示信息");  JPanel jp1=new JPanel();  JLabel jl=new JLabel();  MyJf(String str)  {    jl.setText(str);    jf1.setSize(300, 80);    jf1.setVisible(true);    jf1.add(jp1);    jf1.setDefaultCloseOperation(2);    jf1.setLocationRelativeTo(null);    jp1.add(jl);      }}