Init Center,Chat,CheckIn,dataSources,MainWindow,PoolHelper,SendMessage

.idea/dataSources.xml

@@ -8,5 +8,12 @@
       <jdbc-url>jdbc:mysql://10.14.0.7:3306/class</jdbc-url>
       <working-dir>$ProjectFileDir$</working-dir>
     </data-source>
+    <data-source source="LOCAL" name="class@0.tcp.jp.ngrok.io" uuid="c575a4fb-f9e1-448c-9434-8ae2fb826731">
+      <driver-ref>mysql.8</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>com.mysql.cj.jdbc.Driver</jdbc-driver>
+      <jdbc-url>jdbc:mysql://0.tcp.jp.ngrok.io:10088/class</jdbc-url>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
   </component>
 </project>

Library/src/main/java/com/cfive/classroom/library/database/PoolHelper.java

@@ -28,6 +28,7 @@ public class PoolHelper {
         config.setJdbcUrl(JDBC_URL);
         config.setUsername(JDBC_USERNAME);
         config.setPassword(JDBC_PASSWORD);
+        config.setInitializationFailTimeout(30000);
         config.addDataSourceProperty("cachePrepStmts", CACHE_PREP_STMTS);
         config.addDataSourceProperty("prepStmtCacheSize", PREP_STMT_CACHE_SIZE);
         config.addDataSourceProperty("maximumPoolSize", MAXIMUM_POOL_SIZE);

Student/src/main/java/com/cfive/classroom/student/Center.java

@@ -33,7 +33,7 @@ public class Center {
     private JTextField stuNoText;
     private JTextField stuNameText;
     private JButton signInButton;
-    private static JFrame frame = new JFrame("Center");
+    private static JFrame frame = new JFrame("课堂互动通");
     private StudentNet studentNet;
     private String host;
     private int port;
@@ -57,7 +57,6 @@ public class Center {
             @Override
             public void actionPerformed(ActionEvent e) {
                 LOGGER.info("chatButton.studentNet"+studentNet);
-
                 if (studentNet != null) {
                     if (flag == false) {
                         chat = new Chat(studentNet,stuNo,stuName,chatReceiveListener);
@@ -135,29 +134,37 @@ public class Center {
         raiseHandButton.addActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
+                if (studentNet != null) {
                     LOGGER.info(stuNo+stuName);
                     messageObject = new MessageObject(stuNo, stuName, null, null, null, null,null,MessageType.RaiseHand);
                     studentNet.sendMessage(messageObject);
                     LOGGER.info(messageObject.getStuNo()+messageObject.getStuName());
                     JOptionPane.showMessageDialog(null,"你已经向老师举手");
+                } else {
+                    JOptionPane.showMessageDialog(null,"没有连接至教师");
+                }
             }
         });
         //签到
         signInButton.addActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
+                if (studentNet != null) {
                     if (getSignInCode != null) {
                         signInCode = JOptionPane.showInputDialog(null, "签到码：", "签到", JOptionPane.PLAIN_MESSAGE);
                         LOGGER.info(getSignInCode);
                         if (getSignInCode.equals(signInCode)) {
                             studentNet.sendMessage(new MessageObject(stuNo, stuName, null, null, null, AttStatus.signed, LocalDateTime.now(), MessageType.CheckIn));
-                        LOGGER.info(stuNo+""+stuName);
+                            LOGGER.info(stuNo + "" + stuName);
                             JOptionPane.showMessageDialog(null, "签到成功");
                         } else {
                             JOptionPane.showMessageDialog(null, "签到失败");
                         }
                     } else {
-                    JOptionPane.showMessageDialog(null,"无签到码");
+                        JOptionPane.showMessageDialog(null, "无签到码");
+                    }
+                } else {
+                    JOptionPane.showMessageDialog(null,"没有连接至教师");
                 }
             }
         });
@@ -173,15 +180,6 @@ public class Center {
         frame.setVisible(true);
     }
 
-    public static void main(String[] args) {
-        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-        frame.setContentPane(center.rootpanel);
-        frame.setSize(600,400);
-        frame.setLocationRelativeTo(null);
-        frame.setResizable(false);
-        frame.setVisible(true);
-
-    }
     //获取学生姓名
     public String getName(String stuNo){
         String name = null;

Student/src/main/java/com/cfive/classroom/student/Chat.java

@@ -28,7 +28,7 @@ public class Chat {
             @Override
             public void actionPerformed(ActionEvent e) {
                 String sendMessage = sendText.getText();
-                if(sendMessage!=null) {
+                if(sendMessage.length()!=0) {
                     LOGGER.info(stuNo+stuName);
                     receiveText.append("我："+LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy年MM月dd日 HH时mm分ss秒"))+"\n"+sendMessage+"\n");
                     studentNet.sendMessage(new MessageObject(stuNo, stuName, null,sendText.getText() ,null,null,LocalDateTime.now(),MessageType.Chat));

Student/src/main/java/com/cfive/classroom/student/MainWindow.java

@@ -24,6 +24,7 @@ public class MainWindow{
     private JLabel password;
     private static JFrame frame = new JFrame("学生登录界面");
     private static final Logger LOGGER = LogManager.getLogger();
+    private boolean isConnectedToDatabase = false;
     public MainWindow() {
         //登录按钮
         passwordText.addKeyListener(new KeyListener() {
@@ -73,6 +74,7 @@ public class MainWindow{
         try {
             LOGGER.info(DatabaseHelper.checkPasswdInStudent(Long.parseLong(stuNo), stuPassword));
             checkPassword = DatabaseHelper.checkPasswdInStudent(Long.parseLong(stuNo), stuPassword);
+            isConnectedToDatabase = true;
         } catch (NoConfigException e) {
             JOptionPane.showMessageDialog(null,"没有数据库配置文件","警告",JOptionPane.ERROR_MESSAGE);
             LOGGER.error("No configuration", e);
@@ -85,6 +87,11 @@ public class MainWindow{
             LOGGER.error("NoSuchAlgorithmException",e);
         } catch (InvalidKeySpecException e) {
             LOGGER.error("InvalidKeySpecException",e);
+        }finally {
+            if (!isConnectedToDatabase) {
+                JOptionPane.showMessageDialog(null, "无法连接到数据库", "错误", JOptionPane.ERROR_MESSAGE);
+            }
+            isConnectedToDatabase = false;
         }
         return checkPassword;
     }
@@ -93,7 +100,6 @@ public class MainWindow{
         FlatLightLaf.setup();
         frame.setContentPane(mainWindow.rootPanel);
         frame.setSize(600,400);
-        frame.setTitle("登录");
         frame.setLocationRelativeTo(null);
         frame.setVisible(true);
         frame.setResizable(false);

Teacher/src/main/java/com/cfive/classroom/teacher/CheckIn.java

@@ -78,7 +78,9 @@ public class CheckIn {
                 if(e.getKeyChar()==KeyEvent.VK_ENTER){
                     //获取签到码广播出去
                     number = textField1.getText() + textField2.getText() + textField3.getText() + textField4.getText();
-                    if (number != null) {
+                    LOGGER.info(number.length());
+                    LOGGER.info(number);
+                    if (number .length() == 4) {
                         teacherNet.sendAllMessage(new MessageObject(null, null, number, null, null, null, null, MessageType.CheckIn));
                         JOptionPane.showMessageDialog(null, "签到码发布成功", "消息", JOptionPane.INFORMATION_MESSAGE);
                         frame.setVisible(false);
@@ -97,7 +99,9 @@ public class CheckIn {
             @Override
             public void actionPerformed(ActionEvent e) {
                 number = textField1.getText() + textField2.getText() + textField3.getText() + textField4.getText();
-                if (number != null) {
+                LOGGER.info(number.length());
+                LOGGER.info(number);
+                if (number .length() == 4) {
                     teacherNet.sendAllMessage(new MessageObject(null, null, number, null, null, null, null, MessageType.CheckIn));
                     JOptionPane.showMessageDialog(null, "签到码发布成功", "消息", JOptionPane.INFORMATION_MESSAGE);
                     frame.setVisible(false);

Teacher/src/main/java/com/cfive/classroom/teacher/SendMessage.java

@@ -43,7 +43,7 @@ public class SendMessage {
             @Override
             public void actionPerformed(ActionEvent e) {
                 String messageToAll = messageInput.getText();
-                if(messageToAll!=null){
+                if(messageToAll.length()!=0){
                     LocalDateTime sendTime = LocalDateTime.now();
                     messageShow.append("@所有人:  "+sendTime.format(DateTimeFormatter.ofPattern("yyyy年MM月dd日 HH时mm分ss秒"))+'\n'+messageToAll+'\n');
                     MessageObject messageObject = new MessageObject(null,null,null,"@所有人:"+messageToAll,null,null,null,MessageType.ChatToAll);