Optimize project structure, add log4j2.

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

@@ -0,0 +1,21 @@
+package com.cfive.classroom.student;
+
+import com.cfive.classroom.library.database.Test;
+
+import javax.swing.*;
+
+public class MainWindow {
+
+    private JPanel rootPanel;
+
+    public static void main(String[] args) {
+        JFrame frame = new JFrame("MainWindow");
+        frame.setContentPane(new MainWindow().rootPanel);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.pack();
+        frame.setVisible(true);
+
+        com.cfive.classroom.library.net.Test.run();
+        Test.run();
+    }
+}