Optimize project structure, add log4j2.

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

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+<?xml version="1.0" encoding="UTF-8"?>
+<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="com.cfive.classroom.student.MainWindow">
+  <grid id="27dc6" binding="rootPanel" layout-manager="GridLayoutManager" row-count="1" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+    <margin top="0" left="0" bottom="0" right="0"/>
+    <constraints>
+      <xy x="20" y="20" width="500" height="400"/>
+    </constraints>
+    <properties/>
+    <border type="none"/>
+    <children/>
+  </grid>
+</form>

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

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+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();
+    }
+}