1. 你自己编写一个JDBC测试代码，看是否能链接上这个数据库表。输出一下Connection对象看是不是null，null就是连不上。

2. 不要只给红叉截图，红叉只能说明这个类有错误，具体是什么错误看eclipse的错图提示。

Exception in thread "AWT-EventQueue-0" java.lang.Error: 无法解析的编译问题：

at zzk.zhuoyue.daohang.MainDaohangFrame.launch(MainFrame.java:1283)

at zzk.zhuoyue.daohang.LoginFrame$PanelBack.btn_enterActionPerformed(LoginFrame.java:256)

at zzk.zhuoyue.daohang.LoginFrame$PanelBack.pwd_passwordActionPerformed(LoginFrame.java:293)

at zzk.zhuoyue.daohang.LoginFrame$PanelBack.access$1(LoginFrame.java:292)

at zzk.zhuoyue.daohang.LoginFrame$PanelBack$2.actionPerformed(LoginFrame.java:193)

at javax.swing.JTextField.fireActionPerformed(JTextField.java:492)

at javax.swing.JTextField.postActionEvent(JTextField.java:705)

at javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:820)

at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)

at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)

at javax.swing.JComponent.processKeyBindings(JComponent.java:2884)

at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)

at java.awt.Component.processEvent(Component.java:5993)

at java.awt.Container.processEvent(Container.java:2041)

at java.awt.Component.dispatchEventImpl(Component.java:4583)

at java.awt.Container.dispatchEventImpl(Container.java:2099)

at java.awt.Component.dispatchEvent(Component.java:4413)

at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)

at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:704)

at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:969)

at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:841)

at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:668)

at java.awt.Component.dispatchEventImpl(Component.java:4455)

at java.awt.Container.dispatchEventImpl(Container.java:2099)

at java.awt.Window.dispatchEventImpl(Window.java:2475)

at java.awt.Component.dispatchEvent(Component.java:4413)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Exception in thread "AWT-EventQueue-0" java.lang.Error: 无法解析的编译问题：

现在不报任何错误，但是在Eclipse控制台中一直返回这些错误消息。

看无法编译的代码中红色狼线的错误提示