求助大牛,关于java连接mysql驱动Class.forname(Driver)报错问题

2017-05-03 11:52:32 1k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Java连接MySQL数据库，读取、遍历输出数据库查询结果ResultSet、使用“Class.forName(JDBC_DRIVER)；”来注册加载驱动的原因 MySQL安装、建库、建表、填充数据阅读详情

是这样的,我在eclipse内使用这段代码连接数据库是完全没问题,可以拿到我想要的东西,但导出jar包使用exe4j打成exe文件之后
Class.forName(CGConstants.DRIVER);直接报错,请问是什么问题,代码在最下面

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at auto.GenEntity.<init>(GenEntity.java:71)
at auto.CodeGenerator$4.actionPerformed(CodeGenerator.java:341)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

// 数据库驱动
public static final String DRIVER = "com.mysql.jdbc.Driver";

// 创建连接
Connection con = null;
// 查要生成实体类的表
String sql = "select * from " + CGConstants.tableName;
PreparedStatement pStemt = null;
try {
try {
Class.forName(CGConstants.DRIVER);
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
}
try {
con = DriverManager.getConnection(CGConstants.URL, CGConstants.NAME, CGConstants.PASS);
} catch (Exception e) {
throw new SQLException("数据库连接失败!");
}

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