[英]JntelliJ can't find driver class
我使用IntelliJ IDEA 14.0,Tomcat服务器和h2数据库来创建简单的Web App。 不幸的是,当我运行该应用程序时,我收到异常消息
java.lang.ClassNotFoundException:org.h2.Driver
我将h2 jar文件存储在名为“ db”的文件夹中,并设置了“添加为库”功能。 我这样连接到数据库:
public class DBConn {
private static final String DRIVER = "org.h2.Driver";
private static final String URL = "jdbc:h2:tcp://localhost/~/BigPicture";
private static final String USERNAME = "doncho";
private static final String PASS = "";
private static DBConn instance;
private static Connection conn;
private DBConn(){
}
public static DBConn getInstance(){
if(instance == null){
instance = new DBConn();
}
return instance;
}
public Connection getConnectivity(){
try {
Conn();
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
private void Conn() throws SQLException{
if(conn == null){
try {
Class.forName(DRIVER);
} catch (ClassNotFoundException e) {
System.out.println("No Driver Found");
e.printStackTrace();
}
DriverManager.getConnection(URL, USERNAME, PASS);
}
}
public void Disconnect(){
if(conn != null){
try {
conn.close();
conn = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
我在Servlet中调用数据库。
public class DBServlet extends HttpServlet {
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Connection conn = DBConn.getInstance().getConnectivity();
System.out.println("It Work's");
DBConn.getInstance().Disconnect();
}
输出显示“未找到驱动程序”,并引发java.lang.ClassNotFoundException: org.h2.Driver.
重要的是,当我在Main
方法IntelliJ fInd h2
驱动程序中调用类DBConn
()时,但是Tomcat仍然不能。
请帮忙,因为我是IntelliJ和Eclipse的新用户,但我想将IntelliJ用于我的项目。
最好的祝福。
将驱动程序的jar文件放在$ TOMCAT_HOME / lib或yourapp / WEB-INF / lib上
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