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“Add as library”功能。 我像这样连接到DB:
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”并抛出java.lang.ClassNotFoundException: org.h2.Driver.
这是重要的,当我在DBConn
方法IntelliJ fInd Main
驱动程序中调用类h2
()时,但Tomcat仍然不能。
请帮忙,因为我是IntelliJ和Eclipse的新手这个应用程序工作,但我想将IntelliJ用于我的项目。
最好的问候。
答案 0 :(得分:0)
将驱动程序的jar文件放在$ TOMCAT_HOME / lib或yourapp / WEB-INF / lib
上