java连接mysql数据库

import java.sql.Connection;
import java.sql.DriverManager;
public class Dbhelper {
private static final String driver = "com.mysql.jdbc.Driver"; //数据库驱动
//连接数据库的URL地址
       private static final String url="jdbc:mysql://127.0.0.1:3306/ansj?useUnicode=true&characterEncoding=utf-8"; 
private static final String username="root";//数据库的用户名
private static final String password="1234";//数据库的密码
    
private static Connection conn=null;
//静态代码块负责加载驱动
static {
try{
Class.forName(driver);
}catch(Exception ex){
ex.printStackTrace();
}
}
public static Connection getConnection() throws Exception{
if(conn==null){
conn = DriverManager.getConnection(url, username, password);
return conn;
}
return conn;
}
public static void main(String[] args) {
try{
Connection conn = Dbhelper.getConnection();
if(conn!=null){
System.out.println("数据库连接正常！");
}else{
System.out.println("数据库连接异常！");
}
}catch(Exception ex){
ex.printStackTrace();
}
}
}