Class.forName(driver)出错。(解决)

Class.forName(“com.mysql.jdbc.Driver”);木有问题。 Class.forName(driver);则出错。 但是driver = com.mysql.jdbc.Driver 源码：

package test20160319;

import java.io.FileInputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.Properties;

public class ExecuteDLL {
          
   
    private String driver;
    private String url;
    private String user;
    private String pass;

    public void initParam(String paraFile) throws Exception, IOException{
        Properties props = new Properties();
        props.load(new FileInputStream(paraFile));
        driver = props.getProperty("driver");
        url = props.getProperty("url");
        user = props.getProperty("user");
        pass = props.getProperty("pass");
        System.out.println("driver:"+driver);
    }

    public void createTable(String sql) throws Exception{
        //Class.forName("com.mysql.jdbc.Driver");
        Class.forName(driver);
        try(
                Connection conn = DriverManager.getConnection(url,user,pass);
                //Connection conn = DriverManager.getConnection(url+"?"+"user="+user+"&password="+pass);
                Statement stmt = conn.createStatement()){
            stmt.executeUpdate(sql);
        }
    }
    public static void main(String[] args) throws Exception, Exception {
        // TODO Auto-generated method stub
        new ExecuteDLL().initParam("paramFile.ini");
        new ExecuteDLL().createTable("create table jdbc_test(jdbc_id int auto_increment primary key,jdbc_name varchar(255),jdbc_desc text );");
    }
}

配置文件：

[JDBC]
driver = com.mysql.jdbc.Driver
url = jdbc:mysql://localhost:3306/bbs
username = test
password = test

出错的地方在：

new ExecuteDLL().initParam("paramFile.ini");
        new ExecuteDLL().createTable("create table jdbc_test(jdbc_id int auto_increment primary key,jdbc_name varchar(255),jdbc_desc text );");

new了两次后，不是同一对像，所以找不到。