1.c3p0.properties：連線資料庫

driver=com.mysql.jdbc.Driver
jdbcUrl = jdbc:mysql://localhost:3306/test
username = root
password = root

2.必須定義一個類整合JFinalConfig類

import com.jfinal.config.*;
import com.jfinal.kit.PropKit;
import com.jfinal.plugin.activerecord.ActiveRecordPlugin;
import com.jfinal.plugin.c3p0.C3p0Plugin;
 
import com.jfinal.render.ViewType;

public class MyJfinalConfig extends JFinalConfig {

    /**
     * 配置常量
     * @param constants
     */
    @Override
    public void configConstant(Constants constants) {
        constants.setViewType(ViewType.JSP);
        //讀取外部檔案
        PropKit.use("c3p0.properties");
    }

    
 
/**
     * 配置訪問路由
     * @param routes
     */
    @Override
    public void configRoute(Routes routes) {
        routes.add("/users",UsersController.class);
    }

    /**
     * 配置外掛
     * @param plugins
     */
    @Override
    public void configPlugin(Plugins plugins) {
        //配置連線池
        //輸入庫連線池
 

        C3p0Plugin c3p0Plugin = new C3p0Plugin(PropKit.get("jdbcUrl"), PropKit.get("username"), PropKit.get("password"));
        //ORM Activerecord
        ActiveRecordPlugin arp = new ActiveRecordPlugin(c3p0Plugin);
        arp.setShowSql(true);
        arp.addMapping("users", Users.class);
        plugins.add(c3p0Plugin);
        plugins.add(arp);
    }

    /**
     * 全域性攔截器
     * @param interceptors
     */
    @Override
    public void configInterceptor(Interceptors interceptors) {

    }

    /**
     * 控制器
     * @param handlers
     */
    @Override
    public void configHandler(Handlers handlers) {

    }
}

3.測試

import com.jfinal.core.Controller;public class UsersController extends Controller {

    /**
     * 訪問該類時，預設訪問index方法
     */
    public void index(){
      render("index.jsp");
    }

}