jfinal简单实用

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1.创建一个项目，然后导入Jfinal的相关包 链接: https://pan.baidu.com/s/1sluj1Ad 密码: 3ivc
2.创建一个MainConfig.java继承JFinalConfig
package demo;

import com.jfinal.config.Constants;
import com.jfinal.config.Handlers;
import com.jfinal.config.Interceptors;
import com.jfinal.config.JFinalConfig;
import com.jfinal.config.Plugins;
import com.jfinal.config.Routes;
import com.jfinal.core.JFinal;
import com.jfinal.ext.handler.ContextPathHandler;
import com.jfinal.kit.PropKit;
import com.jfinal.plugin.activerecord.ActiveRecordPlugin;
import com.jfinal.plugin.c3p0.C3p0Plugin;
import com.jfinal.render.ViewType;
import com.jfinal.template.Engine;



public class DemoConfig extends JFinalConfig {
    /**
     * 此方法用来配置 JFinal 常量值
     */
    public void configConstant(Constants me) 
    {
        //设置视图类型
        me.setViewType(ViewType.JSP);
        //读取外部文件
        PropKit.use("config.properties");
    }

    /**
     * 此方法用来配置 JFinal 访问路由
     */
    public void configRoute(Routes me) {
        //更改路由
        me.add("/user", UserController.class);
    }

    /**
     * 此方法用来配置 JFinal 的 Plugin
     */
    public void configPlugin(Plugins me) {
        // TODO Auto-generated method stub
        //输入库连接池
        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("user", User.class);
        me.add(c3p0Plugin);
        me.add(arp);
    }

    /**
     * 此方法用来配置 JFinal  的全局拦截器
     */
    public void configInterceptor(Interceptors me) 
    {
        // TODO Auto-generated method stub
    }
    /**
     * 此方法用来配置 JFinal 的 Handler
     */
    public void configHandler(Handlers me)
    {

    }

    public void configEngine(Engine me) 
    {

    }
    public static void main(String[] args) {
        JFinal.start("WebRoot", 80, "/", 5);
    }

    

}
3.创建一个实例user
package demo;

import com.jfinal.plugin.activerecord.Model;


public class User extends Model<User> 
{
    public static final User dao=new User();
}
4.创建一个UserController
package demo;

import java.util.List;

import com.jfinal.core.Controller;

public class UserController extends Controller 
{
    /**
     * 直接访问user地址进入list.jsp
     */
    public void index(){
        //执行sql语句，得到数据库的数据
        List<User> users=User.dao.find("select * from user");
        //封装发到前端
        setAttr("users", users);
        System.out.println("得到数据"+users.size()+"个");
        //将数据在list页面中渲染出来
        render("list.jsp");
    }
    /**
     * 访问user/form 地址进入form.jsp
     */
    public void form(){
        //得到前端传过来的id
        Integer id=getParaToInt(0);
        if(id!=null&&id>0){
            setAttr("user", User.dao.findById(id));
        }
        render("form.jsp");
    }
    /**
     * 数据提交
     */
    public void submit(){
        //得到前端传来的user数值
        User user=getModel(User.class,"user");
        user.save();
        //返回到user界面
        redirect("/user");
    }
    public void update(){
        User user=getModel(User.class,"user");
        user.update();
        redirect("/user");
    }
    public void edit(){
        form();
    }
    public void del(){
        //得到前端传来的id，并执行sql语句
        User.dao.deleteById(getPara(0));
        redirect("/user");
    }
}
5.前端的页面list.jsp和form.jsp

list.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="${base_path}/" />
  </head>
  

    <div >
        <div>
            <div><a href="user/form">新增用户</a></div>
            <table border="2" width="50%" align="center">
                <caption><h1>测试页面</h1></caption>            
                <thead><th>ID</th><th>姓名</th><th>年龄</th><th>性别</th><th>备注</th><th>操作</th></thead>   
                <tbody>     
                <c:forEach items="${users}" var="user">
                <tr><td>${user.id}</td><td>${user.name}</td><td>${user.age}</td><td>${user.sex}</td><td>${user.remark}</td><td><a href="user/edit/${user.id }">修改</a></td><td><a href="user/del/${user.id }">删除</a></td></tr>
                </c:forEach>
                </tbody>
            </table>
            
        </div>
    </div>
</html>

form.jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

 <header class="navbar navbar-static-top" id="top" role="banner">

</header>
<body>
    <form action="${user==null?'/user/submit':'/user/update'}" method="post">
    <input type="hidden" name="user.id" value="${user.id}">
    <label>姓名</label>
    <input type="text" name="user.name" value="${user.name}">
    <label>年龄</label>
    <input type="text" name="user.age" value="${user.age}">
    <div >
    <label>性别</label>
    <div>
    <input type="radio"  name="user.sex" <c:if test="${user.sex=='男'}">checked="checked"</c:if>value="男"> 男
    </div>
    <div>
    <input type="radio"   name="user.sex" <c:if test="${user.sex=='女'}">checked="checked"</c:if>value="女"> 女
    </div>
    </div>
    <label>备注</label>
    <textarea rows="10" cols="20" name="user.remark">${user.remark}</textarea>
    <button type="submit">提交</button>
    </form>
</body>
7.config.properties文件,填写相关的数据库驱动，表名，用户名和密码
driver=com.mysql.jdbc.Driver
jdbcUrl = jdbc:mysql://localhost:3306/test
username = root
password =root



作者：ccq_inori
链接：https://www.jianshu.com/p/de2d4b24ff26

posted @ 2021-11-06 22:58  枫叶鎏霜  阅读(132)  评论(0)    收藏  举报