JFinal使用

忘是亡心i 2022-09-29 01:58 240阅读 0赞

> 下面主要介绍JFinal的最简单的配置，包括路由映射，数据库配置和操作，返回结果。

1.在web.xml中做如下配置：

<filter>
        <filter-name>jfinal</filter-name>
        <filter-class>com.jfinal.core.JFinalFilter</filter-class>
        <init-param>
            <param-name>configClass</param-name>
            <param-value>com.xxh.demo.DemoConfig</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>jfinal</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

2.新建配置文件DemoConfig，**其实这里主要注意的是数据库的配置即可，虽然路由也可以在这里配置，但是一般都使用注解了。**

public class DemoConfig extends JFinalConfig { 
    
        @Override
        public void configConstant(Constants constants) {
            constants.setDevMode(true);
        }
    
        @Override
        public void configRoute(Routes routes) {
    
            routes.add("/hello", HelloController.class);
            routes.add("/blog", BlogController.class);
        }
    
        @Override
        public void configEngine(Engine engine) {
    // engine.addSharedFunction("/_view/common/__layout.html");
    // engine.addSharedFunction("/_view/common/_paginate.html");
    // engine.addSharedFunction("/_view/common/__admin_layout.html");
        }
    
        @Override
        public void configPlugin(Plugins plugins) {
            loadPropertyFile("config.properties");
            System.out.println(getProperty("jdbcUrl") + "..." + getProperty("username") + "..." + getProperty("password"));
            C3p0Plugin cp = new C3p0Plugin(getProperty("jdbcUrl")
                    , getProperty("username"), getProperty("password"));
    
            plugins.add(cp);
    
            ActiveRecordPlugin arp = new ActiveRecordPlugin(cp);
            plugins.add(arp);
    
            /** * 必须加上这个配置，否则getModel的时候会抛出如下异常 * com.jfinal.plugin.activerecord.ActiveRecordException: * The Table mapping of model: * com.xxh.bean.Blog not exists or the ActiveRecordPlugin not start. */
            arp.addMapping("blog", Blog.class);
    
        }
    
        @Override
        public void configInterceptor(Interceptors interceptors) {
    
        }
    
        @Override
        public void configHandler(Handlers handlers) {
    
        }
    }

3.注解路由配置和最简单的返回文本数据和页面

public class HelloController extends Controller { 
    
        public void index() {
            renderText("Hello Jfinal world");
        }
    
        @ActionKey("/login")
        public void login() {
            renderText("login");
        }
    
        @ActionKey("/testRender")
        public void testRender() {
            render("testRender.html");
        }
    
    }

4.对于数据库的操作过程如下：

> 定义Java Bean

public class Blog extends Model \{

public static final Blog me = new Blog();

> 执行数据库的增删查改

下面方法中，返回json数据使用的是`renderJson()`方法，添加的时候需要new对象，其他使用静态公共对象

public class BlogController extends Controller { 
        @ActionKey("/insertTest")
        public void insertTest() {
            Blog blog = new Blog();
            blog.set("title", "xxh").set("content", "hjee").save();
            renderJson(blog.toJson());
        }
    
        @ActionKey("/deleteTest")
        public void deleteTest() {
            boolean flag = Blog.me.deleteById(1);
            renderText(flag+"");
        }
    
        @ActionKey("/updateTest")
        public void updateTest() {
            boolean flag = Blog.me.findByIdLoadColumns(2, "id,title,content").set("title", "gggg").update();
            renderText(flag+"");
        }
    
        @ActionKey("/selectTest")
        public void selectTest() {
            List<Blog> blog = Blog.me.find("select * from blog");
            for (Blog b : blog) {
                System.out.println(b.getInt("userId"));
            }
    
            renderJson(blog);
        }
    
        @ActionKey("/save")
        public void save() {
            String title = getPara("title");
            String content = getPara("content");
            System.out.println(title + "...." + content);
    
            Blog blog = getModel(Blog.class, "");
    
            System.out.println(blog.toJson());
    
    // renderText(blog.toString() + "----" + title + "...." + content);
            renderJson(blog.toJson());
        }
    
        @Before(LoginValidator.class)
        @ActionKey("/testLogin")
        public void testLogin() {
            renderText("testLogin");
        }
    }

> 上面代码还设计了一个验证器的东西，其实就是拦截器，用来验证字段的规则，不符合做相应的跳转之类的，定义如下：

public class LoginValidator extends Validator { 
        @Override
        protected void validate(Controller controller) {
            validateRequiredString("name", "nameMsg", "请输入用户名");
            validateRequiredString("pass", "passMsg", "请输入密码");
        }
    
        @Override
        protected void handleError(Controller controller) {
            controller.keepPara("name");
            controller.render("login.html");
        }
    }