• spring-mvc实现模拟数据到网页展示过程代码


         spring-mvc实现模拟数据到网页展示过程代码

      先看看我们的3种模拟数据到网页展示的思路图:

        

      1.当mybatis的环境配置完成。一个动态Web项目建立好。开始导入jar包。

          -spring的aop,aspects,context,beans,core,expression,jdbc,tx,web,webmvc jar包导入

          -log4j 核心包2个

          -aopjar包:aopaliance-1.0jar,aspectjweaver-1.8.10jar

          -jstl.jar,standard.jar

          16个jar以及 jdk jar导入

        一个项目的开始就是环境的配置与你所要使用的jar包的导入。

       2.然后我们开始配置web.xml文件。(web.xml配置等于注解)

    <!-- 配置一个servlet -->
        <servlet>
            <servlet-name>show</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <!-- 因为前端控制器DispatcherServlet需要与处理器映射器,处理器配饰器,视图解析器进行信息交互, 需要知道这些对象在哪里配置,
            由spring进行管理 ,于是指定 spring-mvc.xml文件
             如果不指定,核心配置器会在Servlet-name/Servlet.xml其他对象。
            也就是回到springmvc/servlet.xml找
            。 -->
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:spring/spring-mvc.xml</param-value>
            </init-param>
        </servlet>
        <servlet-mapping>
            <servlet-name>show</servlet-name>
         <!-- url --> <url-pattern>*.action</url-pattern> </servlet-mapping>

        方法1:1)spring-mvc.xml配置(Controller)通过bean的name属性值查找bean

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/tx 
         http://www.springframework.org/schema/tx/spring-tx.xsd 
         http://www.springframework.org/schema/mvc 
         http://www.springframework.org/schema/mvc/spring-mvc.xsd ">
        <!--开启类自动扫描配置-->
        <context:component-scan base-package="com.Controller" />
        <!-- (前端控制器自动配置,不需要id调用)
        配置处理器适配器 :HandlerAdapter SimpleControllerHandlerAdapter:该适配器只能处理实现Controller的对象 -->
      <bean
          class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
     <!-- 处理器映射器 HandlerMapping BeanNameUrlHandlerMapping映射器:只能通过bean的name属性值查找bean,也就是url一定是某个 -->

      <bean
        class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />

     <!-- 视图解析器 View Resolver -->
        <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver" />
            
        <!-- 处理器Handler/Controller -->
        <!-- HandlerMapping BeanNameUrlHandlerMapping映射器 :-->
        <bean name="/userss.action" class="com.Controller.UsersController"></bean>
    </beans>

               2)bean:UsersBean,Controler:UsersController;

    package com.bean;
    
    public class UsersBean {
        
        private int uid;
        private String uname;
        private String upwd;
    
        public UsersBean(int uid, String uname, String upwd) {
            super();
            this.uid = uid;
            this.uname = uname;
            this.upwd = upwd;
        }
    
        public UsersBean() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        public int getUid() {
            return uid;
        }
    
        public void setUid(int uid) {
            this.uid = uid;
        }
    
        public String getUname() {
            return uname;
        }
    
        public void setUname(String uname) {
            this.uname = uname;
        }
    
        public String getUpwd() {
            return upwd;
        }
    
        public void setUpwd(String upwd) {
            this.upwd = upwd;
        }
    
    }
    package com.Controller;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.Controller;
    
    import com.bean.UsersBean;
    
    public class UsersController implements Controller {
    
        @Override
        public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
            // 模拟业务层返回数据
            List<UsersBean> list = new ArrayList<>();
            UsersBean u1 = new UsersBean(1, "hehe", "123");
            UsersBean u2 = new UsersBean(1, "haha", "123");
            UsersBean u3 = new UsersBean(1, "xixi", "123");
            list.add(u1);
            list.add(u2);
            list.add(u3);
            ModelAndView mav = new ModelAndView();
            mav.addObject("USERS", list);
            mav.setViewName("page/showAllUsers.jsp");
            return mav;
        }
    
    }

    方法2: 1)HttpController:根据httpResquetHandler适配器,spring-mvc.xml配置

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/tx 
         http://www.springframework.org/schema/tx/spring-tx.xsd 
         http://www.springframework.org/schema/mvc 
         http://www.springframework.org/schema/mvc/spring-mvc.xsd ">
        <!--开启类自动扫描配置-->
        <context:component-scan base-package="com.Controller" />
        <!-- (前端控制器自动配置,不需要id调用)
        配置处理器适配器:                 
        -->
      <bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"></bean>
    <!-- handler.SimpleUrlHandlerMapping:实现多个url对应同一个controller,但是不能处理不同的业务 --> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/users.action">https</prop> <prop key="/user.action">https</prop> </props> </property> </bean> <!-- 视图解析器 View Resolver --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" /> <!-- 处理器Handler/Controller --> <!-- handler.SimpleUrlHandlerMapping映射器 --> <bean id="https" class="com.Controller.HttpController"></bean> </beans>

          2)httpController:

    package com.Controller;
    
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    
    import javax.servlet.*;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.HttpRequestHandler;
    
    import com.bean.UsersBean;
    
    public class HttpController implements HttpRequestHandler {
    
        @Override
        public void handleRequest(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            // TODO Auto-generated method stub
            List<UsersBean> list = new ArrayList<>();
    
            UsersBean u1 = new UsersBean(1, "aaaa", "222");
            UsersBean u2 = new UsersBean(2, "aadaa", "2");
            UsersBean u3 = new UsersBean(3, "da", "333");
            list.add(u1);
            list.add(u2);
            list.add(u3);
            // 数据存入request
            request.setAttribute("USERS", list);
            request.getRequestDispatcher("page/showAllUsers.jsp").forward(request, response);
        }
    
    }

    方法3:1)注解:Annotation,spring-mvc.xml配置

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/tx 
         http://www.springframework.org/schema/tx/spring-tx.xsd 
         http://www.springframework.org/schema/mvc 
         http://www.springframework.org/schema/mvc/spring-mvc.xsd ">
        <!--开启类自动扫描配置-->
        <context:component-scan base-package="com.Controller" />
        <!--开启注解自动扫描配置 -->
        <mvc:annotation-driven />
        <!-- 视图解析器 View Resolver -->
        <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver" />
    </beans>

        2)UsersAnnotation:class类

    package com.Controller;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.servlet.ModelAndView;
    
    import com.bean.UsersBean;
    
    //处理器 @Controller
    public class AnnotionUsers {
      //请求转发地址 value=“” @RequestMapping(
    "/all.action") public ModelAndView queryAll() { List<UsersBean> list = new ArrayList<>(); UsersBean u1 = new UsersBean(1, "hehe", "222"); UsersBean u2 = new UsersBean(2, "aadaa", "2"); UsersBean u3 = new UsersBean(3, "da", "333"); list.add(u1); list.add(u2); list.add(u3); ModelAndView mav = new ModelAndView(); mav.addObject("USERS", list); mav.setViewName("page/showAllUsers.jsp"); return mav; } @RequestMapping("/hehe.action") public ModelAndView modify() { ModelAndView mav = new ModelAndView(); mav.addObject("USERS", "修改页面"); mav.setViewName("page/haha.jsp"); return mav; } }

    3)在浏览器种测试:

        

        现在我们来总结一下我写的一群代码:

          主要分为3点,3种方法实现从模拟数据dao网页页面展示。

          1.使用bean的Name属性传递请求转发的Url;

            适配器:SimpleControllerHandlerAdapter

            映射器:BeanNameUrlHandlerMapping

            试图解析器:InternalResourceViewResolver

            处理器(自己手动写Controller):UsersController

          2.使用该适配器只能处理实现HttpRequestHandler接口的对象 所以在controller中科院使用请求和响应对象,于是可以通过ajax返回json对象 

            适配器:HttpRequestHandlerAdapter

            映射器:SimpleUrlHandlerMapping (设置属性mappings)

            试图解析器:InternalResourceViewResolver

            处理器(自己手动写HttpController):HttpController

          3.注解 (@Controller,@ResquestMapping(value="URL"))

            开启注解扫描:<mvc:annotation-driven />

            试图解析器:InternalResourceViewResolver

            处理器(自己手动写HttpController):Annotation

        三种方式实现数据到页面的加载方式,完成了。

        有问题请留言!!!

            

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  • 原文地址:https://www.cnblogs.com/meiLinYa/p/8729500.html
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