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!!!