springMvc整合spring

简介：本文技术要点springMvc整合spring开发问题

1、项目清单

2、项目顺序源码

[html]  view plain  copy package com.atguigu.springmvc;    import org.springframework.beans.factory.annotation.Autowired;  import org.springframework.stereotype.Controller;  import org.springframework.web.bind.annotation.RequestMapping;    @Controller  public class HelloWorld {        @Autowired      private UserService userService;            public HelloWorld() {          System.out.println("HelloWorld Constructor...");      }            @RequestMapping("/helloworld")      public String hello(){          System.out.println("success");          System.out.println(userService);          return "success";      }        }   [html]  view plain  copy package com.atguigu.springmvc;    import org.springframework.beans.factory.annotation.Autowired;  import org.springframework.stereotype.Service;    @Service  public class UserService {        @Autowired      private HelloWorld helloWorld;            public UserService() {          System.out.println("UserService Constructor...");      }        }  

 解析：

SpringMVC 的 IOC 容器中的 bean 可以来引用 Spring IOC 容器中的 bean. 返回来呢 ? 反之则不行. Spring IOC 容器中的 bean 却不能来引用 SpringMVC IOC 容器中的 bean!

3、springMvc.xml配置讲解

[html]  view plain  copy <?xml version="1.0" encoding="UTF-8"?>  <beans xmlns="http://www.springframework.org/schema/beans"      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xmlns:context="http://www.springframework.org/schema/context"      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/context http://www.springframework.org/schema/context/spring-context-4.0.xsd          http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">        <!--            需要进行 Spring 整合 SpringMVC 吗 ?          还是否需要再加入 Spring 的 IOC 容器 ?          是否需要再 web.xml 文件中配置启动 Spring IOC 容器的 ContextLoaderListener ?                    1. 需要: 通常情况下, 类似于数据源, 事务, 整合其他框架都是放在 Spring 的配置文件中(而不是放在 SpringMVC 的配置文件中).          实际上放入 Spring 配置文件对应的 IOC 容器中的还有 Service 和 Dao.           2. 不需要: 都放在 SpringMVC 的配置文件中. 也可以分多个 Spring 的配置文件, 然后使用 import 节点导入其他的配置文件      -->            <!--            问题: 若 Spring 的 IOC 容器和 SpringMVC 的 IOC 容器扫描的包有重合的部分, 就会导致有的 bean 会被创建 2 次.          解决:          1. 使 Spring 的 IOC 容器扫描的包和 SpringMVC 的 IOC 容器扫描的包没有重合的部分.           2. 使用 exclude-filter 和 include-filter 子节点来规定只能扫描的注解      -->            <!--            SpringMVC 的 IOC 容器中的 bean 可以来引用 Spring IOC 容器中的 bean.           返回来呢 ? 反之则不行. Spring IOC 容器中的 bean 却不能来引用 SpringMVC IOC 容器中的 bean!      -->            <context:component-scan base-package="com.atguigu.springmvc" use-default-filters="false">          <context:include-filter type="annotation"               expression="org.springframework.stereotype.Controller"/>          <context:include-filter type="annotation"               expression="org.springframework.web.bind.annotation.ControllerAdvice"/>      </context:component-scan>        <!-- 配置视图解析器 -->      <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">          <property name="prefix" value="/WEB-INF/views/"></property>          <property name="suffix" value=".jsp"></property>      </bean>            <mvc:default-servlet-handler/>      <mvc:annotation-driven></mvc:annotation-driven>        </beans>  

 

4、spring.xml配置讲解

[html]  view plain  copy <?xml version="1.0" encoding="UTF-8"?>  <beans xmlns="http://www.springframework.org/schema/beans"      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xmlns:context="http://www.springframework.org/schema/context"      xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd          http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">        <context:component-scan base-package="com.atguigu.springmvc">          <context:exclude-filter type="annotation"               expression="org.springframework.stereotype.Controller"/>          <context:exclude-filter type="annotation"               expression="org.springframework.web.bind.annotation.ControllerAdvice"/>      </context:component-scan>        <!-- 配置数据源, 整合其他框架, 事务等. -->    </beans>  

 

5、web.xml配置讲解

[html]  view plain  copy <?xml version="1.0" encoding="UTF-8"?>  <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xmlns="http://java.sun.com/xml/ns/javaee"      xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"      id="WebApp_ID" version="2.5">            <!-- 配置启动 Spring IOC 容器的 Listener -->      <!-- needed for ContextLoaderListener -->      <context-param>          <param-name>contextConfigLocation</param-name>          <param-value>classpath:beans.xml</param-value>      </context-param>        <!-- Bootstraps the root web application context before servlet initialization -->      <listener>          <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>      </listener>            <servlet>          <servlet-name>springDispatcherServlet</servlet-name>          <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>          <init-param>              <param-name>contextConfigLocation</param-name>              <param-value>classpath:springmvc.xml</param-value>          </init-param>          <load-on-startup>1</load-on-startup>      </servlet>        <servlet-mapping>          <servlet-name>springDispatcherServlet</servlet-name>          <url-pattern>/</url-pattern>      </servlet-mapping>        </web-app>  

6、顺序jsp页面写法(success.jsp和abc.html没什么意义)

[html]  view plain  copy <%@ page language="java" contentType="text/html; charset=UTF-8"      pageEncoding="UTF-8"%>  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  <html>  <head>  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  <title>Insert title here</title>  </head>  <body>        <a href="helloworld">Hello World</a>    </body>  </html>