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十二、springMVC整合spring

一、概述：
实例验证：
参考：

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一、概述：

需要进行spring 整合 springmvc 吗？或者说还是否需要加入Spring 的IOC容器？是否需要在web.xml文件中配置启动启动Spring IOC容器的ContextLoaderListener?

需要整合：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的配置文件中实际放入Spring配置文件对应的IOC容器中的还有Service 和Dao;
不需要整合：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节点导入其他配置文件；

整合spring、springMVC中的问题：

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bean会被创建两次。即tomcat启动时，构造器分别被创建了2次；

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实例验证：

目录结构如下图

配置：

web.xml只配置了DispatcherServlet+配置启动spring ioc容器的Listener ，Listener 配置如下：

1 <context-param>
2         <param-name>contextConfigLocation</param-name>
3         <param-value>classpath:beans.xml</param-value>
4     </context-param>
5     <listener>
6         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
7     </listener>

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 4     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
 5     id="WebApp_ID" version="3.1">
 6     <context-param>
 7         <param-name>contextConfigLocation</param-name>
 8         <param-value>classpath:beans.xml</param-value>
 9     </context-param>
10     <listener>
11         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
12     </listener>
13     <servlet>
14         <servlet-name>springDispatcherServlet</servlet-name>
15         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
16         <!-- 配置DispatcherServletd 一个初始化参数：配置springmvc配置文件的位置和名称 -->
17         <!-- 实际上也可以不通过 contextConfigLocation 来配置Springmvc的配置文件，而是用默认的 即默认的配置文件为 
18             /WEB-INF/<servlet-name>-servlet.xml 本项目默认位置配置文件即为： /WEB-INF/springDispatcherServlet-servlet.xml -->
19         <init-param>
20             <param-name>contextConfigLocation</param-name>
21             <param-value>classpath:spring.xml</param-value>
22         </init-param>
23         <!-- 表示springDispatcherServlet在加载的时候被创建 -->
24         <load-on-startup>1</load-on-startup>
25     </servlet>
26 
27     <!-- Map all requests to the DispatcherServlet for handling -->
28     <servlet-mapping>
29         <servlet-name>springDispatcherServlet</servlet-name>
30         <url-pattern>/</url-pattern>
31     </servlet-mapping>
32 </web-app>

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spring.xml基础配置（包扫描的配置、视图解析器配置、<mvc:annotation-driven></mvc:annotation-driven>）

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:mvc="http://www.springframework.org/schema/mvc"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
 7         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 8         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 9 
10     <!-- 配置需要扫描的包 -->
11     <context:component-scan base-package="springandspringmvc">
12     </context:component-scan>
13     <!-- 配置视图解析器 如何把handler 方法返回值解析为实际的物理视图 -->
14     <bean
15         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
16         <property name="prefix" value="/WEB-INF/views/"></property>
17         <property name="suffix" value=".jsp"></property>
18     </bean>
19 
20     <mvc:annotation-driven></mvc:annotation-driven>    
21 </beans>

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bean.xml

1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4     xmlns:context="http://www.springframework.org/schema/context"
5     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
6         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
7         
8         <context:component-scan base-package="springandspringmvc"></context:component-scan>
9 </beans>

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mvc代码：

HelloController：

 1 package springandspringmvc;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.stereotype.Controller;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 
 7 @Controller
 8 @RequestMapping("/helloworld")
 9 public class HelloController {
10     @Autowired
11     private HelloService helloService;
12 
13     @RequestMapping("list")
14     public String hello() {
15         helloService.hello();
16         System.out.println("success");
17         return "success";
18     }
19 
20     public HelloController() {
21         System.out.println("controller constructor");
22     }
23 
24 }

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HelloService.java

1 package springandspringmvc;
2 
3 public interface HelloService {
4 
5     String hello();
6 
7 }

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HelloServiceImpl.java

 1 package springandspringmvc;
 2 
 3 import org.springframework.stereotype.Service;
 4 
 5 @Service("helloService")
 6 public class HelloServiceImpl implements HelloService {
 7 
 8     @Override
 9     public String hello() {
10         System.out.println("hello HelloServiceImpl");
11         return null;
12     }
13 
14     public HelloServiceImpl() {
15         System.out.println("HelloServiceImpl constructor");
16         // TODO Auto-generated constructor stub
17     }
18 
19 }

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success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 success
11 </body>
12 </html>

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运行结果：

当项目启动时，控制打印了两遍：

controller constructor

HelloServiceImpl constructor

解决办法：

解决方法1：使spring的IOC 容器和springMVC的IOC容器扫描的包有重合的部分
解决方法2：使用exclue-filter和include-filter 子节点来规定只能扫描的注解

采用exclue-filter和include-filter 子节点来规定只能扫描的注解；即spring.xml 扫描包该为只扫描Controller和service；bean.xml除了Controller和service不扫描，其他都扫描；

spring.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:mvc="http://www.springframework.org/schema/mvc"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
 7         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 8         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 9 
10     <!-- 配置需要扫描的包 -->
11     <context:component-scan base-package="springandspringmvc"
12         use-default-filters="false">
13         <context:include-filter type="annotation"
14             expression="org.springframework.stereotype.Controller" />
15         <context:include-filter type="annotation"
16             expression="org.springframework.stereotype.Service" />
17     </context:component-scan>
18     <!-- 配置视图解析器 如何把handler 方法返回值解析为实际的物理视图 -->
19     <bean
20         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
21         <property name="prefix" value="/WEB-INF/views/"></property>
22         <property name="suffix" value=".jsp"></property>
23     </bean>
24 
25     <mvc:annotation-driven></mvc:annotation-driven>
26 </beans>

bean.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 6         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 7 
 8     <context:component-scan
 9         base-package="springandspringmvc"
10         use-default-filters="false">
11         <context:exclude-filter type="annotation"
12             expression="org.springframework.stereotype.Controller" />
13         <context:exclude-filter type="annotation"
14             expression="org.springframework.stereotype.Service" />
15     </context:component-scan>
16 </beans>