整合Spring和SpringMVC

1.Spring容器和SpringMVC容器的关系

  Spring容器是一个父容器，SpringMVC容器是一个子容器，它继承自Spring容器。因此，在SpringMVC容器中，可以访问到Spring容器中定义的Bean，而在Spring容器中，无法访问SpringMVC容器中定义的Bean。在Web开发中，Controller全部在SpringMVC中扫描，除了Controller之外的Bean，全部在Spring容器中扫描（Service、Dao），按这种方式扫描，扫描完完成后，Controller可以访问到Service。

1. 为什么不全部都在Spring中扫描
     因为处理器映射器只会去SpringMVC中查找到Controller，如果没有，就找不到，不会去Spring中找，这就决定了，Controller必须在SpringMVC中扫描。
2. 为什么不全部在SpringMVC中扫描
     在SSM整合或者Spring+SpringMVC+JdbcTemplate中，可以全部在SpringMVC中扫描，但是，在SSH整合中，这种方式不允许。

最佳实践：

1. Controller在SpringMVC中扫描，视图解析器等在SpringMVC容器中配置
2. Spring中扫描Service、Dao已经其他组件，事务定义、数据源定义都在Spring容器中配置

2.SpringMVC的配置文件

<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.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">  
	  
	<context:component-scan base-package="com.dpb"
		use-default-filters="false">
		<context:include-filter type="annotation"
			expression="org.springframework.stereotype.Controller" />
	context:component-scan>
	<mvc:annotation-driven />
beans>

3.Spring的配置文件

<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.xsd">   
	 
	<context:component-scan base-package="com.dpb"
		use-default-filters="true">
		<context:exclude-filter type="annotation"
			expression="org.springframework.stereotype.Controller" />
	context:component-scan>
beans>

4.web.xml文件中

分别加载spring和SpringMVC的配置

<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_3_0.xsd"
	id="WebApp_ID" version="3.0">
	<display-name>testdisplay-name>
	
	<context-param>
		<param-name>contextConfigLocationparam-name>
		<param-value>classpath:applicationContext.xmlparam-value>
	context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
	listener>
	<servlet>
		<servlet-name>springmvcservlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
		<init-param>
			<param-name>contextConfigLocationparam-name>
			<param-value>classpath:spring-servlet.xmlparam-value>
		init-param>
	servlet>
	<servlet-mapping>
		<servlet-name>springmvcservlet-name>
		<url-pattern>/url-pattern>
	servlet-mapping>
	<filter>
		<filter-name>encodingfilter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
		<init-param>
			<param-name>encodingparam-name>
			<param-value>UTF-8param-value>
		init-param>
		<init-param>
			<param-name>forceRequestEncodingparam-name>
			<param-value>trueparam-value>
		init-param>
		<init-param>
			<param-name>forceResponseEncodingparam-name>
			<param-value>trueparam-value>
		init-param>
	filter>
	<filter-mapping>
		<filter-name>encodingfilter-name>
		<url-pattern>/*url-pattern>
	filter-mapping>
web-app>

5.案例实现

SpringMVC配置文件

<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.xsd">    
	
	
	<context:component-scan base-package="com.dpb"
		use-default-filters="true">
		
		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
	context:component-scan>
	
	
	<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="ds">
		<property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
		<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
		<property name="username" value="pms"/>
		<property name="password" value="pms"/>
	bean>
	
	
	<bean class="org.springframework.jdbc.core.JdbcTemplate" id="jdbcTemplate">
		
		<constructor-arg name="dataSource" ref="ds"/>
	bean>
beans>

Spring配置文件

<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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
		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-4.3.xsd">
	
	<mvc:annotation-driven>mvc:annotation-driven>
	
	<context:component-scan base-package="com.dpb.*">
		
		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	context:component-scan>
beans>

web.xml文件

<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_3_0.xsd"
	id="WebApp_ID" version="3.0">
	<display-name>testdisplay-name>
	<welcome-file-list>
		<welcome-file>index.htmlwelcome-file>
		<welcome-file>index.htmwelcome-file>
		<welcome-file>index.jspwelcome-file>
		<welcome-file>default.htmlwelcome-file>
		<welcome-file>default.htmwelcome-file>
		<welcome-file>default.jspwelcome-file>
	welcome-file-list>

	
	<context-param>
		<param-name>contextConfigLocationparam-name>
		<param-value>classpath:applicationContext.xmlparam-value>
	context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
	listener>

	
	
	<servlet>
		<servlet-name>springmvcservlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
		<init-param>
			<param-name>contextConfigLocationparam-name>
			<param-value>classpath:spring-mvc.xmlparam-value>
		init-param>
	servlet>

	<servlet-mapping>
		<servlet-name>springmvcservlet-name>
		<url-pattern>/url-pattern>
	servlet-mapping>

	
	<servlet-mapping>
		<servlet-name>defaultservlet-name>
		<url-pattern>*.jpgurl-pattern>
	servlet-mapping>
	<servlet-mapping>
		<servlet-name>defaultservlet-name>
		<url-pattern>*.jsurl-pattern>
	servlet-mapping>
	<servlet-mapping>
		<servlet-name>defaultservlet-name>
		<url-pattern>*.cssurl-pattern>
	servlet-mapping>
web-app>

Dao代码

/**
 * 
 * @author dpb【波波烤鸭】
 *
 */
public interface IUserDao {

	public List<User> query();
}

/**
 * dao层实现
 * @author dpb【波波烤鸭】
 *
 */
@Repository
public class UserDaoImpl implements IUserDao {
	
	@Resource
	JdbcTemplate jdbcTemplate;

	@Override
	public List<User> query() {
		String sql = "select * from t_sysuser ";
		return jdbcTemplate.query(sql, new BeanPropertyRowMapper<User>(User.class));
	}
}

Service代码

/**
 * 
 * @author dpb【波波烤鸭】
 *
 */
public interface IUserService {

	public List<User> query();
}

/**
 * 
 * @author dpb【波波烤鸭】
 *
 */
@Service
public class UserServiceImpl implements IUserService {
	
	@Resource
	private IUserDao dao;

	@Override
	public List<User> query() {
		// TODO Auto-generated method stub
		return dao.query();
	}
}

controller代码

/**
 * 案例
 * 
 * @author dpb【波波烤鸭】
 *
 */
@Controller
public class UserController {

	@Resource
	private IUserService userService;
	
	@RequestMapping("/query")
	public String query(Model model){
		List<User> list = userService.query();
		model.addAttribute("list", list);
		return "/user.jsp";
	}
	
}

jsp页面代码

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title heretitle>
head>
<body>

	<c:forEach items="${list }" var="user">
		${user.id }--${user.uname }--${user.nickname }<br>
	c:forEach>
body>
html>

查询结果

案例代码：链接：https://pan.baidu.com/s/1J26hh7FL1s2HuJJnxkUIaw
提取码：l1cs
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