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Spring4 + Spring MVC + MyBatis 整合思路

1、Spring框架的搭建

这个很简单,只需要web容器中注册org.springframework.web.context.ContextLoaderListener,并指定spring加载配置文件,那么spring容器搭建完成。(当然org.springframework的核心jar包需要引入)

当然为了更加易用支持J2EE应用,一般我们还会加上如下:

Spring监听HTTP请求事件:org.springframework.web.context.request.RequestContextListener

<!-- spring配置文件开始 -->
	<context-param>
		<param-name>contextConfigLocation</param-name><!-- spring配置文件,请根据需要选取 -->
		<param-value>classpath*:webconfig/service-all.xml</param-value>
	</context-param>
	<listener><!-- Spring负责监听web容器启动和关闭的事件 --><!-- Spring ApplicationContext载入 -->
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<listener><!-- Spring监听HTTP请求事件 -->
		<!-- 使spring支持request与session的scope,如: -->
		<!-- <bean id="loginAction" class="com.foo.LoginAction" scope="request"/> -->
		<!-- 使用: -->
		<!-- 1、注解获取:@Autowired HttpServletRequest request; -->
		<!-- 2、java代码:HttpServletRequest request = 
		((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest(); -->
		<!-- 3、直接在参数中传递:public String sayHi(HttpServletRequest request) -->
		<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
	</listener>
	<listener><!-- Spring 刷新Introspector防止内存泄露 -->
		<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
	</listener>
	<filter>
		<filter-name>encodingFilter</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>false</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<!-- spring配置文件结束 -->

2、Spring MVC的搭建

首先我们知道Spring MVC的核心是org.springframework.web.servlet.DispatcherServlet,所以web容器中少不了它的注册。(当然org.springframework的web、mvc包及其依赖jar包需要引入)

<!-- spring mvc配置开始 -->
	<servlet>
		<servlet-name>Spring-MVC</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath*:spring/spring-mvc.xml</param-value><!-- spring mvc配置文件 -->
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>Spring-MVC</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
	<!-- spring mvc配置结束 -->

同时为了更好使用MVC,spring-mvc.xml需要配置以下:

1)(可选)多部分请求解析器(MultipartResolver)配置,与上传文件有关 需要类库commons-io、commons-fileupload

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="utf-8"></property><!-- 默认编码-->
		<property name="maxUploadSize" value="104857600"></property><!-- 文件大小最大值-->
		<property name="maxInMemorySize" value="40960"></property><!-- 内存中的最大值-->
	</bean>

2)(可选)本地化(LocaleResolver)配置

3)(可选)主题解析器(ThemeResolver)配置

4)(必选)处理器映射器(HandlerMapping)配置,可以配置多个,一般采用RequestMappingHandlerMapping或者自定义

这里我们自定义了一个处理器映射器,继承重写RequestMappingHandlerMapping,支持@RequestMapping无需任何path参数自动装载类名或方法作为url路径匹配。

<bean id="handlerMapping" 
		class="io.flysium.framework.web.servlet.mvc.method.annotation.CustomHandlerMapping">
		<property name="order" value="-1" />
	</bean>

CustomHandlerMapping实现:

@Override
	protected RequestMappingInfo getMappingForMethod(Method method, Class handlerType) {
		RequestMappingInfo info = createRequestMappingInfoDefault(method);
		if (info != null) {
			RequestMappingInfo typeInfo = createRequestMappingInfoDefault(handlerType);
			if (typeInfo != null)
				info = typeInfo.combine(info);
		}
		return info;
	}

	private RequestMappingInfo createRequestMappingInfoDefault(AnnotatedElement element) {
		RequestMapping requestMapping = AnnotatedElementUtils.findMergedAnnotation(element,
				RequestMapping.class);
		RequestCondition condition = (element instanceof Class)
				? getCustomTypeCondition((Class) element)
				: getCustomMethodCondition((Method) element);
		/**
		* 以类名和方法名映射请求,参照@RequestMapping
		* 默认不需要添加任何参数(如:/className/methodName.do)
		*/
		String defaultName = (element instanceof Class)
				? ((Class) element).getSimpleName()
				: ((Method) element).getName();
		return requestMapping == null
				? null
				: createRequestMappingInfo(requestMapping, condition, defaultName);
	}

	protected RequestMappingInfo createRequestMappingInfo(RequestMapping annotation,
			RequestCondition<?> customCondition, String defaultName) {
		String[] patterns = resolveEmbeddedValuesInPatterns(annotation.value());
		if (patterns != null && (patterns.length == 0)) {
			patterns = new String[]{defaultName};
		}
		return new RequestMappingInfo(
				new PatternsRequestCondition(patterns, getUrlPathHelper(), getPathMatcher(),
						this.useSuffixPatternMatch, this.useTrailingSlashMatch,
						this.fileExtensions),
				new RequestMethodsRequestCondition(annotation.method()),
				new ParamsRequestCondition(annotation.params()),
				new HeadersRequestCondition(annotation.headers()),
				new ConsumesRequestCondition(annotation.consumes(), annotation.headers()),
				new ProducesRequestCondition(annotation.produces(), annotation.headers(),
						this.contentNegotiationManager),
				customCondition);
	}

5)(必选)处理器适配器(HandlerAdapter)配置,可以配置多个,主要是配置messageConverters,其主要作用是映射前台传参与handler处理方法参数。一般扩展RequestMappingHandlerAdapter,或者自定义。如果我们需要json请求的处理,这里必须扩展。同时我们需要注意的是日期格式的转换。

另外Spring 4.2新特性,加之注解会自动注入@ControllerAdvice,可以定义RequestBodyAdvice、ResponseBodyAdvice,可以更方便地在参数处理方面着手自定义。

<bean id="handlerAdapter"
	class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
	<property name="order" value="-1" />
	<property name="messageConverters">
		<list>
		<!-- <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" 
			/> -->
			<ref bean="mappingJacksonHttpMessageConverter" />
		</list>
	</property>
	<property name="webBindingInitializer">
		<bean
			class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
			<property name="conversionService">
				<!-- 针对普通请求(非application/json) 前台的日期字符串与后台的Java Date对象转化,
				此情况,应使用spring 
					mvc本身的内置日期处理 -->
				<!-- 可以在VO属性上加注解:@DateTimeFormat 需要类库joda-time -->
		<bean
		class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
		</bean>
			</property>
		</bean>
	</property>
</bean>
<!-- json请求(application/json)返回值Date转String,全局配置 -->
<bean name="jacksonObjectMapper"
	class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
	<property name="featuresToDisable">
		<array>
		<util:constant
static-field="com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS" />
		</array>
	</property>
	<!-- 如果想自定义,可以在VO属性上加注解:@JsonFormat(shape = JsonFormat.Shape.STRING, pattern 
		= Consts.DATE_PATTERN.DATE_PATTERN_OBLIQUE,timezone = "GMT+8") -->
	<property name="simpleDateFormat">
		<value>yyyy-MM-dd HH:mm:ss</value>
	</property>
</bean>
<!--避免IE执行Ajax时,返回JSON出现下载文件 -->
<!-- 自定义 -->
<bean id="mappingJacksonHttpMessageConverter"
	class="io.flysium.framework.http.converter.json.CustomJackson2HttpMessageConverter">
	<property name="objectMapper" ref="jacksonObjectMapper" />
	<property name="supportedMediaTypes">
		<list>
			<value>text/html;charset=UTF-8</value>
			<value>application/json;charset=UTF-8</value>
		</list>
	</property>
</bean>

6)(可选)处理器异常解析器(HandlerExceptionResolver)配置,可以配置多个,配置Controller异常抛出后,我们是怎么样处理的,一般需要日志或做反馈的可以自定义。

7)(可选)请求到视图名翻译器(RequestToViewNameTranslator)配置,RequestToViewNameTranslator可以在处理器返回的View为空时使用它根据Request获得viewName。

8)(可选)视图解析器(ViewResolver)配置,可以配置多个,定义跳转的文件的前后缀 ,视图模式配置,主要针对@Controller返回ModelAndView的视图路径解析,动给后面控制器的方法return的字符串 加上前缀和后缀,变成一个 可用的url地址 。

<bean id="viewResolver"
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/" />
		<property name="suffix" value=".jsp" />
		<property name="viewClass"
			value="org.springframework.web.servlet.view.JstlView" />
	</bean>

最后给Controller加入组件扫描吧,这样减少xml配置,直接在Java代码中加入注解即可。

<!-- 自动扫描类包,将标志Spring注解的类自动转化为Bean,同时完成Bean的注入 -->
	<!-- 扫描控制器 -->
	<context:component-scan base-package="io.flysium" 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.RestController" />
		<context:include-filter type="annotation" 
			expression="org.springframework.web.bind.annotation.ControllerAdvice" />
	</context:component-scan>

3、Mybatis整合

整合mybatis到Spring框架,我们需要mybatis的jar包,及mybatis-spring整合jar包。然后在Spring容器中注册配置org.mybatis.spring.SqlSessionFactoryBean(需要数据源,及指定Mybatis配置文件)及org.mybatis.spring.SqlSessionTemplate即可。

更多整合请参照Git项目:https://git.oschina.net/svenaugustus/app-ss4m-less

目前除了ssm,另外整合redis(支持切换单节点配置、主从哨兵配置,集群配置)、spring session方案。

其中包括spring MVC的简单demo,用于学习交流。

原文  http://www.importnew.com/26640.html
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