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

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<!-- 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）

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<!-- 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

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<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。

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

CustomHandlerMapping实现：

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@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。

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<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 。

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<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。

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<!-- 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。