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

    

        contextConfigLocation

        classpath*:webconfig/service-all.xml

    

    

        org.springframework.web.context.ContextLoaderListener

    

    

        

        

        

        

        

        

        org.springframework.web.context.request.RequestContextListener

    

    

        org.springframework.web.util.IntrospectorCleanupListener

    

    

        encodingFilter

        org.springframework.web.filter.CharacterEncodingFilter

        

            encoding

            UTF-8

        

        

            forceEncoding

            false

        

    

    

        encodingFilter

        /*

    

    

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

        org.springframework.web.servlet.DispatcherServlet

        

            contextConfigLocation

            classpath*:spring/spring-mvc.xml

        

        1

    

    

        Spring-MVC

        *.do

    

    

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

        

        

        

    

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。

        class="io.flysium.framework.web.servlet.mvc.method.annotation.CustomHandlerMapping">

        

    

CustomHandlerMapping实现:

@Override

    protectedRequestMappingInfo getMappingForMethod(Method method, Class handlerType) {

        RequestMappingInfo info = createRequestMappingInfoDefault(method);

        if(info != null) {

            RequestMappingInfo typeInfo = createRequestMappingInfoDefault(handlerType);

            if(typeInfo != null)

                info = typeInfo.combine(info);

        }

        returninfo;

    }


    privateRequestMappingInfo createRequestMappingInfoDefault(AnnotatedElement element) {

        RequestMapping requestMapping = AnnotatedElementUtils.findMergedAnnotation(element,

                RequestMapping.class);

        RequestCondition condition = (element instanceofClass)

                ? 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 instanceofClass)

                ? ((Class) element).getSimpleName()

                : ((Method) element).getName();

        returnrequestMapping == null

                ? null

                : createRequestMappingInfo(requestMapping, condition, defaultName);

    }


    protectedRequestMappingInfo createRequestMappingInfo(RequestMapping annotation,

            RequestCondition customCondition, String defaultName) {

        String[] patterns = resolveEmbeddedValuesInPatterns(annotation.value());

        if(patterns != null&& (patterns.length == 0)) {

            patterns = newString[]{defaultName};

        }

        returnnewRequestMappingInfo(

                newPatternsRequestCondition(patterns, getUrlPathHelper(), getPathMatcher(),

                        this.useSuffixPatternMatch, this.useTrailingSlashMatch,

                        this.fileExtensions),

                newRequestMethodsRequestCondition(annotation.method()),

                newParamsRequestCondition(annotation.params()),

                newHeadersRequestCondition(annotation.headers()),

                newConsumesRequestCondition(annotation.consumes(), annotation.headers()),

                newProducesRequestCondition(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。

    class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">

    

    

        

        

            

        

    

    

        

            class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">

            

                

                

        

        class="org.springframework.format.support.FormattingConversionServiceFactoryBean">

        

            

        

    

    class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">

    

        

        

static-field="com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS"/>

        

    

    

    

        yyyy-MM-dd HH:mm:ss

    

    class="io.flysium.framework.http.converter.json.CustomJackson2HttpMessageConverter">

    

    

        

            text/html;charset=UTF-8

            application/json;charset=UTF-8

        

    

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 。

        class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        

        

        

            value="org.springframework.web.servlet.view.JstlView"/>

    

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。

    

        expression="org.springframework.stereotype.Controller"/>

    

        expression="org.springframework.web.bind.annotation.RestController"/>

    

        expression="org.springframework.web.bind.annotation.ControllerAdvice"/>

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。

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