SpringMVC学习笔记springmvcSchemabasedconfiguration

Spring MVC 学习笔记 spring mvc Schema-based configuration

Spring mvc 目前支持5个tag&＃xff0c;分别是 mvc:annotation-driven&＃xff0c;mvc:interceptors&＃xff0c;mvc:view-controller, mvc:resources和mvc:default-servlet-handler
mvc:annotation-driven 注册 DefaultAnnotationHandlerMapping 和AnnotationMethodHandlerAdapter两个bean&＃xff0c;及一系列缺省的messageconverter(需要classpath中有相应的lib包的支持。) 相当于以下配置的效果【mvc:annotation-driven的效果就相当于以下的配置】。

<bean
class&＃61;"org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
<property name&＃61;"order" value&＃61;"0" />
bean>

<bean
class&＃61;"org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name&＃61;"webBindingInitializer">
<bean
class&＃61;"org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
<property name&＃61;"validator" ref&＃61;"validator" />
bean>
property>
<property name&＃61;"messageConverters">
<list>
<bean
class&＃61;"org.springframework.http.converter.ByteArrayHttpMessageConverter" />
<bean
class&＃61;"org.springframework.http.converter.StringHttpMessageConverter" />
<bean class&＃61;"org.springframework.http.converter.FormHttpMessageConverter" />
<bean
class&＃61;"org.springframework.http.converter.xml.SourceHttpMessageConverter" />
<bean
class&＃61;"org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
list>
property>
bean>

<bean id&＃61;"validator"
class&＃61;"org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />
<bean id&＃61;"conversion-service"
class&＃61;"org.springframework.format.support.FormattingConversionServiceFactoryBean" />

注意在3.0.5版本中不支持在 mvc:annotation-driven中再注册新的messageconveter,在3.1版本中可以支持&＃xff0c;写法如下

<mvc:annotation-driven>
<mvc:message-converters>
<bean class&＃61;"org.springframework.http.converter.StringHttpMessageConverter" />
<bean
class&＃61;"org.springframework.http.converter.ResourceHttpMessageConverter" />
<bean
class&＃61;"org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
mvc:message-converters>
mvc:annotation-driven>

mvc:interceptors 注册HandlerInterceptors 或 WebRequestInterceptors 拦截器来拦截request请求。例如

<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path&＃61;"/*" />
<bean class&＃61;"net.zhepu.web.interceptor.Testinterceptor" />
mvc:interceptor>
mvc:interceptors>

拦截器实现代码如下

public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception ex)
throws Exception {
log.debug("afterCompletion");
}

&＃64;Override
public void postHandle(HttpServletRequest request,
HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
log.debug("postHandle");
}

&＃64;Override
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
log.debug("preHandle");

log.debug(handler.getClass().getName());
return super.preHandle(request, response, handler);
}

mvc:default-servlet-handler 将spring mvc的DispatcherServlet替换当前web server的缺省的Servlet。这样做的好处是定义spring mvc处理请求时&＃xff0c;不再需要定义*.do,*.action,/action/*之类的url-pattern&＃xff0c;而是可以直接定义为/ &＃xff08;注意不是/*&＃xff0c;/*将匹配所有请求而导致所有jsp和静态内容都无法正常显示&＃xff0c;而/只匹配缺省的servlet&＃xff09;。常见web 容器的default servlet name spring mvc中都能自动识别&＃xff0c;但对于不常见的web 容器或default servlet name 被改写过的&＃xff0c;则需增加参数 default-servlet-name来指定对应的servlet name. 需与一起使用

mvc:view-controller 将指定路径的请求直接转到对应的view上&＃xff0c;而不需要特定的controller来处理请求。例如

<mvc:view-controller path&＃61;"/hello/*" view-name&＃61;"helloWorld"/>

mvc:resources 将指定URL 的匹配模式来访问静态文件&＃xff0c;如

<mvc:resources mapping&＃61;"/js/**" location&＃61;"/WEB-INF/js/" cache-period&＃61;"3600"/>

表示将/WEB-INF/js/目录映射到/js/目录&＃xff0c;cache超时时间为3600秒。则jsp中引用 js/helloWorld.js实际上指向的是 /WEB-INF/js/helloWorld.js.