Spring MVC 指导文档解读(二)
Special Bean Types In the WebApplicationContext
解读
1.WebApplicationContext 特有的几种 Bean Types
2. 也表明 与之相对的 还有 ApplicationContext
下面这几种特有的 web bean types 也理应定义到 web 的上下文配置文件中,比如 a-servlet.xml
Table 22.1. Special bean types in the WebApplicationContext
Bean type | Explanation |
---|---|
Maps incoming requests to handlers and a list of pre- and post-processors (handler interceptors) based on some criteria the details of which vary by |
|
HandlerAdapter |
Helps the |
Maps exceptions to views also allowing for more complex exception handling code. |
|
Resolves logical String-based view names to actual |
|
Resolves the locale a client is using and possibly their time zone, in order to be able to offer internationalized views |
|
Resolves themes your web application can use, for example, to offer personalized layouts |
|
Parses multi-part requests for example to support processing file uploads from HTML forms. |
|
Stores and retrieves the "input" and the "output" |
查看dispatcherServlet 相关日志
Line 2: 2016-10-04 13:07:57 DEBUG DispatcherServlet:118 - Initializing servlet 'dispatcher'
Line 9: 2016-10-04 13:07:57 INFO DispatcherServlet:489 - FrameworkServlet 'dispatcher': initialization started
Line 10: 2016-10-04 13:07:57 DEBUG DispatcherServlet:617 - Servlet with name 'dispatcher' will try to create custom WebApplicationContext context of class 'org.springframework.web.context.support.XmlWebApplicationContext', using parent context [null]
Line 577: 2016-10-04 13:07:59 DEBUG DispatcherServlet:511 - Unable to locate MultipartResolver with name 'multipartResolver': no multipart request handling provided
Line 586: 2016-10-04 13:07:59 DEBUG DispatcherServlet:533 - Unable to locate LocaleResolver with name 'localeResolver': using default [org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver@3af54caa]
Line 594: 2016-10-04 13:07:59 DEBUG DispatcherServlet:555 - Unable to locate ThemeResolver with name 'themeResolver': using default [org.springframework.web.servlet.theme.FixedThemeResolver@1508dd9]
Line 619: 2016-10-04 13:07:59 DEBUG DispatcherServlet:692 - Unable to locate RequestToViewNameTranslator with name 'viewNameTranslator': using default [org.springframework.web.servlet.view.DefaultRequestToViewNameTranslator@4a233666]
Line 629: 2016-10-04 13:07:59 DEBUG DispatcherServlet:753 - Unable to locate FlashMapManager with name 'flashMapManager': using default [org.springframework.web.servlet.support.SessionFlashMapManager@2c267a73]
Line 643: 2016-10-04 13:07:59 DEBUG DispatcherServlet:568 - Published WebApplicationContext of servlet 'dispatcher' as ServletContext attribute with name [org.springframework.web.servlet.FrameworkServlet.CONTEXT.dispatcher]
Line 644: 2016-10-04 13:07:59 INFO DispatcherServlet:508 - FrameworkServlet 'dispatcher': initialization completed in 1538 ms
Line 645: 2016-10-04 13:07:59 DEBUG DispatcherServlet:139 - Servlet 'dispatcher' configured successfully
dispatcherServlet 干了什么
1. 设置默认的策略(位于DispatcherServlet.properties 中)
static {
// Load default strategy implementations from properties file.
// This is currently strictly internal and not meant to be customized
// by application developers.
try {
ClassPathResource resource = new ClassPathResource(DEFAULT_STRATEGIES_PATH, DispatcherServlet.class);
defaultStrategies = PropertiesLoaderUtils.loadProperties(resource);
}
catch (IOException ex) {
throw new IllegalStateException("Could not load 'DispatcherServlet.properties': " + ex.getMessage());
}
}
# Default implementation classes for DispatcherServlet's strategy interfaces.
# Used as fallback when no matching beans are found in the DispatcherServlet context.
# Not meant to be customized by application developers. org.springframework.web.servlet.LocaleResolver=org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver org.springframework.web.servlet.ThemeResolver=org.springframework.web.servlet.theme.FixedThemeResolver org.springframework.web.servlet.HandlerMapping=org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping,\
org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping org.springframework.web.servlet.HandlerAdapter=org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter,\
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter,\
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter org.springframework.web.servlet.HandlerExceptionResolver=org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver,\
org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver,\
org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver org.springframework.web.servlet.RequestToViewNameTranslator=org.springframework.web.servlet.view.DefaultRequestToViewNameTranslator org.springframework.web.servlet.ViewResolver=org.springframework.web.servlet.view.InternalResourceViewResolver
DispatcherServlet.properties
2. 初始化
protected void initStrategies(ApplicationContext context) {
initMultipartResolver(context);
initLocaleResolver(context);
initThemeResolver(context);
initHandlerMappings(context);
initHandlerAdapters(context);
initHandlerExceptionResolvers(context);
initRequestToViewNameTranslator(context);
initViewResolvers(context);
}
举例来说就是存在指定的就用指定的,不存在指定的就用默认的
private void initRequestToViewNameTranslator(ApplicationContext context) {
try {
this.viewNameTranslator =
context.getBean(REQUEST_TO_VIEW_NAME_TRANSLATOR_BEAN_NAME, RequestToViewNameTranslator.class);
if (logger.isDebugEnabled()) {
logger.debug("Using RequestToViewNameTranslator [" + this.viewNameTranslator + "]");
}
}
catch (NoSuchBeanDefinitionException ex) {
// We need to use the default.
this.viewNameTranslator = getDefaultStrategy(context, RequestToViewNameTranslator.class);
if (logger.isDebugEnabled()) {
logger.debug("Unable to locate RequestToViewNameTranslator with name '" +
REQUEST_TO_VIEW_NAME_TRANSLATOR_BEAN_NAME + "': using default [" + this.viewNameTranslator +
"]");
}
}
}
这便是上面的日志的原因
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