在前后端分离的情况下,最重要的组件是HandlerMapping + HandlerAdapter + HandlerExceptionResolver
- MultipartResolver(内容类型(Content-type:multipart)的请求解析器接口)
public interface MultipartResolver {
/**
* 是否为multipart请求
*/
boolean isMultipart(HttpServletRequest request);
/**
* 将HttpServletRequest转化为MultipartHttpServletRequest
*/
MultipartHttpServletRequest resolveMultipart(HttpServletRequest request) throws MultipartException;
/**
* 清除处理multipart产生的资源 比如资源文件
*/
void cleanupMultipart(MultiHttpServletRequest request);
}
- LocaleResolver(本地(国际化)解析器接口))
public interface LocaleResolver {
/**
* 从请求中解析出要用的语言. 比如请求头中的"Accept-Language"
*/
Locale resolveLocale(HttpServletRequest request);
/**
* 设置请求所使用的语言
*/
void setLocale(HttpServletRequest request, @Nullable HttpServletResponse response, @Nullable Locale locale);
}
3.ThemeResolver(主体解析器接口)
public interface ThemeResolver {
/**
* 从请求中解析出使用的主题,从请求头中的"User-Agent"判断使用的是PC端还是手机端
*/
String resolveThemeName(HttpServletRequest request);
/**
* 设置请求所使用的主题
*/
void setThemeName(HttpServletRequest request, @Nullable HttpServletResponse response, @Nullable String themeName);
}
4.HandlerMapping(处理器匹配接口,根据请求获得其处理器(handler)和拦截器(HandlerInterceptor数组))
public interface HandlerMapping {
String BEST_MATCHING_HANDLER_ATTRIBUTE = HandlerMapping.class.getName() + ".bestMatchingHandler";
String LOOKUP_PATH = HandlerMapping.class.getName() + ".lookupPath";
String PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE = HandlerMapping.class.getName() + ".pathWithinHandlerMapping";
String BEST_MATCHING_PATTERN_ATTRIBUTE = HandlerMapping.class.getName() + ".bestMatchingPattern";
String INTROSPECT_TYPE_LEVEL_MAPPING = HandlerMapping.class.getName() + ".introspectTypeLevelMapping";
String URI_TEMPLATE_VARIABLES_ATTRIBUTE = HandlerMapping.class.getName() + ".uriTemplateVariables";
String MATRIX_VARIABLES_ATTRIBUTE = HandlerMapping.class.getName() + ".matrixVariables";
String PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE = HandlerMapping.class.getName() + ".producibleMediaTypes";
@Nullable
HandlerExcutionChain getHandler(HttpServletRequest request) throws Exception;
}
5.HandlerAdapter(处理器适配器接口)
public interface HandlerAdapter {
/**
* 是否支持该处理器
*/
boolean supports(Object handler);
/**
* 执行处理器 返回ModelAndView结果
*/
@Nullable
ModelAndView handle(HttpServletReqeust request, HttpServletResponse response, Object handler) throws Exception;
/**
* 返回请求的最新更新时间 如果不支持此操作 则返回-1
*/
long getLastModified(HttpServletRequest request, Object handler);
}
6.HandlerExceptionResolver(处理器异常解析接口,将处理器执行时的异常转换为对应的结果)
public interface HandlerExceptionResolver {
@Nullable
ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, @Nullable Object handler, Exception ex);
}
7.RequestToViewNameTranslator(请求到视图名的转换器接口)
public interface RequestToViewNameTranslator {
/**
* 请求到视图名的转换接口
*/
@Nullable
String getViewName(HttpServletRequest request) throws Exception;
}
8.ViewResolver(实体解析接口, 根据视图名和本地化获取最终的View对象)
public interface ViewResolver {
/**
* 根据视图名和本地化获得最终的View对象
*/
@Nullable
View resoleViewName(String viewName, Locale locale) throws Exception;
}
9.FlashMapManager(FlashMap管理接口, 负责重定向, 保存参数到临时存储中)
public interface FlashMapManager {
/**
* 恢复参数 并将恢复过的和超时的参数从保存介质中删去
*/
@Nullable
FlashMap retrieveAndUpdate(HttpServletRequest request, HttpServletResponse response);
/**
* 将参数保存起来
*/
void saveOutputFlashMap(FlashMap flashMap, HttpServletRequest request, HttpServletResponse response);
}
