提交請求前攔截特點註解
HandlerMethodArgumentResolver的使用
1.自定義註解
@Target({ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface CurrentUser {
String value() default “name”;
}
2.自定義類實現HandlerMethodArgumentResolver的接口
public class CurrentUserMethodArgumentResolver implements HandlerMethodArgumentResolver {
private static final Logger LOGGER= LoggerFactory.getLogger(CurrentUserMethodArgumentResolver.class);
@Override
public boolean supportsParameter(MethodParameter methodParameter) {
if(methodParameter.getParameterType().isAssignableFrom(String.class) && methodParameter.hasParameterAnnotation(CurrentUser.class)){
return true;
}
return false;
}
@Override
public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception {
CurrentUser currentUser = methodParameter.getParameterAnnotation(CurrentUser.class);
Object object = nativeWebRequest.getAttribute(currentUser.value(),NativeWebRequest.SCOPE_SESSION);
if(object == null){
String token = nativeWebRequest.getHeader(“Authorization”);
if(token == null){
token = nativeWebRequest.getParameter(“accessToken”);
}
return “name”;
}
return object;
}
}
3.在xml文件中配置
mvc:annotation-driven
mvc:argument-resolvers
</mvc:argument-resolvers>
</mvc:annotation-driven>
4.在方法中使用
@RequestMapping(value = “test”)
public String binding_date(@CurrentUser String name){
LOGGER.info("========================= " + name);
return “page”;
}