How to use Java's SpringMVC interceptor
May 13, 2023 pm 02:55 PM
The role of interceptor
Spring MVC's interceptor is similar to the filter in Servlet development, and is used for preprocessing and postprocessing of the processor. Interceptors are connected into a chain in a certain order. This chain is called Interceptor Chain. When an intercepted method or field is accessed, the interceptors in the interceptor chain will be called in the order they were previously defined. Interceptors are also the specific implementation of AOP ideas.
The difference between interceptor and filter
| The difference | Filter | Intercepter |
| Scope of use | is part of the servlet specification and can be used by any Java Web project | is the SpringMVC framework's own, only if SpringMVC is used Only framework projects can use |
| Interception range | After configuring /* in the url-pattern, ???????????????????????????????????????????????????????? can intercept all resources to be accessed | After configuring /** in |
Interceptor Quick Start
Customized interception steps:
① Create an interceptor class to implement the HandlerInterceptor interface
public?class?MyHandlerInterceptor1?implements?HandlerInterceptor?{
????public?boolean?preHandle(HttpServletRequest?request,?HttpServletResponse?response,?Object?handler)?{
????????System.out.println("preHandle?running...");
????????return?true;
????}
????public?void?postHandle(HttpServletRequest?request,?HttpServletResponse?
????????response,?Object?handler,?ModelAndView?modelAndView)?{
????????System.out.println("postHandle?running...");
????}
????public?void?afterCompletion(HttpServletRequest?request,?HttpServletResponse?
????????response,?Object?handler,?Exception?ex)?{
????????System.out.println("afterCompletion?running...");
????}?
}
② Configure the interceptor
<!--配置攔截器-->? <interceptors> ?<interceptor> ??<mapping></mapping> ??<bean></bean> ?</interceptor> </interceptors>
③ Test the interception effect of the interceptor (write the target method)
@RequestMapping("/quick23")?
@ResponseBody
public?ModelAndView?quickMethod23()?throws?IOException,?ParseException?{
????System.out.println("目標(biāo)方法執(zhí)行....");
????ModelAndView?modelAndView?=?new?ModelAndView();
????modelAndView.addObject("name","modelname");
????modelAndView.setViewName("index");
????return?modelAndView;
}
(Access URL)
http ://localhost:8080/project/quick23
Console printing results
Multiple interceptor operations
The steps are the same as above , before writing a MyHandlerInterceptor2 operation, just test the execution sequence.
Interceptor method description
| Description | |
| The method will be called before request processing. The return value of this method is of Boolean type. When it returns false, it means that the request is over. Subsequent Interceptor and Controller will not be executed again; when it returns When the value is true, the preHandle method of the next Interceptor will continue to be called. | |
| This method is called after the current request is processed, provided that The return value of the preHandle method can only be called when it is true, and it will be called before the DispatcherServlet returns the view for rendering, so we can operate the ModelAndView object after the Controller is processed in this method | |
| This method will be executed after the entire request is completed, that is, after DispatcherServlet renders the corresponding view. The premise is that the return value of the preHandle method is true before it can be called. |
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