The springboot interceptor is invalid. The difference between setting pathpatterns to / * and / * *

osc_ 00198362 2021-01-21 09:13:44
springboot interceptor invalid. invalid difference


Problem description : In today's springboot A filter and interceptor have been added to the project , Then access the interface in the project , It is found that this interface will be filtered by the filter , But it won't be intercepted by interceptors .

First, let's look at how filters and interceptors are defined :

One 、 Define filters

1) Customize a class implementation javax.servlet.Filter Interface

public class CustomFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println(" Custom filter initialization ");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println(" The filter starts execution ");
filterChain.doFilter(servletRequest, servletResponse);
System.out.println(" End of filter execution ");
}
@Override
public void destroy() {
System.out.println(" Custom filter destruction ");
}
}

2) Define a configuration class , Register filter to spring In the container

@Configuration
public class FilterConfiguration {
@Bean
public FilterRegistrationBean setFilterBean()
{
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new CustomFilter());
filterRegistrationBean.setName("oneFilter");
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.setOrder(10);
return filterRegistrationBean;
}
}

Two 、 Define interceptors

1) Customize a class implementation org.springframework.web.servlet.HandlerInterceptor Interface

    The interceptor is spring Framework defined , Add here @Component annotation , Give Way spring Container management bean Life cycle of

@Component
public class MyInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println(" perform controller Method before entering the interceptor ");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("controller After the method is executed, it enters the interceptor ");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println(" After rendering the view, enter the interceptor ");
}
}

2) Define a configuration class , Register interceptors

      Here through @Resource Annotations can get instance objects .

@Configuration
public class InterceptorConfiguration implements WebMvcConfigurer {
@Resource
private MyInterceptor myInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry)
{
registry.addInterceptor(myInterceptor).addPathPatterns("/*");
}
}

3、 ... and 、 Test and find problems

thus , Filters and interceptors are already defined , Pass below postman Access an interface in a program , The interface address is : http://localhost:8080/v1/articles/1 , The console prints as follows :

Check the print on the console , Found that the program did not enter the custom interceptor , Looking back at the code , The filter UrlPatterns by /*, The interceptor PathPatterns Also for the /*, It looks like the filter caught this interface , And interceptors don't have , Later, by consulting information , I have seen the post saying It's going to take the interceptor's PathPatterns Set to /**, So try calling the interface again , The console prints as follows :

At this point, the program enters the interceptor , The expected results are obtained .

The analysis of this problem is as follows :

/* Is to block all the folders , But not including subfolders , Can be interpreted as /* There's only one layer of address behind
/** Is to block all the folders and all their subfolders , Can be interpreted as /** It's followed by a multi tier address 

The address of the interface we visited is http://localhost:8080/v1/articles/1, There are multiple paths behind , All to use /** To intercept .

remaining problems : Filter pass /* You can filter this interface , And interceptors don't work , What's the difference between the two ?

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https://javamana.com/2021/01/20210121091210348o.html

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