SpringBoot配置拦截器实现过程详解

public class MyInterceptor implements HandlerInterceptor {
    private static final Logger logger = LoggerFactory.getLogger(MyInterceptor.class);
    
    @Override
    public boolean preHandle(httpservletRequest request, HttpServletResponse response, Object handler) throws Exception {
        return false;
    }
    
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }
    
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    }
}

@Configuration
public class MyInterceptorConfig extends WEBmvcConfigurationSupport {
    @Override
    protected void addInterceptors(InterceptorReGIStry registry) {
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
   registry.addResourceHandler("
@Configuration
public class MyInterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface UnInterception {
}

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
    UnInterception unInterception = method.getAnnotation(UnInterception.class);
    if(null != unInterception) {
        logger.info("不需要拦截，可以执行");
        return true;
    }
    // 返回true才会执行方法，返回false不会执行
    return false;
}

@Controller
@RequestMapping("/interceptor")
public class InterceptorController {
    @UnInterception
    @RequestMapping("/test")
    public String test() {
        return "hello";
    }
}

import com.kimmel.course13.annotation.UnInterception;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

public class MyInterceptor implements HandlerInterceptor {
    private static final Logger logger = LoggerFactory.getLogger(MyInterceptor.class);
    
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HandlerMethod handlerMethod = (HandlerMethod) handler;
        Method method = handlerMethod.getMethod();
        String methodName = method.getName();
        // 判断用户有没有登录，一般登录之后的用户都有一个对应的token
        UnInterception unInterception = method.getAnnotation(UnInterception.class);
        String token = request.getParameter("token");
        if (null == token || "".equals(token)) {
            logger.info("用户未登录，没有权限执行{}请登录", methodName);
            return false;
        }
        // 返回true才会执行方法，返回false不会执行
        return true;
    }
    
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerMethod handlerMethod = (HandlerMethod) handler;
        Method method = handlerMethod.getMethod();
        String methodName = method.getName();
        logger.info("已经执行完{}了，但是还没有进入视图渲染", methodName);
    }
    
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        logger.info("视图也渲染完了，此时我可以做一些清理工作了");
    }
}

import com.kimmel.course13.Interceptor.MyInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
@Configuration
public class MyInterceptorConfig extends WebMvcConfigurationSupport {
    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**").addResourceLocations(
                "classpath:/static/");
        registry.addResourceHandler("swagger-ui.html").addResourceLocations(
                "classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**").addResourceLocations(
                "classpath:/META-INF/resources/webjars/");
        super.addResourceHandlers(registry);
    }
}

@Controller
@RequestMapping("/interceptor")
public class InterceptorController {
    @RequestMapping("/test")
    public String test() {
        return "hello";
    }
}