springboot学习五--自定义拦截器_springboot5 定义拦截器-优快云博客

本文详细介绍如何在Spring MVC中创建自定义拦截器，通过继承WebMvcConfigurerAdapter并重写其方法来实现。示例代码展示了拦截器的预处理、后处理及完成处理的逻辑，同时介绍了如何在启动类中配置拦截器的包扫描。

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一，自定义拦截器
继承WebMvcConfigurerAdapter ，然后重写父类方法

@Configuration //声明这是一个配置
public class MyInterceptor extends WebMvcConfigurerAdapter {
	public void addInterceptors(InterceptorRegistry registry) {
		HandlerInterceptor inter = new HandlerInterceptor() {
			public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
				System.out.println("自定义拦截器preHandle----------");
				return true;
			}
			public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
					throws Exception {
				System.out.println("自定义拦截器postHandle----------");
			}
			public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
					throws Exception {
				System.out.println("自定义拦截器afterCompletion----------");				
			}
		};
		registry.addInterceptor(inter).addPathPatterns("/**");
	}
}

启动类，配置拦截器包扫描

@SpringBootApplication(scanBasePackages= {"com.yu.controller","com.yu.interceptor"}) //组合注解
public class Application {
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
}

测试

@EnableAutoConfiguration //启用自动配置
@Controller
public class TestController {
	@RequestMapping("/hello")
	@ResponseBody
	public String requestHello() {
		return "你好";
	}
}