Spring Boot配置拦截器

在Spring Boot中配置拦截器

1.第一步创建一个类实现HandlerInterceptor

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class IpInterceptor  implements HandlerInterceptor {


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
      
    }

    @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 {
     
}

实现上面三个方法
第一个就是请求进入之前要做的
第二个是请求进入以后
第三个是请求完成以后
在这三个方法中实现具体的操作

2. 再写一个配置类继承WebMvcConfigurerAdapter

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import qcssc.Interceptor.IpInterceptor;

@Configuration
public class InterceptorConfigurer  extends WebMvcConfigurerAdapter {

    @Bean
    public IpInterceptor  ipInterceptor(){
        return new IpInterceptor();
    }
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
       
        //addPathPatterns是要拦截的路径
registry.addInterceptor(ipInterceptor()).addPathPatterns("/cqssc/**");
        super.addInterceptors(registry);
    }

}

这个类中需要注意一下 如果上面的拦截器中用到了依赖注入 就要写这个@Bean的注入 否则会报NPE
以上操作搞定以后拦截器就生效了