Spring Boot编写拦截器教程实例解析

时间：2021-05-18 09:48:33|栏目：JAVA代码|点击：次

创建一个类并使其实现接口HandlerInterceptor

接口提供了一个请求的三个周期的拦截方法

在controller之前，返回true则放行，false反之,handler包含处理请求的controller类以及其方法

boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
在controller接受请求之后，contorller渲染视图之前，如果发生异常就不执行了,可对ModelAndView操作

void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)
在controller处理全部完成之后,ex参数包含处理期间发生的异常,但仅为未被全局捕获的异常

void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

public class TheInterceptor implements HandlerInterceptor {

  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    System.out.println("preHandle");
    return true;
  }

  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    System.out.println("postHandle");
  }

  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    System.out.println("afterCompletion");
  }
}

编写完成后需要将其注册进处理栈中才会生效, 创建WebMvcConfigurer的实现类

@Configuration
public class WebConfig implements WebMvcConfigurer {
  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(new MyInterceptor())
        // 需要拦截的路径,默认全部拦截
        .addPathPatterns("/test1")
        // 需要排除的路径
        .excludePathPatterns("/test2");
  }
}

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