拦截器的创建

我会带着你远行 2023-10-11 19:52 51阅读 0赞

## 一、定义拦截器 ##

### 1.1、创建Java类继承自WebMvcConfigurerAdapter，并通过@Configruation注解进行标注 ###

![4b9a811d242b4fadbda540b5f529c849.png][]

### 1.2、重写父类addInterceptors方法，创建HandlerInterceptor对象 ###

**此处重写父类的方法要注意方法的对错,这里选错依然可以重写三个方法,容易弄混,需要细心注意**

@Override
        public void addInterceptors(InterceptorRegistry registry) {
            HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {
                /**
                 * 拦截请求的方法
                 */
                @Override
                public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
                    System.out.println("****************");
                    return true; //true=放行；false=拦截（直接大白页）
                }
    
                @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 {
    
                }
            };

### 1.3、在addInterceptors方法中，将HandlerInterceptor对象放到InterceptorRegistry对象中，并通过addPathPatterns方法定义拦截规则 ###

registry.addInterceptor(handlerInterceptor).addPathPatterns("/**"); //拦截一切请求

### 二、全部源代码 ###

package demo.interceptor;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.HandlerAdapter;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @Configuration
    public class MyInterceptor extends WebMvcConfigurerAdapter {
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {
                /**
                 * 拦截请求的方法
                 */
                @Override
                public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
                    System.out.println("****************");
                    return true; //true=放行；false=拦截（直接大白页）
                }
    
                @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 {
    
                }
            };
            registry.addInterceptor(handlerInterceptor).addPathPatterns("/**");
        }
    
    }

[4b9a811d242b4fadbda540b5f529c849.png]: https://img-blog.csdnimg.cn/4b9a811d242b4fadbda540b5f529c849.png