【继承HandlerInterceptorAdapter类实现拦截器】

最新推荐文章于 2025-03-06 11:48:31 发布

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本文介绍了如何在Spring MVC中创建一个重复提交拦截器，通过继承HandlerInterceptorAdapter并重写preHandle方法来阻止重复提交。在preHandle方法中检查请求是否带有特定注解，如果存在则判断是否为重复提交并返回错误信息。此外，还覆盖了afterCompletion方法，确保请求完成后执行某些操作。最后，通过WebMvcConfigurer接口将拦截器添加到系统中，设置拦截所有请求。

一、继承HandlerInterceptorAdapter类，重写preHandle方法。每次请求先进入该方法

@Component
public abstract class RepeatSubmitInterceptor extends HandlerInterceptorAdapter
{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
    {
        if (handler instanceof HandlerMethod)
        {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            Method method = handlerMethod.getMethod();
            RepeatSubmit annotation = method.getAnnotation(RepeatSubmit.class);
            if (annotation != null)
            {
                if (this.isRepeatSubmit(request))
                {
                    AjaxResult ajaxResult = AjaxResult.error("不允许重复提交，请稍后再试");
                    ServletUtils.renderString(response, JSON.marshal(ajaxResult));
                    return false;
                }
            }
            return true;
        }
        else
        {
            return super.preHandle(request, response, handler);
        }
    }


}

二、重写afterCompletion方法，每次请求完成后，进入该方法

@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
			@Nullable Exception ex) throws Exception {
	}

三、将拦截器注入系统中

package com.ruoyi.framework.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
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.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.framework.interceptor.RepeatSubmitInterceptor;

/**
 * 通用配置
 * 
 * @author ruoyi
 */
@Configuration
public class ResourcesConfig implements WebMvcConfigurer
{
    /**
     * 首页地址
     */
    @Value("${shiro.user.indexUrl}")
    private String indexUrl;

    @Autowired
    private RepeatSubmitInterceptor repeatSubmitInterceptor;

    /**
     * 默认首页的设置，当输入域名是可以自动跳转到默认指定的网页
     */
    @Override
    public void addViewControllers(ViewControllerRegistry registry)
    {
        registry.addViewController("/").setViewName("forward:" + indexUrl);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry)
    {
        /** 本地文件上传路径 */
        registry.addResourceHandler(Constants.RESOURCE_PREFIX + "/**").addResourceLocations("file:" + RuoYiConfig.getProfile() + "/");

        /** swagger配置 */
        registry.addResourceHandler("/swagger-ui/**").addResourceLocations("classpath:/META-INF/resources/webjars/springfox-swagger-ui/");
    }

    /**
     * 自定义拦截规则
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry)
    {
        registry.addInterceptor(repeatSubmitInterceptor).addPathPatterns("/**");
    }
}