springmvc防止重复提交拦截器

一、拦截器实现，ResubmitInterceptorHandler.java

import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Map;
import java.util.Set;

/**
 * 重复请求阻止拦截器
 */
@Component("resubmitInterceptorHandler")
public class ResubmitInterceptorHandler extends HandlerInterceptorAdapter {

    private RedisUtils redisUtils;//自定义

    public ResubmitInterceptorHandler(RedisUtils redisUtils) {
        this.redisUtils = redisUtils;
    }

    /**
     * 拦截重复提交的请求
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HandlerMethod method = (HandlerMethod) handler;
        Resubmit resubmit = method.getMethodAnnotation(Resubmit.class);
        if (resubmit == null) {
            return true;
        } else {
            Long seconds = resubmit.seconds();
            // 获取重复提交的键值
            String key = getKey(request, method);
            String value = redisUtils.get(key, String.class);
            if (StringUtils.isBlank(value)) {
                // 如果存在就存储到redis中
                redisUtils.set(key, seconds.toString(), seconds);
                return true;
            } else {
                throw new Exception("请不要在" + seconds + "秒内重复请求");
            }
        }
    }

    /**
     * 获取redis存储的键
     *
     * @param request
     * @param method
     * @return
     */
    private String getKey(HttpServletRequest request, HandlerMethod method) {
        StringBuffer sb = new StringBuffer();
        String requestURI = request.getRequestURI();
        // 拼接请求路径
        sb.append(requestURI);
        Method targetMethod = method.getMethod();
        // 拼接目标方法名称
        sb.append(targetMethod.getName());
        Map<String, String[]> parameterMap = request.getParameterMap();
        if (parameterMap != null) {
            Set<Map.Entry<String, String[]>> entries = parameterMap.entrySet();
            if (entries != null) {
                for (Map.Entry<String, String[]> entry : entries) {
                    sb.append(entry.getKey()).append(Arrays.toString(entry.getValue()));
                }
            }
        }
        return sb.toString();
    }
}

二、controller上要添加的注解

import java.lang.annotation.*;

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Resubmit {

    long value() default 0;

    /**
     * 指定多少时间以内不能重复提交
     * -1 表示不进行处理
     *
     * @return
     */
    long seconds();
}

三、拦截器配置

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
@Import(com.bqmart.utils.RedisUtils.class)
public class InterceptorConfig extends WebMvcConfigurerAdapter {

    @Autowired
    private xxx.RedisUtils redisUtils;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(validateInterceptorHandler()).addPathPatterns("/**");
    }

    @Bean
    public com.bqmart.interceptor.ResubmitInterceptorHandler resubmitInterceptorHandler() {
        return new ResubmitInterceptorHandler(redisUtils);
    }

}