一、前台

1. main.js添加全局参数

import Vue from ‘vue’

// 防止重复提交指令
const preventReClick = Vue.directive(‘preventReClick’, {
          
   
	inserted (el, binding) {
          
   
	el.addEventListener(‘click’, () => {
          
   
		if (!el.disabled) {
          
   
			el.disabled = true
			setTimeout(() => {
          
   
				el.disabled = false
			}, binding.value || 3000)
		}
	})
	}
})
export {
          
    preventReClick }
Vue.use(preventReClick);

2. 在el-button标签中使用v-preventReClick

<el-button v-preventReClick @click="save()">保存</el-button>

二、后台

1. 依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>21.0</version>
        </dependency>

2. 自定义锁注解

import java.lang.annotation.*;

/**
 * 自定义 锁的注解
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface LocalLock {
          
   
    String key() default "";
}

3. 配置类

import com.community.common.model.ErrorCode;
import com.community.manage.model.Public.BoardMessage;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.StringUtils;

import java.lang.reflect.Method;
import java.util.concurrent.TimeUnit;

/**
 * 基于本地缓存
 */
@Aspect
@Configuration
public class LockMethodInterceptor {
          
   
    private static final Cache<String, Object> CACHES = CacheBuilder.newBuilder()
            // 最大缓存 100 个
            .maximumSize(1000)
            // 设置写缓存后 5 秒钟过期
            .expireAfterWrite(20, TimeUnit.SECONDS)
            .build();

    @Around("execution(public * *(..)) && @annotation(LocalLock)")
    public Object interceptor(ProceedingJoinPoint pjp){
          
   
        MethodSignature signature = (MethodSignature) pjp.getSignature();
        Method method = signature.getMethod();
        LocalLock localLock = method.getAnnotation(LocalLock.class); //通过反射拿到注解对象
        String key = getKey(localLock.key(), pjp.getArgs()); // 控制台设置了 key=arg[0},所以只匹配了第一个参数
        if (!StringUtils.isEmpty(key)) {
          
   
            if (CACHES.getIfPresent(key) != null) {
          
   
                return new BoardMessage(ErrorCode.getFail(),"请勿重复请求");
            }
            // 如果是第一次请求,就将 key 当前对象压入缓存中
            CACHES.put(key, key);
        }
        try {
          
   
            return pjp.proceed();
        } catch (Throwable throwable) {
          
   
            throw new RuntimeException("服务器异常");
        } finally {
          
   
            CACHES.invalidate(key);
        }
    }

    /**
     * key 的生成策略,如果想灵活可以写成接口与实现类的方式
     *
     * @param keyExpress 表达式
     * @param args       参数
     * @return 生成的key
     */
    private String getKey(String keyExpress, Object[] args) {
          
   
        for (int i = 0; i < args.length; i++) {
          
   
            keyExpress = keyExpress.replace("arg[" + i + "]", args[i].toString());
        }
        return keyExpress;
    }
}

4. 在controller方法上用@LocalLock

@PostMapping
	@LocalLock(key="arg[0]")
	public BoardMessage saveDepartment(VueDepartment vueDepartment) {
          
   
	}