AOP防止连续点击新增接口

防止连续点击的实现方式有很多种,比如,在所有的onclick里面加上防多次点击的代码,或者定义一个新的OnClickListener,在里面加上防多次点击的代码,然后项目中的所有OnClickListener都用这个listener,当然还有一些其他的方式,这里将介绍一种新的方式来实现,那就是aop。

实现原理:

自定义防止重复提交标记(@AvoidRepeatableCommit)。
对需要防止重复提交的Congtroller里的mapping方法加上该注解。
新增Aspect切入点,为@AvoidRepeatableCommit加入切入点。
每次提交表单时,Aspect都会保存当前key到reids(须设置过期时间)。
重复提交时Aspect会判断当前redis是否有该key,若有则拦截。

第一步:引入依赖

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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
 </dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

第二步:添加自定义注解

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package com.legendenergy.annotation;
 
import java.lang.annotation.*;
 
/**
 * 避免重复提交
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface AvoidRepeatableCommit {
 
    /**
     * 指定时间内不可重复提交,单位毫秒
     *
     * @return
     */
    long timeout() default 30000;
 
}

 第三步:添加切面类

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package com.legendenergy.annotation;
 
import com.legendenergy.common.core.domain.AjaxResult;
import com.legendenergy.common.utils.ip.IpUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
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.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
 
/**
 * 重复提交aop
 */
@Aspect
@Component
@Slf4j
public class AvoidRepeatableCommitAspect {
 
    @Autowired
    private RedisTemplate redisTemplate;
 
    @Around("@annotation(com.legendenergy.annotation.AvoidRepeatableCommit)")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest();
        // 操作类名
        String className = point.getTarget().getClass().getName();
        // 操作方法名
        String name = point.getSignature().getName();
        String ip = IpUtils.getIpAddr(request);
        String ipKey = String.format("%s#%s", className, name);
        int hashCode = Math.abs(ipKey.hashCode());
        String key = String.format("%s_%d", ip, hashCode);
        log.info("ipKey={},hashCode={},key={}", ipKey, hashCode, key);
        MethodSignature signature = (MethodSignature) point.getSignature();
        AvoidRepeatableCommit avoidRepeatableCommit = signature.getMethod().getAnnotation(AvoidRepeatableCommit.class);
        long timeout = avoidRepeatableCommit.timeout();
        if (timeout < 0) {
            //过期时间30s
            timeout = 1000 * 30;
        }
        String value = (String) redisTemplate.opsForValue().get(key);
        if (StringUtils.isNotBlank(value)) {
            return AjaxResult.success("请勿重复添加");
        }
        boolean flag=redisTemplate.opsForValue().setIfAbsent(key, UUID.randomUUID(), timeout, TimeUnit.MILLISECONDS);<br>        if(!flag){<br>           return  AjaxResult.success("暂不支持添加操作");        <br>        }
        //执行方法
        Object object = point.proceed();
        return object;
    }
 
}

第四步:接口上添加注解

送一个工具类IpUtils 

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package com.legendenergy.common.utils.ip;
 
import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.servlet.http.HttpServletRequest;
 
import com.legendenergy.common.utils.StringUtils;
 
/**
 * 获取IP方法
 */
public class IpUtils {
    /**
     * 获取客户端IP
     *
     * @param request 请求对象
     * @return IP地址
     */
    public static String getIpAddr(HttpServletRequest request) {
        if (request == null) {
            return "unknown";
        }
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Forwarded-For");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }
 
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
 
        return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : getMultistageReverseProxyIp(ip);
    }
 
    /**
     * 检查是否为内部IP地址
     *
     * @param ip IP地址
     * @return 结果
     */
    public static boolean internalIp(String ip) {
        byte[] addr = textToNumericFormatV4(ip);
        return internalIp(addr) || "127.0.0.1".equals(ip);
    }
 
    /**
     * 检查是否为内部IP地址
     *
     * @param addr byte地址
     * @return 结果
     */
    private static boolean internalIp(byte[] addr) {
        if (StringUtils.isNull(addr) || addr.length < 2) {
            return true;
        }
        final byte b0 = addr[0];
        final byte b1 = addr[1];
        // 10.x.x.x/8
        final byte SECTION_1 = 0x0A;
        // 172.16.x.x/12
        final byte SECTION_2 = (byte) 0xAC;
        final byte SECTION_3 = (byte) 0x10;
        final byte SECTION_4 = (byte) 0x1F;
        // 192.168.x.x/16
        final byte SECTION_5 = (byte) 0xC0;
        final byte SECTION_6 = (byte) 0xA8;
        switch (b0) {
            case SECTION_1:
                return true;
            case SECTION_2:
                if (b1 >= SECTION_3 && b1 <= SECTION_4) {
                    return true;
                }
            case SECTION_5:
                switch (b1) {
                    case SECTION_6:
                        return true;
                }
            default:
                return false;
        }
    }
 
    /**
     * 将IPv4地址转换成字节
     *
     * @param text IPv4地址
     * @return byte 字节
     */
    public static byte[] textToNumericFormatV4(String text) {
        if (text.length() == 0) {
            return null;
        }
 
        byte[] bytes = new byte[4];
        String[] elements = text.split("\\.", -1);
        try {
            long l;
            int i;
            switch (elements.length) {
                case 1:
                    l = Long.parseLong(elements[0]);
                    if ((l < 0L) || (l > 4294967295L)) {
                        return null;
                    }
                    bytes[0] = (byte) (int) (l >> 24 & 0xFF);
                    bytes[1] = (byte) (int) ((l & 0xFFFFFF) >> 16 & 0xFF);
                    bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
                    bytes[3] = (byte) (int) (l & 0xFF);
                    break;
                case 2:
                    l = Integer.parseInt(elements[0]);
                    if ((l < 0L) || (l > 255L)) {
                        return null;
                    }
                    bytes[0] = (byte) (int) (l & 0xFF);
                    l = Integer.parseInt(elements[1]);
                    if ((l < 0L) || (l > 16777215L)) {
                        return null;
                    }
                    bytes[1] = (byte) (int) (l >> 16 & 0xFF);
                    bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
                    bytes[3] = (byte) (int) (l & 0xFF);
                    break;
                case 3:
                    for (i = 0; i < 2; ++i) {
                        l = Integer.parseInt(elements[i]);
                        if ((l < 0L) || (l > 255L)) {
                            return null;
                        }
                        bytes[i] = (byte) (int) (l & 0xFF);
                    }
                    l = Integer.parseInt(elements[2]);
                    if ((l < 0L) || (l > 65535L)) {
                        return null;
                    }
                    bytes[2] = (byte) (int) (l >> 8 & 0xFF);
                    bytes[3] = (byte) (int) (l & 0xFF);
                    break;
                case 4:
                    for (i = 0; i < 4; ++i) {
                        l = Integer.parseInt(elements[i]);
                        if ((l < 0L) || (l > 255L)) {
                            return null;
                        }
                        bytes[i] = (byte) (int) (l & 0xFF);
                    }
                    break;
                default:
                    return null;
            }
        } catch (NumberFormatException e) {
            return null;
        }
        return bytes;
    }
 
    /**
     * 获取IP地址
     *
     * @return 本地IP地址
     */
    public static String getHostIp() {
        try {
            return InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
        }
        return "127.0.0.1";
    }
 
    /**
     * 获取主机名
     *
     * @return 本地主机名
     */
    public static String getHostName() {
        try {
            return InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
        }
        return "未知";
    }
 
    /**
     * 从多级反向代理中获得第一个非unknown IP地址
     *
     * @param ip 获得的IP地址
     * @return 第一个非unknown IP地址
     */
    public static String getMultistageReverseProxyIp(String ip) {
        // 多级反向代理检测
        if (ip != null && ip.indexOf(",") > 0) {
            final String[] ips = ip.trim().split(",");
            for (String subIp : ips) {
                if (false == isUnknown(subIp)) {
                    ip = subIp;
                    break;
                }
            }
        }
        return ip;
    }
 
    /**
     * 检测给定字符串是否为未知,多用于检测HTTP请求相关
     *
     * @param checkString 被检测的字符串
     * @return 是否未知
     */
    public static boolean isUnknown(String checkString) {
        return StringUtils.isBlank(checkString) || "unknown".equalsIgnoreCase(checkString);
    }
}

  

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