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
<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
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
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");
}
redisTemplate.opsForValue().set(key, UUID.randomUUID(), timeout, TimeUnit.MILLISECONDS);
//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
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);
}
}