实现接口幂等

接口幂等

文章目录

- 实现接口幂等
接口幂等

1.基于 Token

基于 Token 这种方案的实现思路很简单，整个流程分两步：

客户端发送请求，从服务端获取一个 Token 令牌，每次请求获取到的都是一个全新的令牌。
客户端发送请求的时候，携带上第一步的令牌，处理请求之前，先校验令牌是否存在，当请求处理成功，就把令牌删除掉。

2. 基于请求参数的校验

拦截器方式

需要引入redis

使用一个拦截器实现，拦截需要接口幂等的接口方法；

判断是否是重复提交的数据

根据url + 参数 + 用户的身份认证token 为key判断幂等

1.搭建一个springboot 项目

pom.xml依赖：

web , redis , commons-lang3

 <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- redis依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.6.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
    </dependencies>

配置文件

application.yml

server:
  port: 8001

spring:
  redis:
    # 地址
    host: 127.0.0.1
    # 端口，默认为6379
    port: 6379
    # 密码
    # 连接超时时间
    timeout: 10s
    lettuce:
      pool:
        # 连接池中的最小空闲连接
        min-idle: 0
        # 连接池中的最大空闲连接
        max-idle: 8
        # 连接池的最大数据库连接数
        max-active: 8
        # #连接池最大阻塞等待时间（使用负值表示没有限制）
        max-wait: -1ms

配置redis配置类

RedisTemplateConfig

@EnableCaching
@Configuration
public class RedisTemplateConfig extends CachingConfigurerSupport {

    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);

        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        // key采用 String的序列化方式
        redisTemplate.setKeySerializer(stringRedisSerializer);
        // hash的 key也采用 String的序列化方式
        redisTemplate.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用 jdk
        redisTemplate.setValueSerializer(new JdkSerializationRedisSerializer());
        // hash的 value序列化方式采用 jdk
        redisTemplate.setHashValueSerializer(new JdkSerializationRedisSerializer());
        redisTemplate.afterPropertiesSet();

        return redisTemplate;
    }

}

封装redis的缓存工具类

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

/**
 * @author: wenyi
 * @create: 2022/12/8
 * @Description: 封装redis
 */
@Component
public class RedisCache {
    @Autowired
    public RedisTemplate redisTemplate;

    public <T> void setCacheObject(final String key, final T value, final Integer timeout, final TimeUnit timeUnit) {
        redisTemplate.opsForValue().set(key, value, timeout, timeUnit);
    }

    public <T> T getCacheObject(final String key) {
        ValueOperations<String, T> operation = redisTemplate.opsForValue();
        return operation.get(key);
    }
}

HttpServletRequest 读取一次后，后续就读取不了

构建可重复读取inputStream的request

public class RepeatedlyRequestWrapper extends HttpServletRequestWrapper {
    private final byte[] body;

    public RepeatedlyRequestWrapper(HttpServletRequest request, ServletResponse response) throws IOException {
        super(request);
        request.setCharacterEncoding(Constants.UTF8);
        response.setCharacterEncoding(Constants.UTF8);

        body = HttpHelper.getBodyString(request).getBytes(Constants.UTF8);
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body);
        return new ServletInputStream() {
            @Override
            public int read() throws IOException {
                return bais.read();
            }

            @Override
            public int available() throws IOException {
                return body.length;
            }

            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {

            }
        };
    }
}

通用常量信息

public class Constants {
    /**
     * UTF-8 字符集
     */
    public static final String UTF8 = "UTF-8";
}

通用http工具封装

/**
 * 通用http工具封装
 *
 */
public class HttpHelper {
    private static final Logger LOGGER = LoggerFactory.getLogger(HttpHelper.class);

    public static String getBodyString(ServletRequest request) {
        StringBuilder sb = new StringBuilder();
        BufferedReader reader = null;
        try (InputStream inputStream = request.getInputStream()) {
            reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
            String line = "";
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            LOGGER.warn("getBodyString出现问题！");
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    LOGGER.error(ExceptionUtils.getMessage(e));
                }
            }
        }
        return sb.toString();
    }
}

2.定义接口幂等注解

自定义一个注解，在需要进行幂等性处理的接口上，添加该注解即可，将来这个接口就会自动的进行幂等性处理。

import java.lang.annotation.*;

/**
 * 作用在接口方法上的 幂等性处理注解
 */
@Inherited
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RepeatSubmit {
    /**
     * 间隔时间(ms)，小于此时间视为重复提交
     */
    int interval() default 5000;

    /**
     * 提示消息
     */
    String message() default "不允许重复提交，请稍候再试";

}

3.实现拦截器

定义抽象拦截器父类

接口方法拦截下来，然后找到接口上的 @RepeatSubmit 注解，调用 isRepeatSubmit 方法去判断是否是重复提交的数据

import com.fasterxml.jackson.databind.ObjectMapper;
import com.ung.myUrl.annotation.RepeatSubmit;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

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

/**
 * @author: wenyi
 * @create: 2022/12/8
 * @Description: 抽象的拦截器
 */
public abstract class RepeatSubmitInterceptor implements HandlerInterceptor {
    /**
     * 将接口方法拦截下来，然后找到接口上的 @RepeatSubmit 注解，调用 isRepeatSubmit 方法去判断是否是重复提交的数据
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @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, annotation)) {
                    Map<String, Object> map = new HashMap<>();
                    map.put("status", 500);
                    map.put("msg", annotation.message());
                    response.setContentType("application/json;charset=utf-8");
                    response.getWriter().write(new ObjectMapper().writeValueAsString(map));
                    return false;
                }
            }
            return true;
        } else {
            return true;
        }
    }

    /**
     * 验证是否重复提交由子类实现具体的防重复提交的规则
     *
     * @param request
     * @return
     * @throws Exception
     */
    public abstract boolean isRepeatSubmit(HttpServletRequest request, RepeatSubmit annotation);
}

子类实现父类的具体判断幂等规则

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.ung.myUrl.annotation.RepeatSubmit;
import com.ung.myUrl.filter.RepeatedlyRequestWrapper;
import com.ung.myUrl.utils.RedisCache;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author: wenyi
 * @create: 2022/12/8
 * @Description: 判断请求url和数据是否和上一次相同，
 * * 如果和上次相同，则是重复提交表单。 有效时间为10秒内。
 */
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor {
    public final String REPEAT_PARAMS = "repeatParams";

    public final String REPEAT_TIME = "repeatTime";
    public final static String REPEAT_SUBMIT_KEY = "REPEAT_SUBMIT_KEY";

    private String header = "Authorization";

    @Autowired
    private RedisCache redisCache;

    @SuppressWarnings("unchecked")
    @Override
    public boolean isRepeatSubmit(HttpServletRequest request, RepeatSubmit annotation) {
        String nowParams = "";
        if (request instanceof RepeatedlyRequestWrapper) {
            RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
            try {
                nowParams = repeatedlyRequest.getReader().readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        // body参数为空，获取Parameter的数据
        if (StringUtils.isEmpty(nowParams)) {
            try {
                nowParams = new ObjectMapper().writeValueAsString(request.getParameterMap());
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
        }
        Map<String, Object> nowDataMap = new HashMap<String, Object>();
        nowDataMap.put(REPEAT_PARAMS, nowParams);
        nowDataMap.put(REPEAT_TIME, System.currentTimeMillis());

        // 请求地址（作为存放cache的key值）
        String url = request.getRequestURI();

        // 唯一值（没有消息头则使用请求地址）
        String submitKey = request.getHeader(header);

        // 唯一标识（指定key + url + 消息头）
        String cacheRepeatKey = REPEAT_SUBMIT_KEY + url + submitKey;

        Object sessionObj = redisCache.getCacheObject(cacheRepeatKey);
        if (sessionObj != null) {
            Map<String, Object> sessionMap = (Map<String, Object>) sessionObj;
            if (compareParams(nowDataMap, sessionMap) && compareTime(nowDataMap, sessionMap, annotation.interval())) {
                return true;
            }
        }
        redisCache.setCacheObject(cacheRepeatKey, nowDataMap, annotation.interval(), TimeUnit.MILLISECONDS);
        return false;
    }

    /**
     * 判断参数是否相同
     */
    private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap) {
        String nowParams = (String) nowMap.get(REPEAT_PARAMS);
        String preParams = (String) preMap.get(REPEAT_PARAMS);
        return nowParams.equals(preParams);
    }

    /**
     * 判断两次间隔时间
     */
    private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap, int interval) {
        long time1 = (Long) nowMap.get(REPEAT_TIME);
        long time2 = (Long) preMap.get(REPEAT_TIME);
        if ((time1 - time2) < interval) {
            return true;
        }
        return false;
    }
}

最后配置拦截器

import com.ung.myUrl.interceptor.RepeatSubmitInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @author: wenyi
 * @create: 2022/12/8
 * @Description: 配置拦截器
 */
@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Autowired
    RepeatSubmitInterceptor repeatSubmitInterceptor;

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

4.使用幂等注解

最后在controller使用

@RestController
public class HelloController {

    @PostMapping("/hello")
    @RepeatSubmit(interval = 100000)
    public String hello(@RequestBody String msg) {
        System.out.println("msg = " + msg);
        return "hello";
    }
}

5.测试使用

post请求 http://localhost:8001/hello

设置token ，这里不需要token认证，随便一个就行

在这里插入图片描述

最后请求成功，可以看到redis里面有数据，就是按照指定key + URL + token

在这里插入图片描述

连续再次点击，会提示不允许重复提交，说明幂等设置成功

AOP方式

实现防刷切面PreventAop.java

大致逻辑为：定义一切面，通过@Prevent注解作为切入点、在该切面的前置通知获取该方法的所有入参并将其Base64编码，将入参Base64编码+完整方法名作为redis的key，入参作为reids的value，@Prevent的value作为redis的expire，存入redis；每次进来这个切面根据入参Base64编码+完整方法名判断redis值是否存在，存在则拦截防刷，不存在则允许调用；

pom依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.11</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ung</groupId>
    <artifactId>controller-test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>controller-test</name>
    <description>Demo project for Spring Boot</description>
    <packaging>jar</packaging>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <!--json以來-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.68</version>
        </dependency>

        <!--校验注解-->
        <dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>6.0.7.Final</version>
        </dependency>

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

        <!-- redis依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.6.4</version>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

配置文件配置redis

server:
  port: 8001
spring:
  redis:
    # 地址
    host: 127.0.0.1
    # 端口，默认为6379
    port: 6379
    # 密码
    # 连接超时时间
    timeout: 10s
    lettuce:
      pool:
        # 连接池中的最小空闲连接
        min-idle: 0
        # 连接池中的最大空闲连接
        max-idle: 8
        # 连接池的最大数据库连接数
        max-active: 8
        # #连接池最大阻塞等待时间（使用负值表示没有限制）
        max-wait: -1ms

Redis 配置

package com.ung.controllertest.config;

import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@EnableCaching
@Configuration
public class RedisTemplateConfig extends CachingConfigurerSupport {

    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);

        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        // key采用 String的序列化方式
        redisTemplate.setKeySerializer(stringRedisSerializer);
        // hash的 key也采用 String的序列化方式
        redisTemplate.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用 jdk
        redisTemplate.setValueSerializer(new JdkSerializationRedisSerializer());
        // hash的 value序列化方式采用 jdk
        redisTemplate.setHashValueSerializer(new JdkSerializationRedisSerializer());
        redisTemplate.afterPropertiesSet();

        return redisTemplate;
    }

}

定义 RedisUtil 操作的工具类

package com.ung.controllertest.utils;

import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.*;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

/**
 * Redis工具类
 */
@Component
public class RedisUtil {
    @Autowired
    private RedisTemplate redisTemplate;
    @Resource(name="redisTemplate")
    private ValueOperations<String, String> valueOperations;
    @Resource(name="redisTemplate")
    private HashOperations<String, String, Object> hashOperations;
    @Resource(name="redisTemplate")
    private ListOperations<String, Object> listOperations;
    @Resource(name="redisTemplate")
    private SetOperations<String, Object> setOperations;
    @Resource(name="redisTemplate")
    private ZSetOperations<String, Object> zSetOperations;

    /**  默认过期时长，单位：秒 */
    public final static long DEFAULT_EXPIRE = 60 * 60 * 24;
    /**  不设置过期时长 */
    public final static long NOT_EXPIRE = -1;

    public void set(String key, Object value, long expire){
        valueOperations.set(key, toJson(value));
        if(expire != NOT_EXPIRE){
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
    }

    public void set(String key, Object value){
        set(key, value, DEFAULT_EXPIRE);
    }

    public <T> T get(String key, Class<T> clazz, long expire) {
        String value = valueOperations.get(key);
        if(expire != NOT_EXPIRE){
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
        return value == null ? null : fromJson(value, clazz);
    }

    public <T> T get(String key, Class<T> clazz) {
        return get(key, clazz, NOT_EXPIRE);
    }

    public String get(String key, long expire) {
        String value = valueOperations.get(key);
        if(expire != NOT_EXPIRE){
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
        return value;
    }

    public String get(String key) {
        return get(key, NOT_EXPIRE);
    }

    public void delete(String key) {
        redisTemplate.delete(key);
    }

    /**
     * Object转成JSON数据
     */
    private String toJson(Object object){
        if(object instanceof Integer || object instanceof Long || object instanceof Float ||
                object instanceof Double || object instanceof Boolean || object instanceof String){
            return String.valueOf(object);
        }
        return JSON.toJSONString(object);
    }

    /**
     * JSON数据，转成Object
     */
    private <T> T fromJson(String json, Class<T> clazz){
        return JSON.parseObject(json, clazz);
    }
}

定义注解Prevent

package com.ung.controllertest.annotation;

import com.ung.controllertest.enums.PreventStrategyEnum;

import java.lang.annotation.*;

/**
 * 接口防刷注解
 * 使用：
 * 在相应需要防刷的方法上加上
 * 该注解，即可
 */
@Documented
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Prevent {

    /**
     * 限制的时间值（秒）
     *
     * @return
     */
    String value() default "60";

    /**
     * 提示
     */
    String message() default "";

    /**
     * 策略
     *
     * @return
     */
    PreventStrategyEnum strategy() default PreventStrategyEnum.DEFAULT;
}

定义枚举设置策略

package com.ung.controllertest.enums;

/**
 * 防刷策略枚举
 */
public enum PreventStrategyEnum {
    /**
     * 默认(1分钟内不允许再次请求）
     */
    DEFAULT
}

实现防刷切面PreventAop

package com.ung.controllertest.aop;

import com.alibaba.fastjson.JSON;
import com.ung.controllertest.annotation.Prevent;
import com.ung.controllertest.enums.PreventStrategyEnum;
import com.ung.controllertest.exception.BusinessException;
import com.ung.controllertest.utils.RedisUtil;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;
import java.util.Base64;

/**
 * 大致逻辑为：
 * 定义一切面，通过@Prevent注解作为切入点、在该切面的前置通知获取该方法的所有入参并将其Base64编码，
 * 将入参Base64编码+完整方法名作为redis的key，入参作为reids的value，@Prevent的value作为redis的expire，存入redis；
 * 每次进来这个切面根据入参Base64编码+完整方法名判断redis值是否存在，
 * 存在则拦截防刷，不存在则允许调用；
 */
@Aspect
@Component
@Slf4j
public class PreventAop {

    @Autowired
    private RedisUtil redisUtil;

    /**
     * 切入点
     */
    @Pointcut("@annotation(com.ung.controllertest.annotation.Prevent)")
    public void pointcut() {
    }

    /**
     * 处理前
     *
     * @return
     */
    @Before("pointcut()")
    public void joinPoint(JoinPoint joinPoint) throws Exception {
        //获取ip
        HttpServletRequest request = (HttpServletRequest) joinPoint.getArgs()[0];
        String ip = getIp(request);
        System.out.println("请求的：" + ip);
        //获取请求参数
        String requestStr = null;
        //如果入参个数 !=1
        if (joinPoint.getArgs().length != 1) {
            for (int i = 1; i < joinPoint.getArgs().length; i++) {
                requestStr += JSON.toJSONString(joinPoint.getArgs()[i]);
            }
            if (StringUtils.isEmpty(requestStr) || requestStr.equalsIgnoreCase("{}")) {
                throw new BusinessException("[防刷]入参不允许为空");
            }
        }


        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        Method method = joinPoint.getTarget().getClass().getMethod(methodSignature.getName(),
                methodSignature.getParameterTypes());

        Prevent preventAnnotation = method.getAnnotation(Prevent.class);
        String methodFullName = method.getDeclaringClass().getName() + method.getName();

        entrance(preventAnnotation, ip + requestStr, methodFullName);
        return;
    }

    public String getIp(HttpServletRequest request) {
        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("WL-Proxy-Client-IP");

        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getHeader("HTTP_CLIENT_IP");

        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getHeader("HTTP_X_FORWARDED_FOR");

        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getRemoteAddr();

        }
        return ip;
    }

    /**
     * 入口
     *
     * @param prevent
     * @param requestStr
     */
    private void entrance(Prevent prevent, String requestStr, String methodFullName) throws Exception {
        PreventStrategyEnum strategy = prevent.strategy();
        switch (strategy) {
            case DEFAULT:
                defaultHandle(requestStr, prevent, methodFullName);
                break;
            default:
                throw new BusinessException("无效的策略");
        }
    }

    /**
     * 默认处理方式
     *
     * @param requestStr
     * @param prevent
     */
    private void defaultHandle(String requestStr, Prevent prevent, String methodFullName) throws Exception {
        String base64Str = toBase64String(requestStr);
        long expire = Long.parseLong(prevent.value());

        String resp = redisUtil.get(methodFullName + base64Str);
        if (StringUtils.isEmpty(resp)) {
            redisUtil.set(methodFullName + base64Str, requestStr, expire);
        } else {
            String message = !StringUtils.isEmpty(prevent.message()) ? prevent.message() :
                    expire + "秒内不允许重复请求";
            throw new BusinessException(message);
        }
    }

    /**
     * 对象转换为base64字符串
     *
     * @param obj 对象值
     * @return base64字符串
     */
    private String toBase64String(String obj) throws Exception {
        if (StringUtils.isEmpty(obj)) {
            return null;
        }
        Base64.Encoder encoder = Base64.getEncoder();
        byte[] bytes = obj.getBytes("UTF-8");
        return encoder.encodeToString(bytes);
    }
}

controller接口使用注解

package com.ung.controllertest.controller;

import com.ung.controllertest.annotation.Prevent;
import com.ung.controllertest.pojo.dto.UserDto;
import com.ung.controllertest.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import java.util.List;

@RestController
public class UserController {

    private UserService userService;

    @Autowired
    public UserController(UserService userService) {
        this.userService = userService;
    }

    @GetMapping("/user/getById/{id}")
    public UserDto getById(@PathVariable("id") Long id) {
        return userService.getById(id);
    }

    @GetMapping("/user/getList")
    @Prevent(value = "10",message = "10秒内不能重复请求")
    public List<UserDto> getList(HttpServletRequest request) {
        return userService.getList();
    }

    @PostMapping("/user/addUser")
    @Prevent(value = "10",message = "10秒内不能重复请求")
    public boolean addUser(HttpServletRequest request, @RequestBody UserDto userDto) {
        return userService.addUser(userDto);
    }

    @GetMapping("/user/getUserName/{id}")
    public String getUserName(@PathVariable("id") Long id) {
        return userService.getUserName(id);
    }
}

最后请求接口测试

http://localhost:8001/user/addUser

{
    "username": "username",
    "password": "123456",
    "email": "123@qq.com",
    "phone": "13900445200"
}

在这里插入图片描述

连续请求会拒绝

在这里插入图片描述

对没有请求参数的get请求也是一样的有效

http://localhost:8001/user/getList

在这里插入图片描述

原文链接：https://blog.csdn.net/weixin_46685542/article/details/127012151

实现接口幂等

实现接口幂等

接口幂等

文章目录

1.基于 Token

2. 基于请求参数的校验

拦截器方式

1.搭建一个springboot 项目

2.定义接口幂等注解

3.实现拦截器

4.使用幂等注解

5.测试使用

AOP方式

实现防刷切面PreventAop.java

配置文件配置redis

Redis 配置

定义 RedisUtil 操作的工具类

定义注解Prevent

定义枚举设置策略

实现防刷切面PreventAop

标签云

近期文章

分类

实现接口幂等

实现接口幂等

接口幂等

文章目录

1.基于 Token

2. 基于请求参数的校验

拦截器方式

1.搭建一个springboot 项目

2.定义接口幂等注解

3.实现拦截器

4.使用幂等注解

5.测试使用

AOP方式

实现防刷切面PreventAop.java

配置文件 配置redis

Redis 配置

定义 RedisUtil 操作的工具类

定义注解Prevent

定义枚举 设置策略

实现防刷切面PreventAop

相关文章

配置文件配置redis

定义枚举设置策略