处理接口幂等性的两种常见方案 - ToB企服应用市场:ToB评测及商务社交产业平台

spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=123

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@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);
}
}

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@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
*/
public int interval() default 5000;
/**
* 提示消息
*/
public String message() default "不允许重复提交，请稍候再试";
}

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public abstract class RepeatSubmitInterceptor implements HandlerInterceptor {
@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);
}

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@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;
}
}

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@Configuration
public class WebConfig implements WebMvcConfigurer {
@Autowired
RepeatSubmitInterceptor repeatSubmitInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(repeatSubmitInterceptor)
.addPathPatterns("/**");
}
}

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

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