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防止重复提交，创建一个自定义的注解，通过继承HandlerInterceptorAdapter实现请求的拦截器，对方法上标有自定义注解的进行拦截，判断
判断是否为重复提交：
获取当前提交的数据和提交时间，以特定的key查询redis中是否存在数据，存在则进行对比，不存在则将数据和提交时间存入。
若依项目
自定义注解
java
/**
* 自定义注解防止表单重复提交
*
* @author ruoyi
*/
@Inherited
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RepeatSubmit {
}拦截器
java
/**
* 防止重复提交拦截器
*
* @author ruoyi
*/
@Component
public abstract class RepeatSubmitInterceptor extends HandlerInterceptorAdapter {
@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)) {
AjaxResult ajaxResult = AjaxResult.error("不允许重复提交，请稍后再试");
ServletUtils.renderString(response, JSONObject.toJSONString(ajaxResult));
return false;
}
}
return true;
} else {
return super.preHandle(request, response, handler);
}
}
/**
* 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);
}java
/**
* 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。
*
* @author ruoyi
*/
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor {
public final String REPEAT_PARAMS = "repeatParams";
public final String REPEAT_TIME = "repeatTime";
// 令牌自定义标识
@Value("${token.header}")
private String header;
@Autowired
private RedisCache redisCache;
/**
* 间隔时间，单位:秒 默认10秒
* <p>
* 两次相同参数的请求，如果间隔时间大于该参数，系统不会认定为重复提交的数据
*/
private int intervalTime = 10;
public void setIntervalTime(int intervalTime) {
this.intervalTime = intervalTime;
}
@SuppressWarnings("unchecked")
@Override
public boolean isRepeatSubmit(HttpServletRequest request) {
String nowParams = "";
//RepeatedlyRequestWrapper是可重复读取inputStream的request
if (request instanceof RepeatedlyRequestWrapper) {
RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
nowParams = HttpHelper.getBodyString(repeatedlyRequest);
}
// body参数为空，获取Parameter的数据
if (StringUtils.isEmpty(nowParams)) {
nowParams = JSONObject.toJSONString(request.getParameterMap());
}
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();
// token唯一值（没有消息头则使用请求地址）
String submitKey = request.getHeader(header);
if (StringUtils.isEmpty(submitKey)) {
submitKey = url;
}
// 唯一标识（指定key + 消息头）
String cache_repeat_key = Constants.REPEAT_SUBMIT_KEY + submitKey;
Object sessionObj = redisCache.getCacheObject(cache_repeat_key);
if (sessionObj != null) {
Map<String, Object> sessionMap = (Map<String, Object>) sessionObj;
if (sessionMap.containsKey(url)) {
Map<String, Object> preDataMap = (Map<String, Object>) sessionMap.get(url);
if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap)) {
return true;
}
}
}
Map<String, Object> cacheMap = new HashMap<String, Object>();
cacheMap.put(url, nowDataMap);
redisCache.setCacheObject(cache_repeat_key, cacheMap, intervalTime, TimeUnit.SECONDS);
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) {
long time1 = (Long) nowMap.get(REPEAT_TIME);
long time2 = (Long) preMap.get(REPEAT_TIME);
if ((time1 - time2) < (this.intervalTime * 1000)) {
return true;
}
return false;
}
}java
/**
* 通用http工具封装
*
* @author ruoyi
*/
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, Charset.forName("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();
}
}java
public class ResourcesConfig implements WebMvcConfigurer{
/**
* 自定义拦截规则
*/
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(repeatSubmitInterceptor).addPathPatterns("/**");
}
}构建可重复读取的request流： 新建一个类继承HttpServletRequestWrapper，重写其方法，然后新建类实现Filter的过滤器接口，在内部处理将HttpServletRequest转换未继承wrapper的类。
构建request的转化类
java
/**
* 构建可重复读取inputStream的request
*
* @author ruoyi
*/
public class RepeatedlyRequestWrapper extends HttpServletRequestWrapper {
private final byte[] body;
public RepeatedlyRequestWrapper(HttpServletRequest request, ServletResponse response) throws IOException {
super(request);
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
body = HttpHelper.getBodyString(request).getBytes("UTF-8");
}
@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 boolean isFinished() {
return false;
}
@Override
public boolean isReady() {
return false;
}
@Override
public void setReadListener(ReadListener readListener) {
}
};
}
}可重复读取流的过滤器
java
/**
* Repeatable 过滤器
*
* @author ruoyi
*/
public class RepeatableFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
ServletRequest requestWrapper = null;
if (request instanceof HttpServletRequest
&& StringUtils.equalsAnyIgnoreCase(request.getContentType(), MediaType.APPLICATION_JSON_VALUE)) {
requestWrapper = new RepeatedlyRequestWrapper((HttpServletRequest) request, response);
}
if (null == requestWrapper) {
chain.doFilter(request, response);
} else {
chain.doFilter(requestWrapper, response);
}
}
@Override
public void destroy() {
}
}在配置文件中启动
java
@SuppressWarnings({"rawtypes", "unchecked"})
@Bean
public FilterRegistrationBean someFilterRegistration() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new RepeatableFilter());
registration.addUrlPatterns("/*");
registration.setName("repeatableFilter");
registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE);
return registration;
}