• springboot自定义注解防止表单重复提交

    功能实现:使用了自定义注解、自定义拦截器、redis缓存等知识点。

    具体代码如下:

    1.注解类

    package com.ahzx.custcent.config.interceptor;

import java.lang.annotation.*;

/**
 * 自定义注解类
 */
@Inherited
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RepeatSubmit {

}

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    2.防止重复提交拦截器类

    package com.ahzx.custcent.config.interceptor;
import com.ahzx.common.domain.AjaxResult;
import com.ahzx.custcent.util.ServletUtils;
import com.alibaba.fastjson.JSONObject;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

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

/**
 * 防止重复提交拦截器
 */
@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);
}


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    3.具体拦截逻辑类

    package com.ahzx.custcent.config.interceptor;
import cn.hutool.core.util.StrUtil;
import com.ahzx.common.consts.Constants;
import com.ahzx.common.filter.RepeatedlyRequestWrapper;
import com.ahzx.common.service.RedisCache;
import com.ahzx.custcent.util.HttpHelper;
import com.ahzx.custcent.util.StringUtils;
import com.alibaba.fastjson.JSONObject;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

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

/**
 * 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
     * 
    
     * 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 = "";
        if (request instanceof RepeatedlyRequestWrapper) {
            RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
            nowParams = HttpHelper.getBodyString(repeatedlyRequest);
        }

        // body参数为空，获取Parameter的数据
        if (StrUtil.isBlank(nowParams)) {
            nowParams = JSONObject.toJSONString(request.getParameterMap());
        }
        Map nowDataMap = new HashMap();
        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);
        if (StrUtil.isBlank(submitKey)) {
            submitKey = url;
        }

        // 唯一标识（指定key + 消息头）
        String cache_repeat_key = "repeat_submit:" + submitKey;

        Object sessionObj = redisCache.getCacheObject(cache_repeat_key);
        if (sessionObj != null) {
            Map sessionMap = (Map) sessionObj;
            if (sessionMap.containsKey(url)) {
                Map preDataMap = (Map) sessionMap.get(url);
                if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap)) {
                    return true;
                }
            }
        }
        Map cacheMap = new HashMap();
        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 nowMap, Map 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 nowMap, Map 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;
    }
}


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    4.添加自定义拦截器类(必须有这个拦截才会生效)

    package com.ahzx.custcent.config;


import com.ahzx.custcent.config.interceptor.JwtInterceptor;
import com.ahzx.custcent.config.interceptor.RepeatSubmitInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebAppConfig implements WebMvcConfigurer {

    @Autowired
    private JwtInterceptor jwtInterceptor;
    @Autowired
    private CorsInterceptor corsInterceptor;

    @Autowired
    private RepeatSubmitInterceptor repeatSubmitInterceptor;

    @Bean
    InterceptorRegistry interceptorRegistry() {
        return new InterceptorRegistry();
    }

    @Autowired

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(corsInterceptor).addPathPatterns("/**");
        registry.addInterceptor(jwtInterceptor).addPathPatterns("/**");
        registry.addInterceptor(repeatSubmitInterceptor).addPathPatterns("/**");
    }
}


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    5.过滤器(构建可重复读取inputStream的request)

    package com.ahzx.common.filter;


import com.ahzx.custcent.util.HttpHelper;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * 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) {

            }
        };
    }
}


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    ======================== 以下是上述主要逻辑的配套工具类 ========================

    6.配套工具类,上面代码封装的一些方法可以在这里面找

    6.1 ServletUtils

    package com.ahzx.custcent.util;

import cn.hutool.core.convert.Convert;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * 客户端工具类
 * 
 * @author
 */
public class ServletUtils
{
    /**
     * 将字符串渲染到客户端
     * 
     * @param response 渲染对象
     * @param string 待渲染的字符串
     * @return null
     */
    public static String renderString(HttpServletResponse response, String string)
    {
        try
        {
            response.setStatus(200);
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            response.getWriter().print(string);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        return null;
    }
}


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    6.2 HttpHelper

    package com.ahzx.custcent.util;

import org.apache.commons.lang3.exception.ExceptionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.ServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

/**
 * 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();
    }
}


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  • 原文地址：https://blog.csdn.net/whlqunzhu/article/details/125776922