1 Maven依赖
org.springframework.boot
spring-boot-starter-data-redis
com.alibaba
fastjson
1.2.76
cn.hutool
hutool-all
5.5.1
2 RepeatedlyRequestWrapper
构建可重复读取inputStream的request。
package com.servlet;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.nio.charset.Charset;
/**
* 构建可重复读取inputStream的request
*/
public class RepeatedlyRequestWrapper extends HttpServletRequestWrapper {
private final String body;
public RepeatedlyRequestWrapper(HttpServletRequest request, ServletResponse response) throws IOException {
super(request);
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
body = getBodyString(request);
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(getInputStream()));
}
public String getBody() {
return body;
}
@Override
public ServletInputStream getInputStream() throws IOException {
final ByteArrayInputStream bais = new ByteArrayInputStream(body.getBytes("UTF-8"));
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) {
}
};
}
/**
* 获取Request请求body内容
*
* @param request
* @return
*/
private 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) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sb.toString();
}
}
3 RepeatableFilter
将原生的request变为可重复读取inputStream的request。
package com.filter;
import com.servlet.RepeatedlyRequestWrapper;
import org.springframework.http.MediaType;
import org.springframework.util.StringUtils;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
/**
* 过滤器（重写request）
*/
public class RepeatableFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
ServletRequest requestWrapper = null;
//将原生的request变为可重复读取inputStream的request
if (request instanceof HttpServletRequest
&& StringUtils.startsWithIgnoreCase(request.getContentType(), MediaType.APPLICATION_JSON_VALUE)) {
requestWrapper = new RepeatedlyRequestWrapper((HttpServletRequest) request, response);
}
if (null == requestWrapper) {
chain.doFilter(request, response);
} else {
chain.doFilter(requestWrapper, response);
}
}
}
4 RepeatSubmit
自定义注解（防止表单重复提交）。
package com.annotation;
import java.lang.annotation.*;
/**
* 自定义注解防止表单重复提交
*/
@Inherited
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RepeatSubmit {
}
5 RepeatSubmitInterceptor
防止重复提交拦截器。
package com.interceptor;
import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSONObject;
import com.annotation.RepeatSubmit;
import com.service.*;
import com.servlet.RepeatedlyRequestWrapper;
import org.springframework.beans.factory.annotation.*;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.*;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.*;
import java.util.concurrent.TimeUnit;
/**
* 防止重复提交拦截器
*/
@Component
public class RepeatSubmitInterceptor implements HandlerInterceptor {
public final String REPEAT_PARAMS = "repeatParams";
public final String REPEAT_TIME = "repeatTime";
/**
* 防重提交 redis key
*/
public final String REPEAT_SUBMIT_KEY = "repeat_submit:";
// 令牌自定义标识
@Value("${token.header}")
private String header;
@Autowired
private RedisService redisService;
/**
* 间隔时间，单位:秒
*
* 两次相同参数的请求，如果间隔时间大于该参数，系统不会认定为重复提交的数据
*/
@Value("${repeatSubmit.intervalTime}")
private int intervalTime;
@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)) {
//返回重复提交提示
Map resultMap = new HashMap<>();
resultMap.put("code", "500");
resultMap.put("msg", request.getRequestURI() + "不允许重复提交，请稍后再试");
try {
response.setStatus(200);
response.setContentType("application/json");
response.setCharacterEncoding("utf-8");
response.getWriter().print(JSONObject.toJSONString(resultMap));
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
}
return true;
} else {
return 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 boolean isRepeatSubmit(HttpServletRequest request) {
String nowParams = "";
if (request instanceof RepeatedlyRequestWrapper) {
RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
nowParams = repeatedlyRequest.getBody();
}
// 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 cacheRepeatKey = REPEAT_SUBMIT_KEY + submitKey;
Object sessionObj = redisService.getCacheObject(cacheRepeatKey);
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);
redisService.setCacheObject(cacheRepeatKey, 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;
}
}
6 RepeatSubmitConfig
防重复提交配置。
package com.config;
import com.filter.RepeatableFilter;
import com.interceptor.RepeatSubmitInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.*;
import org.springframework.web.servlet.config.annotation.*;
/**
* 防重复提交配置
*/
@Configuration
public class RepeatSubmitConfig implements WebMvcConfigurer {
@Autowired
private RepeatSubmitInterceptor repeatSubmitInterceptor;
/**
* 添加防重复提交拦截
*/
@Override
public void addInterceptors(InterceptorRegistry registry)
{
registry.addInterceptor(repeatSubmitInterceptor).addPathPatterns("/**");
}
/**
* 生成防重复提交过滤器（重写request）
* @return
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@Bean
public FilterRegistrationBean createRepeatableFilter()
{
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new RepeatableFilter());
registration.addUrlPatterns("/*");
registration.setName("repeatableFilter");
registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE);
return registration;
}
}
7 RepeatSubmitController
调试代码。
package com.controller;
import com.annotation.RepeatSubmit;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/repeatSubmit")
public class RepeatSubmitController {
/**
* 保存Param
* @param name
* @return
*/
@RepeatSubmit
@PostMapping("/saveParam/{name}")
public String saveParam(@PathVariable("name")String name){
return "保存Param成功";
}
/**
* 保存Param
* @param name
* @return
*/
@RepeatSubmit
@PostMapping("/saveBody")
public String saveBody(@RequestBody List name){
return "保存Body成功";
}
}
8 调试结果
param传参：
body传参：
注：
（1）RedisService源码请查看以下博客。
Spring Boot 配置Redis（缓存数据库）实现保存、获取、删除数据
（2）只有加上@RepeatSubmit的接口才会进行防重复提交校验。
到此这篇关于SpringBoot+Redis实现后端接口防重复提交校验的示例的文章就介绍到这了,更多相关SpringBoot接口防重复提交内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！