池州网站建设兼职,微信官网登陆,备案的网站必须打开吗,汨罗做网站防重复提交#xff1a;自定义注解 拦截器#xff08;HandlerInterceptor#xff09;
一、思路#xff1a;
1、首先自定义注解#xff1b;
2、创建拦截器实现类#xff08;自定义类名称#xff09;#xff0c;拦截器#xff08;HandlerInterceptor#xff09;;
3…防重复提交自定义注解 拦截器HandlerInterceptor
一、思路
1、首先自定义注解
2、创建拦截器实现类自定义类名称拦截器HandlerInterceptor;
3、创建类配置拦截器路径拦截URL规则; 二、代码示例
1、首先自定义注解
import java.lang.annotation.*;/*** ClassName Resubmit* Descripition 自定义注解-防重复提交* Author * Date 2023/8/31 10:38*/
Documented
Retention(RetentionPolicy.RUNTIME)
Target({ElementType.TYPE, ElementType.METHOD})
public interface Resubmit {/*** 默认过期时间* 单位:秒** return*/int value() default 100;/*** 频繁请求提示语** return*/String messge() default 请求过于频繁,请稍后再试!;}2、创建拦截器实现类自定义类名称拦截器HandlerInterceptor;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;/*** ClassName ResubmitInterceptorUtil* Descripition 防重复提拦截器工具类* Author * Date 2023/8/31 10:52*/
Slf4j
Component
public class ResubmitInterceptorUtil implements HandlerInterceptor {// key: 固定前缀private static final String FIXED_SESSION repeatData;Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {try {if (handler instanceof HandlerMethod) {HandlerMethod handlerMethod (HandlerMethod) handler;// 请求方法Method method handlerMethod.getMethod();// 获取自定义注解-防重复注解(Resubmit)Resubmit annotation method.getAnnotation(Resubmit.class);// 判断方法是否添加自定义注解(Resubmit)if (annotation ! null) {//如果重复相同数据if (repeatDataValidator(request)) {// 自定义返回结果类Result result new Result();result.setCode(500);result.setMessage(annotation.messge());// 设置字符集编码response.setCharacterEncoding(UTF-8);// response.getWriter().write(JSON.toJSONString(请勿频繁提交请求,稍后再试.));response.getWriter().write(JSON.toJSONString(result));return false;} else {return true;}}return true;} else {return true;}} catch (IOException e) {log.error(防重复提拦截器工具类异常, e);return false;}}/*** 验证同一个url数据是否相同提交,相同返回true** param request* return*/private boolean repeatDataValidator(HttpServletRequest request) {// 获取POST请求体-body-入参String params getRequestBodyParam(request);// 获取请求路径String url request.getRequestURI();MapString, String map new HashMap();// 组装Map key: url、 value:url请求方法体时间map.put(url, params);String nowUrlParams JSON.toJSONString(map);Object preUrlParams request.getSession().getAttribute(FIXED_SESSION);//如果上一个数据为null,表示还没有访问页面if (preUrlParams null) {//如果上一个数据为null,表示还没有访问页面request.getSession().setAttribute(FIXED_SESSION, nowUrlParams);return false;} else {//如果上次url数据和本次url数据相同则表示重复添加数据if (preUrlParams.equals(nowUrlParams)) {log.info([请求频繁提交 repeatDataValidator URL :{}; param :{}], url, params);return true;} else {//如果上次 url数据 和本次url加数据不同则不是重复提交request.getSession().setAttribute(FIXED_SESSION, nowUrlParams);return false;}}}/*** 获取请求体-body-入参** param request* return*/private String getRequestBodyParam(HttpServletRequest request) {BufferedReader bufferedReader null;StringBuffer stringBuffer new StringBuffer();try {bufferedReader request.getReader();String str null;while ((str bufferedReader.readLine()) ! null) {stringBuffer.append(str);}bufferedReader.close();} catch (IOException e) {log.error(解析入参异常, e);} finally {if (bufferedReader ! null) {try {bufferedReader.close();} catch (IOException e) {log.error(解析入参异常, e);}}}return stringBuffer.toString();}
}3、创建类配置拦截器路径拦截URL规则;
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;/*** ClassName WebMvcConfig* Descripition 配置拦截路径* Author * Date 2023/9/1 10:08*/
Configuration
public class WebMvcConfig implements WebMvcConfigurer {Autowiredprivate ResubmitInterceptorUtil resubmitInterceptorUtil;Overridepublic void addInterceptors(InterceptorRegistry registry) {// 配置拦截类registry.addInterceptor(resubmitInterceptorUtil)// 设置拦截路径URL.addPathPatterns(/**);}}
