代码

首先创建跨域拦截器

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package top.marken.onlineclass.interceptor;

import org.springframework.http.HttpMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CrossInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//表示接受任意域名的请求,也可以指定域名
response.setHeader("Access-Control-Allow-Origin", request.getHeader("origin"));

//该字段可选,是个布尔值,表示是否可以携带cookie
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT,PATCH, DELETE, OPTIONS");
response.setHeader("Access-Control-Allow-Headers", "*");

if (HttpMethod.OPTIONS.toString().equals(request.getMethod())) {
return true;
}
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
}
}

然后将拦截器注入到容器中并配置拦截规则

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package cn.edu.cdtu.contactmanagement.config;

import cn.edu.cdtu.contactmanagement.intercept.CrossInterceptor;
import cn.edu.cdtu.contactmanagement.intercept.LoginInterceptor;
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 InterceptorConfig implements WebMvcConfigurer {
/**
* 向容器中添加跨域验证拦截器
* @return
*/
@Bean
public CrossInterceptor crossInterceptor() {
return new CrossInterceptor();
}

/**
* 拦截规则
* @param registry
*/
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(crossInterceptor())
.addPathPatterns("/**");
WebMvcConfigurer.super.addInterceptors(registry);
}
}