SpringBoot解决跨域问题

代码

首先创建跨域拦截器

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

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);
    }
}