Springboot设置接口允许跨域

！！！前排提醒 ，如果nginx 设置了跨域相关配置，代码就不用设置了！！！

 No 'Access-Control-Allow-Origin' header is present on the requested resource.

跨域问题解决方案：

CORSInterceptor.java：

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @Author : JCccc
 * @CreateTime : 2019/11/13
 * @Description : 跨域设置拦截器
 **/
@Component
public class CORSInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //添加跨域CORS
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Headers", "X-Requested-With,content-type,token");
        response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH");
        response.setHeader("Access-Control-Max-Age", "3600");

        return true;
    }
}

 WebConfigurer.java：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @Author : JCccc
 * @CreateTime : 2019/10/25
 * @Description : 拦截器配置总部
 *   普及：Tomcat（Filter->Servlet->Interceptor->Controller）
 **/
@Configuration
public class WebConfigurer implements WebMvcConfigurer {

    @Autowired
    private CORSInterceptor corsInterceptor;


    // 这个方法是用来配置静态资源的，比如html，js，css，等等
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {


    }

    // 这个方法用来注册拦截器，我们自己写好的拦截器需要通过这里添加注册才能生效
    @Override
    public void addInterceptors(InterceptorRegistry registry) {

         registry.addInterceptor(corsInterceptor);

    }


    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedHeaders("*")
                .allowedMethods("GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH")
                .allowCredentials(true)
                .maxAge(3600)
                .allowedOrigins("*");
    }



}

解决。