Springboot设置接口允许跨域

待我称王封你为后i 2023-03-12 09:09 2阅读 0赞

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

![202005141700012.png][]

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

跨域问题解决方案：

![20200514170114890.png][]

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。 #

[202005141700012.png]: /images/20230312/6fcd18ac2a00403da3b54c3ab0824473.png
[20200514170114890.png]: /images/20230312/02fb27ba1aa44d0da76444db694408dc.png