SpringBoot跨域问题解决

前端访问后台接口时，浏览器报错，跨域无法访问。

报错信息如下：

Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

经过一番百度之后，需要在控制器上添加处理跨域的注解，

注解添加后，再次访问接口，又有了新的报错：

Response to preflight request doesn't pass access control check: It does not have HTTP ok status.

根据资料显示，这个是因为浏览器预检请求失败，复杂请求会做预检请求，比如header中有自动以的属性等情况，当前的报错是指OPTION 请求失败，需要后端放行 OPTION 请求。

解决方法是定义个拦截器： 

CorsInterceptor.java

package com.interceptor;import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;@Component
public class CorsInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {response.setHeader("Access-Control-Allow-Origin", "*");response.setHeader("Access-Control-Allow-Credentials", "true");response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, PATCH, DELETE, OPTIONS");response.setHeader("Access-Control-Max-Age", "86400");response.setHeader("Access-Control-Allow-Headers", "*");// 如果是OPTIONS则结束请求if (HttpMethod.OPTIONS.toString().equals(request.getMethod())) {response.setStatus(HttpStatus.NO_CONTENT.value());return false;}return true;}
}

然后将拦截器注册到全局拦截器中，使其生效。

WebConfig.java

package com.config;import com.interceptor.CorsInterceptor;
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;@Configuration
public class WebConfig implements WebMvcConfigurer {@Autowiredprivate CorsInterceptor corsInterceptor;@Overridepublic void addInterceptors(InterceptorRegistry registry) {//跨域拦截器需放在最上面registry.addInterceptor(corsInterceptor);}
}

 

再次访问接口，请求正常返回了

参考链接：

「日常报错」Response to preflight request doesn't pass access control check: It does not have HTTP ok status. - Posase - 博客园 (cnblogs.com)

为什么出现OPTIONS？SpringBoot接口跨域解决方案 - 简书 (jianshu.com)