！！！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("*"); } }
