spring boot配置cors解决前后端跨域

新增corsConfig，详细代码如下：

@Configuration
public Class CorsConfig{
	@Bean
	Public FilterRegistrationBean corsFilter(){
		CorsConfiguration config=new CorsConfiguration();
		config.setAllowCredentials(true);
		config.addAllowedOrigin("*");
		config.addAllowedHeader("*");
		config.addAllowedMethod("*");
		config.setMaxAge(3600L);
		config.addExposedHeader("Content-Type");
		config.addExposedHeader("X-Requested-With");
		config.addExposedHeader("accept");
		config.addExposedHeader("Origin");
		config.addExposedHeader("Access-Control-Request-Method");
		config.addExposedHeader("Access-Control-Request-Headers");
		UrlBasedCorsConfigurationSource configSource= new UrlBasedCorsConfigurationSource();
		configSource.registerCorsConfiguration("/**", config);
		FilterRegistrationBean bean =new FilterRegistrationBean<>(new CorsFilter(configSource));
		//设置过滤器的优先级
		bean.setOrder(0);
		return bean;
	}
}

原因可能是因为 打jar包时shiro拦截器拦截http请求的预检请求，导致跨域发生，所以我们设置了cors的级别高于shiro，避免了拦截预检请求发生。