java跨越访问

java跨越访问
https://blog.csdn.net/lovePaul77/article/details/85681404

1. 写一个class，配置的class

   package com.example.demo;
    
   import org.springframework.context.annotation.Bean;
   import org.springframework.context.annotation.Configuration;
   import org.springframework.web.cors.CorsConfiguration;
   import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
   import org.springframework.web.filter.CorsFilter;
   
   @Configuration
   public class CorsConfig {
    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        return corsConfiguration;
    }
    
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        // 配置所有请求
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }
   }

   2.在你要访问的Controller的方法上面加上注解

   @CrossOrigin

   搞定，不会有跨越的报错了。