配置一个CROS的模板类，暂且不考虑其中的原理，我也不会咯。

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package com.zfxt.sjv.config;


import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @author:zfx-t
 * @version:1.0
 */
@Configuration
public class CrosConfiguration implements WebMvcConfigurer {
    /**
     * 允许跨域调用的过滤器
     */
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOriginPatterns("*")
                .allowedMethods("GET", "PUT", "POST", "DELETE", "HEAD", "OPTIONS")
                .allowCredentials(true)
                .maxAge(3600)
                .allowedHeaders("*");
    }
}