第一种 通过注解 @CrossOrigin(origins = "*", maxAge = 3600)

import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RestController;


@RestController
@CrossOrigin(origins = "*", maxAge = 3600)
public class FileController {


}

第二种 Filter 方式

import javax.servlet.*;  
import javax.servlet.http.HttpServletResponse;  
import java.io.IOException;  
   
@Component  
public class CorsFilter implements Filter {  
  
    final static org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CorsFilter.class);  
 
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {  
        HttpServletResponse response = (HttpServletResponse) res;  
        response.setHeader("Access-Control-Allow-Origin", "*");  
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT,OPTIONS, DELETE");  
        response.setHeader("Access-Control-Max-Age", "3600");  
        response.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");  
        chain.doFilter(req, res);  
    }  
    public void init(FilterConfig filterConfig) {}  
    public void destroy() {}  
}  

第三种 CorsConfig

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;

/***
 * 跨域设置
 */
@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();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }
}