关键代码（在springboot1.5中不加这一块也是正常的，不知道为什么2.0就出现了这个问题）

@Bean
    public HttpPutFormContentFilter httpPutFormContentFilter() {
        return new HttpPutFormContentFilter();
    }

 完整代码

@Configuration
@EnableWebMvc
public class MyWebMvcConfigurer implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        //设置允许跨域的路径
        registry.addMapping("/**")
                //是否允许证书 不再默认开启
                .allowCredentials(true)
                .allowedOrigins("*")
                .allowedMethods("*")
                .allowedHeaders("*");
                //跨域允许时间
//                .maxAge(3600);
    }

    private CorsConfiguration addCorsConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        List<String> list = new ArrayList<>();
        list.add("*");
        corsConfiguration.setAllowedOrigins(list);
        //请求常用的三种配置，*代表允许所有，当时你也可以自定义属性（比如header只能带什么，只能是post方式等等）
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        return corsConfiguration;
    }

    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", addCorsConfig());
        return new CorsFilter(source);
    }

    @Bean
    public HttpPutFormContentFilter httpPutFormContentFilter() {
        return new HttpPutFormContentFilter();
    }

}