SpringBoot: 全局跨域配置

一、可以在配置类中通过配置一个@Bean,直接实现全局的跨域，不需要在每个controller上加@CrossOrigin注解了。

package cn.edu.tju.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration(proxyBeanMethods = false)
public class MyCorsConfig {
    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("


        try {
            OutputStream os = response.getOutputStream();
            ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
            response.setHeader("Content-Length", String.valueOf(bais.available()));
            byte[] b = new byte[1024];
            while ((bais.read(b)) > 0) {
                os.write(b);
            }
            bais.close();
            os.flush();
            os.close();
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }