Springboot后台设置允许跨域的方法

1、在启动类中继承WebMvcConfigurerAdapter，重写其中的addCorsMappings方法

package com.example.springbootdemo;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 
@SpringBootApplication
public class SpringbootdemoApplication extends WebMvcConfigurerAdapter {
	public static void main(String[] args) {
		SpringApplication.run(SpringbootdemoApplication.class, args);
	}
	@Override
	public void addCorsMappings(CorsRegistry registry) {
 
		registry.addMapping("/**")
				.allowCredentials(true)
				.allowedHeaders("*")
				.allowedOrigins("*")
				.allowedMethods("*");
	}
}

2、在允许跨域请求的controller中使用@CrossOrigin 注解

import org.springframework.web.bind.annotation.CrossOrigin;
@CrossOrigin
@RestController
public class HelloWorldController {

}