完美解决Spring Boot前端的Access-Control-Allow-Origin跨域问题

当我们在做前后端分离的开发时，在使用fetch交换数据的时候，提示Access-Control-Allow-Origin跨域问题，解决方案跟客户端没关系，修改的是服务端。

一、在过滤器中设置响应头：

@WebFilter(filterName = "CorsFilter ")
public class CorsFilter implements Filter {
   @Override
   public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
       HttpServletResponse response = (HttpServletResponse) res;
       HttpServletRequest reqs = (HttpServletRequest) req;
       // response.setHeader("Access-Control-Allow-Origin",reqs.getHeader("Origin"));
       response.setHeader("Access-Control-Allow-Origin","*");
       response.setHeader("Access-Control-Allow-Credentials", "true");
       response.setHeader("Access-Control-Allow-Methods", "POST, GET, PATCH, DELETE, PUT");
       response.setHeader("Access-Control-Max-Age", "3600");
       response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
       chain.doFilter(req, res);
   }
   @Override
   public void init(FilterConfig filterConfig) {}
   @Override
   public void destroy() {}
}

二、在spring boot 服务中心添加一个配置文件：

@Configuration
public class CorsConfig extends WebMvcConfigurerAdapter {
@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/**").allowedOrigins("*")
.allowedMethods("GET", "HEAD", "POST","PUT", "DELETE", "OPTIONS")
.allowCredentials(true).maxAge(3600);
}
}

来源：https://blog.csdn.net/tiangongkaiwu152368/article/details/81099169