1.引入库

代码如下（示例）：

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

2.解决跨域

代码如下（示例）：

/**
 * @author yuqz
 * @date 2021年9月24日
 * @Desc 解决跨域问题
 */
@Component
public class CorsFilter implements Filter {
    
    

    @Override
    public void init(FilterConfig filterConfig){
    
    

    }

    @Override
    public void doFilter(ServletRequest request, 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, OPTIONS");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Content-Type, x-requested-with, access_token,activityId");
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
    
    

    }
}