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Access to XMLHttpRequest at'http://localhost出现这样的跨域限制问题，解决方案如下:

1.在后端添加过滤器

package com.jack.design_competition.config;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletResponse;@WebFilter("/*")public class CorsFilter implements Filter {
       @Override    public void doFilter(ServletRequest request, ServletResponse resp, FilterChain chain) throws IOException, ServletException    {
           HttpServletResponse response = (HttpServletResponse) resp; response.setHeader("Access-Control-Allow-Origin", "*"); //解决跨域访问报错        response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");        response.setHeader("Access-Control-Max-Age", "3600"); //设置过期时间        response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, client_id, uuid, Authorization");        response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // 支持HTTP 1.1.        response.setHeader("Pragma", "no-cache"); // 支持HTTP 1.0. response.setHeader("Expires", "0");        chain.doFilter(request, resp);    }    @Override    public void init(FilterConfig filterConfig) {
   }    @Override    public void destroy() {
   }}

2.再Appliacation上添加注解@ServletComponentScan

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