java 前后端跨域问题解决

 前端页面部署在nginx 上 ，后端代码部署在服务器上 ，前端访问后台会出现跨域问题

 

新建一个过滤器

/**
 * 开放跨域权限
 *
 * */
@Slf4j
public class testFilter implements Filter {

    public void init(FilterConfig filterConfig) throws ServletException {
    }

    public void doFilter(ServletRequest var1, ServletResponse var2, FilterChain var3) throws IOException, ServletException{

        // System.out.println("执行过滤操作");

        HttpServletResponse response = (HttpServletResponse) var2;

        response.setHeader("Access-Control-Allow-Origin", "*");

        response.setHeader("Access-Control-Allow-Headers",
                "User-Agent,Origin,Cache-Control,Content-type,Date,Server,withCredentials,AccessToken");

        response.setHeader("Access-Control-Allow-Credentials", "true");

        response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, HEAD");

        response.setHeader("Access-Control-Max-Age", "1209600");

        response.setHeader("Access-Control-Expose-Headers", "accesstoken");

        response.setHeader("Access-Control-Request-Headers", "accesstoken");

        response.setHeader("Expires", "-1");

        response.setHeader("Cache-Control", "no-cache");

        response.setHeader("pragma", "no-cache");

        var3.doFilter(var1, response);
    };

    public void destroy() {
    }
}

在配置文件中配置filter

@Bean
public FilterRegistrationBean filterRegist() {
    FilterRegistrationBean frBean = new FilterRegistrationBean();
    frBean.setFilter(new testFilter());
    frBean.addUrlPatterns("/*");


    return frBean;
}

前端页面 ajax 中添加
xhrFields: {
  withCredentials: true
},属性