页面报错： Failed to load http://localhost:8080/websites/webInterface/queryNewsList: Response to preflight request doesn‘t pass access control check: No ‘Access-Control-Allow-Origin‘ header is present on the requested resource. Origin ‘http://127.0.0.1:8020‘ is therefore not allowed access.
package com.xxx.websites.commons.filter;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.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.httpclient.HttpStatus;/** * ?* @ClassName:CorsFilter * @Description:TODO(统一处理跨域请求) * @author: xxx * @date 2018年7月4日 上午11:11:19 * * @Copyright: 2018 www.zsplat.com Inc. All rights reserved. */public class CorsFilter implements Filter { ???@Override ???public void init(FilterConfig filterConfig) throws ServletException { ???} ???@Override ???public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) ???????????throws IOException, ServletException { ???????HttpServletResponse _response = (HttpServletResponse) response; ???????HttpServletRequest _request = (HttpServletRequest) request; ???????// 指定允许其他域名访问 ???????_response.setHeader("Access-Control-Allow-Origin", "*"); ???????// 响应类型 ???????_response.setHeader("Access-Control-Allow-Methods", "POST, GET, DELETE, OPTIONS, DELETE"); ???????// 响应头设置 ???????_response.setHeader("Access-Control-Allow-Headers", "Content-Type, x-requested-with, X-Custom-Header, HaiYi-Access-Token"); ???????if ("OPTIONS".equals(_request.getMethod())){ ???????????_response.setStatus(HttpStatus.SC_NO_CONTENT); ???????} ???????chain.doFilter(request, response); ???} ???@Override ???public void destroy() { ???}}
web.xml中配置
<!-- 跨域拦截器 --> ???<filter> ???????<filter-name>cors</filter-name> ???????<filter-class>com.zsplat.websites.commons.filter.CorsFilter</filter-class> ???</filter> ???<filter-mapping> ???????<filter-name>cors</filter-name> ???????<url-pattern>/*</url-pattern> ???</filter-mapping> ???<!-- 跨域拦截器 -->
Ajax跨域后台处理
原文地址：https://www.cnblogs.com/zhou-pan/p/9274490.html