建设通是什么网站/seo是什么职位缩写

当前端页面与后台运行在不同的服务器时，就必定会出现跨域这一问题，本篇简单介绍解决跨域的一种常用方案

1、错误如图，前端请求后台报错

2、Java后台添加Filter解决，代码如下

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.HttpServletResponse;public class WebContentFilter implements Filter {@Overridepublic void destroy() {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)throws IOException, ServletException {HttpServletResponse httpServletResponse=(HttpServletResponse) response;httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");httpServletResponse.setHeader("Access-Control-Allow-Headers", "Authentication");chain.doFilter(request, httpServletResponse);}@Overridepublic void init(FilterConfig arg0) throws ServletException {}}

3、web.xml添加配置项

web.xml配置：<!-- 跨域 --><filter><filter-name>ContentFilter</filter-name><filter-class>com.xxx.xxx.WebContentFilter</filter-class></filter><filter-mapping><filter-name>ContentFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>

配置完重启项目访问即可。