如何让服务器支持跨域

要看服务器类型，如果服务器是apache(1)修改http服务的配置文件:C:\wamp\bin\apache\Apache2.4.4\conf\httpd.conf把LoadModule headers_module modules/mod_headers.so 前面的注释删除.(2)添加Header set Access-Control-Allow-Origin *<Directory />    AllowOverride none    Require all granted         Header set Access-Control-Allow-Origin *</Directory>(3)重启http服务如果是tomcat,比如spring MVC项目创建一个过滤器,代码如下:Java代码  收藏代码package com.web.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.HttpServletResponse;    import com.common.dict.Constant2;    import oa.service.DictionaryParam;    public class SimpleCORSFilter implements Filter{        @Override      public void destroy() {                }        @Override      public void doFilter(ServletRequest req, ServletResponse res,              FilterChain chain) throws IOException, ServletException {              HttpServletResponse response = (HttpServletResponse) res;              response.setHeader("Access-Control-Allow-Origin", DictionaryParam.get(Constant2.DICTIONARY_GROUP_GLOBAL_SETTING, "AccessControlAllowOrigin"));              response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");              response.setHeader("Access-Control-Max-Age", "3600");              response.setHeader("Access-Control-Allow-Headers", "x-requested-with");              chain.doFilter(req, res);                }        @Override      public void init(FilterConfig arg0) throws ServletException {                }    }  关键代码:response.setHeader("Access-Control-Allow-Origin", "*"); <filter>        <filter-name>cors</filter-name>        <filter-class>com.web.filter.SimpleCORSFilter</filter-class>      </filter>      <filter-mapping>        <filter-name>cors</filter-name>        <url-pattern>/*</url-pattern>      </filter-mapping>   这样服务器就支持ajax的跨域访问了.