如何让服务器本身支持跨域请求呢?
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:
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", "*");
修改web.xml,增加:
<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.