如何让服务器支持跨域呢?

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:

Java代码  

1. package com.web.filter;  
2.   
3. import java.io.IOException;  
4.   
5. import javax.servlet.Filter;  
6. import javax.servlet.FilterChain;  
7. import javax.servlet.FilterConfig;  
8. import javax.servlet.ServletException;  
9. import javax.servlet.ServletRequest;  
10. import javax.servlet.ServletResponse;  
11. import javax.servlet.http.HttpServletResponse;  
12.   
13. import com.common.dict.Constant2;  
14.   
15. import oa.service.DictionaryParam;  
16.   
17. public class SimpleCORSFilter implements Filter{  
18.   
19.     @Override  
20.     public void destroy() {  
21.           
22.     }  
23.   
24.     @Override  
25.     public void doFilter(ServletRequest req, ServletResponse res,  
26.             FilterChain chain) throws IOException, ServletException {  
27.             HttpServletResponse response = (HttpServletResponse) res;  
28.             response.setHeader("Access-Control-Allow-Origin", DictionaryParam.get(Constant2.DICTIONARY_GROUP_GLOBAL_SETTING, "AccessControlAllowOrigin"));  
29.             response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");  
30.             response.setHeader("Access-Control-Max-Age", "3600");  
31.             response.setHeader("Access-Control-Allow-Headers", "x-requested-with");  
32.             chain.doFilter(req, res);  
33.           
34.     }  
35.   
36.     @Override  
37.     public void init(FilterConfig arg0) throws ServletException {  
38.           
39.     }  
40.   
41. }  

关键代码:response.setHeader("Access-Control-Allow-Origin", "*");

 修改web.xml,增加:

Xml代码  

1. <filter>  
2.       <filter-name>cors</filter-name>  
3.       <filter-class>com.web.filter.SimpleCORSFilter</filter-class>  
4.     </filter>  
5.     <filter-mapping>  
6.       <filter-name>cors</filter-name>  
7.       <url-pattern>/*</url-pattern>  
8.     </filter-mapping>  

这样服务器就支持ajax的跨域访问了.