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:

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.