jsonp跨域问题解决

ajax接口调用过程当中常常会遇到json跨域问题，解决方法以下：

[****jsonp方式暂不使用****]

1.使用getScript方式解决

$.getScript('http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js',function(){

console.log(remote_ip_info.city);

});

 

2.从服务器端解决（新增自定义filter）

<1> CORSFilter.java

public class CORSFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        /*
        Access-Control-Allow-Headers: Origin, X-Atmosphere-tracking-id, X-Atmosphere-Framework, X-Cache-Date, Content-Type, X-Atmosphere-Transport, *
        Access-Control-Allow-Methods: POST, GET, OPTIONS , PUT
        Access-Control-Allow-Origin: *
        Access-Control-Request-Headers: Origin, X-Atmosphere-tracking-id, X-Atmosphere-Framework, X-Cache-Date, Content-Type, X-Atmosphere-Transport,*
        */
        ((HttpServletResponse)response).setHeader("Access-Control-Allow-Headers", "Origin, X-Atmosphere-tracking-id, X-Atmosphere-Framework, X-Cache-Date, Content-Type, X-Atmosphere-Transport, *");
//        ((HttpServletResponse)response).setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS , PUT");
        ((HttpServletResponse)response).setHeader("Access-Control-Allow-Origin", "*");
//        ((HttpServletResponse)response).setHeader("Access-Control-Request-Headers", "Origin, X-Atmosphere-tracking-id, X-Atmosphere-Framework, X-Cache-Date, Content-Type, X-Atmosphere-Transport,*");
//        ((HttpServletResponse)response).setContentType("application/json");
//        ((HttpServletResponse)response).setHeader("Connection", "keep-alive");
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {

    }
}

<2>web.xml新增过滤器配置

 

<filter>
    <filter-name>CORSFilter</filter-name>
    <filter-class>com.chuyan.common.filter.CORSFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>CORSFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

<3>spring容器加载过滤器 applicationContext.xml  （可选，须要注入属性的时候配置。这里能够不用配置）

<bean id="CORSFilter" class="com.chuyan.common.filter.CORSFilter"/>