jsonp跨域問題解決

ajax接口調用過程當中常常會遇到json跨域問題，解決方法以下：

[****jsonp方式暫不使用****]

1.使用getScript方式解決

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

console.log(remote_ip_info.city);

});

 

2.從服務器端解決（新增自定義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新增過濾器配置

 

<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容器加載過濾器 applicationContext.xml  （可選，須要注入屬性的時候配置。這裏能夠不用配置）

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