java后端解决跨域问题

新建一个filter

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", "*");
            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 {  

    }  

} 

另外web.xml中增加如下配置

<filter>
      <filter-name>cors</filter-name>
      <filter-class>com.pillow.web.filter.SimpleCORSFilter</filter-class>
    </filter>
    <filter-mapping>
      <filter-name>cors</filter-name>
      <url-pattern>/*</url-pattern>
    </filter-mapping> 

http://hw1287789687.iteye.com/blog/2212292