cors 跨域 总结(原创)
一，简单跨域（不带头 不带参数）? ? ? ?要在servlet的doget或者dopost里增加返回头? ? ? ?resp.addHeader("Access-Control-Allow-Origin","http://zhucetest.duapp.com"); ? ?如果是公共的则返回*即可。二，复杂跨域? ? ? 浏览器会先发起一个验证的网络连接到servlet的?doOptions ? 在doOptions里返回resp.addHeader("Access-Control-Allow-Origin","http://zhucetest.duapp.com");resp.addHeader("Access-Control-Allow-Methods","GET,POST,OPTIONS");?resp.addHeader("Access-Control-Allow-Headers", "Content-type,hello");?resp.addHeader("Access-Control-Max-Age", "50");?? ? ? ? 即可三，post传参 ? 加这句话? ? ? ?xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");?四，get传参 ?直接加在url里五，servelet接受参数?? ? ? ?直接调用req.getparams...?下面是例子?public class TestOut extends HttpServlet {?@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {?resp.addHeader("Access-Control-Allow-Origin","http://zhucetest.duapp.com");??}?@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {?resp.addHeader("Access-Control-Allow-Origin","http://zhucetest.duapp.com");??}@Overrideprotected void doOptions(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {?resp.addHeader("Access-Control-Allow-Origin","http://zhucetest.duapp.com");resp.addHeader("Access-Control-Allow-Methods","GET,POST,OPTIONS");?resp.addHeader("Access-Control-Allow-Headers", "Content-type,hello");?resp.addHeader("Access-Control-Max-Age", "50");}?}
?
