拦截器返回数据
// 获得response
HttpServletResponse httpResponse = (HttpServletResponse) response;
// 服务器允许发送cookie
httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
// 允许接收请求的域名
httpResponse.setHeader("Access-Control-Allow-Origin", "http://localhost:8081");
// 设置UTF-8编码
httpResponse.setCharacterEncoding("UTF-8");
response.setContentType("application/json;charset=utf-8");
// 将数据写回浏览器
httpResponse.getWriter().print("登陆失败");
属性详解
// 表示允许接收请求的域名
response.setHeader("Access-Control-Allow-Origin", "http://localhost:8081");
// 支持的所有跨域请求的方法
response.setHeader("Access-Control-Allow-Methods", "POST,OPTIONS,GET");
// 本次预检请求的有效期
response.setHeader("Access-Control-Max-Age", "3600");
// 在Header里自定义字段
response.setHeader("Access-Control-Allow-Headers", "accept,x-requested-with,Content-Type");
// 服务器允许发送cookie
response.setHeader("Access-Control-Allow-Credentials", "true");
