Web、SpringMvc，Servlet相关

一、设置跨域

response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Cache-Control","no-cache");

注，使用Response.reset的时候会把跨域重置。失效

SpringBoot可以添加下面注解实现跨域

@CrossOrigin

二、输出流

response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
OutputStream ops = response.getOutputStream();
ops.write();