getOutputStream() has already been called for this response 当前响应已经调用了方法getOutputStream() 如果遇到这个问题,一般是将图片输出代码直接下载jsp中,而没有写在Java类中,解决办法: session.setAttribute("random",sRand); g.dispose(); ImageIO.wr
亲测可用,若有疑问请私信 function is_weixin(){ var ua = navigator.userAgent.toLowerCase(); if(ua.match(/MicroMessenger/i)=="micromessenger") {return true;} else {return false;} }