核心代码：方法参数要有response
response.setContextType("text/html;charset=UTF-8");
PrintWrite out = response.getWrite();
out.write("<script type=‘text/javascript‘>alert(‘这是一个弹出框!‘);window.close();</script>");
out.flush();
out.close();
原文：http://www.cnblogs.com/wxm-bk/p/7381936.html