在servlet里
PrintWriter out = response.getWriter()
从HttpServletResponse中get一个PrintWriter,取一个响应客户端的流对象
打个通俗的比方就是通过HttpServletResponse对象得到一支笔，然后就可以用out.print()方法在网页上写任何你想显示的内容。
out.print("<html><body>");
out.print("任何内容");
out.print("</body></html>");
通过PrintWrite，以流方式输出html，返回给客户端，显示在IE上。
最后 out.close(); 关闭流
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