//解决GET提交乱码

String s=new String(user.getUsername()[0].getBytes("iso8859-1"),"UTF-8");

 

//解决POST提交乱码

request.setCharacterEncoding("UTF-8");

 

servlet中赋值

request.setAttribute("data", "hello");

request.getRequestDispatcher("/index.jsp").forward(request, response);

 

index.jsp 中取值

<form>

<%

String data = (String) request.getAttribute("data");

out.write(data);

%>

</form>

 

//包含页面

request.getRequestDispatcher("/index.jsp").include(request, response);

response.getWriter().write("12");

request.getRequestDispatcher("/index.jsp").include(request, response);

 

//通过referer防盗链

String referer = request.getHeader("referer");