//请求转发
<%
request.getRequestDispatcher("/WEB-INF/pages/index.jsp").forward(request, response);
%>
//重定向
res.sendRedirect(req.getContextPath() + "/login.html"); return;
//response
res.setCharacterEncoding("utf-8");
res.setContentType("text/html;charset=UTF-8");
OutputStream out = res.getOutputStream();
PrintWriter pw = new PrintWriter(new OutputStreamWriter(out,"utf-8"));
pw.println("{\"result\":false,\"errorMessage\":\"http session is timeout,please login again\"}");
pw.flush();
pw.close();
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = null;
try {
pw = response.getWriter();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(pw != null) {
pw.print("{\"result\":false,\"errorMessage\":\"http session is timeout,please login again\"}");
pw.close();
}
}
//html自动跳转
<html>
<head>
<meta http-equiv="refresh" content="0;url="http://www.baidu.com">
<!--0是等待时间，如果设置为5表示等待5s后开始跳转 -->
</head>
//js
window.location.replace("http://www.baidu.com"); //无历史记录
window.location="url"; //有历史记录
self.location='top.htm';
top.location='xx.jsp';
<a href="javascript:history.go(-1)">返回上一步</a>
<a href="javascript:history.back()">返回上一步</a>