为何jsp不能跳转
日期：2014-05-17 浏览次数：20739 次
为什么jsp不能跳转
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%@ page language="java" contentType="text/html; charset=utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="net.taobaoge.entity.*"%>
<%@ page import="net.taobaoge.dao.*"%>
<%@ page import="net.taobaoge.dao.impl.*"%>
<html>
<head>
<script type="text/javascript">
function returnPage(){
alert(123);
window.location.href="register.jsp";
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>doForm.jsp</title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
String userName = request.getParameter("userName");
String password = request.getParameter("password");
String sex = request.getParameter("sex");
String habby1 = request.getParameter("checkbox1");
String habby2 = request.getParameter("checkbox2");
String habby3 = request.getParameter("checkbox3");
String address = request.getParameter("addressList");
String resume = request.getParameter("resume");
InformationDAO dao = new InformationDAOImpl();
Information entity = new Information(userName, password, sex,
habby1, habby2, habby3, address, resume);
boolean flg = dao.hasRegister(entity);
if (!flg) {
//这里我需要实现弹出对话框，并跳转页面，但是现在无法弹出对话框，
//如果把下面的request.getRequestDispatcher(),去掉就可以出来对话框，这是为什么？如何解决！！！！
String outt = "<script type=\"text/javascript\">alert(\"用户名已经被注册过，请重新注册！\");</script>";
out.println(outt);
request.getRequestDispatcher("register.jsp").forward(request,
response);
} else {
dao.insertOneMsg(entity);
String outt = "<script type=\"text/javascript\">alert(\"注册成功\");</script>";
out.println(outt);
request.getRequestDispatcher("register.jsp").forward(request,
response);
}
%>
</body>
</html>
------解决方案--------------------
out.println(outt);
request.getRequestDispatcher("register.jsp").forward(request,
response);
后面加上return;
------解决方案--------------------
out.println 之后就不能再转发请求了。
------解决方案--------------------
试试response.setHeader("refresh", "2;url=");
url后面自己填. 2代表2秒跳转
------解决方案--------------------
在Servlet中有倆中跳转
啊 你在这用了重定向 所以弹不出提示框！
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%@ page language="java" contentType="text/html; charset=utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="net.taobaoge.entity.*"%>
<%@ page import="net.taobaoge.dao.*"%>
<%@ page import="net.taobaoge.dao.impl.*"%>
<html>
<head>
<script type="text/javascript">
function returnPage(){
alert(123);
window.location.href="register.jsp";
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>doForm.jsp</title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
String userName = request.getParameter("userName");
String password = request.getParameter("password");
String sex = request.getParameter("sex");
String habby1 = request.getParameter("checkbox1");
String habby2 = request.getParameter("checkbox2");
String habby3 = request.getParameter("checkbox3");
String address = request.getParameter("addressList");
String resume = request.getParameter("resume");
InformationDAO dao = new InformationDAOImpl();
Information entity = new Information(userName, password, sex,
habby1, habby2, habby3, address, resume);
boolean flg = dao.hasRegister(entity);
if (!flg) {
//这里我需要实现弹出对话框，并跳转页面，但是现在无法弹出对话框，
//如果把下面的request.getRequestDispatcher(),去掉就可以出来对话框，这是为什么？如何解决！！！！
String outt = "<script type=\"text/javascript\">alert(\"用户名已经被注册过，请重新注册！\");</script>";
out.println(outt);
request.getRequestDispatcher("register.jsp").forward(request,
response);
} else {
dao.insertOneMsg(entity);
String outt = "<script type=\"text/javascript\">alert(\"注册成功\");</script>";
out.println(outt);
request.getRequestDispatcher("register.jsp").forward(request,
response);
}
%>
</body>
</html>
------解决方案--------------------
out.println(outt);
request.getRequestDispatcher("register.jsp").forward(request,
response);
后面加上return;
------解决方案--------------------
out.println 之后就不能再转发请求了。
------解决方案--------------------
试试response.setHeader("refresh", "2;url=");
url后面自己填. 2代表2秒跳转
------解决方案--------------------
在Servlet中有倆中跳转
啊 你在这用了重定向 所以弹不出提示框！
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