javascript代码

<script language="javascript">
window.location = "http://www.baidu.com";
</script>

或者

<script language="javascript">
document.location = "http://www.baidu.com";
</script>

php代码

<?php
header("location: http://www.baidu.com");
?>

Servlet中的跳转

RequestDispatcher rd = request.getRequestDispatcher(request.getContextPath() + "/jump_target.jsp");
rd.forward(request, response);