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[JSP] 实现请求转发

2011-07-30 12:10 330 查看

在服务器端对客户端请求时行转发对其它的对象,如果jsp网页或Servlet

用三个 jsp网页来演示转发:

forword1.jsp, 用来提交表单, 将表单内容提交给 forwrod2.jsp, forward1.jsp代码如下:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Forward1</title>
</head>
<body>
<h1>Forward1</h1>
<form action="forward2.jsp">
姓名: <input type="text" name="username"/>
<input type="submit" name="submit" value="提交"/>
</form>
</body>
</html>

forward2.jsp 功能是将客户端的请求的内容转发给forward3.jsp, 然后将网页forward3.jsp返回给客户端, forward2.jsp的代码如下:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Forward2</title>
</head>
<body>
<h1>Forward2</h1>
<%
RequestDispatcher rd = request.getRequestDispatcher("forward3.jsp");
            rd.forward(request, response); 
%>
</body>
</html>

forward3.jsp是用来返回给客户端的, 代码如下:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Forward3</title>
</head>
<body>
<h1>Forward3</h1>
<%
String username = request.getParameter("username");
%>
用户名为: <%=username %>
</body>
</html>

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