[JSP] 实现请求转发

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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