How javaWeb forward data, how jsp page to receive?

1. scenario demonstrates

　　Now there is a demand: the request reached the server, the server needs the requested data to another page, how to achieve?　　

2. Objectives Analysis

　　Jump to page through the server, implemented in two ways: one is forwarding a redirect.

　　We know that can carry forward the data, redirect and can not carry data, so, in order to carry data jump page, must be forwarded to achieve.

3. Solution

　　Page value by the getAttribute (); by setAttribute () value is passed to the page request object.

　　Request address

　　http://localhost:8070/demo2/dispatcher.do?userName=%25E7%2594%25A8%25E6%2588%25B7%25E5%2590%258D&password=pwd

// tells the browser to utf-8 character set to resolve success.jsp 
response.setCharacterEncoding ( "utf-8"); 
// username 
String userName = request.getParameter ( "userName"); 
// Tomcat server, automatic decoding time, there need to decode one (userName total encoded twice) 
userName = URLDecoder.decode (userName, "UTF-8"); 
// password 
String = request.getParameter password ( "password"); 
// forward What to bring when page data 
request.setAttribute ( "userName", userName); 
request.setAttribute ( "password", password); 
// Jump to success.jsp (browser's address bar does not change) 
request.getRequestDispatcher ( "/success.jsp").forward(request, response);

　　The value of a page in two ways:

　　1. expression obtained by the EL;

$ {Name} properties

　　2. Get through a small script.

<% = Request.getAttribute ( "attribute name")%>

4. Effects show

　　Description:

　　Page by means of the value of the request object, can only be achieved in the jsp, because: a servlet jsp nature, and belongs to the servlet java language, so you can use jsp direct request object, and then be able to value.

　　Accordingly, if you are forwarding a html file, then sorry, you will not be able to get the data request objects carried.