Servlet | Request request forwarding and resource sharing

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1. Request forwarding

Request forwarding is an 服务器内部existing resource jump method

step:

1. requestGet request forwarder object through object:

   RequestDispatcher getRequestDispatcher(String path); 
   

2. Use RequestDispatcherobjects to forward:

   forward(ServletRequest request,ServletResponse response);
   

Generally use chain programming to write directly into one line:

request.getRequestDispatcher(String path).forward(request,response);

Features:

• Request forwarding browser address bar path does not change
• Can only be forwarded to the internal resources of the current server
• Forwarding is a request

2. Sharing resources

Domain object: an object with a scope that can share data within the scope

requestDomain: Represents the scope of a request, and is generally used to share data among multiple resources requested for forwarding

method:

• void setAttribute(String name,Object obj):Storing data
• Object getAttribute(String name): Get value by key
• void romoveAttribute(String name): Remove key-value pairs by key