How to forward Servlet

Servlet forwarding steps: first bind the data to the request object; then obtain the forwarder; finally, in the forwarded destination component, obtain the binding value based on the binding name, if the corresponding value does not exist , just return null.

Forwarding is when a web component (servlet/jsp) passes the unfinished processing to another web component through the container for further completion.

Generally, after a servlet obtains the data, it forwards it to a jsp, and the jsp generates the corresponding page based on the data.

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How does Servlet forward?

step1. Bind the data to the request object.

request.setAttribute(String name,Object obj);

For example:

request.setAttribute("emplist",emplist);

step2. Obtain the forwarder

RequestDispatcher rd = request.getRequestDispatcher(String uri);

uri: It is the destination component to be forwarded

For example:

RequestDispatcher rd = request.getRequestDispatcher("empList3.jsp");

step3. Forwarding

rd.forward(request,response);

In the forwarded destination component, the binding value can be obtained based on the binding name. If the corresponding value is not exists, returns null.

Object request.getAttribute(String name);

Problems that need attention when forwarding

Out.close and out.flush cannot be called before forwarding.

Before forwarding, the container will clear the cached data on the response object.

Forwarding features

After forwarding, the address in the browser address bar remains unchanged.

The forwarding destination can only be the address of a component within the same application.

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