从一个Web应用程序重定向到另一个Web应用程序时如何传递数据？

Question

I have two web application which are deployed in the same J2EE Application server. I need to redirect from one web application to another. Also I need to set some information in the Header from web application 1 so that it is available in web application 2. When I try to access the information which set in the header of Web App1 in Web App2, I'm getting "null". I'm using response.sendRedirect("http://localhost/webapp2") in Web Application 1 to redirect. Please help me to solve this.

Thanks, Apps.

Answer 1

A redirect is processed by the client (the browser). So only the client gets the headers you sent. The headers will not be passed to the webapp redirected to.

You can do one of the following things to pass information from one webapp to another:

• pass data as request parameter
• send data as cookie without path restriction
• use cross context dispatching

A cookie received by the client will be send back to the server. The client does not know it is a different webapp. You just need to set the cookie path to / .

Cross context dispacthing is done by an internal forward in the container (use a RequestDispatcher from the ServletContext). The client will never know, the request is handled by another webapp. You than can set a request attribute to pass data. Cross context dispatching has to be enabled by the container for security reasons.

Answer 2

You could send the information as URL parameters.

Redirect to http://localhost/webapp2?param1=value1&param2=value2 ....

Answer 3

其中一个选项是将简单的传递信息作为您在sendRedirect调用中使用的URL中的GET属性。