give me meanging of above things [closed]

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meaning of request.getSession().setAttribute(),response.setHeader("Content-Disposition", "attachment;filename=\"Destination.csv\"");,response.getOutputStream();,out.println(开发者_如何学JAVA) and why use request.getSession().setAttribute()

my code for related it is request.getSession().setAttribute("lcrConfigProductionRelData",lcrConfigProductionRelData); lcrConfigProductionRelData is collection and this code present in jsp and it access in servlet servletCode is (httpSession.getAttribute("lcrConfigProductionRelData");

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• request.getSession() returns the session.

• .setAttribute("lcrConfigProductionRelData",lcrConfigProductionRelData); sets the field with the given name to the given value.

• response.setHeader("Content-Disposition", "attachment;filename=\"Destination.csv\""); sends a HTTP header causing the user's to show a download window with a file name "Destination.csv

The session attribute is set so it can be accessed somewhere else just through its name without direct access to the original variable.