request的setAttribute()怎么用的?

JSP1代码

String [] test=new String[2];

test[0]="1";

test[1]="2";

request.setAttribute("test",test);

response.sendRedirect("jsp2.jsp");

JSP2代码

String test[]=(String[])request.getAttribute("test");

out.print(test);

为什么JSP2中会找不到test?