使用RequestDispatcher发送变量值时出现java问题

Question

在变量search_for中，我得到了正在搜索的值的字符串值。但我无法通过RequestDispatcher将其传递给jsp。我做错了什么

RequestDispatcher rd = request.getRequestDispatcher("my.jsp?search_for"); 

Answer 1

问题1：

request.setAttribute("paramName", search_for);
RequestDispatcher rd = request.getRequestDispatcher("my.jsp");
rd.forward(request, response);

或

问题2：

RequestDispatcher rd = request.getRequestDispatcher("my.jsp?paramName="+search_for);
rd.forward(request, response);