错误

使用request进行请求转发后无效，并没有跳转页面。

错误代码

@WebServlet("/testServlet")
public class TestServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getRequestDispatcher("/login.sjp");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }
}

原因

犯了一个细节错误，request.getRequestDispatcher("跳转地址").forward(request,response);应该是这样的，而我的并没有后面的".forward(request,response)"，并没有传过去。

解决

使用正确完整的跳转代码request.getRequestDispatcher("跳转地址").forward(request,response);

正确代码

@WebServlet("/testServlet")
public class TestServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getRequestDispatcher("/login.sjp").forward(request,response);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }
}