[java]

Index.jsp

<a href="servlet/HelloServlet">servlet/HelloServlet</a><br>

<a href="<%=request.getContextPath() %>/servlet/HelloServlet">HelloServlet</a>

<a href="servlet/RouteServlet">路由跳转到test.jsp</a>

Servlet.java

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    doPost(request,response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    //request.getRequestDispatcher(request.getContextPath()+"/test.jsp").forward(request, response);
    
    /* 只要当服务器内部跳转(request)， 斜线指项目的根目录 */

    // request.getRequestDispatcher("/test.jsp").forward(request, response);

    
    /* 相对路径 */

    // request.getRequestDispatcher("../test.jsp").forward(request, response);

    // response.sendRedirect(request.getContextPath()+"/test.jsp");
}