从servlet重定向回具有上一个表单值的上一个jsp页面

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // 获取表单的值
    String username = request.getParameter("username");
    String password = request.getParameter("password");

    // 将表单值添加到重定向URL中
    String redirectURL = "previous.jsp?username=" + URLEncoder.encode(username, "UTF-8") + "&password=" + URLEncoder.encode(password, "UTF-8");

    // 重定向到上一个jsp页面
    response.sendRedirect(redirectURL);
}

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<form action="servlet" method="post">
    <input type="text" name="username" value="${param.username}" />
    <input type="password" name="password" value="${param.password}" />
    <input type="submit" value="Submit" />
</form>