一尘不染

在JSP中使用request.getParameter会导致NullPointerException

jsp

尝试获取查询字符串参数并在JSP页面中采取适当的措施。

这是一个片段:

<%@ page import="com.companyx.portal.model.LDAPAttributes" %>
<%@ page import="com.companyx.portal.service.LDAPAttributesLocalServiceUtil" %>
<%@ page import="com.liferay.portal.model.User" %>
<%@ page import="com.liferay.portal.util.PortalUtil" %>
<%@ page import="javax.servlet.http.HttpServletRequest" %>

<%
User user = PortalUtil.getUser(request);
String screenName = user.getScreenName();
LDAPAttributes attr = LDAPAttributesLocalServiceUtil.getLDAPAttributes(screenName);
String store = attr.getLegacyStoreNo();
String org = request.getParameter("org");
%>

...more code here...

<html>
...html code here...
<form name="LoginForm" action="check_login.php">
    <input type="hidden" name="LOGIN_NAME" size="20" value="<%= store %>" />
    <input type="hidden" name="LOGIN_PASSWORD" size="20" value="<%= store %>" />
    <input type="hidden" name="ORGANIZATION" value="<%= org %>" />
</form>

当以下行不存在时:

 String org = request.getParameter("org");
 ...
 <input type="hidden" name="ORGANIZATION" value="<%= org %>" />

该脚本可以正常工作,但是我需要从查询字符串中捕获一个’org’参数,将其写入生成的表单中并提交。但是,当这些行存在时,我会收到500错误。

有什么想法吗?


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2020-06-10

共1个答案

一尘不染

您可能正在使用PortletRequest而不是HttpServletRequest

HttpServletRequest realRequest = PortalUtil.getHttpServletRequest(request);

String organization = realRequest.getParameter("org");
2020-06-10