EL表单式判断是否为null或者list为empty

http://newnull.com/jdbctemplate%E5%AE%9E%E7%8E%B0%E7%AE%80%E5%8D%95%E7%9A%84orm/

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@RequestMapping("/login")// 请求url地址映射，类似Struts的action-mappingpublic ModelAndView Login(@RequestParam(value = "userEmail", required = false) String userEmail,@RequestParam(value = "userNick", required = false) String userNick) {// @RequestParam是指请求url地址映射中必须含有的参数(除非属性required=false)// @RequestParam可简写为：@RequestParam("username")//// if (!"admin".equals(username) || !"admin".equals(password)) {// return "loginError"; //// 跳转页面路径（默认为转发），该路径不需要包含spring-servlet配置文件中配置的前缀和后缀// }// return "loginSuccess";String sql = "select * from user_info where user_email=? and password=?";UserInfo user = jdbcTemplate.queryForObject(sql,new Object[]{userEmail,userNick},new BeanPropertyRowMapper<UserInfo>(UserInfo.class));Map<String, UserInfo> model = new HashMap<String, UserInfo>();model.put("userlist", user);return new ModelAndView("index", model);}

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判断是否为空

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

<c:if test="${userInfo != null}"><tr><td><h2>${userInfo.id}</h2></td><td><h2>${userInfo.userNick}</h2></td><td><h2>${userInfo.userEmail}</h2></td></tr></c:if>

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或者使用如下

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<c:if test="${!empty userInfo}"><table><tr align="center"<c:if test="${i.index % 2 == 0}"> </c:if><c:if test="${i.index % 2 == 1}"> </c:if>><td><h2>${userInfo.id}</h2></td><td><h2>${userInfo.userNick}</h2></td><td><h2>${userInfo.userEmail}</h2></td></tr></table></c:if>

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