ModelAndView 未将模型返回到 spring mvc 中的 JSP

ModelAndView not returning model to the JSP in spring mvc

我试图在通过控制器返回的 jsp 页面中显示该对象,但我在 jsp 中看不到该对象。下面是我的控制器:

@RequestMapping(value = "/search/{groupName}", menthod = {RequestMethod.Get, RequestMethod.POST})
public ModelAndView groupAlphaHandler(@PathVariable("groupName") String groupName, HttpServletRequest request) {

    ArryList<GroupAlphaInfoVO> groupAlphaInfoVO = groupAlphaService.loadGroupAlphaSearchResult(groupName);
    //view name "group-alpha"     
    ModelAndView mav = new ModelAndView("group-alpha");
    mav.addObject("groupAlphaInfoVO", groupAlphaInfoVO);
    mav.addObject("pageTitle", "Group Alpha");
    //added debug point here and made sure groupAlphaInfoVO is not null (it has around 1000 records)
    return mav;
    }

这是我的 jsp 页面 group-alpha.jsp:

<html>
<head>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Group Alpha</title>
</head>
<body>
        ${pageTitle}<!-- this is getting displayed on jsp-->
 ${groupAlphaInfoVO}
</body>
</html>

你需要这个isELIgnored="false"

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1" isELIgnored="false"%>  //here

看来你在控制器中犯了一个愚蠢的错误

@RequestMapping(value = "/search/{groupName}", menthod = {RequestMethod.Get, RequestMethod.POST})

有一个拼写错误。不是 **menthod****method** 而且我认为没有必要使用 RequestMethod.POST

另一个错误是 mav.addObject("groupAlphaInfoVO", groupAlphaInfoVO); 您在这段代码中放置了对象列表。而在 JSP 页面中你没有对列表进行任何操作。要打印该列表,您应该编写 <c:forEach>....</c:forEach> 代码。例如

<c:forEach var="results" items="${groupAlphaInfoVO}">
       <c:out value="${results.userid}"></c:out>
       <c:out value="${results.password}"></c:out>
       <c:out value="${results.role}"></c:out>
       <c:out value="${results.contact}"></c:out>
       <c:out value="${results.mentor}"></c:out>
       <c:out value="${results.group}"></c:out>
</c:forEach>

要使用,您需要在 pom.xml

中添加 JSTL 依赖项
<dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

并在 jsp 页面顶部添加 <%@ taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %>