我正在学习 Spring MVC，并且我在理解如何在 jsp 中使用我的类时遇到问题，这是我的 Controller :
@Controller
public class BusinessController {
@Autowired
private BusinessService businessService;
@RequestMapping("/index")
public String listContacts(Map<String, Object> map) {
map.put("business", new Business());
map.put("businessList", businessService.listBusiness());
return "business";
}
@RequestMapping("/find/{businessDate}")
public String listContactsByDate(@PathVariable("businessDate") Map<String, Object> map, String businessDate) {
map.put("businessByDate", new Business());
map.put("businessByDateList", businessService.listBusinessByDate(businessDate));
return "businessByDate";
}
@RequestMapping("/")
public String home() {
return "redirect:/index";
}
@RequestMapping(value = "/add", method = RequestMethod.POST)
public String addBusiness(@ModelAttribute("business") Business business, BindingResult result) {
businessService.addBusiness(business);
return "redirect:/index";
}
@RequestMapping("/delete/{businessId}")
public String deleteBusiness(@PathVariable("businessId") Integer businessId) {
businessService.removeBusiness(businessId);
return "redirect:/index";
}
}
这是我的jsp:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf8">
<title><spring:message code="label.title" /></title>
</head>
<body>
<h2>
<spring:message code="label.title" />
</h2>
<form:form method="post" action="add" commandName="business">
<table>
<tr>
<td><form:label path="businessDate">
<spring:message code="label.date" />
</form:label></td>
<td><form:input path="businessDate" /></td>
</tr>
<tr>
<td><form:label path="description">
<spring:message code="label.description" />
</form:label></td>
<td><form:input path="description" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit"
value="<spring:message code="label.addbusiness"/>" /></td>
</tr>
</table>
</form:form>
<form:form method="post" action="/find/{$businessDate}"
commandName="businessByDate">
<table>
<tr>
<td><form:label path="businessDate">
<spring:message code="label.date" />
</form:label></td>
<td><form:input path="businessDate" /></td>
</tr>
</table>
<c:if test="${!empty businessByDateList}">
<table class="data">
<tr>
<th><spring:message code="label.date" /></th>
<th><spring:message code="label.description" /></th>
<th> </th>
</tr>
<c:forEach items="${businessByDate}" var="business">
<tr>
<td>${businessByDate.businessDate}</td>
<td>${businessByDate.description}</td>
<td><a href="delete/${businessByDate.id}"><spring:message
code="label.delete" /></a></td>
</tr>
</c:forEach>
</table>
</c:if>
</form:form>
<h3>
<spring:message code="label.businesses" />
</h3>
<c:if test="${!empty businessList}">
<table class="data">
<tr>
<th><spring:message code="label.date" /></th>
<th><spring:message code="label.description" /></th>
<th> </th>
</tr>
<c:forEach items="${businessList}" var="business">
<tr>
<td>${business.businessDate}</td>
<td>${business.description}</td>
<td><a href="delete/${business.id}"><spring:message
code="label.delete" /></a></td>
</tr>
</c:forEach>
</table>
</c:if>
</body>
</html>
而且，这是我的服务实现类:
@Repository
public class BusinessDAOImpl implements BusinessDAO{
@Autowired
private SessionFactory sessionFactory;
public void addBusiness(Business business){
sessionFactory.getCurrentSession().save(business);
}
@SuppressWarnings("unchecked")
public List<Business> listBusinessByDate(String businessDate){
String hql = "from Business B where B.date = :business_date";
Query query = sessionFactory.getCurrentSession().createQuery(hql);
query.setParameter("business_date", businessDate);
return query.list();
}
@SuppressWarnings("unchecked")
public List<Business> listBusiness(){
return sessionFactory.getCurrentSession().createQuery("from Business").list();
}
public void removeBusiness(Integer id){
Business business = (Business) sessionFactory.getCurrentSession().load(
Business.class, id);
if (null != business) {
sessionFactory.getCurrentSession().delete(business);
}
}
}
如果没有jsp的部分，我尝试列出企业的日期，一切正常，我可以添加一个企业，它将立即列在下表中，但如果我添加带有businessByDate的部分，我会得到
Neither BindingResult nor plain target object for bean name 'businessByDate' available as request attribute
我该如何解决这个问题？谢谢
enter code here
最佳答案
这是来自此表单标签:
<form:form method="post" action="/find/{$businessDate}"
commandName="businessByDate">
看起来你只做:
map.put("businessByDate", new Business());
在该表单的操作方法中。您需要在实际加载页面的方法中将该对象添加到 map 中!
关于java - Spring MVC项目用hibernate无法理解如何在jsp中使用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14883531/