Question

我在SpringBoot中使用JSTL循环并获取Beans中的所有项目。但是当我得到结果时，我收到了一个错误：

javax.servlet.jsp.JspTagException: Don't know how to iterate over supplied "items" in &lt;forEach&gt;

型号：

@Entity
public class Manufacturer {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String name;
private String content;
// Get and Set
}

存储库类：

public interface ManufacturerRepository extends CrudRepository<Manufacturer, Integer> { 
}

服务类：

public interface ManufacturerService {
  Iterable<Manufacturer> listAllManufacturers();
}

服务Impl类：

@Service
public class ManufacturerServiceImpl implements ManufacturerService {

 private ManufacturerRepository manufacturerRepository;

 @Autowired
 public void setManufacturerRepository(ManufacturerRepository manufacturerRepository) {
       this.manufacturerRepository = manufacturerRepository;
 }

 @Override
 public Iterable<Manufacturer> listAllManufacturers() {
      return manufacturerRepository.findAll();
 }
 }

控制器类：

@Controller
@Component
@Scope("prototype")
public class ManagementManufacturerController {
 private ManufacturerService manufacturerService;

@Autowired
public void setManufacturerService(ManufacturerService manufacturerService) {
    this.manufacturerService = manufacturerService;
}
@RequestMapping(value = "/manufacturer", method = RequestMethod.GET)
public String list(Model model, HttpServletRequest request, HttpServletResponse response) {
    model.addAttribute("manufacturers", manufacturerService.listAllManufacturers());

    return "manageManufacturer";
}
}

JSP：

<c:forEach var="renter" items="${manufacturers}" varStatus="status">
    <c:out value="${renter.id}" />
    <c:out value="${renter.name}" />
    <c:out value="${renter.content}" />
</c:forEach>

记录消息：

  Stacktrace:] with root cause

  javax.servlet.jsp.JspTagException: Don't know how to iterate over supplied "items" in &lt;forEach&gt;
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.toForEachIterator(ForEachSupport.java:274)
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.supportedTypeForEachIterator(ForEachSupport.java:238)
at org.apache.taglibs.standard.tag.common.core.ForEachSupport.prepare(ForEachSupport.java:155)
at javax.servlet.jsp.jstl.core.LoopTagSupport.doStartTag(LoopTagSupport.java:256)
at org.apache.jsp.WEB_002dINF.views.manageManufacturer_jsp._jspx_meth_c_005fforEach_005f0(manageManufacturer_jsp.java:107)
at org.apache.jsp.WEB_002dINF.views.manageManufacturer_jsp._jspService(manageManufacturer_jsp.java:74)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)

我尝试过更改属性名称： items =“$ {manufacturers}”但是同样的错误，如何解决问题？谢谢

JSTL：不知道如何迭代＆lt; forEach＆gt;中提供的“items”

0 个答案: