问JSTL无法打印对象列表
EN

Stack Overflow用户

提问于 2015-12-08 05:32:06

回答 1查看 1.2K关注 0票数 0

我试图使用JSTL在Jsp页面中打印一个列表对象，但我得到了一些例外。下面是我的应用程序的模型类

public class ItemMaster implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = -1364853156929567630L;

private BigDecimal itemId;
private String itemNumber;
private String description;
private String lifeCyclePhase;
public BigDecimal getItemId() {
    return itemId;
}
public void setItemId(BigDecimal itemId) {
    this.itemId = itemId;
}
public String getItemNumber() {
    return itemNumber;
}
public void setItemNumber(String itemNumber) {
    this.itemNumber = itemNumber;
}
public String getDescription() {
    return description;
}
public void setDescription(String description) {
    this.description = description;
}
public String getLifeCyclePhase() {
    return lifeCyclePhase;
}
public void setLifeCyclePhase(String lifeCyclePhase) {
    this.lifeCyclePhase = lifeCyclePhase;
}

下面是该列表的控制器

@RequestMapping(value="/searchQuery", method=RequestMethod.POST)
    public ModelAndView submitForm(HttpServletRequest request, ModelAndView model) {
    String[] listBox1 = request.getParameterValues("selectedright");
    List<ItemMaster> lists=itemDao.fetchRecords(listBox1);
    model.addObject("queryResult",lists);
    model.setViewName("results");    
    return model;
    }

下面是我的jsp页面的片段，在这里我试图检索值。

<c:forEach var="queryResult" items="${queryResult}" varStatus="status">
            <tr>
       <td>${status.index + 1}</td>
                <td>${queryResult.itemId}</td>
                <td>${queryResult.itemNumber}</td>
                <td>${queryResult.description}</td>
                <td>${queryResult.lifeCyclePhase}</td> 
            </tr>
            </c:forEach>

我所犯的错误是

java.lang.NumberFormatException: For input string: "itemId"
java.lang.NumberFormatException.forInputString(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
javax.el.ListELResolver.coerce(ListELResolver.java:157)
javax.el.ListELResolver.getValue(ListELResolver.java:70)
org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:110)
org.apache.el.parser.AstValue.getValue(AstValue.java:167)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:936)
org.apache.jsp.WEB_002dINF.views.results_jsp._jspService(results_jsp.java:145)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:431)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

model-view-controller

jstl

java

spring

jsp

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回答 1

Stack Overflow用户

回答已采纳

发布于 2015-12-08 06:46:07

因为您需要获得BigDecimal值，所以您必须使用JSTL格式taglib来格式化BigDecimal的显示。

以及JSP上的taglib下面。

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

现在找出名单，

<c:forEach var="queryResult" items="${queryResult}" varStatus="status">
    <tr>
       <td>${status.index + 1}</td>
       <td><fmt:formatNumber value="${queryResult.itemId}" minFractionDigits="2"/></td>
       <td>${queryResult.itemNumber}</td>
       <td>${queryResult.description}</td>
       <td>${queryResult.lifeCyclePhase}</td> 
    </tr>
</c:forEach>