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我請求URL http://localhost:8080/myApp/reg/show?pageNumber=1&pageRange=-1 和show.jsp我有JSTL解析負數java.lang.NumberFormatException：對於輸入字符串： 「」
<ts:pagination allData="${tecBacking.tec}"
pageRange="${param.pageRange}"
pageNumber="${param.pageNumber}"
url="show">
<jsp:attribute name="tableHeaders">
<th>Идентификатор</th>
<th>Код</th>
<th>Описание</th>
<th>Тип</th>
<th>Създадено от</th>
</jsp:attribute>
</ts:pagination>
而且我分頁標籤
<%@tag description="This is for common pagination" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<%-- The list of normal or fragment attributes can be specified here: --%>
<%@attribute name="tableHeaders" fragment="true" required="true"%>
<%@attribute name="allData" required="false" type="java.util.Collection"%>
<%@attribute name="pageNumber" required="false" type="java.lang.Long"%>
<%@attribute name="pageRange" required="false" type="java.lang.Long"%>
<%@attribute name="url" required="false"%>
<c:set target="${paginationModel}" property="objects" value="${(empty allData) ? paginationModel.objects : allData}" />
<c:set target="${paginationModel}" property="pageNumber" value="${(empty pageNumber) ? 1 : pageNumber}" />
<c:set target="${paginationModel}" property="pageRange" value="${(empty pageRange) ? 10 : pageRange}" />
<c:set target="${paginationModel}" property="url" value="${(empty url) ? paginationModel.url : url}"/>
分頁模型是
@Named
@SessionScoped
public class PaginationModel implements Serializable {
private List<List<String>> objects;
private Long pageNumber;
private Long pageRange;
private String url;
public PaginationModel() {
objects = new ArrayList<>();
pageNumber = 1L;
pageRange = 10L;
url = "";
}
//getters and setters
}
但在回答我收到這個異常
javax.servlet.ServletException：javax.servlet.jsp.JspException：java.lang.NumberFormatException：對於輸入字符串： 「」
問題是從pageRange requestParam解析-1。我儘量讓改變分頁標籤，如：
<c:set target="${paginationModel}" property="pageRange" value="${10}" />
，一切正常，但是當我嘗試
<c:set target="${paginationModel}" property="pageRange" value="${pageRange}" />
我收到同樣的異常。我嘗試調用$ {} pageRange在分頁標籤（和解析$ {10}到paginationModel.pageRange）和輸出是
-1 我能不明白的地方是我的錯誤（paginationModel.pageRange有類型java.lang.Long和屬性pageRange已設置type =「java.lang.Long」）以及如何修復異常。