質問編集履歴
2
test
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test
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サーブレット、Jsp、データクラスを使いcsvファイルを読み込み表示させたいのですが、
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java.lang.NullPointerExceptionが出てしまいますどうしたらいいですか？
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Servlet
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public void doPost(HttpServletRequest request,HttpServletResponse response)
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throws IOException, ServletException {
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request.setCharacterEncoding("Windows-31J");
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HttpSession session = request.getSession(false);
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String path = null;
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if (session == null) {
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session = request.getSession(true);
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path = "../view/Data.jsp";
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SuperClass sc = new SuperClass();
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//このメソッドでファイルを読み込みます
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List<String[]> readFile = sc.readFile();
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//このメソッドでデータクラスに格納しデータクラスを格納したリストを返します
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List<DataClass> List = sc.storeData(readFile);
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request.setAttribute("List", list);
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}
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RequestDispatcher rd = request.getRequestDispatcher(path);
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rd.forward(request, response);
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Jsp
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<%@ page language="java" contentType="text/html; charset=Windows-31J"
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pageEncoding="Windows-31J" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<%@ page import="java.util.List" %>
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<%@ page import="model.DataClass" %>
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<%List<DataClass> List = (List<DataClass>) request.getAttribute("List");%>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=windows-31j">
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<title>一覧</title>
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</head>
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<body>
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<table border="1" width="150px" >
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<tr height="80px">
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<th bgcolor="#ffff00">
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<font color="#00ff00">入力値</font>
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</th>
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</tr>
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<%
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for (int i = 0; i < ｌist.size(); i++) {
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DataClass input = ｌist.get(i);
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//データクラスから番号を取得
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String number = input.getSyainNumber();
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//データクラスから氏名を取得
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String name = input.getSyainName();
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%>
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<tr height="40px">
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<td align="right">
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<%=number %>
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<%=name %>
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</td>
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</tr>
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<% } %>
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</table>
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例外ログ
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org.apache.jasper.JasperException: java.lang.NullPointerException
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org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
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1
test
CHANGED
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File without changes
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test
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@@ -137,3 +137,21 @@
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<% } %>
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</table>
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例外ログ
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org.apache.jasper.JasperException: java.lang.NullPointerException
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org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
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org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
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org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
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org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
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javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
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