常連

servletで受け取った値で処理を分岐させようとしていますが、
入力チェックの処理を書いたところExceptionが発生します。

未入力で登録もしくは変更を押した場合に、
処理を最初からにしたいのですが、if (error || error2) の error にfalseがセットされていると思うのですが、elseに処理が移らない状況です。

恐れ入りますが、ご教授いただけないでしょうか。
よろしくお願いします。

例外：
javax.servlet.ServletException: java.lang.NumberFormatException: For input string: ""
	websample.StartServlet.doPost(StartServlet.java:106)

``` java servlet
package websample;

import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class StartServlet extends HttpServlet {
	AccountDAO dao = new AccountDAO();
	List<Account> list = new ArrayList<Account>();

	@Override
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/plain; charset=UTF-8");
		try {
			dao = new AccountDAO();
			list = dao.findAll();
			request.setAttribute("list", list);
			request.getRequestDispatcher("/websample/select.jsp").forward(request, response);
		} catch (Exception e) {
			throw new ServletException(e);
		}
	}

	@Override
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		String Search = request.getParameter("検索");
		String Registration = request.getParameter("登録");
		String update = request.getParameter("変更");
		String delete = request.getParameter("削除");

		String id = null;
		String name = null;
		String money1 = null;
		String money2 = null;
		String keyword = request.getParameter("keyword");
		String message = null;
		boolean error = false;
		boolean error2 = false;
		String errorMessage = null;

		HttpSession session = request.getSession(true);

		id = (String) session.getAttribute("ID");
		name = request.getParameter("keyword1");
		money1 = request.getParameter("keyword2");
		money2 = request.getParameter("keyword3");

		System.out.println("54 ID=" + id);
		System.out.println("55 name=" + name);
		System.out.println("56 money1=" + money1);
		System.out.println("57 money2=" + money2);

		System.out.println("59 Search=" + Search);
		System.out.println("60 Registration=" + Registration);
		System.out.println("61 update=" + update);
		System.out.println("62 delete=" + delete);

		response.setContentType("text/plain; charset=UTF-8");

		if (id == null || id.length() == 0 || name == null || name.length() == 0 || money1 == null
				|| money1.length() == 0 || money2 == null || money2.length() == 0) {
			error = false;
		}

		if (Search == null && Registration == null && update == null && delete == null) {
			try {
				list = dao.findAll();
				request.setAttribute("list", list);
				request.getRequestDispatcher("/websample/select.jsp").forward(request, response);
			} catch (SQLException e) {
				throw new ServletException(e);
			}
		} else if (Search != null || Registration != null || update != null || delete != null) {
			error2 = true;
		}

		System.out.println("80 error1=" + error);
		System.out.println("81 error2=" + error2);

		if (error || error2) {
			if (Search != null && Search.equals("検索")) {
				try {
					list = dao.whereSelect(keyword);
					message = list.size() + "件ヒット!";
					request.setAttribute("list", list);
					request.setAttribute("message", message);
					request.getRequestDispatcher("/websample/select.jsp").forward(request, response);
				} catch (Exception e) {
					throw new ServletException(e);
				}
			} else if (Registration != null && Registration.equals("登録")) {
				try {
					int cnt = dao.findNew(name, money1, money2);
					message = cnt + "件登録しました";
					request.setAttribute("message", message);
					request.getRequestDispatcher("/websample/select.jsp").forward(request, response);
				} catch (Exception e) {
					throw new ServletException(e);
				}
			} else if (update != null && update.equals("変更")) {
				try {
					int cnt = dao.findUpDate(name, money1, money2, id);
					message = cnt + "件変更しました";
					request.setAttribute("message", message);
					request.getRequestDispatcher("/websample/select.jsp").forward(request, response);
				} catch (Exception e) {
					throw new ServletException(e);
				}
			}
		} else if (delete != null && delete.equals("削除")) {
			try {
				int cnt = dao.findDelete(id);
				message = cnt + "件削除しました";
				request.setAttribute("message", message);
				request.getRequestDispatcher("/websample/select.jsp").forward(request, response);
			} catch (Exception e) {
				throw new ServletException(e);
			}

		} else {
			try {
				errorMessage = "入力漏れがあるよ";
				System.out.println("124 servlet error=" + errorMessage);
				request.setAttribute("error", errorMessage);
				request.getRequestDispatcher("/websample/select.jsp").forward(request, response);
			} catch (Exception e) {
				throw new ServletException(e);
			}
		}
	}
}
```

```jsp
<%@page contentType="text/html; charset=UTF8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>accountDB</title>
<link rel="stylesheet" href="select.css">
</head>
	<body>
		<c:if test="${message != null}">
			<p>処理結果：${message}</p>
		</c:if>
		<c:if test="${error != null}">
			<p>${error}</p>
		</c:if>
		<form name="f" method="POST" action="../DBweb/account">
			<input type="text" name="keyword" value="${keyword}">
			<input type="submit" name="検索" value="検索">
			<input type="button" name="新規" value="新規" onClick="document.location='websample/select_input.jsp?新規=新規';">

		<c:if test="${!empty list}">
			<table border="1">
				<tr>
					<th>ID</th>
					<th>NAME</th>
					<th>MONEY</th>
					<th>MONEY2</th>
				</tr>
			<c:forEach var="account" items="${list}">
				<tr>
					<td><a href="websample/select_input.jsp?変更=変更&ID=${account.id}">${account.id}</a></td>
					<td>${account.name }</td>
					<td>${account.money }</td>
					<td>${account.money2 }</td>
				</tr>
			</c:forEach>
			</table>
		</c:if>
		</form>
	</body>
</html>
```

```jsp
<%@page contentType="text/html; charset=UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
	<title>入力画面</title>
	<link rel="stylesheet" href="select.css">
</head>
<body>
	<% String chenge = request.getParameter("変更"); %>
	<% String x = request.getParameter("新規"); %>
	<% String id = request.getParameter("ID"); %>
	<% String error = (String) request.getAttribute("error"); %>
	<% System.out.println("chenge=" + chenge); %>
	<% System.out.println("x=" + x); %>
	<% System.out.println("error=" + error); %>
	<% session.setAttribute("ID", id); %>

	<% if (error != null || x == null && chenge.equals("変更")){ %>
		<p>変更</p>
		<form method="POST" action="../account">
			<div>
				<label for="name">ID</label>
				${ID}
			</div>
			<div>
				<label for="name">NAME</label>
				<input type="text" name="keyword1"><br>
			</div>
			<div>
				<label for="money">MONEY1</label>
				<input type="text" name="keyword2"><br>
			</div>
			<div>
				<label for="money">MONEY2</label>
				<input type="text" name="keyword3"><br>
			</div>
			<input type="submit" name="変更" value="変更" onClick="return confirm('変更しますか？')">
			<input type="submit" name="削除" value="削除" onClick="return confirm('削除しますか？')">
			<input type="submit" name="戻る" value="戻る" >
		</form>
	<% } else if (chenge == null && x.equals("新規")){ %>
		<p>登録</p>
		<form method="POST" action="../account">
			<div>
				<label for="name">NAME</label>
				<input type="text" name="keyword1"><br>
			</div>
			<div>
				<label for="money">MONEY1</label>
				<input type="text" name="keyword2"><br>
			</div>
			<div>
				<label for="money">MONEY2</label>
				<input type="text" name="keyword3"><br>
			</div>
			<input type="submit" name="登録" value="登録" onClick="return confirm('登録しますか？')">
			<input type="submit" name="戻る" value="戻る" >
		</form>
	<% } %>
</body>
</html>
```

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