java.lang.NumberFormatException，仿BBS小程序出错，进来帮忙看看。解决思路
日期：2014-05-18 浏览次数：20781 次
java.lang.NumberFormatException，仿BBS小程序出错，进来帮忙看看。。
文件一：
ShowAtricltTree.jsp
文件二：
ShowArticleDetail.jsp
文件一：
ShowAtricltTree.jsp
- Java code
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<%@ page import="java.sql.*"%>
<%!
String str = "";
private void tree(Connection conn, int id, int level) {
Statement stmt = null;
ResultSet rs = null;
String preStr = "";
for (int i = 0; i < level; i++) {
preStr += "----";
}
try {
stmt = conn.createStatement();
String sql = "select * from article where pid = " + id;
rs = stmt.executeQuery(sql);
while (rs.next()) {
str += "<tr><td>" + rs.getInt("id") + "</td><td>" +
preStr+ "<a href='ShowArticleDetail.jsp?ID="+
rs.getInt("id") + "'>" + rs.getString("title") + "</a>" +
"</td></tr>";
if (rs.getInt("isleaf") != 0) {
tree(conn, rs.getInt("id"), level + 1);
}
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (rs != null) {
rs.close();
rs = null;
}
if (stmt != null) {
stmt.close();
stmt = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}%>
<%
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
Statement stmt = conn.createStatement();
ResultSet rs = stmt
.executeQuery("select * from article where pid =0");
while (rs.next()) {
str += "<tr><td>" + rs.getInt("id") + "</td><td>" +
"<a href='ShowArticleDetail.jsp?ID="+rs.getInt("id") + "'>" +
rs.getString("title") + "</a>" + "</td></tr>";
if (rs.getInt("isleaf") != 0) {
tree(conn, rs.getInt("id"), 1);
}
}
rs.close();
stmt.close();
conn.close();
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<title>Insert title here</title>
</head>
<body>
<table border ="1">
<%= str %>
</table>
</body>
</html>
文件二：
ShowArticleDetail.jsp
- Java code
<%@ page language="java" contentType="text/html; charset=GBK"
pageEncoding="GBK"%>
<%@ page import="java.sql.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
String strId = request.getParameter("id");
int id = Integer.parseInt(strId);
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