【jsp求助帖】
【Reply.jsp】
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<%@ page import="java.sql.*"%>
<%
int id = Integer.parseInt(request.getParameter("id"));
int rootid = Integer.parseInt(request.getParameter("rootid"));
%>
<!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>
<element>
<form action="ReplyOk.jsp" method="post">
<table border="1">
<input type="hidden" name="id" value="<%=id%>">
<inptu type="hidden" name="rootid" value="<%=rootid%>">
<tr>
<td>
<input type="text" name="title" size="80">
</td>
</tr>
<tr>
<td>
<textarea cols="80" rows="12" name="cont"></textarea>
</td>
</tr>
<tr>
<td>
<input type="submit" value="提交">
</td>
</tr>
</table>
</form></element>
</body>
</html>
【ReplyOk.jsp】
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="ISO-8859-1"%>
<%@page import="java.sql.*" %>
<%
int id = Integer.parseInt(request.getParameter("id"));
int rootid = Integer.parseInt(request.getParameter("rootid"));
String title=request.getParameter("title");
String cont=request.getParameter("cont");
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
conn.setAutoCommit(false);
String sql="insert into article values(null,?,?,?,?,now(),0)";
PreparedStatement pstmt=conn.prepareStatement(sql);
Statement stmt=conn.createStatement();
pstmt.setInt(1,id);
pstmt.setInt(2,rootid);
pstmt.setString(3,title);
pstmt.setString(4,cont);
pstmt.executeUpdate();
stmt.executeUpdate("update article set isleaf=1 where id="+id);
conn.commit();
conn.setAutoCommit(true);
stmt.close();
pstmt.close();
conn.close();
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
ok
</body>
</html>
【错误提示】
org.apache.jasper.JasperException: An exception occurred processing JSP page /ReplyOk.jsp at line 7
4:
5: <%
6: int id = Integer.parseInt(request.getParameter("id"));
7: int rootid = Integer.parseInt(request.getParameter("rootid"));
8: String title=request.getParameter("title");
9: String cont=request.getParameter("cont");
10:
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:515)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:426)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
org.apache.jsp.ReplyOk_jsp._jspService(ReplyOk_jsp.java:59)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
JSP
[解决办法]
取到了空值，NULL作为参数输入Integer.parseInt就会出错。