这错误怎么回事?莫名其妙嘛!!

Question

type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: An exception occurred processing JSP page /insertMessage.jsp at line 1916:  String sql = "insert into message values(null,1,'" + 
17:  title + "','" + content + "',now(),'" + author + "','" + email + "',0)";
18:  System.out.println(sql);
19:  int rt = stmt.executeUpdate(sql);
20: 
21:  out.println("鎴愬姛鎻掑叆" + rt + "鏉¤褰�!");
22: 

Answer 1

本帖最后由 java2000_net 于 2009-08-13 21:15:23 编辑

  

Answer 2

SQL语句没错啊...我把语句导出来,然后直接复制到MYSQL里面正确执行了..

Answer 3

这是后台打印出的SQL语句:
insert into message values(null,1,'asdfasd','null',now(),'swdasdf','asdf',0)
这是我那表的结构:
+---------+-------------+------+-----+---------+----------------+
| Field   | Type        | Null | Key | Default | Extra          |
+---------+-------------+------+-----+---------+----------------+
| id      | int(11)     | NO   | PRI | NULL    | auto_increment |
| pid     | int(11)     | NO   |     | NULL    |                |
| title   | varchar(50) | NO   |     | NULL    |                |
| content | text        | NO   |     | NULL    |                |
| data    | datetime    | YES  |     | NULL    |                |
| author  | varchar(10) | NO   |     | NULL    |                |
| email   | varchar(20) | YES  |     | NULL    |                |
| isleaf  | int(11)     | YES  |     | NULL    |                |
+---------+-------------+------+-----+---------+----------------+
8 rows in set (0.09 sec)

Answer 4

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@ page import="java.sql.*" %>
<%
Connection conn = null;
Statement stmt = null;
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost/MessageBoard?user=root&password=clslist");

request.setCharacterEncoding("utf-8");
String author = request.getParameter("author");
String email = request.getParameter("email");
String title = request.getParameter("title");
String content = request.getParameter("content");

String sql = "insert into message values(null,1,'" + 
title + "','" + content + "',now(),'" + author + "','" + email + "',0)";
System.out.println(sql);
int rt = stmt.executeUpdate(sql);

out.println("成功插入" + rt + "条记录!");

stmt.close();
conn.close(); 

%>

Answer 5

仔细检查过了，没有不对，而且把组之后的SQL语句直接复制到mysql后台去执行，没有问题。所以，问题没有出在sql语句上。

Answer 6

源码我都贴出来了，大家帮帮忙啊！~
insert into message values(null,1,'qwerqwerqwe','aaaaaaaaaaaaaaaaaaaaaaaaaaa',now(),'erfwefw','frqwefqwerqwer',0)
2009-8-13 21:28:55 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at org.apache.jsp.insertMessage_jsp._jspService(insertMessage_jsp.java:71)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

Answer 7

还是我自己找出了答案，我少写了一句！！
stmt = conn.creatStatement();哈哈。。大家都没说到点子上。。公平起见，这次就不给分了啊。。