java.lang.NullPointerException错误
日期：2014-05-18 浏览次数：20675 次
java.lang.NullPointerException异常
<%@ page language= "java " pageEncoding= "GBK " %>
<%@ include file= "../../common.jsp " %>
<LINK href=../../css/css.css rel=stylesheet>
<style type= "text/css ">
<!--
.STYLE1 {font-family: Verdana, Arial, Helvetica, sans-serif}
-->
</style>
<link href= "../css/css.css " rel= "stylesheet " type= "text/css ">
<body bgcolor= "#F4F2F2 " topmargin= "4 ">
<br/>
<% Database dsm=new Database();
ResultSet rs=null;
int N_id=0;
String USER_name= " ";
String sqlStr= " ";
String N_sign= " ";
String N_addDate= " ";
String N_addUser= " ";
String N_title= " ";
String N_content= " ";
String N_sort= " ";
String S_id= " ";
String P_id= " ";
%>
<%
N_id=3;
System.out.println(N_id);
USER_name=(String)session.getAttribute( "USER_name ");
sqlStr= "select * from newsshow where N_id=3 ";
//System.out.println(sqlStr);
try{
dsm.setSqlStr(sqlStr);
dsm.executeQuery();
rs=dsm.getRs();
while(rs.next()){
N_title=rs.getString( "N_title ");
N_content=rs.getString( "N_content ");
N_addDate=(rs.getString( "N_addDate ")).substring(0,19);
N_addUser=rs.getString( "N_addUser ");
N_sort=rs.getString( "S_name ");
N_sign=rs.getString( "P_name ");
%>
<form method= "POST " name= "myform " action= "../../servlet/SortAdd ">
<table width= "700 " height= "127 " border= "0 " align= "center "
cellpadding= "0 " cellspacing= "1 " bgcolor= "#BBB3AA ">
<tr bgcolor= "FBF5F0 ">
<td height= "30 " colspan= "4 " align= "center "> <font color= "#CC0000 "> <b> 新闻类别信息修改
</b> </font> </td>
</tr>
<tr bgcolor= "#FFFFFF ">
<
<%@ page language= "java " pageEncoding= "GBK " %>
<%@ include file= "../../common.jsp " %>
<LINK href=../../css/css.css rel=stylesheet>
<style type= "text/css ">
<!--
.STYLE1 {font-family: Verdana, Arial, Helvetica, sans-serif}
-->
</style>
<link href= "../css/css.css " rel= "stylesheet " type= "text/css ">
<body bgcolor= "#F4F2F2 " topmargin= "4 ">
<br/>
<% Database dsm=new Database();
ResultSet rs=null;
int N_id=0;
String USER_name= " ";
String sqlStr= " ";
String N_sign= " ";
String N_addDate= " ";
String N_addUser= " ";
String N_title= " ";
String N_content= " ";
String N_sort= " ";
String S_id= " ";
String P_id= " ";
%>
<%
N_id=3;
System.out.println(N_id);
USER_name=(String)session.getAttribute( "USER_name ");
sqlStr= "select * from newsshow where N_id=3 ";
//System.out.println(sqlStr);
try{
dsm.setSqlStr(sqlStr);
dsm.executeQuery();
rs=dsm.getRs();
while(rs.next()){
N_title=rs.getString( "N_title ");
N_content=rs.getString( "N_content ");
N_addDate=(rs.getString( "N_addDate ")).substring(0,19);
N_addUser=rs.getString( "N_addUser ");
N_sort=rs.getString( "S_name ");
N_sign=rs.getString( "P_name ");
%>
<form method= "POST " name= "myform " action= "../../servlet/SortAdd ">
<table width= "700 " height= "127 " border= "0 " align= "center "
cellpadding= "0 " cellspacing= "1 " bgcolor= "#BBB3AA ">
<tr bgcolor= "FBF5F0 ">
<td height= "30 " colspan= "4 " align= "center "> <font color= "#CC0000 "> <b> 新闻类别信息修改
</b> </font> </td>
</tr>
<tr bgcolor= "#FFFFFF ">
<
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