HTTP Status 500 - --------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
java.lang.NullPointerException
numb1.com.onLine.delUser(onLine.java:17)
numb1.com.onLine.addUser(onLine.java:53)
org.apache.jsp.first_jsp._jspService(first_jsp.java:211)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.
--------------------------------------------------------------------------------
Apache Tomcat/6.0.18db.java代码
package numb1.com;import java.lang.*;
import java.sql.*;
public class db{ private Connection con;
private Statement st;
private ResultSet rs;
private String host="localhost";
private String user="root";
private String pw="123456";
private String db="numb1";
private String Dri="com.mysql.jdbc.Driver";
private String url="jdbc:mysql://"+host+"/"+db;
public String getStr(String s){
String str=s;
try{
byte b[]=str.getBytes("ISO-8859-1");
str=new String(b);
return str;
}
catch(Exception e){return null;}
}
public String gb2iso(String qs){
try{
if (qs == null) return "NULL";
else return new String(qs.getBytes("gb2312"),"iso-8859-1");
}
catch(Exception e){
System.out.print("gb2iso error:"+e.getMessage());
}
return "NULL";
} public void close(){//关闭连接
try{
if(rs!=null)rs.close();
}catch(Exception e){
System.out.print("rs"+e.getMessage());
}
try{
if(st!=null)st.close();
}catch(Exception e){
System.out.print("st"+e.getMessage());
} try{
if(con!=null)con.close();
}catch(Exception e){
System.out.print("con"+e.getMessage());
}
}
public ResultSet query(String sql)throws Exception{
try{
Class.forName(Dri).newInstance();
con=DriverManager.getConnection(url,user,pw);
st=con.createStatement();
rs=st.executeQuery(sql);
return rs;
}catch(SQLException e){
System.out.print(e.getMessage());
return null;
}
}
public void update(String sql)throws Exception{
try{
Class.forName(Dri).newInstance();
con=DriverManager.getConnection(url,user,pw);
st=con.createStatement();
st.executeUpdate(sql);
st.close();
con.close();
}catch(SQLException e){
System.out.print(e.getMessage());
}
}}online.java代码package numb1.com;
import java.util.ArrayList;
import java.util.Date;public class onLine{ ArrayList<String> User=new ArrayList<String>(); public void delUser(long onTime){
Date nowTime=new Date();
Long l;
for(int i=0;i<User.size();i+=5){
try{
l=Long.getLong(User.get(i+4));
if(nowTime.getTime()/1000-l.intValue()>=onTime){
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
}
}catch(ArrayIndexOutOfBoundsException e){}
catch(ClassCastException e){}
}
User.trimToSize();
} public void addUser(String uId,String uName,String uPage,String uIP,long onTime){
Date nowTime=new Date();
Long l=new Long(nowTime.getTime()/1000);
for(int i=0;i<User.size();i+=5){
try{
if(uId.compareTo((String)User.get(i))==0 && uIP.compareTo((String)User.get(i+3))==0){
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
break;
}
}catch(ArrayIndexOutOfBoundsException e){}
catch(ClassCastException e){}
}
User.add(uId);
User.add(uName);
User.add(uPage);
User.add(uIP);
User.add(l.toString());
delUser(onTime); } public boolean Login(String uId,String uIP){
for(int i=0;i<User.size();i+=5){
try{
if(uId.compareTo((String)User.get(i))==0) return false;
if(((String)User.get(i)).compareTo("guest")==0 && uIP.compareTo((String)User.get(i+3))==0){
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
break;
}
}catch(ArrayIndexOutOfBoundsException e){}
}
return true;
} public void Shut(String uId){
for(int i=0;i<User.size();i+=5){
try{
if(((String)User.get(i)).compareTo(uId)==0){
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
break;
}
}catch(ArrayIndexOutOfBoundsException e){}
}
}
public int gCount(){
return User.size()/5;
} public int gUCount(){
int n=0;
for(int i=0;i<User.size();i+=5){
try{
if(((String)User.get(i)).compareTo("guest")!=0){
n++;
}
}catch(ArrayIndexOutOfBoundsException e){}
}
return n;
} public int gThisCount(String boardid){
String[] str=getuPage();
int n=0;
for(int i=0;i<str.length;i++){
try{
if(str[i].substring(str[i].lastIndexOf("=")+1).compareTo(boardid)==0){
n++;
}
}catch(StringIndexOutOfBoundsException e){}
}
return n;
}
public String[] getuId(){
String[] str=new String[User.size()/5];
int n=0;
for(int i=0;i<User.size();i+=5){
try{
str[n++]=(String)User.get(i);
}catch(ArrayIndexOutOfBoundsException e){} }
return str;
} public String[] getuName(){
String[] str=new String[(User.size()/5)];
int n=0;
for(int i=1;i<User.size();i+=5){
try{
str[n++]=(String)User.get(i);
}catch(ArrayIndexOutOfBoundsException e){}
}
return str;
}
public String[] getuPage(){
String[] str=new String[(User.size()/5)];
int n=0;
for(int i=2;i<User.size();i+=5){
try{
str[n++]=(String)User.get(i);
}catch(ArrayIndexOutOfBoundsException e){}
}
return str;
} public String[] getuIP(){
String[] str=new String[(User.size()/5)];
int n=0;
for(int i=3;i<User.size();i+=5){
try{
str[n++]=(String)User.get(i);
}catch(ArrayIndexOutOfBoundsException e){}
}
return str;
}
}
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
java.lang.NullPointerException
numb1.com.onLine.delUser(onLine.java:17)
numb1.com.onLine.addUser(onLine.java:53)
org.apache.jsp.first_jsp._jspService(first_jsp.java:211)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.
--------------------------------------------------------------------------------
Apache Tomcat/6.0.18db.java代码
package numb1.com;import java.lang.*;
import java.sql.*;
public class db{ private Connection con;
private Statement st;
private ResultSet rs;
private String host="localhost";
private String user="root";
private String pw="123456";
private String db="numb1";
private String Dri="com.mysql.jdbc.Driver";
private String url="jdbc:mysql://"+host+"/"+db;
public String getStr(String s){
String str=s;
try{
byte b[]=str.getBytes("ISO-8859-1");
str=new String(b);
return str;
}
catch(Exception e){return null;}
}
public String gb2iso(String qs){
try{
if (qs == null) return "NULL";
else return new String(qs.getBytes("gb2312"),"iso-8859-1");
}
catch(Exception e){
System.out.print("gb2iso error:"+e.getMessage());
}
return "NULL";
} public void close(){//关闭连接
try{
if(rs!=null)rs.close();
}catch(Exception e){
System.out.print("rs"+e.getMessage());
}
try{
if(st!=null)st.close();
}catch(Exception e){
System.out.print("st"+e.getMessage());
} try{
if(con!=null)con.close();
}catch(Exception e){
System.out.print("con"+e.getMessage());
}
}
public ResultSet query(String sql)throws Exception{
try{
Class.forName(Dri).newInstance();
con=DriverManager.getConnection(url,user,pw);
st=con.createStatement();
rs=st.executeQuery(sql);
return rs;
}catch(SQLException e){
System.out.print(e.getMessage());
return null;
}
}
public void update(String sql)throws Exception{
try{
Class.forName(Dri).newInstance();
con=DriverManager.getConnection(url,user,pw);
st=con.createStatement();
st.executeUpdate(sql);
st.close();
con.close();
}catch(SQLException e){
System.out.print(e.getMessage());
}
}}online.java代码package numb1.com;
import java.util.ArrayList;
import java.util.Date;public class onLine{ ArrayList<String> User=new ArrayList<String>(); public void delUser(long onTime){
Date nowTime=new Date();
Long l;
for(int i=0;i<User.size();i+=5){
try{
l=Long.getLong(User.get(i+4));
if(nowTime.getTime()/1000-l.intValue()>=onTime){
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
}
}catch(ArrayIndexOutOfBoundsException e){}
catch(ClassCastException e){}
}
User.trimToSize();
} public void addUser(String uId,String uName,String uPage,String uIP,long onTime){
Date nowTime=new Date();
Long l=new Long(nowTime.getTime()/1000);
for(int i=0;i<User.size();i+=5){
try{
if(uId.compareTo((String)User.get(i))==0 && uIP.compareTo((String)User.get(i+3))==0){
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
break;
}
}catch(ArrayIndexOutOfBoundsException e){}
catch(ClassCastException e){}
}
User.add(uId);
User.add(uName);
User.add(uPage);
User.add(uIP);
User.add(l.toString());
delUser(onTime); } public boolean Login(String uId,String uIP){
for(int i=0;i<User.size();i+=5){
try{
if(uId.compareTo((String)User.get(i))==0) return false;
if(((String)User.get(i)).compareTo("guest")==0 && uIP.compareTo((String)User.get(i+3))==0){
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
break;
}
}catch(ArrayIndexOutOfBoundsException e){}
}
return true;
} public void Shut(String uId){
for(int i=0;i<User.size();i+=5){
try{
if(((String)User.get(i)).compareTo(uId)==0){
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
User.remove(i);
break;
}
}catch(ArrayIndexOutOfBoundsException e){}
}
}
public int gCount(){
return User.size()/5;
} public int gUCount(){
int n=0;
for(int i=0;i<User.size();i+=5){
try{
if(((String)User.get(i)).compareTo("guest")!=0){
n++;
}
}catch(ArrayIndexOutOfBoundsException e){}
}
return n;
} public int gThisCount(String boardid){
String[] str=getuPage();
int n=0;
for(int i=0;i<str.length;i++){
try{
if(str[i].substring(str[i].lastIndexOf("=")+1).compareTo(boardid)==0){
n++;
}
}catch(StringIndexOutOfBoundsException e){}
}
return n;
}
public String[] getuId(){
String[] str=new String[User.size()/5];
int n=0;
for(int i=0;i<User.size();i+=5){
try{
str[n++]=(String)User.get(i);
}catch(ArrayIndexOutOfBoundsException e){} }
return str;
} public String[] getuName(){
String[] str=new String[(User.size()/5)];
int n=0;
for(int i=1;i<User.size();i+=5){
try{
str[n++]=(String)User.get(i);
}catch(ArrayIndexOutOfBoundsException e){}
}
return str;
}
public String[] getuPage(){
String[] str=new String[(User.size()/5)];
int n=0;
for(int i=2;i<User.size();i+=5){
try{
str[n++]=(String)User.get(i);
}catch(ArrayIndexOutOfBoundsException e){}
}
return str;
} public String[] getuIP(){
String[] str=new String[(User.size()/5)];
int n=0;
for(int i=3;i<User.size();i+=5){
try{
str[n++]=(String)User.get(i);
}catch(ArrayIndexOutOfBoundsException e){}
}
return str;
}
}
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User.remove(i)怎么这么多啊
他的大小是改变的,如果他的大小为5,那他的索引为0-4,删掉一个后就为0-3了,没有改索引
你怎么去用他指定元素啊
Date nowTime=new Date();
Long l;
if(User.size()>0){
for(int i=0;i<User.size();i+=5){//每次加5是干嘛用的,就不能加1吗,如果加5好多元素都不会读到
try{
l=Long.getLong(User.get(i+4));//不知道你这个是来干嘛的,但肯定会越界
if(nowTime.getTime()/1000-l.intValue()>=onTime){
User.remove(i);
}
}catch(ArrayIndexOutOfBoundsException e){}
catch(ClassCastException e){}
}
}
User.trimToSize();
}
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我qq:527776698~!
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