package JavaBean;
public class TransferManager {
DBAction db=new DBAction();
private String sql="";
public TransferManager(){}
public boolean checkTransferUserID(String MyUserID)//检查账号是否存在
{
sql="select * from users where userID='"+MyUserID+"'";
try{
if(db.Query(sql)!=null){
System.out.print("账号存在！");
return true;
}else
{
System.out.print("账号不存在！");
}
}catch(Exception e){
e.printStackTrace();
System.out.print("账号不存在！");
}
finally{
db.Close();
}
return false;
}
public boolean checkTransferOutUserID(String MyUserID,String password)//检查转出账号是否存在
{
sql="select * from users where userID='"+MyUserID+"' and password='"+password+"'";
try{
if(db.Query(sql)!=null){
System.out.print("转出账号存在！");
return true;
}
}catch(Exception e){
System.out.print("转出账号密码不正确！");
e.printStackTrace();
}
finally{
db.Close();
}
return false;
}
public boolean checkTransferInUserID(String YouUserID)//检查转入账号是否存在
{
sql="select * from users where userID='"+YouUserID+"'";
try{
if(db.Query(sql)!=null){
System.out.print("转入账号存在！");
return true;
}
}catch(Exception e){
System.out.print("转入账号不存在！");
e.printStackTrace();
}finally{
db.Close();
}
return false;
}
public boolean checkTransferMoney(String MyUserID,double Money)//检查转出金额是否大于账户余额
{
sql="select * from users where userID='"+MyUserID+"' and assets >="+Money+"";
try{
if(db.Query(sql)!=null){
System.out.print("转入金额足够存在！");
return true;
}
}catch(Exception e){
System.out.print("转入金额不足存在！");
e.printStackTrace();
}finally{
db.Close();
}
return false;
}
public boolean writeLog(String tranID,String operation,double Origamount,double Payments,String tradetime){
sql="insert into transRecord values('"+tranID+"','"+operation+"',"+Origamount+","+Payments+",'"+tradetime+"')";
try{
if(db.Update(sql)==1)
{
System.out.print("写回日志文件！");
return true;
}
}catch(Exception e){
System.out.print("写回日志文件失败！");
e.printStackTrace();
}finally{
db.Close();
}
return false;
}
public boolean addMoney(String YouUserID,double Money){
sql="update users set assets=assets+"+Money+" where userID='"+YouUserID+"'";
try{
if(db.Update(sql)==1)
{
System.out.print("入账成功！");
return true;
}
}catch(Exception e){
System.out.print("入账失败！");
e.printStackTrace();
}finally{
db.Close();
}
return false;
}
public boolean subtractMoney(String MyUserID,double Money){
sql="update users set assets=assets-"+Money+" where userID+'"+MyUserID+"'";
try{
if(db.Update(sql)==1)
{
System.out.print("出账成功！");
return true;
}
}catch(Exception e){
System.out.print("出账失败！");
e.printStackTrace();
}finally{
db.Close();
}
return true;
}
public boolean resendMessage(boolean flag){
if(flag==true)
{
System.out.print("转账成功！");
return true;
}
System.out.print("转账失败！");
return false;
}
}我的servlet调用：
package Servlet;
import JavaBean.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class Transfer extends HttpServlet {
private double Origamount;
public Transfer(){
super();
System.out.print("实例化Servlet！");
}
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy();
System.out.print("销毁Servlet！");
// Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doPost(request,response);
System.out.print("正在处理Servlet！");
} /**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html;charset=gbk");
response.setCharacterEncoding("gbk");
request.setCharacterEncoding("gbk");
PrintWriter out = response.getWriter();
try{
String MyUserID=request.getParameter("MyUserID");
String password=request.getParameter("password");
String YouUserID=request.getParameter("YouUserID");
String operation="转账";
String P=request.getParameter("Money");
double Payments=Double.parseDouble(P);
java.text.SimpleDateFormat date=new java.text.SimpleDateFormat("yyyy-MM-dd");
String tradetime=date.format( new java.util.Date());
String m=request.getParameter("Money");
double Money=Double.parseDouble(m);
request.setCharacterEncoding("gbk");
response.setCharacterEncoding("gbk");
DBAction db=new DBAction();
TransferManager tm=new TransferManager();
String sql="select assets from users where userID='"+MyUserID+"'";
ResultSet rs=db.Query(sql);
if(rs.next())
{
String O;
O = rs.getString("assets");
Origamount=Double.parseDouble(O);
}
try{
if(tm.checkTransferInUserID(MyUserID)==false)
{
out.print("<script language='javascript'>alert('转出账号不存在！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferOutUserID(MyUserID, password)==false)
{
out.print("<script language='javascript'>alert('密码有误，请重新输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferInUserID(YouUserID)==false)
{
out.print("<script language='javascript'>alert('转入账号不存在，请查询输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferMoney(MyUserID, Money)==false)
{
out.print("<script language='javascript'>alert('您的余额不足，请查询输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}else
{
String tranID = null;
String sql1="select top 1 tranID from transRecord order by tranID desc";
ResultSet rs1=db.Query(sql1);
if(rs.next())
{
String a=rs1.getString("tranID");
double tranI=Double.parseDouble(a)+1;
tranID=new Double(tranI).toString();
if(tm.writeLog(tranID, operation, Origamount, Payments, tradetime)){
try{
db.getCon().setAutoCommit(false);
tm.addMoney(YouUserID, Money);
tm.subtractMoney(MyUserID, Money);
db.getCon().commit();
operation="入账";
tm.writeLog(tranID, operation, Origamount, Payments, tradetime);
}catch(Exception e){
db.getCon().rollback();
}
}
}
sql="select top 1 operation from transRecord order by tranID desc ";
if(rs.next()){
operation=rs.getString("operation");
}
if(operation.equals("入账"))
{
if(tm.resendMessage(true))
{
out.print("<html><body>");
out.print("转账成功！三秒后自动跳转到首页！");
out.print("</body></html>");
response.setHeader("Refresh","3;URL=Userindex.jsp");
}
}else{
out.print("<script language='javascript'>alert('由于网络原因，转账失敗，请稍后再试！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
}
}catch(Exception e){
try
{
db.getCon().rollback();
}
catch(Exception ex)
{
ex.printStackTrace();
}
e.printStackTrace();
return; }finally{
db.Close();
}
out.flush();
out.close();
}catch(Exception e){
e.printStackTrace();
}
System.out.print("正在处理Servlet！");
} /**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
super.init();
System.out.print("初始化Servlet！");
// Put your code here
}}
为什么我无论输入什么他都正确的啊！（除非有空字符串，但我在jsp页面中由函数限制了）
然后我随便输入，就有：
弹出对话框：由于网络原因，转账失败，请稍后再试！
然后：
转入账号存在！转出账号存在！转入账号存在！转入金额足够存在！正在处理Servlet！
这是怎么回事？请大家帮忙看看~
public class TransferManager {
DBAction db=new DBAction();
private String sql="";
public TransferManager(){}
public boolean checkTransferUserID(String MyUserID)//检查账号是否存在
{
sql="select * from users where userID='"+MyUserID+"'";
try{
if(db.Query(sql)!=null){
System.out.print("账号存在！");
return true;
}else
{
System.out.print("账号不存在！");
}
}catch(Exception e){
e.printStackTrace();
System.out.print("账号不存在！");
}
finally{
db.Close();
}
return false;
}
public boolean checkTransferOutUserID(String MyUserID,String password)//检查转出账号是否存在
{
sql="select * from users where userID='"+MyUserID+"' and password='"+password+"'";
try{
if(db.Query(sql)!=null){
System.out.print("转出账号存在！");
return true;
}
}catch(Exception e){
System.out.print("转出账号密码不正确！");
e.printStackTrace();
}
finally{
db.Close();
}
return false;
}
public boolean checkTransferInUserID(String YouUserID)//检查转入账号是否存在
{
sql="select * from users where userID='"+YouUserID+"'";
try{
if(db.Query(sql)!=null){
System.out.print("转入账号存在！");
return true;
}
}catch(Exception e){
System.out.print("转入账号不存在！");
e.printStackTrace();
}finally{
db.Close();
}
return false;
}
public boolean checkTransferMoney(String MyUserID,double Money)//检查转出金额是否大于账户余额
{
sql="select * from users where userID='"+MyUserID+"' and assets >="+Money+"";
try{
if(db.Query(sql)!=null){
System.out.print("转入金额足够存在！");
return true;
}
}catch(Exception e){
System.out.print("转入金额不足存在！");
e.printStackTrace();
}finally{
db.Close();
}
return false;
}
public boolean writeLog(String tranID,String operation,double Origamount,double Payments,String tradetime){
sql="insert into transRecord values('"+tranID+"','"+operation+"',"+Origamount+","+Payments+",'"+tradetime+"')";
try{
if(db.Update(sql)==1)
{
System.out.print("写回日志文件！");
return true;
}
}catch(Exception e){
System.out.print("写回日志文件失败！");
e.printStackTrace();
}finally{
db.Close();
}
return false;
}
public boolean addMoney(String YouUserID,double Money){
sql="update users set assets=assets+"+Money+" where userID='"+YouUserID+"'";
try{
if(db.Update(sql)==1)
{
System.out.print("入账成功！");
return true;
}
}catch(Exception e){
System.out.print("入账失败！");
e.printStackTrace();
}finally{
db.Close();
}
return false;
}
public boolean subtractMoney(String MyUserID,double Money){
sql="update users set assets=assets-"+Money+" where userID+'"+MyUserID+"'";
try{
if(db.Update(sql)==1)
{
System.out.print("出账成功！");
return true;
}
}catch(Exception e){
System.out.print("出账失败！");
e.printStackTrace();
}finally{
db.Close();
}
return true;
}
public boolean resendMessage(boolean flag){
if(flag==true)
{
System.out.print("转账成功！");
return true;
}
System.out.print("转账失败！");
return false;
}
}我的servlet调用：
package Servlet;
import JavaBean.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class Transfer extends HttpServlet {
private double Origamount;
public Transfer(){
super();
System.out.print("实例化Servlet！");
}
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy();
System.out.print("销毁Servlet！");
// Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doPost(request,response);
System.out.print("正在处理Servlet！");
} /**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html;charset=gbk");
response.setCharacterEncoding("gbk");
request.setCharacterEncoding("gbk");
PrintWriter out = response.getWriter();
try{
String MyUserID=request.getParameter("MyUserID");
String password=request.getParameter("password");
String YouUserID=request.getParameter("YouUserID");
String operation="转账";
String P=request.getParameter("Money");
double Payments=Double.parseDouble(P);
java.text.SimpleDateFormat date=new java.text.SimpleDateFormat("yyyy-MM-dd");
String tradetime=date.format( new java.util.Date());
String m=request.getParameter("Money");
double Money=Double.parseDouble(m);
request.setCharacterEncoding("gbk");
response.setCharacterEncoding("gbk");
DBAction db=new DBAction();
TransferManager tm=new TransferManager();
String sql="select assets from users where userID='"+MyUserID+"'";
ResultSet rs=db.Query(sql);
if(rs.next())
{
String O;
O = rs.getString("assets");
Origamount=Double.parseDouble(O);
}
try{
if(tm.checkTransferInUserID(MyUserID)==false)
{
out.print("<script language='javascript'>alert('转出账号不存在！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferOutUserID(MyUserID, password)==false)
{
out.print("<script language='javascript'>alert('密码有误，请重新输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferInUserID(YouUserID)==false)
{
out.print("<script language='javascript'>alert('转入账号不存在，请查询输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferMoney(MyUserID, Money)==false)
{
out.print("<script language='javascript'>alert('您的余额不足，请查询输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}else
{
String tranID = null;
String sql1="select top 1 tranID from transRecord order by tranID desc";
ResultSet rs1=db.Query(sql1);
if(rs.next())
{
String a=rs1.getString("tranID");
double tranI=Double.parseDouble(a)+1;
tranID=new Double(tranI).toString();
if(tm.writeLog(tranID, operation, Origamount, Payments, tradetime)){
try{
db.getCon().setAutoCommit(false);
tm.addMoney(YouUserID, Money);
tm.subtractMoney(MyUserID, Money);
db.getCon().commit();
operation="入账";
tm.writeLog(tranID, operation, Origamount, Payments, tradetime);
}catch(Exception e){
db.getCon().rollback();
}
}
}
sql="select top 1 operation from transRecord order by tranID desc ";
if(rs.next()){
operation=rs.getString("operation");
}
if(operation.equals("入账"))
{
if(tm.resendMessage(true))
{
out.print("<html><body>");
out.print("转账成功！三秒后自动跳转到首页！");
out.print("</body></html>");
response.setHeader("Refresh","3;URL=Userindex.jsp");
}
}else{
out.print("<script language='javascript'>alert('由于网络原因，转账失敗，请稍后再试！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
}
}catch(Exception e){
try
{
db.getCon().rollback();
}
catch(Exception ex)
{
ex.printStackTrace();
}
e.printStackTrace();
return; }finally{
db.Close();
}
out.flush();
out.close();
}catch(Exception e){
e.printStackTrace();
}
System.out.print("正在处理Servlet！");
} /**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
super.init();
System.out.print("初始化Servlet！");
// Put your code here
}}
为什么我无论输入什么他都正确的啊！（除非有空字符串，但我在jsp页面中由函数限制了）
然后我随便输入，就有：
弹出对话框：由于网络原因，转账失败，请稍后再试！
然后：
转入账号存在！转出账号存在！转入账号存在！转入金额足够存在！正在处理Servlet！
这是怎么回事？请大家帮忙看看~
public boolean checkTransferUserID(String MyUserID)//检查账号是否存在
{
sql="select * from users where userID='"+MyUserID+"'";
try{
if(db.Query(sql)!=null){
System.out.print("账号存在！");
return true;
}else
{
System.out.print("账号不存在！");
}
}catch(Exception e){
e.printStackTrace();
System.out.print("账号不存在！");
}
finally{
db.Close();
}
return false;
}
这个函数，和
if(tm.checkTransferInUserID(MyUserID)==false)
{
out.print("<script language='javascript'>alert('转出账号不存在！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
就这两个，都无法正确运行……
刚学的，不太懂啊……
Source not found for GenericObjectPool.borrowObject() line: 766
Source not found for CursorableLinkedList.removeFirst() line: 571
TOMCAT:
2010-6-28 15:22:24 org.apache.catalina.core.AprLifecycleListener init
信息: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\MyEclipse 7.0M1\bin;C:\Program Files\Apache Software Foundation\Tomcat 6.0\bin
2010-6-28 15:22:24 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2010-6-28 15:22:24 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 906 ms
2010-6-28 15:22:24 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2010-6-28 15:22:24 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.10
2010-6-28 15:22:24 org.apache.catalina.startup.HostConfig deployWAR
信息: Deploying web application archive 11.war
2010-6-28 15:22:27 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2010-6-28 15:22:27 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2010-6-28 15:22:27 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/78 config=null
2010-6-28 15:22:28 org.apache.catalina.startup.Catalina start
信息: Server startup in 3516 ms
实例化Servlet！初始化Servlet！转入账号存在！密码正确！转入账号存在！org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool exhausted
at org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:103)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
at JavaBean.DBAction.getCon(DBAction.java:26)
at JavaBean.DBAction.Query(DBAction.java:37)
at JavaBean.TransferManager.checkTransferMoney(TransferManager.java:66)
at Servlet.Transfer.doPost(Transfer.java:105)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
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:228)
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:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Unknown Source)
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
at org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:756)
at org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95)
... 19 more
转入金额足够！
（我输入的全都是不对的数据，数据库没有的）
天哪！我快抓狂了！
{
out.print("<script language='javascript'>alert('转出账号不存在！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferOutUserID(MyUserID, password)==false)
{
out.print("<script language='javascript'>alert('密码有误，请重新输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferInUserID(YouUserID)==false)
{
out.print("<script language='javascript'>alert('转入账号不存在，请查询输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}
else if(tm.checkTransferMoney(MyUserID, Money)==false)
{
out.print("<script language='javascript'>alert('您的余额不足，请查询输入！')</script>");
response.setHeader("Refresh","0;URL=trade.jsp");
}else
{
String tranID = null;
String sql1="select top 1 tranID from transRecord order by tranID desc";
ResultSet rs1=db.Query(sql1);
if(rs.next())
{
String a=rs1.getString("tranID");
double tranI=Double.parseDouble(a)+1;
tranID=new Double(tranI).toString();
if(tm.writeLog(tranID, operation, Origamount, Payments, tradetime)){
try{
db.getCon().setAutoCommit(false);
tm.addMoney(YouUserID, Money);
tm.subtractMoney(MyUserID, Money);
db.getCon().commit();
operation="入账";
tm.writeLog(tranID, operation, Origamount, Payments, tradetime);
}catch(Exception e){
db.getCon().rollback();
}
}
}
sql="select top 1 operation from transRecord order by tranID desc ";
if(rs.next()){
operation=rs.getString("operation");
}
把==改成.equals试下
Servlet:
package Servlet;
import JavaBean.*;
import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class ModifyAccount extends HttpServlet { /**
*
*/
private static final long serialVersionUID = 1L; /**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
} /**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doPost(request,response);
} /**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
PrintWriter out = response.getWriter();
String userID=request.getParameter("MyUserID");
String password=request.getParameter("password");
String newpsw1=request.getParameter("newpassword1");
String newpsw2=request.getParameter("newpassword2");
ModifyAccountManager mam=new ModifyAccountManager();
try{
mam.getUserData(userID, password, newpsw1, newpsw2);
if(mam.checkUserID(userID)==false){
out.print("用户账号不存在！");
}else{
out.print("该账号存在！");
}
}catch(Exception e){
e.toString();
e.printStackTrace();
}
out.flush();
out.close();
} /**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}}
JaveBean:
package JavaBean;
import java.sql.*;
public class ModifyAccountManager {
DBAction db=new DBAction();
ResultSet rs=null;
String Authority="";
String sql="";
boolean flag;
String userID="";
String password="";
String newpsw1="";
String newpsw2="";
public void getUserData(String userID,String password,String newpsw1,String newpsw2){
this.userID=userID;
this.password=password;
this.newpsw1=newpsw1;
this.newpsw2=newpsw2;
}
public boolean checkUserID(String userID){
flag=false;
sql="select * from users where userID='"+userID+"'";
rs=db.Query(sql);
if(rs==null){
System.out.print("用户名不存在！");
}else{
flag=true;
}
return flag;
}
public boolean Modify(){
flag=false;
sql="select * from users where userID='"+userID+"'";
rs=db.Query(sql);
if(rs==null){
System.out.print("用户名不存在！");
}
return flag;
}}