关于JSP数据库连接池的有关问题－弄不出来真郁闷
日期：2014-05-18 浏览次数：20688 次
关于JSP数据库连接池的问题－弄不出来真郁闷
在网上看到的一个例子，我想连ACCESS数据库，弄不出来，现把代码贴出来：
网站根目录下 ConnPool.jsp ：
<%@ page contentType= "text/html; charset=GBK " %>
<%@ page import = "java.sql.* " %>
<jsp:useBean id= "connManager " scope= "page " class= "mybean.DBConnManager " />
<html>
<head>
<title>
购物商城首页
</title>
</head>
<body bgcolor= "#B0C4DE ">
<center> <h1> 欢迎访问本购物商城 </h1> </center>
<%
String accstr=request.getRealPath( "data/shopping.mdb "); //设置路径
connManager.setConnStr(accstr);
Connection connA=connManager.getConnection( "access ");
if (connA==null)
{
out.print( "数据库正忙,请稍后再访问 ");
}
Statement stmtA=connA.createStatement();
String sql= "select * from userinfo ";
ResultSet rs=stmtA.executeQuery(sql);
while (rs.next())
{
out.print( " <table border= '0 '> ");
out.print( " <tr> ");
out.print( " <td> "+rs.getString( "username ")+ " </td> ");
out.print( " <td> "+rs.getString( "userpass ")+ " </td> ");
out.print( " </tr> </table> ");
}
rs.close();
stmtA.close();
connManager.returnConnection( "access ",connA);
%>
</body>
</html>
网站根目录 WEB-INF\classes\ 下两个JAVA文件：
DBConnPool.java ：
package mybean;
import java.util.*;
import java.sql.*;
public class DBConnPool {
private int using=0; //正在使用连接的数量
private Vector connections=new Vector(); //目前可用的连接数 private int maxconn=0; //最大连接数
private String poolname= " "; //连接池名
private String dbid= " "; //数据库标识
private String drivername= " "; //驱动程序名
private String username= " "; //数据库帐号
private String passwd= " "; //数据库密码
public DBConnPool(String poolname,String dbid,String drivername,
String username,String passwd,int maxconn){
this.poolname=poolname;
this.drivername=drivername;
this.dbid =dbid;
this.username =username;
this.passwd=passwd;
this.maxconn=maxconn;
}
在网上看到的一个例子，我想连ACCESS数据库，弄不出来，现把代码贴出来：
网站根目录下 ConnPool.jsp ：
<%@ page contentType= "text/html; charset=GBK " %>
<%@ page import = "java.sql.* " %>
<jsp:useBean id= "connManager " scope= "page " class= "mybean.DBConnManager " />
<html>
<head>
<title>
购物商城首页
</title>
</head>
<body bgcolor= "#B0C4DE ">
<center> <h1> 欢迎访问本购物商城 </h1> </center>
<%
String accstr=request.getRealPath( "data/shopping.mdb "); //设置路径
connManager.setConnStr(accstr);
Connection connA=connManager.getConnection( "access ");
if (connA==null)
{
out.print( "数据库正忙,请稍后再访问 ");
}
Statement stmtA=connA.createStatement();
String sql= "select * from userinfo ";
ResultSet rs=stmtA.executeQuery(sql);
while (rs.next())
{
out.print( " <table border= '0 '> ");
out.print( " <tr> ");
out.print( " <td> "+rs.getString( "username ")+ " </td> ");
out.print( " <td> "+rs.getString( "userpass ")+ " </td> ");
out.print( " </tr> </table> ");
}
rs.close();
stmtA.close();
connManager.returnConnection( "access ",connA);
%>
</body>
</html>
网站根目录 WEB-INF\classes\ 下两个JAVA文件：
DBConnPool.java ：
package mybean;
import java.util.*;
import java.sql.*;
public class DBConnPool {
private int using=0; //正在使用连接的数量
private Vector connections=new Vector(); //目前可用的连接数 private int maxconn=0; //最大连接数
private String poolname= " "; //连接池名
private String dbid= " "; //数据库标识
private String drivername= " "; //驱动程序名
private String username= " "; //数据库帐号
private String passwd= " "; //数据库密码
public DBConnPool(String poolname,String dbid,String drivername,
String username,String passwd,int maxconn){
this.poolname=poolname;
this.drivername=drivername;
this.dbid =dbid;
this.username =username;
this.passwd=passwd;
this.maxconn=maxconn;
}
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