jsp中封装数据库操作，例如数据库连接，条件查询等到javabean中，怎么做？

DBConnectionManager.java

import java.sql.*;
public class DBConnectionManager {
private String driverName="com.microsoft.jdbc.sqlserver.SQLServerDriver";
private String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=demo";
private String user="sa";
private String password="";
public String getDriverName() {
return driverName;
}
public void setDriverName(String driverName) {
this.driverName = driverName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public Connection getConnection(