JSP分页之假分页及MVC实现

 MVC是由模型层，视图层，控制层组成，MVC提高了开发效率，便于维护
分页是Web开发中的一个重要的功能，那怎样实现分页呢？？？
假分页是指查询出所有的数据，只显示需要的数据，它完全由程序实现，开发效率不高，但容易实现
代码如下:
一.模型层
UserInfo(JavaBean的实现，传递数据）
package com.feng.test;
import java.io.Serializable;
public class UserInfo implements Serializable {
private int userid;
private String username;
private String password;
public int getUserid() {
return userid;
}
public void setUserid(int userid) {
this.userid = userid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}

二.数据层
 DataBae(数据库的连接)
package com.feng.test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public final class DataBase {
private final static String DRIVER = "oracle.jdbc.driver.OracleDriver";
private final static String URL = "jdbc:oracle:thin:@localhost:1521:Oracle9i";
private final static String USER = "scott";
private final static String PWD = "tiger";
private DataBase() {
}
public static Connection getConnection() {
Connection conn = null;
try {
Class.forName(DRIVER);
conn = DriverManager.getConnection(URL, USER, PWD);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
public static void closeConnection(Connection conn) {
try {
if (conn != null) {
if (!conn.isClosed()) {
conn.close();
}
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public static PreparedStatement getPreparedStatement(Connection conn,
String sql) {
PreparedStatement pstmt = null;
try {
pstmt = conn.prepareStatement("sql");