[Java代码] JDBC分页工具类

package com.iflytek.page;

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/**

* 分页工具类

*

* @author xudongwang 2012-1-19

*

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* Email:xdwangiflytek@gmail.com

*/

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public class Page {

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/**

* 总记录数

*/

private int totalRow;

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/**

* 每页记录数

*/

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private int pageSize = 10;

/**

* 当前页码

*/

private int currentCount;

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/**

* 总页数

*/

private int total;

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/**

* 起始记录下标

*/

private int beginIndex;

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/**

* 截止记录下标

*/

private int endIndex;

/**

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* 构造方法，使用总记录数，当前页码

*

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* @param totalRow

* 总记录数

* @param currentCount

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* 当前页面，从1开始

*/

public Page(int totalRow, int currentCount) {

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this.totalRow = totalRow;

this.currentCount = currentCount;

calculate();

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}

/**

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* 构造方法 ，利用总记录数，当前页面

*

* @param totalRow

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* 总记录数

* @param currentCount

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* 当前页面

* @param pageSize

* 默认10条

*/

public Page(int totalRow, int currentCount, int pageSize) {

this.totalRow = totalRow;

this.currentCount = currentCount;

this.pageSize = pageSize;

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calculate();

}

private void calculate() {

total = totalRow / pageSize + ((totalRow % pageSize) > 0 ? 1 : 0);

if (currentCount > total) {

currentCount = total;

} else if (currentCount < 1) {

currentCount = 1;

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}

beginIndex = (currentCount - 1) * pageSize;

endIndex = beginIndex + pageSize;

if (endIndex > totalRow) {

endIndex = totalRow;

}

}

public int getTotalRow() {

return totalRow;

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}

public int getPageSize() {

return pageSize;

}

public int getCurrentCount() {

return currentCount;

}

public int getTotal() {

return total;

}

public int getBeginIndex() {

return beginIndex;

}

public int getEndIndex() {

return endIndex;

}

}

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继续

在后台获取前台传进来的页码 //从页面取得页码

int currentPage = 1;

try {

currentPage = Integer.parseInt(request.getParameter("currentPage"));

} catch (Exception ex) {}

//取得总记录数，创建Page对象

int totalRow = studentDao.getAllStudents();//通过select count 取得总记录数

Page page = new Page(totalRow, currentPage);

studentDao.list(page);

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数据访问层， StduentDao.java

public List<Stduent> getStudentsByPage(Page page) {

List<Stduent> students = new ArrayList<Stduent>();

try {

String sql = "SELECT id,name,email FROM tbl_stduent";

Connection conn = null;

try {

conn = DbUtil.getConnection();

Statement statement = conn.createStatement();

statement.setMaxRows(page.getEndIndex());//关键代码，设置最大记录数为当前页记录的截止下标

ResultSet resultSet = statement.executeQuery(sql);

if (page.getBeginIndex() > 0) {

resultSet.absolute(page.getBeginIndex());//关键代码，直接移动游标为当前页起始记录处

}

while (resultSet.next()) {

Stduent student = new Student();

……

students.add(student);

}

resultSet.close();

statement.close();

} finally {

if (conn != null) {

conn.close();

}

}

} catch (SQLException e) {

e.printStackTrace();

}

return students;

}

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