pageutil.java

是一个Bug系统

/*
 * 创建日期 2006-2-25
 *
 */
package com.runwit.common.util;

/**
 * @date 2006-2-25 @author user
 *
 */
public class PageUtil {
    
    private int pageSize;//页面显示条数 
    private int recordCount;//记录总数
    private int currentPage; //当前页
    
    public PageUtil(int pageSize, int recordCount, int currentPage) {
        this.pageSize = pageSize;
        this.recordCount = recordCount;
        setCurrentPage(currentPage);
        
    }
    
    public PageUtil(int pageSize, int recordCount) {
        this(pageSize, recordCount, 1);
    }
    
    //总页数
    public int getPageCount() {
        int size = recordCount/pageSize;
        int mod = recordCount % pageSize;
        if(mod != 0)
            size++;
        return recordCount == 0 ? 1 : size;
    }
    
    //包含，起始索引为0
    public int getFromIndex() {
        System.out.println("from index:"+(currentPage-1) * pageSize);
        return (currentPage-1) * pageSize;
    }
    
    //不包含
    public int getToIndex() {
        System.out.println("to index:"+Math.min(recordCount, currentPage * pageSize));
        return  Math.min(recordCount, currentPage * pageSize);
    }
    
    public int getCurrentPage() {
        return currentPage;
    }
    public void setCurrentPage(int currentPage) {
        int validPage = currentPage <= 0 ? 1 : currentPage;
        validPage = validPage > getPageCount() ? getPageCount() : validPage;
        this.currentPage = validPage;
    }
    public int getPageSize() {
        return pageSize;
    }
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }
    public int getRecordCount() {
        return recordCount;
    }
    public void setRecordCount(int recordCount) {
        this.recordCount = recordCount;
    }
}