一段分页代码PaginationSupport.java

package com.iteye.common.hibernate;

import java.util.LinkedList;
import java.util.List;

public class PaginationSupport ...{

    // ---------------------------------------------------------
    // static variables
    // ---------------------------------------------------------

    // 默认每页显示条数
    public static final int DEFAULT_MAX_PAGE_ITEMS = 10;

    // 默认开始记录条数
    public static final int DEFAULT_OFFSET = 0;

    // 默认显示页码最大数
    public static final int DEFAULT_MAX_INDEX_PAGES = 10;

    // index 为索引页位置, 可以选择 "center", "forward", "half-full"
    public static final String DEFALUT_INDEX = "center";

    // ---------------------------------------------------------
    // memeber variables
    // ---------------------------------------------------------

    // 开始记录条数
    private int offset = 0;

    // 每页显示条数
    private int maxPageItems = DEFAULT_MAX_PAGE_ITEMS;

    // 显示页码最大数
    private int maxIndexPages = DEFAULT_MAX_INDEX_PAGES;

    // 总记录数
    private int totalCount;

    // 返回结果集
    private List items = new LinkedList();

    // index 为索引页位置, 可以选择 "center", "forward", "half-full"
    private String index = DEFALUT_INDEX;

    private int[] indexes = new int[0];

    public PaginationSupport() ...{
        setMaxIndexPages(DEFAULT_MAX_INDEX_PAGES);
        setTotalCount(0);
        setOffset(0);
        setItems(new LinkedList());
    }

    public PaginationSupport(List items, int totalCount) ...{
        setMaxPageItems(DEFAULT_MAX_PAGE_ITEMS);
        setTotalCount(totalCount);
        setItems(items);
        setOffset(0);
    }

    public PaginationSupport(List items, int totalCount, int offset) ...{
        setMaxPageItems(DEFAULT_MAX_PAGE_ITEMS);
        setTotalCount(totalCount);
        setItems(items);
        setOffset(offset);
    }

    public PaginationSupport(List items, int totalCount, int offset,
            int maxPageItems) ...{
        setMaxPageItems(maxPageItems);
        setTotalCount(totalCount);
        setItems(items);
        setOffset(offset);
    }

    public PaginationSupport(List items, int totalCount, int offset,
            int maxPageItems, int maxIndexPages, String index) ...{
        setMaxPageItems(maxPageItems);
        setTotalCount(totalCount);
        setItems(items);
        setOffset(offset);
        setMaxIndexPages(maxIndexPages);
        setIndex(index);
    }

    public List getItems() ...{
        return items;
    }

    public void setItems(List items) ...{
        if (items == null) ...{
            this.items = new LinkedList();
        } else ...{
            this.items = items;
        }
    }

    public int getMaxPageItems() ...{
        return maxPageItems;
    }

    public void setMaxPageItems(int maxPageItems) ...{
        this.maxPageItems = maxPageItems;
    }

    public int getTotalCount() ...{
        return totalCount;
    }

    public void setTotalCount(int totalCount) ...{
        if (totalCount > 0) ...{
            this.totalCount = totalCount;
            int count = totalCount / maxPageItems;
            if (totalCount % maxPageItems > 0) ...{
                count++;
            }
            indexes = new int[count];
            for (int i = 0; i < count; i++) ...{
                indexes[i] = maxPageItems * i;
            }
        } else ...{
            this.totalCount = 0;
        }
    }

    public int[] getIndexes() ...{
        return indexes;
    }

    public void setIndexes(int[] indexes) ...{
        this.indexes = indexes;
    }

    public int getOffset() ...{
        return offset;
    }

    public void setOffset(int startIndex) ...{
        if (totalCount <= 0)
            this.offset = 0;
        else if (startIndex >= totalCount)
            this.offset = indexes[indexes.length - 1];
        else if (startIndex < 0)
            this.offset = 0;
        else ...{
            this.offset = indexes[startIndex / maxPageItems];
        }
    }

    public int getNextIndex() ...{
        int nextIndex = getOffset() + maxPageItems;
        return nextIndex >= totalCount ? getOffset() : nextIndex;
    }

    public int getPreviousIndex() ...{
        int previousIndex = getOffset() - maxPageItems;
        return previousIndex < 0 ? DEFAULT_OFFSET : previousIndex;
    }

    /** *//**
     * @return Returns the dEFAULT_MAX_INDEX_PAGES.
     */
    public static int getDEFAULT_MAX_INDEX_PAGES() ...{
        return DEFAULT_MAX_INDEX_PAGES;
    }

    /** *//**
     * @return Returns the maxIndexPages.
     */
    public int getMaxIndexPages() ...{
        return maxIndexPages;
    }

    /** *//**
     * @param maxIndexPages
     *            The maxIndexPages to set.
     */
    public void setMaxIndexPages(int maxIndexPages) ...{
        this.maxIndexPages = maxIndexPages;
    }

    /** *//**
     * @return Returns the index.
     */
    public String getIndex() ...{
        return index;
    }

    /** *//**
     * @param index
     *            The index to set.
     */
    public void setIndex(String index) ...{
        this.index = index;
    }

    /** *//**
     * 
     * @return
     */
    public int getPage() ...{
        int page = getOffset() / this.maxPageItems + 1;
        return page;
    }

    /** *//**
     * 
     * @return
     */
    public int getPreviousPage() ...{
        if (!hasPreviousPage())
            return 1;
        return getPage() - 1;
    }

    /** *//**
     * 
     * @return
     */
    public int getTotalPage() ...{
        if (getTotalCount() == 0)
            return 0;
        else
            return getTotalCount() / this.maxPageItems + 1;
    }

    /** *//**
     * 
     * @return
     */
    public int getNextPage() ...{
        if (!hasNextPage())
            return getTotalPage();
        else
            return this.getPage() + 1;
    }

    public boolean hasNextPage() ...{
        if (getPage() >= getTotalPage())
            return false;
        else
            return true;
    }

    public boolean hasPreviousPage() ...{
        if (getPage() >= 1)
            return true;
        else
            return false;
    }
}