java分页之页面分页—@易小川

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import java.util.ArrayList;import java.util.List;/** *  * @author cheney *  * @date Aug 31, 2012 */public class PageModel<T> {    private int page = 1; // 当前页    public int totalPages = 0; // 总页数    private int pageRecorders;// 每页5条数据    private int totalRows = 0; // 总数据数    private int pageStartRow = 0;// 每页的起始数    private int pageEndRow = 0; // 每页显示数据的终止数    private boolean hasNextPage = false; // 是否有下一页    private boolean hasPreviousPage = false; // 是否有前一页    private List<T> list;    /**     *      * @param list     * @param pageRecorders     */    public PageModel(List<T> list, int pageRecorders) {        init(list, pageRecorders);// 通过对象集，记录总数划分    }    /** */    /**     * 初始化list，并告之该list每页的记录数     *      * @param list     * @param pageRecorders     */    public void init(List<T> list, int pageRecorders) {        this.pageRecorders = pageRecorders;        this.list = list;        totalRows = list.size();        hasPreviousPage = false;        if ((totalRows % pageRecorders) == 0) {            totalPages = totalRows / pageRecorders;        } else {            totalPages = totalRows / pageRecorders + 1;        }        if (page >= totalPages) {            hasNextPage = false;        } else {            hasNextPage = true;        }        if (totalRows < pageRecorders) {            this.pageStartRow = 0;            this.pageEndRow = totalRows;        } else {            this.pageStartRow = 0;            this.pageEndRow = pageRecorders;        }    }    public String displayForPage(String method) {        StringBuffer sb = new StringBuffer();        sb.append("<div class=\"w-page\"><label class=\"fr\">");        // 判断是否有上一页        if (this.isHasPreviousPage()) {            sb.append("<a href=\"javascript:void(0)\" onclick=\"" + method                    + "('" + String.valueOf(this.getPage() - 1)                    + "');return false;\">上一页</a>");        } else {            sb.append("<span class=\"disabled\">上一页</span>");        }        // 中间显示        for (int i = 1; i <= this.getTotalPages(); i++) {            String spanClzz = "<a href=\"javascript:void(0)\" onclick=\""                    + method + "('" + String.valueOf(i) + "');return false;\">"                    + i + "</a>";            if (this.page == i) {                spanClzz = "<span class='current'>" + i + "</span>";            }            sb.append(spanClzz);            // 当大于9页数的时候才进行分页显示            if (this.getTotalPages() - 2 > 7) {                if (i == 5) {                    i = this.getTotalPages() - 2;                    sb.append("...");                }            }        }        // 判断是否有下一页        if (this.isHasNextPage()) {            sb.append("<a href=\"javascript:void(0)\" onclick=\"" + method                    + "('" + String.valueOf(this.getPage() + 1)                    + "');return false;\">下一页</a>");        } else {            sb.append("<span class=\"disabled\">下一页</span>");        }        sb.append("</div>");        return sb.toString();    }    public String displayForPage() {        StringBuffer sb = new StringBuffer();        sb.append("<div class=\"w-page\"><label class=\"fr\">");        // 判断是否有上一页        if (this.isHasPreviousPage()) {            sb                    .append("<a href=\"javascript:void(0)\" onclick=\"findDistResult('"                            + String.valueOf(this.getPage() - 1)                            + "');return false;\">上一页</a>");        } else {            sb.append("<span class=\"disabled\">上一页</span>");        }        // 中间显示        for (int i = 1; i <= this.getTotalPages(); i++) {            String spanClzz = "<a href=\"javascript:void(0)\" onclick=\"findDistResult('"                    + String.valueOf(i) + "');return false;\">" + i + "</a>";            if (this.page == i) {                spanClzz = "<span class='current'>" + i + "</span>";            }            sb.append(spanClzz);            // 当大于9页数的时候才进行分页显示            if (this.getTotalPages() - 2 > 7) {                if (i == 5) {                    i = this.getTotalPages() - 2;                    sb.append("...");                }            }        }        // 判断是否有下一页        if (this.isHasNextPage()) {            sb                    .append("<a href=\"javascript:void(0)\" onclick=\"findDistResult('"                            + String.valueOf(this.getPage() + 1)                            + "');return false;\">下一页</a>");        } else {            sb.append("<span class=\"disabled\">下一页</span>");        }        sb.append("</div>");        return sb.toString();    }    // 判断要不要分页    public boolean isNext() {        return list.size() > 5;    }    public void setHasPreviousPage(boolean hasPreviousPage) {        this.hasPreviousPage = hasPreviousPage;    }    /**     *      * @return     */    public List<T> getNextPage() {        page = page + 1;        disposePage();        return getObjects(page);    }    /**     * 处理分页     */    private void disposePage() {        if (page == 0) {            page = 1;        }        if ((page - 1) > 0) {            hasPreviousPage = true;        } else {            hasPreviousPage = false;        }        if (page >= totalPages) {            hasNextPage = false;        } else {            hasNextPage = true;        }    }    /**     * 上一页     *      * @return     */    public List<T> getPreviousPage() {        page = page - 1;        if ((page - 1) > 0) {            hasPreviousPage = true;        } else {            hasPreviousPage = false;        }        if (page >= totalPages) {            hasNextPage = false;        } else {            hasNextPage = true;        }        return getObjects(page);    }    /**     * 获取第几页的内容     *      * @param page     * @return     */    public List<T> getObjects(int page) {        if (page == 0) {            this.setPage(1);            page = 1;        } else {            this.setPage(page);        }        this.disposePage();        if (page * pageRecorders < totalRows) {// 判断是否为最后一页            pageEndRow = page * pageRecorders;            pageStartRow = pageEndRow - pageRecorders;        } else {            pageEndRow = totalRows;            pageStartRow = pageRecorders * (totalPages - 1);        }        List<T> objects = null;        if (!list.isEmpty()) {            objects = list.subList(pageStartRow, pageEndRow);        }        return objects;    }    /**     * 第一页     *      * @return     */    public List<T> getFistPage() {        if (this.isNext()) {            return list.subList(0, pageRecorders);        } else {            return list;        }    }    /**     * @return the page     */    public int getPage() {        return page;    }    /**     * @param page     *            the page to set     */    public void setPage(int page) {        this.page = page;    }    /**     * @return the totalPages     */    public int getTotalPages() {        return totalPages;    }    /**     * @param totalPages     *            the totalPages to set     */    public void setTotalPages(int totalPages) {        this.totalPages = totalPages;    }    /**     * @return the pageRecorders     */    public int getPageRecorders() {        return pageRecorders;    }    /**     * @param pageRecorders     *            the pageRecorders to set     */    public void setPageRecorders(int pageRecorders) {        this.pageRecorders = pageRecorders;    }    /**     * @return the totalRows     */    public int getTotalRows() {        return totalRows;    }    /**     * @param totalRows     *            the totalRows to set     */    public void setTotalRows(int totalRows) {        this.totalRows = totalRows;    }    /**     * @return the pageStartRow     */    public int getPageStartRow() {        return pageStartRow;    }    /**     * @param pageStartRow     *            the pageStartRow to set     */    public void setPageStartRow(int pageStartRow) {        this.pageStartRow = pageStartRow;    }    /**     * @return the pageEndRow     */    public int getPageEndRow() {        return pageEndRow;    }    /**     * @param pageEndRow     *            the pageEndRow to set     */    public void setPageEndRow(int pageEndRow) {        this.pageEndRow = pageEndRow;    }    /**     * @return the hasNextPage     */    public boolean isHasNextPage() {        return hasNextPage;    }    /**     * @param hasNextPage     *            the hasNextPage to set     */    public void setHasNextPage(boolean hasNextPage) {        this.hasNextPage = hasNextPage;    }    /**     * @return the list     */    public List<T> getList() {        return list;    }    /**     * @param list     *            the list to set     */    public void setList(List<T> list) {        this.list = list;    }    /**     * @return the hasPreviousPage     */    public boolean isHasPreviousPage() {        return hasPreviousPage;    }    /*     *      * @param args     */    public static void main(String[] args) {        List<String> list = new ArrayList<String>();        list.add("a");        list.add("b");        list.add("c");        list.add("d");        list.add("e");        list.add("f");        list.add("g");        list.add("h");        list.add("h");        list.add("i");        list.add("j");        System.out.println(list.size());        PageModel<String> pm = new PageModel<String>(list, 3);// 每页显示条数        pm.getObjects(1);        System.out.println(pm.displayForPage("disResult"));    }}
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