java分页之页面分页—@易小川

拼搏现实的明天。 2022-06-13 00:19 257阅读 0赞

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)\" οnclick=\"" + 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)\" οnclick=\""
                        + 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)\" οnclick=\"" + 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)\" οnclick=\"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)\" οnclick=\"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)\" οnclick=\"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"));
        }
    
    }