pagehelper.java~2~

来自「hibernate+spring的相片上传项目」· JAVA~2~ 代码 · 共 387 行 · 第 1/2 页

                pageBarBuffer.append(" ");

                // 首页
                StringBuffer firstPageBuffer = new StringBuffer();
                if (totalPage > 1 && page != 1) {
                        firstPageBuffer.append(url + "?page=1");
                        if (isHaveParam) {
                                firstPageBuffer.append("&" + param);
                        }
                        display1 = true;
                }

                // 上一页
                StringBuffer perPageBuffer = new StringBuffer();
                if (page > 1) {
                        perPageBuffer.append(url + "?page=" + (page - 1));
                        if (isHaveParam) {
                                perPageBuffer.append("&" + param);
                        }
                        display2 = true;
                }

                // 下一页
                StringBuffer nextPageBuffer = new StringBuffer();
                if (page < totalPage) {
                        nextPageBuffer.append(url + "?page=" + (page + 1));
                        if (isHaveParam) {
                                nextPageBuffer.append("&" + param);
                        }
                        display3 = true;
                }

                // 最后一页
                StringBuffer lastPageBuffer = new StringBuffer();
                if (totalPage > 1 && page < totalPage) {
                        lastPageBuffer.append(url + "?page=" + totalPage);
                        if (isHaveParam) {
                                lastPageBuffer.append("&" + param);
                        }
                        display4 = true;
                }

                // 每页显示记录数
                StringBuffer numPageBuffer = new StringBuffer();
                numPageBuffer.append("<select name=\"perPage\" ");
                numPageBuffer.append(" onchange=\"");
                numPageBuffer.append(" if(this.options[this.selectedIndex]");
                numPageBuffer.append(".value!=''){");
                numPageBuffer.append(" location='" + url + "?");
                if (isHaveParam) {
                        numPageBuffer.append(param + "&");
                }
                numPageBuffer.append("page=1");
                numPageBuffer.append("&perPage='+this.options[this.selectedIndex]");
                numPageBuffer.append(".value;}\">");
                for (int i = 1; i <= cNum; i++) {
                        numPageBuffer.append("<option value=\"" + (i * 10) + "\"");
                        if ((i * 10) == perPage) {
                                numPageBuffer.append(" selected>" + (i * 10) + "</option>");
                        } else {
                                numPageBuffer.append(">" + (i * 10) + "</option>");
                        }
                }
                numPageBuffer.append("</select>");

                // 跳转到第几页
                StringBuffer jumpPageBuffer = new StringBuffer();
                jumpPageBuffer.append("<select name=\"pages\"");
                jumpPageBuffer.append(" onchange=\"");
                jumpPageBuffer.append(" if(this.options[this.selectedIndex]");
                jumpPageBuffer.append(".value!=''){location='" + url + "?");
                if (isHaveParam) {
                        jumpPageBuffer.append(param + "&");
                }
                jumpPageBuffer.append("page='+this.options[this.selectedIndex]");
                jumpPageBuffer.append(".value;}\">");
                for (int i = 1; i <= totalPage; i++) {
                        jumpPageBuffer.append("<option value=\"" + i + "\"");
                        if (i == page) {
                                jumpPageBuffer.append("selected");
                        }
                        jumpPageBuffer.append(">" + i + "</option>");
                }
                jumpPageBuffer.append("</select>");

                Configuration cfg = new Configuration();
                Template newsTemplate = null;
                StringWriter out = new StringWriter();
                try {
                        cfg.setDirectoryForTemplateLoading(new File(realPath
                                        + pageObject.getPageTemplatePath()));
                        cfg.setObjectWrapper(new DefaultObjectWrapper());

                        /**
                         * 因为本项目所有页面均为UTF-8编码，故此采用UTF-8, 如果页面编码为GBK,此处也需要改成GBK
                         */
                        newsTemplate = cfg.getTemplate(pageTemplate, "UTF-8");

                        /**
                         * 以下主要是进行数据填充,将数据填充到模型中
                         */
                        Map root = new HashMap();
                        root.put("total", String.valueOf(total));
                        root.put("page", String.valueOf(page));
                        root.put("allPage", String.valueOf(totalPage));

                        if (display1) {
                                root.put("firstPageStart", "<a href=\""
                                                + firstPageBuffer.toString() + "\">");
                                root.put("firstPageEnd", "</a>");
                                root.put("firstStyle", "");
                        } else {
                                root.put("firstStyle", imgStyle);
                                root.put("firstPageStart", "");
                                root.put("firstPageEnd", "");
                        }
                        if (display2) {
                                root.put("prevPageStart", "<a href=\""
                                                + perPageBuffer.toString() + "\">");
                                root.put("prevPageEnd", "</a>");
                                root.put("prevStyle", "");
                        } else {
                                root.put("prevStyle", imgStyle);
                                root.put("prevPageStart", "");
                                root.put("prevPageEnd", "");
                        }
                        if (display3) {
                                root.put("nextPageStart", "<a href=\""
                                                + nextPageBuffer.toString() + "\">");
                                root.put("nextPageEnd", "</a>");
                                root.put("nextStyle", "");
                        } else {
                                root.put("nextStyle", imgStyle);
                                root.put("nextPageStart", "");
                                root.put("nextPageEnd", "");
                        }
                        if (display4) {
                                root.put("lastPageStart", "<a href=\""
                                                + lastPageBuffer.toString() + "\">");
                                root.put("lastPageEnd", "</a>");
                                root.put("lastStyle", "");
                        } else {
                                root.put("lastStyle", imgStyle);
                                root.put("lastPageStart", "");
                                root.put("lastPageEnd", "");
                        }
                        if (isPrevPageNumStyle) {
                                root.put("prevPageNumStyle", imgStyle);
                        } else {
                                root.put("prevPageNumStyle", "");
                        }
                        if (isNextPageNumStyle) {
                                root.put("nextPageNumStyle", imgStyle);
                        } else {
                                root.put("nextPageNumStyle", "");
                        }
                        root.put("prevPageNumStart", prevPageNumStart.toString());
                        root.put("prevPageNumEnd", prevPageNumEnd.toString());
                        root.put("nextPageNumStart", nextPageNumStart.toString());
                        root.put("nextPageNumEnd", nextPageNumEnd.toString());
                        root.put("pagePrevPage", pageBarBuffer.toString());
                        root.put("pageBar", pageBarBuffer.toString());
                        root.put("numPage", numPageBuffer.toString());
                        root.put("jumpPage", jumpPageBuffer.toString());
                        try {
                                newsTemplate.process(root, out);
                        } catch (TemplateException e) {
                                e.printStackTrace();
                        }

                } catch (IOException e) {
                        e.printStackTrace();
                }
                return out.toString();
        }

        public int sumPage(int total, int perPage) {
                int totalPage = (total + perPage - 1) / perPage;
                return totalPage;
        }

        public int getCpage(int total, int perPage, int cPage) {
                if (cPage - sumPage(total, perPage) == 1) {
                        cPage--;
                }

                if (cPage - sumPage(total, perPage) > 1 || cPage < 1) {
                        cPage = 1;
                }
                return cPage;
        }
}