基于 JavaEE 的文具销售系统.zip

/* * package www.wenju.utils.com; * * import java.io.IOException; import java.util.Map; import * javax.servlet.http.HttpServletRequest; import javax.servlet.jsp.JspException; * import javax.servlet.jsp.JspWriter; import * javax.servlet.jsp.tagext.TagSupport; * * import org.springframework.beans.factory.annotation.Value; * *//** * 显示格式：首页 上一页 1 2 3 4 5 ... 下一页 尾页 */ /* * public class NavigationTag extends TagSupport { static final long * serialVersionUID = 2372405317744358833L; *//** * request 中用于保存Page<E> 对象的变量名,默认为“page” */ /* * private String bean = "page"; *//** * 分页跳转的url地址,此属性必须 */ /* * private String url = null; *//** * 显示页码数量 */ /* * @Value("${navigationTag.page.maxnumber}") private int number; * * @Override public int doStartTag() throws JspException { JspWriter writer = * pageContext.getOut(); HttpServletRequest request = (HttpServletRequest) * pageContext.getRequest(); Page page = (Page) request.getAttribute(bean); if * (page == null) return SKIP_BODY; url = resolveUrl(url, pageContext); try { // * 计算总页数 int pageCount = page.getTotal() / page.getSize(); if (page.getTotal() % * page.getSize() > 0) { pageCount++; } * writer.print("<nav><ul class=\"pagination\">"); // 首页链接路径 String homeUrl = * append(url, "page", 1); // 末页链接路径 String backUrl = append(url, "page", * pageCount); // 显示“上一页”按钮,当获取页数大于1，则存在首页和前一页的选择，相反则不存在上一页的页面变化 if * (page.getPage() > 1) { String preUrl = append(url, "page", page.getPage() - * 1); preUrl = append(preUrl, "rows", page.getSize()); * writer.print("<li><a href=\"" + homeUrl + "\">" + "首页</a></li>"); * writer.print("<li><a href=\"" + preUrl + "\">" + "上一页</a></li>"); } else { * writer.print("<li class=\"disabled\"><a href=\"#\">" + "首页 </a></li>"); * writer.print("<li class=\"disabled\"><a href=\"#\">" + "上一页 </a></li>"); } // * 显示当前页码的前2页码和后两页码,即当前页为中间页，始终放在中间 // 若1 则 1 2 3 4 5, 若2 则 1 2 3 4 5, 若3 则1 2 3 * 4 5, // 若4 则 2 3 4 5 6 ,若10 则 8 9 10 11 12 int indexPage = 1; // * 获取页数在2或者以下，则不为中间页 if (page.getPage() - 2 <= 0) { indexPage = 1; } else if * (pageCount - page.getPage() <= 2) { indexPage = pageCount - 4; } else { * indexPage = page.getPage() - 2; } for (int i = 1; i <= number && indexPage < * pageCount; indexPage++, i++) { if (indexPage == page.getPage()) { * writer.print("<li class=\"active\"><a href=\"#\">" + indexPage + * "<spanclass=\"sr-only\"></span></a></li>"); continue; } String pageUrl = * append(url, "page", indexPage); pageUrl = append(pageUrl, "rows", * page.getSize()); writer.print("<li><a href=\"" + pageUrl + "\">" + indexPage * + "</a></li>"); } // 显示“下一页”按钮，当获取页数小于总页数，添加url，否则直接展示 if (page.getPage() < * pageCount) { String nextUrl = append(url, "page", page.getPage() + 1); * nextUrl = append(nextUrl, "rows", page.getSize()); * writer.print("<li><a href=\"" + nextUrl + "\">" + "下一页</a></li>"); * writer.print("<li><a href=\"" + backUrl + "\">" + "尾页</a></li>"); } else { * writer.print("<li class=\"disabled\"><a href=\"#\">" + "下一页</a></li>"); * writer.print("<li class=\"disabled\"><a href=\"#\">" + "尾页</a></li>"); } * writer.print("</nav>"); } catch (IOException e) { e.printStackTrace(); } * return SKIP_BODY; } * * private String append(String url, String key, int value) { return append(url, * key, String.valueOf(value)); } * *//** * 为 url 参加 参数对 */ /* * private String append(String url, String key, String value) { if (url == null * || url.trim().length() == 0) { return ""; } if (url.indexOf("?") == -1) { url * = url + "?" + key + "=" + value; } else { if (url.endsWith("?")) { url = url * + key + "=" + value; } else { url = url + "&amp;" + key + "=" + value; } } * return url; } * *//** * 为url 添加翻页请求参数 *//* * private String resolveUrl(String url, javax.servlet.jsp.PageContext * pageContext) throws JspException { Map params = * pageContext.getRequest().getParameterMap(); for (Object key : * params.keySet()) { if ("page".equals(key) || "rows".equals(key)) { continue; * } Object value = params.get(key); if (value == null) { continue; } if * (value.getClass().isArray()) { url = append(url, key.toString(), ((String[]) * value)[0]); } else if (value instanceof String) { url = append(url, * key.toString(), value.toString()); } } return url; } * * public String getBean() { return bean; } * * public void setBean(String bean) { this.bean = bean; } * * public String getUrl() { return url; } * * public void setUrl(String url) { this.url = url; } * * public void setNumber(int number) { this.number = number; } } */ package www.wenju.utils.com; import java.io.IOException; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.TagSupport; import org.springframework.context.annotation.Configuration; /** * 显示格式：首页 上一页 1 2 3 4 5下一页 尾页 */ @Configuration public class NavigationTag extends TagSupport { static final long serialVersionUID = 2372405317744358833L; /** * request 中用于保存Page<E> 对象的变量名,默认为“page” */ private String bean = "page"; /** * 分页跳转的url地址,此属性必须 */ private String url = null; /** * 显示页码数量 */ // @Value("${navigationTag.page.maxnumber}") private int number = 5; /* * 三种情况导致@Value获取不到配置值 1. 变量被关键字static修饰 2. 类没有使用@Component及其衍生标签修饰 3. 在Bean初始化时构造方法中引用被@Value修饰的变量 */ public int doStartTag() throws JspException { JspWriter writer = pageContext.getOut(); HttpServletRequest request = (HttpServletRequest) pageContext.getRequest(); Page page = (Page) request.getAttribute(bean); // number = page.getNumber(); if (page == null) return SKIP_BODY; url = resolveUrl(url, pageContext); try { // 计算总页数 int pageCount = page.getTotal() / page.getSize(); if (page.getTotal() % page.getSize() > 0) { pageCount++; } writer.print("<nav><ul class=\"pagination\">"); // 首页链接路径 String homeUrl = append(url, "page", 1); // 末页链接路径 String backUrl = append(url, "page", pageCount); // 显示“上一页”按钮 if (page.getPage() > 1) { String preUrl = append(url, "page", page.getPage() - 1); preUrl = append(preUrl, "rows", page.getSize()); writer.print("<li><a href=\"" + homeUrl + "\">" + "首页</a></li>"); writer.print("<li><a href=\"" + preUrl + "\">" + "上一页</a></li>"); } else { writer.print("<li class=\"disabled\"><a href=\"#\">" + "首页 </a></li>"); writer.print("<li class=\"disabled\"><a href=\"#\">" + "上一页 </a></li>"); } // 显示当前页码的前2页码和后两页码 // 若1 则 1 2 3 4 5, 若2 则 1 2 3 4 5, 若3 则1 2 3 4 5,若4 则 2 3 4 5 6 ,若10 则 8 9 10 11 12 // int indexPage = 1; int indexPage = (page.getPage() - 2 > 0) ? page.getPage() - 2 : 1; if (page.getPage() - 2 <= 0) { indexPage = 1; } else if (pageCount - page.getPage() <= 2) { indexPage = pageCount - 4; } else { indexPage = page.getPage() - 2; } // 测试 System.out.println("展示页数"+number+"，当前页"+page.getPage()+"，总列数"+page.getTotal()+"，总页数"+pageCount+"，点击页"+indexPage+"，获取点击页"+page.getIndexpage()); for (int i = 1; i <= number && indexPage <= pageCount; indexPage++, i++) { if (indexPage == page.getPage()) { writer.print("<li class=\"active\"><a href=\"#\">" + indexPage + "<spanclass=\"sr-only\"></span></a></li>"); continue; } String pageUrl = append(url, "page", indexPage); pageUrl = append(pageUrl, "rows", page.getSize()); writer.print("<li><a href=\"" + pageUrl + "\">" + indexPage + "</a></li>"); } // 显示“下一页”按钮 if (page.ge