ssh框架搭建实例源码1

package lcz.test.util; import java.io.IOException; import java.util.Enumeration; import javax.servlet.http.HttpServletRequest; import javax.servlet.jsp.JspException; import javax.servlet.jsp.tagext.TagSupport; //标签实现类 public class PageTag extends TagSupport { private static final long serialVersionUID = 1L; private int currentPage = 1;// 当前是第几页 private int totalRows; // 总共有几个记录 private int pageSize = 10; // 每页有几个记录 private String url; // 请求的url地址 public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } public int getTotalRows() { return totalRows; } public void setTotalRows(int totalRows) { this.totalRows = totalRows; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } @Override public int doStartTag() throws JspException { if (totalRows == 0) { return super.doStartTag(); } // 计算总共有几页 int totalPage = (totalRows + pageSize - 1) / pageSize; if (currentPage > totalPage) { currentPage = totalPage; } if (currentPage < 1) { currentPage = 1; } // 转化成字符串形式 StringBuilder sb = new StringBuilder(); // 前台的分页显示，把分页的格式添加到显示的页面上去 // 把当前页隐藏，以便jsp提交的时候，其它地方（本页，他页，后台）可以取到该值 sb.append( "<form name='pageController' id='pageController' action='' method='post'>\r\n") .append("<input type='hidden' id='currentPage' name='currentPage' value='" + currentPage + "' />\r\n"); // 获取当前页 HttpServletRequest request = (HttpServletRequest) pageContext.getRequest(); Enumeration<String> enumeration = request.getParameterNames(); String name = null; String value = null; while (enumeration.hasMoreElements()) { name = enumeration.nextElement(); value = request.getParameter(name); if (name.equals("currentPage")) { if (null != value && !"".equals(value)) { currentPage = Integer.parseInt(value); } continue; } sb.append("<input type='hidden' name='").append(name) .append("' value='").append(value).append("'/>\r\n"); } sb.append("第" + currentPage + "页 \r\n").append(" 共" + totalPage + "页,"); // 逻辑判断显示分页格式 if (currentPage == 1) { sb.append("首页"); sb.append(" "); sb.append("上一页\r\n"); } else { sb.append("<a href='#' onclick='turnOverPage(1)'>首页</a>\r\n"); sb.append(" "); sb.append("<a href='#' onclick='turnOverPage(") .append((currentPage - 1)).append(")'>上一页</a>\r\n"); } sb.append(" "); if (currentPage == totalPage) { sb.append("下一页"); sb.append(" "); sb.append("尾页\r\n"); } else { sb.append("<a href='#' onclick='turnOverPage(") .append((currentPage + 1)).append(")'>下一页</a>\r\n"); sb.append(" "); sb.append("<a href='#' onclick='turnOverPage(").append(totalPage) .append(")'>尾页</a>\r\n"); } sb.append(" 转到<select onChange='turnOverPage(this.value)'>\r\n"); for (int i = 1; i <= totalPage; i++) { if (i == currentPage) { sb.append(" <option value='").append(i) .append("' selected='selected'>第").append(i) .append("页</option>\r\n"); } else { sb.append(" <option value='").append(i).append("'>第") .append(i).append("页</option>\r\n"); } } sb.append("</select>\r\n"); sb.append(" \r\n"); sb.append("</form>\r\n"); // 生成提交表单的JS sb.append("<script language='javascript'>\r\n"); //翻页函数 sb.append(" \t\n"); sb.append(" function turnOverPage(no){\r\n"); sb.append(" var form = document.pageController;\r\n"); //页号越界处理 sb.append(" \r\n"); sb.append(" if(no").append(">").append(totalPage).append(") {\r\n"); sb.append(" no=").append(totalPage).append(";\r\n"); sb.append(" }\r\n"); sb.append(" if(no").append("< 1){\r\n"); sb.append(" no=1;\r\n"); sb.append(" }\r\n"); sb.append(" form.").append("currentPage").append(".value=no;\r\n"); sb.append(" form.action='").append(url).append("';\r\n"); sb.append(" form.submit();\r\n"); sb.append(" }\r\n"); sb.append("</script>\r\n"); try { pageContext.getOut().println(sb.toString()); } catch (IOException e) { e.printStackTrace(); } return super.doStartTag(); } }