Jsp+servlet开发的博客系统

package com.scce.sk.entity; import java.util.ArrayList; import java.util.Enumeration; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.PageContext; import javax.servlet.jsp.tagext.BodyContent; import javax.servlet.jsp.tagext.BodyTagSupport; public class SplitPager extends BodyTagSupport { private int pageSize; private List pagelist; private HttpServletRequest request; private int i; private List currentPageList; private String emptyMessage; private int pageFootStyle = 1; private int pageNo = 1; public int doStartTag() throws JspException { try { this.request = ((HttpServletRequest)this.pageContext.getRequest()); JspWriter out = this.pageContext.getOut(); HttpServletRequest request = (HttpServletRequest)this.pageContext.getRequest(); String how = request.getParameter("howPage"); setPageNo(); if (how != null) { setCurrentPageNo(Integer.parseInt(how)); } this.i = 1; this.currentPageList = getCurrentPageList(); this.pageContext.setAttribute("row", this.currentPageList.get(0)); } catch (Exception e) { e.printStackTrace(); } return this.EVAL_BODY_INCLUDE; } public int doAfterBody() throws JspException { try { if (this.pagelist == null) { return 0; } if (this.i < this.currentPageList.size()) { //break label67; this.pageContext.setAttribute("row", this.currentPageList.get(this.i)); this.i += 1; return this.EVAL_BODY_AGAIN; } } catch (Exception e) { e.printStackTrace(); } return 0; } public int doEndTag() throws JspException { try { this.i = 1; JspWriter out = this.pageContext.getOut(); if (this.pagelist == null) { out.print("<center>" + this.emptyMessage + "</center>"); return this.EVAL_PAGE; } // String bodyContent = this.bodyContent.getString(); // out.print(bodyContent); out.println("<table align=\"right\"><tr><td><br/><form id=\"frm_page\" name=\"frm_page\" method=\"post\">"); Enumeration enumeration = this.request.getParameterNames(); while (enumeration.hasMoreElements()) { String name = (String)enumeration.nextElement(); if ((!("howPage".equals(name))) && (!("pageNo".equals(name)))) { String value = new String(this.request.getParameter(name).getBytes("iso-8859-1")); out.println("<input type=\"hidden\" id=\"" + name + "\" name=\"" + name + "\" value=\"" + value + "\">"); } } out.println("<input type=\"hidden\" id=\"howPage\" name=\"howPage\" /><input type=\"hidden\" id=\"pageNo\" name=\"pageNo\" value=\"" + this.pageNo + "\"" + " />"); out.println("<a href=javascript:document.getElementById(\"howPage\").value=1;document.frm_page.submit();>李為</a>"); if (this.pageNo > 1) { out.println("<a href=javascript:document.getElementById(\"howPage\").value=2;document.frm_page.submit();>吮為</a>"); } else if (this.pageFootStyle == 2) { out.println("<a onclick=\"return false\" href=javascript:document.getElementById(\"howPage\").value=2;document.frm_page.submit();>吮為</a>"); } if (this.pageNo < getPageCount()) { out.println("<a href=javascript:document.getElementById(\"howPage\").value=3;document.frm_page.submit();>芟為</a>"); } else if (this.pageFootStyle == 2) { out.println("<a onclick=\"return false\" href=javascript:document.getElementById(\"howPage\").value=3;document.frm_page.submit();>芟為</a>"); } out.println("<a href=javascript:document.getElementById(\"howPage\").value=4;document.frm_page.submit();>人為</a>"); out.println("�<font color=blue>" + this.pageNo + "</font>為/�<font color=blue>" + getPageCount() + "</font>為&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</form></td></tr></table>"); } catch (Exception e) { e.printStackTrace(); } return this.EVAL_PAGE; } public void setPagelist(List pagelist) { this.pagelist = pagelist; } private void setPageNo() { if (this.request.getParameter("pageNo") == null) { this.pageNo = 1; } else { this.pageNo = Integer.parseInt(this.request.getParameter("pageNo").toString()); } } private void setCurrentPageNo(int how) { switch (how) { case 1: this.pageNo = 1; break; case 2: if (this.pageNo <= 1) return; this.pageNo -= 1; break; case 3: if (this.pageNo >= getPageCount()) return; this.pageNo += 1; break; case 4: this.pageNo = getPageCount(); } } private List getCurrentPageList() { int startIndex = (this.pageNo - 1) * this.pageSize; int endIndex = startIndex + this.pageSize; if (endIndex > this.pagelist.size()) { endIndex = this.pagelist.size(); } List saveList = new ArrayList(); for (int i = startIndex; i < endIndex; ++i) { saveList.add(this.pagelist.get(i)); } return saveList; } private int getPageCount() { int size = this.pagelist.size(); return ((size % this.pageSize == 0) ? size / this.pageSize : size / this.pageSize + 1); } public void setEmptyMessage(String emptyMessage) { this.emptyMessage = emptyMessage; } public void setPageFootStyle(int pageFootStyle) { this.pageFootStyle = pageFootStyle; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } }