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6、自定義標簽類(lèi)：

      package com.gps.util;

import java.io.UnsupportedEncodingException;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import com.cari.web.util.HttpParamCaster;
import com.gps.util.Contains;
/**
 * 分頁(yè)標簽處理類(lèi)
 *
 * @author yuanwu
 *
 */
public class PageTag extends TagSupport {

 private long rscount; // 總記錄數

 private int currentpage; // 當前頁(yè)數

 private int pagesize = Contains.PAGE_SIZE; // 每頁(yè)記錄數

 private long pagecount;

 private String action;// 請求

 private String className = Contains.TEXT;

 public int doStartTag() throws JspException {

  String pagetools = pagetool();
  JspWriter out = this.pageContext.getOut();
  try {
   out.write(pagetools);
   out.flush();
  } catch (Exception e) {
   e.printStackTrace();
  }

  return super.doStartTag();
 }

 public String pagetool() {
  StringBuffer str = new StringBuffer();
  String temp = "";
  String url = this.getParamUrl();
  int ProPage = this.currentpage - 1;
  int Nextpage = this.currentpage + 1;
  // 文字的分頁(yè)
  if (className.equals(Contains.TEXT)) {
   str.append("<form method='post' name='pageform' action=''>");
   str
     .append("<table width='100%' border='0' cellspacing='0' cellpadding='0'  style='color: #0099FF'>");
   str.append("<tr>");
   str.append("<td width='3%'> </td>");
   str.append("<td height='26'>");
   str.append("共有記錄" + this.rscount + "條   ");
   str.append("共" + this.pagecount + "頁(yè)   ");
   str.append("每頁(yè)" + this.pagesize + "記錄   ");
   str.append("現在" + this.currentpage + "/" + this.pagecount + "頁(yè)");
   str.append("</td><td>");
   if (this.currentpage > 1) {
    str.append("<a href='" + url + "&currentpage=1'>首頁(yè)</a>");
    str.append("   ");
    str.append("<a href='" + url + "&currentpage=" + ProPage
      + "'>上一頁(yè)</a>");
    str.append("   ");
   } else {
    str.append("首頁(yè)");
    str.append("   ");
    str.append("上一頁(yè)");
    str.append("   ");
   }
   if (this.currentpage < this.pagecount) {
    str.append("<a href='" + url + "&currentpage=" + Nextpage
      + "'>下一頁(yè)</a>");
    str.append("   ");
   } else {
    str.append("下一頁(yè)");
    str.append("   ");
   }
   if (this.pagecount > 1 && this.currentpage != this.pagecount) {
    str.append("<a href='" + url + "&currentpage=" + pagecount
      + "'>尾頁(yè)</a>");
    str.append("   ");
   } else {
    str.append("尾頁(yè)");
    str.append("   ");
   }
   // str.append("轉到");
   // str
   // .append("<select name='currentpage'
   // onchange='javascript:ChangePage(this.value);'>");
   // for (int j = 1; j <= pagecount; j++) {
   // str.append("<option value='" + j + "'");
   // if (currentpage == j) {
   // str.append("selected");
   // }
   // str.append(">");
   // str.append("" + j + "");
   // str.append("</option>");
   // }
   // str.append("</select>頁(yè)");
   // str.append("</td><td width='3%'> </td></tr></table>");
   // str.append("<script language='javascript'>");
   // str.append("function ChangePage(testpage){");
   // str.append("document.pageform.action='" + url
   // + "&currentpage='+testpage+'';");
   // str.append("document.pageform.submit();");
   // str.append("}");
   // str.append("</script>");
   str.append("</form>");
  } else if (className.equals(Contains.IMAGE)) {
   /**
    * 圖片的分頁(yè)
    */

  } else if (className.equals(Contains.BBSTEXT)) {
   /**
    * 論壇形式的分頁(yè)[直接以數字方式體現]
    */
   str
     .append("<table width='100%' border='0' cellspacing='0' cellpadding='0' style='color: #0099FF'>");
   str.append("<tr>");
   str.append("<td width='3%'> </td>");
   str.append("<td height='26'>");
   str.append("記錄" + this.rscount + "條  ");
   str.append("共" + this.pagecount + "頁(yè)  ");
   str.append("每頁(yè)" + this.pagesize + "記錄  ");
   str.append("現在" + this.currentpage + "/" + this.pagecount + " 頁(yè)");
   str.append("</td><td>");
   // 設定是否有首頁(yè)的鏈接
   if (this.currentpage > 1) {
    str.append("<a href='" + url + "&currentpage=1'>首頁(yè)</a>");
    str.append("  ");
   }
   // 設定是否有上一頁(yè)的鏈接
   if (this.currentpage > 1) {
    str.append("<a href='" + url + "&currentpage=" + ProPage
      + "'>上一頁(yè)</a>");
    str.append("   ");
   }
   // 如果總頁(yè)數只有10的話(huà)
   if (this.pagecount <= 10) {
    for (int i = 1; i <= this.pagecount; i++) {
     if (this.currentpage == i) {
      str.append("<font color=red>[" + i
        + "]</font>  ");
     } else {
      str.append("<a href='" + url + "&currentpage=" + i
        + "'>" + i + "</a>  ");
     }
    }
   } else {
    // 說(shuō)明總數有超過(guò)10頁(yè)
    // 制定特環(huán)的開(kāi)始頁(yè)和結束頁(yè)

    long endPage = this.currentpage + 2;
    if (endPage > this.pagecount) {
     endPage = this.pagecount;
    }
    int startPage = 0;
    if (this.pagecount >= 8 && this.currentpage >= 8) {
     startPage = this.currentpage - 2;
    } else {
     // 表示從第一頁(yè)開(kāi)始算
     startPage = 1;
    }
    // System.out.println(startPage);
    // System.out.println(endPage);
    for (int i = startPage; i <= endPage; i++) {
     if (this.currentpage == i) {
      str.append("<font color=red>[" + i
        + "]</font>  ");
     } else {
      str.append("<a href='" + url + "&currentpage=" + i
        + "'>" + i + "</a>  ");
     }
    }
   }
   // 設定是否有下一頁(yè)的鏈接
   if (this.currentpage < this.pagecount) {
    str.append("<a href='" + url + "&currentpage=" + Nextpage
      + "'>下一頁(yè)</a>");
    str.append("  ");
   }
   // 設定是否有尾頁(yè)的鏈接
   if (this.pagecount > 1 && this.currentpage != this.pagecount) {
    str.append("<a href='" + url + "&currentpage=" + pagecount
      + "'>尾頁(yè)</a>");
    str.append("  ");
   }
   str.append("轉到  ");
   str
     .append("<select name='currentpage' onchange='javascript:ChangePage(this.value);' size='0.5'>");
   for (int j = 1; j <= pagecount; j++) {
    str.append("<option value='" + j + "'");
    if (currentpage == j) {
     str.append("selected");
    }
    str.append(">");
    str.append("" + j + "");
    str.append("</option>");
   }
   str.append("</select>頁(yè)");
   str.append("</td><td width='3%'> </td></tr></table>");
   str.append("<script language='javascript'>");
   str.append("function ChangePage(testpage){");
   str.append("window.location.href='" + url
     + "&currentpage='+ testpage;");
   str.append("}");
   str.append("</script>");
   str.append("</td><td width='3%'> </td></tr></table>");

  } else if (className.equals(Contains.BBSIMAGE)) {
   /**
    * 論壇形式的分頁(yè)[以圖片的方式體現]
    */
   // 設定分頁(yè)顯示的CSS
   str.append("<style>");
   str
     .append("BODY {FONT-SIZE: 12px;FONT-FAMILY:宋體;WIDTH: 60%; PADDING-LEFT: 25px;}");
   str
     .append("DIV.meneame {PADDING-RIGHT: 3px; PADDING-LEFT: 3px; FONT-SIZE: 80%; PADDING-BOTTOM: 3px; MARGIN: 3px; COLOR: #ff6500; PADDING-TOP: 3px; TEXT-ALIGN: center}");
   str
     .append("DIV.meneame A {BORDER-RIGHT: #ff9600 1px solid; PADDING-RIGHT: 7px; BACKGROUND-POSITION: 50% bottom; BORDER-TOP: #ff9600 1px solid; PADDING-LEFT: 7px; BACKGROUND-IMAGE: url('"
       + ((HttpServletRequest) this.pageContext
         .getRequest()).getContextPath()
       + "/meneame.jpg'); PADDING-BOTTOM: 5px; BORDER-LEFT: #ff9600 1px solid; COLOR: #ff6500; MARGIN-RIGHT: 3px; PADDING-TOP: 5px; BORDER-BOTTOM: #ff9600 1px solid; TEXT-DECORATION: none}");
   str
     .append("DIV.meneame A:hover {BORDER-RIGHT: #ff9600 1px solid; BORDER-TOP: #ff9600 1px solid; BACKGROUND-IMAGE: none; BORDER-LEFT: #ff9600 1px solid; COLOR: #ff6500; BORDER-BOTTOM: #ff9600 1px solid; BACKGROUND-COLOR: #ffc794}");
   str
     .append("DIV.meneame SPAN.current {BORDER-RIGHT: #ff6500 1px solid; PADDING-RIGHT: 7px; BORDER-TOP: #ff6500 1px solid; PADDING-LEFT: 7px; FONT-WEIGHT: bold; PADDING-BOTTOM: 5px; BORDER-LEFT: #ff6500 1px solid; COLOR: #ff6500; MARGIN-RIGHT: 3px; PADDING-TOP: 5px; BORDER-BOTTOM: #ff6500 1px solid; BACKGROUND-COLOR: #ffbe94}");
   str
     .append("DIV.meneame SPAN.disabled {BORDER-RIGHT: #ffe3c6 1px solid; PADDING-RIGHT: 7px; BORDER-TOP: #ffe3c6 1px solid; PADDING-LEFT: 7px; PADDING-BOTTOM: 5px; BORDER-LEFT: #ffe3c6 1px solid; COLOR: #ffe3c6; MARGIN-RIGHT: 3px; PADDING-TOP: 5px; BORDER-BOTTOM: #ffe3c6 1px solid}");
   str.append("</style>");
   str.append("<div class=\"meneame\">");
   // 判定是否有上一頁(yè)
   if (this.currentpage > 1) {
    str.append("<a href='" + url
      + "&currentpage=1' hidefocus=\"true\">首頁(yè)</a>");
    str.append("   ");
    str.append("<a href='" + url + "&currentpage=" + ProPage
      + "' hidefocus=\"true\">上一頁(yè)</a>");
    str.append("   ");
   } else {
    str.append("<span class=\"disabled\">首頁(yè)</span>");
    str.append("  ");
    str.append("<span class=\"disabled\">上一頁(yè)</span>");
    str.append("  ");
   }
   // 顯示中間的圖片
   if (this.pagecount <= 10) {
    for (int i = 1; i <= this.pagecount; i++) {
     if (this.currentpage == i) {
      str.append("<span class=\"current\">" + i + "</span>");
     } else {
      str.append("<a href='" + url + "&currentpage=" + i
        + "' hidefocus=\"true\">" + i
        + "</a>  ");
     }
    }
   } else {
    // 說(shuō)明總數有超過(guò)10頁(yè)
    // 制定特環(huán)的開(kāi)始頁(yè)和結束頁(yè)
    long endPage = this.currentpage + 4;
    if (endPage > this.pagecount) {
     endPage = this.pagecount;
    }
    int startPage = 0;
    if (this.pagecount >= 8 && this.currentpage >= 8) {
     startPage = this.currentpage - 5;
    } else {
     // 表示從第一頁(yè)開(kāi)始算
     startPage = 1;
    }
    System.out.println(startPage);
    System.out.println(endPage);
    for (int i = startPage; i <= endPage; i++) {
     if (this.currentpage == i) {
      str.append("<span class=\"current\">" + i + "</span>");
     } else {
      str.append("<a href='" + url + "&currentpage=" + i
        + "' hidefocus=\"true\">" + i
        + "</a>  ");
     }
    }
   }

   // 判斷下一頁(yè)和尾頁(yè)
   if (this.currentpage < this.pagecount) {
    if (this.currentpage < this.pagecount - 10) {
     str.append("...");
     str.append("<a href='" + url + "&currentpage="
       + (this.pagecount - 1) + "' hidefocus=\"true\">"
       + (this.pagecount - 1) + "</a>  ");
     str.append("<a href='" + url + "&currentpage="
       + this.pagecount + "' hidefocus=\"true\">"
       + this.pagecount + "</a>  ");
    }

    str.append("<a href='" + url + "&currentpage=" + Nextpage
      + "' hidefocus=\"true\">下一頁(yè)</a>");
    str.append("  ");
   } else {
    str.append("<span class=\"disabled\">下一頁(yè)</span>");
    str.append("  ");
   }
   if (this.pagecount > 1 && this.currentpage != this.pagecount) {
    str.append("<a href='" + url + "&currentpage=" + pagecount
      + "' hidefocus=\"true\">尾頁(yè)</a>");
    str.append("  ");
   } else {
    str.append("<span class=\"disabled\">尾頁(yè)</span>");
    str.append("  ");
   }
   str.append("</div>");
  }
  return str.toString();
 }

 private String getParamUrl() {
        
  String url = "";
  HttpServletRequest request = (HttpServletRequest) this.pageContext
    .getRequest();
  url = request.getContextPath() + action;
  if (url.indexOf("?") == -1) {
   url = url + "?";
  }
  String totalParams = "";
  Enumeration params = request.getParameterNames(); // 獲取所有參數名
  while (params.hasMoreElements()) {
   String tempName = params.nextElement().toString();
//   String tempValue = request.getParameter(tempName);
//   try {
//    tempValue=new String(tempValue.getBytes(),"UTF-8");
//   } catch (UnsupportedEncodingException e) {
//    // TODO Auto-generated catch block
//    e.printStackTrace();
//   }
   String tempValue=HttpParamCaster.getUTF8Parameter(request, tempName);
   try {
    if(tempValue!=null && !"".equals(tempValue))
     tempValue=java.net.URLEncoder.encode(tempValue,"UTF-8");
   } catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   if (tempValue != null && !tempValue.equals("")
     && !tempName.equals("currentpage")) {
    if (totalParams.equals("")) {

     totalParams = totalParams + tempName + "=" + tempValue;
    } else {
     totalParams = totalParams + "&" + tempName + "="
       + tempValue;
    }
   }
  }
  String totalUtl = url + totalParams;
  return totalUtl;
 }

 public String getAction() {
  return action;
 }

 public void setAction(String action) {
  this.action = action;
 }

 public int getCurrentpage() {
  return currentpage;
 }

 public void setCurrentpage(int currentpage) {
  this.currentpage = currentpage;
 }

 public long getPagecount() {
  return pagecount;
 }

 public void setPagecount(long pagecount) {
  this.pagecount = pagecount;
 }

 public int getPagesize() {
  return pagesize;
 }

 public void setPagesize(int pagesize) {
  this.pagesize = pagesize;
 }

 public long getRscount() {
  return rscount;
 }

 public void setRscount(long rscount) {
  this.rscount = rscount;
  try {
   this.pagecount = ((this.rscount - 1) / this.pagesize) + 1;
  } catch (Exception ex) {
   this.pagecount = 0; 
  }
 }

 public String getClassName() {
  return className;
 }

 public void setClassName(String className) {
  this.className = className;
 }

}