|
<SPAN style="FONT-SIZE: medium">package com.javacrazyer.web.tag;
import java.io.IOException;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
/**
* 分頁標(biāo)簽處理類
*/
public class PagerTag extends TagSupport {
private static final long serialVersionUID = 5729832874890369508L;
private String url; //請(qǐng)求URI
private int pageSize = 10; //每頁要顯示的記錄數(shù)
private int pageNo = 1; //當(dāng)前頁號(hào)
private int recordCount; //總記錄數(shù)
@SuppressWarnings("unchecked")
public int doStartTag() throws JspException {
int pageCount = (recordCount + pageSize - 1) / pageSize; //計(jì)算總頁數(shù)
//拼寫要輸出到頁面的HTML文本
StringBuilder sb = new StringBuilder();
sb.append("<style type=\"text/css\">");
sb.append(".pagination {padding: 5px;float:right;font-size:12px;}");
sb.append(".pagination a, .pagination a:link, .pagination a:visited {padding:2px 5px;margin:2px;border:1px solid #aaaadd;text-decoration:none;color:#006699;}");
sb.append(".pagination a:hover, .pagination a:active {border: 1px solid #ff0000;color: #000;text-decoration: none;}");
sb.append(".pagination span.current {padding: 2px 5px;margin: 2px;border: 1px solid #ff0000;font-weight: bold;background-color: #ff0000;color: #FFF;}");
sb.append(".pagination span.disabled {padding: 2px 5px;margin: 2px;border: 1px solid #eee; color: #ddd;}");
sb.append("</style>\r\n");
sb.append("<div class=\"pagination\">\r\n");
if(recordCount == 0){
sb.append("<strong>沒有可顯示的項(xiàng)目</strong>\r\n");
}else{
//頁號(hào)越界處理
if(pageNo > pageCount){ pageNo = pageCount; }
if(pageNo < 1){ pageNo = 1; }
sb.append("<form method=\"post\" action=\"").append(this.url)
.append("\" name=\"qPagerForm\">\r\n");
//獲取請(qǐng)求中的所有參數(shù)
HttpServletRequest request = (HttpServletRequest) pageContext
.getRequest();
Enumeration<String> enumeration = request.getParameterNames();
String name = null; //參數(shù)名
String value = null; //參數(shù)值
//把請(qǐng)求中的所有參數(shù)當(dāng)作隱藏表單域
while (enumeration.hasMoreElements()) {
name = enumeration.nextElement();
value = request.getParameter(name);
// 去除頁號(hào)
if (name.equals("pageNo")) {
if (null != value && !"".equals(value)) {
pageNo = Integer.parseInt(value);
}
continue;
}
sb.append("<input type=\"hidden\" name=\"")
.append(name)
.append("\" value=\"")
.append(value)
.append("\"/>\r\n");
}
// 把當(dāng)前頁號(hào)設(shè)置成請(qǐng)求參數(shù)
sb.append("<input type=\"hidden\" name=\"").append("pageNo")
.append("\" value=\"").append(pageNo).append("\"/>\r\n");
// 輸出統(tǒng)計(jì)數(shù)據(jù)
sb.append(" 共<strong>").append(recordCount)
.append("</strong>項(xiàng)")
.append(",<strong>")
.append(pageCount)
.append("</strong>頁: \r\n");
//上一頁處理
if (pageNo == 1) {
sb.append("<span class=\"disabled\">« 上一頁")
.append("</span>\r\n");
} else {
sb.append("<a href=\"javascript:turnOverPage(")
.append((pageNo - 1))
.append(")\">« 上一頁</a>\r\n");
}
//如果前面頁數(shù)過多,顯示"..."
int start = 1;
if(this.pageNo > 4){
start = this.pageNo - 1;
sb.append("<a href=\"javascript:turnOverPage(1)\">1</a>\r\n");
sb.append("<a href=\"javascript:turnOverPage(2)\">2</a>\r\n");
sb.append("…\r\n");
}
//顯示當(dāng)前頁附近的頁
int end = this.pageNo + 1;
if(end > pageCount){
end = pageCount;
}
for(int i = start; i <= end; i++){
if(pageNo == i){ //當(dāng)前頁號(hào)不需要超鏈接
sb.append("<span class=\"current\">")
.append(i)
.append("</span>\r\n");
}else{
sb.append("<a href=\"javascript:turnOverPage(")
.append(i)
.append(")\">")
.append(i)
.append("</a>\r\n");
}
}
//如果后面頁數(shù)過多,顯示"..."
if(end < pageCount - 2){
sb.append("…\r\n");
}
if(end < pageCount - 1){
sb.append("<a href=\"javascript:turnOverPage(")
.append(pageCount - 1)
.append(")\">")
.append(pageCount - 1)
.append("</a>\r\n");
}
if(end < pageCount){
sb.append("<a href=\"javascript:turnOverPage(")
.append(pageCount)
.append(")\">")
.append(pageCount)
.append("</a>\r\n");
}
//下一頁處理
if (pageNo == pageCount) {
sb.append("<span class=\"disabled\">下一頁 »")
.append("</span>\r\n");
} else {
sb.append("<a href=\"javascript:turnOverPage(")
.append((pageNo + 1))
.append(")\">下一頁 »</a>\r\n");
}
sb.append("</form>\r\n");
// 生成提交表單的JS
sb.append("<script language=\"javascript\">\r\n");
sb.append(" function turnOverPage(no){\r\n");
sb.append(" if(no>").append(pageCount).append("){");
sb.append(" no=").append(pageCount).append(";}\r\n");
sb.append(" if(no<1){no=1;}\r\n");
sb.append(" document.qPagerForm.pageNo.value=no;\r\n");
sb.append(" document.qPagerForm.submit();\r\n");
sb.append(" }\r\n");
sb.append("</script>\r\n");
}
sb.append("</div>\r\n");
//把生成的HTML輸出到響應(yīng)中
try {
pageContext.getOut().println(sb.toString());
} catch (IOException e) {
throw new JspException(e);
}
return SKIP_BODY; //本標(biāo)簽主體為空,所以直接跳過主體
}
public void setUrl(String url) {
this.url = url;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public void setPageNo(int pageNo) {
this.pageNo = pageNo;
}
public void setRecordCount(int recordCount) {
this.recordCount = recordCount;
}
}</SPAN> | 
