自定义分页标签

摘要: 自定义分页标签

分页实现类，继承TagSupport，doStartTag方法内拼凑分页的html。

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

public class FromPageTag extends TagSupport {

private static final long serialVersionUID = -3662095604913922414L;

private int pageNo;//页码
private int pageSize;//每页数量
private int totalRecord;//总记录数
@Override
public int doStartTag() throws JspException {
int tag = totalRecord % pageSize;
if (tag > 0) {
tag = 1;
}
int endPageNo = totalRecord / pageSize + tag;

StringBuilder sb = new StringBuilder(
"<div class=\"dataTables_wrapper no-footer\"><div class=\"dataTables_paginate paging_simple_numbers\">");
// 前一页
sb.append("<a class=\"paginate_button previous disabled\" ");
if (pageNo > 1) {
sb.append("onclick=\"_turnPage(").append(pageNo - 1).append(")\"");
}
sb.append(">上一页</a>");
// 第一页
sb.append(addPageCell(1));
if (endPageNo > 1) {
sb.append(addPageCell(2));
}
if (endPageNo > 2) {
sb.append(addPageCell(3));
}
if (pageNo > 5) {
sb.append("<span>…</span>");
}
// 中间页码
for (int i = pageNo - 1; i <= pageNo + 1; i++) {
if (i <= 3) {
continue;
}
if (i >= endPageNo - 2) {
continue;
}
sb.append(addPageCell(i));
}

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if (pageNo < endPageNo - 3) {
sb.append("<span>…</span>");
}
//后面页码
if (endPageNo - 2 > 3) {
sb.append(addPageCell(endPageNo - 2));
}
if (endPageNo - 1 > 3) {
sb.append(addPageCell(endPageNo - 1));
}
if(endPageNo > 3) {
sb.append(addPageCell(endPageNo));
}
//最后一页
sb.append("<a class=\"paginate_button next disabled\"");
if(pageNo < endPageNo) {
sb.append("onclick=\"_turnPage(").append(pageNo+1).append(")\"");;
}
sb.append(">下一页</a></div>");
try {
if (sb != null) {
JspWriter out = pageContext.getOut();
out.print(sb);
}
} catch (Exception e) {
throw new JspException("错误");
}
return super.doStartTag();
}

private String addPageCell(int number) {
StringBuilder sb = new StringBuilder();
sb.append("<span><a class=\"paginate_button ");
if (pageNo != number) {
sb.append("\" onclick=\"_turnPage(").append(number).append(")\"");
} else {
sb.append(" current\"");
}
sb.append(">").append(number).append("</a></span>");
return sb.toString();
}

public int getTotalRecord() {
return totalRecord;
}

public void setTotalRecord(int totalRecord) {
this.totalRecord = totalRecord;
}

public int getPageNo() {
return pageNo;
}

public void setPageNo(int pageNo) {
this.pageNo = pageNo;
}

public int getPageSize() {
return pageSize;
}

public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
}

2. 在WEB-INF/tlds内增加 formPage.tld

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version><!-- 标签库的版本 -->
<jsp-version>1.2</jsp-version><!-- 这个标签库要求的JSP规范版本 -->
<short-name>mytag</short-name><!-- JSP页面编写工具可以用来创建助记名的可选名字 -->
<tag>
<name>formPage</name><!-- 唯一标签名 -->
<tag-class>com.common.FromPageTag</tag-class><!--包路径自己定-->
<body-content>empty</body-content><!-- 正文内容类型 -->
<!-- 参数  -->
<attribute>
<name>pageNo</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>pageSize</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>totalRecord</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>

3. web.xml中定义

<jsp-config>
<taglib>
<taglib-uri>/tld/page</taglib-uri>
<taglib-location>/WEB-INF/tlds/formPage.tld</taglib-location>
</taglib>
</jsp-config>

4. 使用

<%@ taglib uri="/tld/page" prefix="myTag" %>

<myTag:formPage pageSize="${pageSize }" pageNo="${pageNo }" totalRecord="${totalRecord }"/>

<script type="text/javascript">
function _turnPage(pageNo) {
document.getElementById("pageNo").value=pageNo;
document.getElementById("pageSize").value=20;
document.getElementById("myForm").submit();
}
</script>