标签处理类:PageTagLib.java
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
public class PageTagLib extends TagSupport {
private JspWriter writeout;
private int crruntPage;
private int pageSize;
private int totalCount;
private String doClick;
/**
* 序列化
*/
private static final long serialVersionUID = 3174234039143531070L;
/**
* @see 如若使用直接定位的 的input name名为crruntPage
*/
@Override
public int doEndTag() throws JspException {
initWriter();
showPageBody();
return EVAL_PAGE;
}
public void showPageBody() {
int PageSize = getPageSize() == 0 ? Constants.PAGESIZE : getPageSize();
setPageSize(PageSize);
StringBuffer out = new StringBuffer();
out = out.append("<tr>");
out = out.append("<td width=‘25%‘ height=‘29‘ nowrap=‘nowrap‘><span>");
out = out.append("共 " + getTotalCount() + " 条纪录，当前第 [ "
+ getCrruntPage() + " / " + getMaxCount()[2] + " ] 页，每页"
+ PageSize + "条纪录");
out = out.append("</span></td>");
out = out.append("<td width=‘75%‘ valign=‘top‘><div align=‘right‘>");
out = out
.append("<table width=‘352‘ height=‘20‘ border=‘0‘ cellpadding=‘0‘ cellspacing=‘0‘>");
out = out.append("<tr>");
int lastPage = getCrruntPage() - 1 <= 0 ? 1 : getCrruntPage() - 1;
int nextPage = getCrruntPage() + 1 > getMaxCount()[2] ? getMaxCount()[2]
: getCrruntPage() + 1;
out = out
.append("<td width=‘62‘ height=‘22‘ valign=‘middle‘><div align=‘right‘><img src=‘images/first.gif‘ onclick =\""
+ getDoClick()
+ "\" href=\"#\" id=1 width=‘37‘ height=‘15‘ /></div></td>");
out = out
.append("<td width=‘50‘ height=‘22‘ valign=‘middle‘><div align=‘right‘><img src=‘images/back.gif‘ onclick =\""
+ getDoClick()
+ "\" href=\"#\" id="
+ lastPage
+ " width=‘43‘ height=‘15‘ /></div></td>");
out = out
.append("<td width=‘54‘ height=‘22‘ valign=‘middle‘><div align=‘right‘><img src=‘images/next.gif‘ onclick =\""
+ getDoClick()
+ "\" href=\"#\" id="
+ nextPage
+ " width=‘43‘ height=‘15‘ /></div></td>");
out = out
.append("<td width=‘49‘ height=‘22‘ valign=‘middle‘><div align=‘right‘><img src=‘images/last.gif‘ onclick =\""
+ getDoClick()
+ "\" href=\"#\" id="
+ getMaxCount()[2]
+ " width=‘37‘ height=‘15‘ /></div></td>");
out = out
.append("<td width=‘59‘ height=‘22‘ valign=‘middle‘><div align=‘right‘>转到第</div></td>");
out = out
.append("<td width=‘25‘ height=‘22‘ valign=‘middle‘><span class=‘STYLE7‘>");
out = out
.append("<input type=\"text\" class=\"pageText\" style=‘height:13px; width:25px;‘ size=‘5‘ onkeyup=\"this.value=this.value.replace(/\\D/g,‘‘);if(this.value > "
+ getMaxCount()[2]
+ "){this.value=‘‘}\" onafterpaste=\"this.value=this.value.replace(/\\D/g,‘‘)\" name =‘crruntPage‘ id =‘crruntPage‘ value="
+ getCrruntPage() + " />");
out = out.append("</span></td>");
out = out.append("<td width=‘23‘ height=‘22‘ valign=‘middle‘>页</td>");
out = out
.append("<td width=‘30‘ height=‘22‘ valign=‘middle‘><img src=‘images/go.gif‘ id=\"button\" onclick =\""
+ getDoClick() + "\" width=‘37‘ height=‘15‘ /></td>");
out = out.append("</tr>");
out = out.append("</table>");
out = out.append("</div></td>");
out = out.append("</tr>");
out = out.append("</table></td>");
out = out
.append("<td width=‘14‘><img src=‘images/tab_22.gif‘ width=‘14‘ height=‘29‘ /></td>");
out = out.append("</tr>");
try {
this.writeout.println(out.toString());
this.writeout.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/** 获取当前页数的和最大页数的算法 * */
public int[] getMaxCount() {
int x = 1, y = 0;
// 总页面数
int totalPage = (getTotalCount() % getPageSize() == 0 ? getTotalCount()
/ getPageSize() : getTotalCount() / getPageSize() + 1);
if (getCrruntPage() < 5 && getCrruntPage() > 0) {
if (totalPage >= 5) {
x = 1;
y = 5;
} else {
x = 1;
y = totalPage;
}
}
if (getCrruntPage() > 2 && (getCrruntPage() + 2) <= totalPage) {
x = getCrruntPage() - 2;
y = getCrruntPage() + 2;
}
if (getCrruntPage() > 4 && (getCrruntPage() + 2) > totalPage) {
x = getCrruntPage() - 3;
y = totalPage;
}
if (getCrruntPage() == totalPage && getCrruntPage() > 4) {
x = getCrruntPage() - 4;
y = totalPage;
}
if (totalPage == 1) {
x = 1;
y = 1;
}
if (totalPage == 0) {
x = 1;
y = 1;
}
int[] out = new int[] { x, y, totalPage };
return out;
}
/** 获取页面中的out的对象 */
public void initWriter() {
try {
this.pageContext.getResponse().flushBuffer();
this.writeout = this.pageContext.getOut();
} catch (Exception e) {
// e.printStackTrace();
}
}
public int getCrruntPage() {
return crruntPage;
}
public void setCrruntPage(int crruntPage) {
this.crruntPage = crruntPage;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public String getDoClick() {
return doClick;
}
public void setDoClick(String doClick) {
this.doClick = doClick;
}
}
配置文件:page.tld
<?xml version="1.0" encoding="utf-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee Web-jsptaglibrary_2_0.xsd"
version="2.0" >
<description>page Tag</description>
<tlib-version>1.0</tlib-version>
<short-name>page_tag</short-name>
<uri>/page_tag</uri>
<tag>
<name>showPageTag</name>
<tag-class>com.immunity.util.PageTagLib</tag-class>
<body-content>empty</body-content>
<attribute><!-- 当前页面 -->
<name>crruntPage</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>pageSize</name> <!-- 页面最大显示数 -->
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>totalCount</name><!-- 总记录数 -->
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>doClick</name><!-- 执行跳转的单击事件, -->
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
web.xml
<jsp-config>
<taglib>
<taglib-uri>/page_tag</taglib-uri>
<taglib-location>/WEB-INF/page.tld</taglib-location>
</taglib>
<jsp-property-group>
<url-pattern>/jsp/*</url-pattern>
<page-encoding>utf-8</page-encoding>
</jsp-property-group>
</jsp-config>
页面使用 jsp文件中
<%@ taglib uri="/page_tag" prefix="page_tag"%>
<!--showPageTag是page.tld中tag标签的name属性-->
<page_tag:showPageTag doClick="doPage(this);" totalCount="${totalCount}" crruntPage="${crruntPage}" />