使用pager-taglib的jar包实现分页的方法

首先将pager-taglib.jar放到lib目录下

在创建一个Pager类，代码如下：

package org.zttc.itat.model;
import java.util.List;
public class Pager<T> {
private List<T> datas;
private int pageOffset;
private long totalRecord;
private int pageSize;

public List<T> getDatas() {
return datas;
}
public void setDatas(List<T> datas) {
this.datas = datas;
}
public int getPageOffset() {
return pageOffset;
}
public void setPageOffset(int pageOffset) {
this.pageOffset = pageOffset;
}
public long getTotalRecord() {
return totalRecord;
}
public void setTotalRecord(long totalRecord) {
this.totalRecord = totalRecord;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
}

分页中的一些参数需要从页面传过来，我们还需要创建一个SystemContext类，当然这个类要使用ThreadLocal模式，具体代码如下：

package org.zttc.itat.model;
public class SystemContext {
private static ThreadLocal<Integer> pageOffset = new ThreadLocal<Integer>();
private static ThreadLocal<Integer> pageSize = new ThreadLocal<Integer>();

public static int getPageOffset() {
return pageOffset.get();
}
public static void setPageOffset(int _pageOffset) {
pageOffset.set(_pageOffset);
}
public static int getPageSize() {
return pageSize.get();
}
public static void setPageSize(int _pageSize) {
pageSize.set(_pageSize);
}

public static void removePageOffset() {
pageOffset.remove();
}

public static void removePageSize() {
pageSize.remove();
}
}

当然我还需要一个SystemContextFilter过滤器了，代码如下：

package org.zttc.itat.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.zttc.itat.model.SystemContext;

public class SystemContextFilter implements Filter{
private int pageSize = 0;
@Override
public void destroy() {

}
@Override
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
try {
int pageOffset = 0;
try {
pageOffset = Integer.parseInt(req.getParameter("pager.offset"));
} catch (NumberFormatException e) {}
SystemContext.setPageOffset(pageOffset);
SystemContext.setPageSize(pageSize);
chain.doFilter(req, resp);
} finally {
SystemContext.removePageOffset();
SystemContext.removePageSize();
}
}

@Override
public void init(FilterConfig cfg) throws ServletException {
try {
pageSize = Integer.parseInt(cfg.getInitParameter("pageSize"));
} catch (NumberFormatException e) {
pageSize = 10;
}
}
}

web.xml配置一下：

<filter>

<filter-name>SystemContextFilter</filter-name>

<filter-class>org.zttc.itat.filter.SystemContextFilter</filter-class>

<init-param>

<param-name>pageSize</param-name>

<param-value>15</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>SystemContextFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

分页页面pager.jsp显示的代码(其他需要分页的页面可以将其包含进去):

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@taglib prefix="pg" uri="http://jsptags.com/tags/navigation/pager" %>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<pg:pager maxPageItems="15" items="${param.items }" export="curPage=pageNumber" url="${param.url }">

<c:forEach items="${param.params }" var="p">

<pg:param name="${p }"/>

</c:forEach>

<pg:last>

共${items }记录,共${pageNumber }页,

</pg:last>

当前第${curPage }页

<pg:first>

<a href="${pageUrl }">首页</a>

</pg:first>

<pg:prev>

<a href="${pageUrl }">上一页</a>

</pg:prev>

<pg:pages>

<c:if test="${curPage eq pageNumber }">

[${pageNumber }]

</c:if>

<c:if test="${curPage ne pageNumber }">

<a href="${pageUrl }">${pageNumber }</a>

</c:if>

</pg:pages>

<pg:next>

<a href="${pageUrl }">下一页</a>

</pg:next>

<pg:last>

<a href="${pageUrl }">尾页</a>

</pg:last>

</pg:pager>