jsp分页技术

1、以下为分页类：

import java.io.Serializable;  
import java.util.List;  
 
import org.apache.commons.lang.builder.ToStringBuilder;  
import org.apache.commons.lang.builder.ToStringStyle;  
 
public class ResultFilter<T> implements Serializable{  
 
    private static final long serialVersionUID = 5472321653620726832L;  
 
    private final static int DEFAULT_NAVIGATOR_SIZE = 5;  
 
    //当前页  
    private int currentPage = 1;  
    //每页显示数量  
    private int pageSize = 5;  
      
    //总条数  
    private int totalCount;  
 
    private boolean havaNextPage;  
 
    private boolean havePrePage;  
 
    private int navigatorSize;  
      
    //存放查询结果用的list  
    private List<T> items;  
      
    public ResultFilter(){  
          
    }  
      
    public ResultFilter(int totalCount, int pageSize, int currentPage) {  
        this(totalCount, pageSize, currentPage, DEFAULT_NAVIGATOR_SIZE);  
    }  
 
    public ResultFilter(int totalCount, int pageSize, int currentPage,  
                        int navigatorSize) {  
        this.totalCount = totalCount;  
        this.pageSize = pageSize;  
        this.currentPage = currentPage;  
        this.navigatorSize = navigatorSize;  
    }  
      
    public int getPageCount() {  
        int pageCount = 0;  
        if (pageSize != 0) {  
            pageCount = totalCount / pageSize;  
            if (totalCount % pageSize != 0)  
                pageCount++;  
        }  
 
        return pageCount;  
    }  
 
    public int getCurrentPage() {  
        currentPage = currentPage < getPageCount() ? currentPage :  
                      getPageCount();  
        currentPage = currentPage < 1 ? 1 : currentPage;  
 
        return currentPage;  
    }  
 
    public int getPageSize() {  
        return pageSize;  
    }  
 
    public int getTotalCount() {  
        return totalCount;  
    }  
 
 
    public boolean isHaveNextPage() {  
        havaNextPage = false;  
        if ((getPageCount() > 1) && (getPageCount() > getCurrentPage()))  
            havaNextPage = true;  
        return havaNextPage;  
    }  
 
    public boolean isHavePrePage() {  
        havePrePage = false;  
        if ((getPageCount() > 1) && (currentPage > 1))  
            havePrePage = true;  
        return havePrePage;  
    }  
 
    private int getNavigatorIndex(boolean isBegin) {  
        int beginNavigatorIndex = getCurrentPage() - navigatorSize / 2;  
        int endNavigatorIndex = getCurrentPage() + navigatorSize / 2;  
        beginNavigatorIndex = beginNavigatorIndex < 1 ? 1 : beginNavigatorIndex;  
        endNavigatorIndex = endNavigatorIndex < getPageCount() ?  
                            endNavigatorIndex :  
                            getPageCount();  
        while ((endNavigatorIndex - beginNavigatorIndex) < navigatorSize &&  
               (beginNavigatorIndex != 1 || endNavigatorIndex != getPageCount())) {  
            if (beginNavigatorIndex > 1)  
                beginNavigatorIndex--;  
            else if (endNavigatorIndex < getPageCount())  
                endNavigatorIndex++;  
        }  
 
        if(isBegin)  
            return beginNavigatorIndex;  
        else  
            return endNavigatorIndex;  
    }  
 
    public int getBeginNavigatorIndex() {  
        return getNavigatorIndex(true);  
    }  
 
    public int getEndNavigatorIndex() {  
        return getNavigatorIndex(false);  
    }  
 
    public List<T> getItems() {  
        return items;  
    }  
 
    public void setItems(List<T> items) {  
        this.items = items;  
    }  
      
    public void setCurrentPage(int currentPage) {  
        this.currentPage = currentPage;  
    }  
 
    public void setPageSize(int pageSize) {  
        this.pageSize = pageSize;  
    }  
 
    public void setTotalCount(int totalCount) {  
        this.totalCount = totalCount;  
    }  
 
    @Override  
    public String toString() {  
        return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);  
    }  
 
}

2、在spring的controller中调用分页类：

@RequestMapping(value="/xxxList")    //xxxList.jsp对应的controller
    public ModelAndView xxxList(@ModelAttribute ResultFilter<xxx> rf){
        systemService.listServiceAll(rf);                                               //调用步骤3 ，分页获取xxx对象
        return new ModelAndView("路径/xxxList", "rf", rf);      //此处跳转到步骤5所表示的网页，并传递分页参数rf，其中“路径/xxxList”

//表示对应的jsp网页，比如myBook/bookList表示myBook目录下的bookList.jsp
    }

3、连操作数据库的service层   获取全部service
    @Transactional(readOnly = false)
    public void listServiceAll(ResultFilter<Services> rf){
        int count=getServiceList().size();
        rf.setTotalCount(count);  
        rf.setItems(serviceDao.getListForPage("from Services", (rf.getCurrentPage() - 1 )* rf.getPageSize(), rf.getPageSize()));

//调用步骤4，分页查询数据库
    }

4、

// -------------- 分页QL Query --------------//
    
    @SuppressWarnings("unchecked")
    public List<T> getListForPage(String hql,int begin,int num){
         Query query = getSession().createQuery(hql);
        
        return query.setFirstResult(begin).setMaxResults(num).list();
        
    }

5、路径/xxxList 对应的jsp网页（注意第四行）

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@ include file="/WEB-INF/views/include/taglib.jsp"%>
<%@ taglib uri="my-taglib" prefix="my"%>               <!--使用了自定义标签，该标签在步骤6中定义-->

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>XXXList</title>
</head>
<body>

<form>    
        <table id="contentTable" >        
        <tbody>
            <c:url value="/xxxDetail" var="url1"></c:url>
            <c:url value="/xxxList" var="url1"></c:url>    <!--该jsp对应的controller-->
            <tr><c:forEach items="${rf.items}" var="xxx">
                <td valign="top" style="width:229px;oveflow:hidden;">

<table>
                       <tr><td ><a name="click to check the detail" href="${url1}?xxxId=${xxx.id}"><img src="${ctxStatic}/images/123.jpg"></img></a></td></tr>
                     <tr><td >${xxx.attribute1}</td></tr>
                     <tr><td >${xxx.attribute2}</td></tr>
                     </table>
                </td>
                </c:forEach>                                
            </tr>        
        </tbody>
    </table>
    <div style="padding-top:30px;"></div>
    <my:paging curr="${rf.currentPage}" total="${rf.pageCount}" size="${rf.pageSize}" href="${url2}"/>      <!--使用了自定义标签-->
    </form>
</body>
</html>

6、自定义标签‘my’

<?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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"  
        version="2.0">  
 
    <description>My Tag Library</description>  
    <tlib-version>1.0</tlib-version>  
    <short-name>my</short-name>  
    <uri>my-taglib</uri>  
 
    <tag>  
        <description>split page</description>  
        <name>paging</name>  
        <tag-class>aaa.bbb.ccc.PagingTag</tag-class>     <!--用到了步骤7中的PagingTag类 ，aaa.bbb.ccc是PagingTag的路径-->
        <body-content>empty</body-content>  
        <attribute>  
            <description>base href</description>  
            <name>href</name>  
            <required>false</required>  
            <rtexprvalue>true</rtexprvalue>  
        </attribute>  
        <attribute>  
            <description>curr page</description>  
            <name>curr</name>  
            <required>true</required>  
            <rtexprvalue>true</rtexprvalue>  
        </attribute>  
        <attribute>  
            <description>page size</description>  
            <name>size</name>  
            <required>true</required>  
            <rtexprvalue>true</rtexprvalue>  
        </attribute>  
        <attribute>  
            <description>total page</description>  
            <name>total</name>  
            <required>true</required>  
            <rtexprvalue>true</rtexprvalue>  
        </attribute>  
        <attribute>  
            <description>curr parameter name</description>  
            <name>cparam</name>  
            <required>false</required>  
            <rtexprvalue>false</rtexprvalue>  
        </attribute>  
        <attribute>  
            <description>page size parameter name</description>  
            <name>sparam</name>  
            <required>false</required>  
            <rtexprvalue>false</rtexprvalue>  
        </attribute>  
        <dynamic-attributes>false</dynamic-attributes>  
    </tag>  
      
      
      
    <tag>  
        <description>front split page</description>  
        <name>frontPaging</name>  
        <tag-class>com.aspire.cms.demo.framework.tag.FrontPagingTag</tag-class>  
        <body-content>empty</body-content>  
        <attribute>  
            <description>base href</description>  
            <name>href</name>  
            <required>false</required>  
            <rtexprvalue>true</rtexprvalue>  
        </attribute>  
        <attribute>  
            <description>result filter</description>  
            <name>rf</name>  
            <required>true</required>  
            <rtexprvalue>true</rtexprvalue>  
        </attribute>  
        <dynamic-attributes>false</dynamic-attributes>  
    </tag>  
 
</taglib>

7、自定义标签类

package aaa.bbb.ccc;

import java.io.IOException;

import javax.servlet.jsp.JspException;  
import javax.servlet.jsp.JspWriter;  
import javax.servlet.jsp.tagext.SimpleTagSupport;  
 
import org.apache.commons.lang.StringUtils;  
 
public class PagingTag extends SimpleTagSupport {  
      
    private String href;  
      
    //当前页  
    private String cparam;  
    //每页条数  
    private String sparam;  
 
    private int curr;//当前页  
      
    private int size;//每页条数  
      
    private int total;//总页数  
      
    @Override  
    public void doTag() throws JspException, IOException {  
        JspWriter out = getJspContext().getOut();  
          
        if(StringUtils.isEmpty(cparam)) {  
            cparam = "currentPage";  
        }  
        if(StringUtils.isEmpty(sparam)) {  
            sparam = "pageSize";  
        }  
          
        if(!href.endsWith("?") && !href.endsWith("&")) {  
            if(href.indexOf("?") == -1) {  
                href = href + "?";  
            } else {  
                href = href + "&";  
            }  
        }  
          
        if (curr <= 0) {  
            curr = 1;  
        } else if (curr > total) {  
            curr = total;  
        }  
          
        out.append("<span>");  
        // 首页  
        if (curr == 1) {  
            out.append("首页");  
        } else {  
            href(out, href, 1, "首页");  
        }  
        out.append(" | ");  
        // 上一页  
        if (curr == 1) {  
            out.append("上一页");  
        } else {  
            href(out, href, curr - 1, "上一页");  
        }  
        out.append(" | ");  
        // 下一页  
        if (curr == total) {  
            out.append("下一页");  
        } else {  
            href(out, href, curr + 1, "下一页");  
        }  
        out.append(" | ");  
        // 末页  
        if (curr == total) {  
            out.append("末页");  
        } else {  
            href(out, href, total, "末页");  
        }  
        out.append("</span>");  
        out.append("<span>第");  
        out.append(curr + "/" + total);  
        out.append("页</span>");  
          
          
        super.doTag();  
    }  
      
    private void href(JspWriter out, String href, int curr, String title) throws IOException {  
        out.append("<a href=\"").append(href).append(cparam).append("=").append("" + curr).append("&").append(sparam).append("=").append("" + size).append("\">").append(title).append("</a>");  
    }  
 
    public int getCurr() {  
        return curr;  
    }  
 
    public void setCurr(int curr) {  
        this.curr = curr;  
    }  
 
    public int getTotal() {  
        return total;  
    }  
 
    public void setTotal(int total) {  
        this.total = total;  
    }  
 
    public String getHref() {  
        return href;  
    }  
 
    public void setHref(String href) {  
        this.href = href;  
    }  
 
    public String getCparam() {  
        return cparam;  
    }  
 
    public void setCparam(String cparam) {  
        this.cparam = cparam;  
    }  
 
    public String getSparam() {  
        return sparam;  
    }  
 
    public void setSparam(String sparam) {  
        this.sparam = sparam;  
    }  
 
    public int getSize() {  
        return size;  
    }  
 
    public void setSize(int size) {  
        this.size = size;  
    }  
 
}