tld标签分页处理
my-tag.tld
PageBean.java
PageHandler.java
PageTag.java 这里构造的链接是静态化链接，按自己的需求而定
在action中做如下定义：
jsp页面：
css设置：
最后在业务逻辑层：
<?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>
<jsp-version>1.2</jsp-version>
<short-name>mytag</short-name>
<uri>/mytag</uri>
<!-- 继承struts2标签ComponentTagSupport -->
<tag>
<name>page</name>
<tag-class>com.itmg.tools.mytags.PageTag</tag-class>
<attribute>
<name>action</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>index</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>maxIndex</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>size</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>groupSize</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>styleClass</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>theme</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
PageBean.java
package com.itmg.tools.page;
/**
* 分页信息的数据模型
*@author Jason
*/
public class PageBean implements java.io.Serializable{
private static final long serialVersionUID = 1L;
private int offset;//偏离量
private int length;
private int begin;
private int end;
private int total;
private int curPage;
private int totalPage;
private int startPage;
private int endPage;
private int gotoPage;//要到哪一页去
public PageBean() {
}
public int getStartPage() {
return startPage;
}
public void setStartPage(int startPage) {
this.startPage = startPage;
}
public int getEndPage() {
return endPage;
}
public void setEndPage(int endPage) {
this.endPage = endPage;
}
public int getOffset() {
return offset;
}
public void setOffset(int offset) {
this.offset = offset;
}
public int getLength() {
return length;
}
public void setLength(int length) {
this.length = length;
}
public int getBegin() {
return begin;
}
public void setBegin(int begin) {
this.begin = begin;
}
public int getEnd() {
return end;
}
public void setEnd(int end) {
this.end = end;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public int getCurPage() {
return curPage;
}
public void setCurPage(int curPage) {
this.curPage = curPage;
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public int getGotoPage() {
return gotoPage;
}
public void setGotoPage(int gotoPage) {
this.gotoPage = gotoPage;
}
}
PageHandler.java
package com.itmg.tools.page;
import javax.servlet.http.HttpServletRequest;
import com.itmg.util.Constants;
/**
* 分页处理类，处理分页的逻辑
*
* @author Jason
*/
public class PageHandler {
/**
* 得到初始化的分页信息
*
* @param request
* @return
*/
public static PageBean initPage(HttpServletRequest request) {
int length = Constants.PART_PAGE_PER_COUNT;
int offset = 0;
int gotoPageIndex = 1;
int total = 0;
PageBean page = new PageBean();
page.setOffset(offset);
page.setLength(length);
page.setGotoPage(gotoPageIndex);
page.setTotal(total);
return page;
}
/**
* 得到初始化的分页信息
*
* @return
*/
public static PageBean initPage() {
int length = Constants.PART_PAGE_PER_COUNT;
int offset = 0;
int gotoPageIndex = 1;
int total = 0;
PageBean page = new PageBean();
page.setOffset(offset);
page.setLength(length);
page.setGotoPage(gotoPageIndex);
page.setTotal(total);
return page;
}
/**
* 根据传入的PageBean的total，offset，已经请求的动作，等信息 处理出完成此请求动作，正确的分页信息 请求的动作包括
*
* 上一页，下一页，具体某页等
*
*
* 分页信息包括 数据总数，从那条数据开始取数，取多少条等
*
*
* @param page
* @throws Exception
*/
public static PageBean handle(PageBean page) throws Exception {
int offset, curPage, begin, end, total, totalPage, gotoPage, length, startPage, endPage;
offset = page.getOffset();
curPage = page.getCurPage();
begin = page.getBegin();
end = page.getEnd();
total = page.getTotal();
totalPage = page.getTotalPage();
gotoPage = page.getGotoPage();
length = page.getLength();
startPage = page.getStartPage();
endPage = page.getEnd();
if (gotoPage != 1) {
offset = length * (gotoPage - 1);
}
begin = offset + 1;
if (offset + length > total)
end = total;
else
end = offset + length;
curPage = offset / length + 1;
if (total % length == 0) {
totalPage = total / length;
} else {
totalPage = total / length + 1;
}
startPage = curPage - 5;
if (startPage < 1)
startPage = 1;
endPage = startPage + 9;
if (endPage > totalPage)
endPage = totalPage;
if (end == 0)
begin = 0;
page.setOffset(offset);
page.setLength(length);
page.setBegin(begin);
page.setEnd(end);
page.setCurPage(curPage);
page.setEndPage(endPage);
page.setGotoPage(gotoPage);
page.setLength(length);
page.setStartPage(startPage);
page.setTotalPage(totalPage);
page.setTotal(total);
return page;
}
/**
* 从HttpServletRequest 参数中 得到分页请求的值，设置在PageSelect中
*
*
* @param request
* @return
*/
public static PageBean getPageRequest(HttpServletRequest request) {
int length = Constants.PART_PAGE_PER_COUNT;
PageBean page = (PageBean) request.getAttribute(Constants.PART_PAGE_KEY);
if (page == null) {
page = new PageBean();
page.setOffset(0);
page.setLength(length);
page.setGotoPage(1);
}
return page;
}
/**
* 把分页信息 设置在 request 的Attribute中
*
* @param request
* @param page
* 分页信息
* @throws Exception
*/
public static void putPage(HttpServletRequest request, PageBean page) throws Exception {
try {
request.setAttribute(Constants.PART_PAGE_KEY, page);
} catch (Exception e) {
return;
}
}
}
PageTag.java 这里构造的链接是静态化链接，按自己的需求而定
package com.itmg.tools.mytags;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.struts2.ServletActionContext;
public class PageTag extends TagSupport {
private static final long serialVersionUID = -1122449622265941160L;
// action url
private String action;
// 当前页码
private Integer index;
// 最大页码数
private Integer maxIndex;
// 每页最多显示个数
private Integer size;
// 每组显示页码个数
private Integer groupSize;
// css
private String styleClass;
// 模板
private String theme;
@Override
public int doStartTag() throws JspException {
HttpServletRequest request = ServletActionContext.getRequest();
JspWriter out = pageContext.getOut();
String keywords = request.getParameter("keywords");
String category = request.getParameter("category");
String minPrice = request.getParameter("minPrice");
String maxPrice = request.getParameter("maxPrice");
String sort = request.getParameter("sort");
String isAuction = request.getParameter("isAuction");
if(isAuction == null)
isAuction = "0";
try {
if(category != null && !"".equals(category)){
if(minPrice != null || maxPrice != null)
action += keywords+"/category/"+category+"/price/"+minPrice+"-"+maxPrice+"/";
else
action += keywords+"/category/"+category+"/";
}else{
if(minPrice != null || maxPrice != null)
action += keywords+"/price/"+minPrice+"-"+maxPrice+"/";
else
action += keywords+"/";
}
StringBuffer html = new StringBuffer();
String url = null;
// 如果只有一页，则无需分页
if (maxIndex > 1) {
// 数字样式 << prev 1 2 3 4 5 6 7 8 9 10 next >>
html.append("<div ");
if (styleClass != null) {
html.append("class='" + styleClass + "'>");
} else {
html.append(">");
}
if (index > 1) {
// 当前不是第一组，要显示"<< Prev"
// << Prev返回前一页
if((isAuction != null && !"0".equals(isAuction)) || (sort != null && !"0".equals(sort)))
url = action + "/"+sort+"/"+isAuction;
else
url = action;
// html.append("<a href='" + url + "'>先頭ページへ</a> ");
if((isAuction != null && !"0".equals(isAuction)) || (sort != null && !"0".equals(sort)))
url = action + (index - 1) +"/"+sort+"/"+isAuction;
else
if(index>2)
url = action + (index - 1);
else
url = action;
html.append("<a rel=\"nofollow\" href='" + url + "'>前ページへ</a> ");
}
// 从第begin页开始显示到end页,每组有groupSize个页数
int begin, end;
// groupSize不为空,分组显示,否则全部显示
if (groupSize != null && groupSize < maxIndex) {
// 每组显示页码个数的一半
int halfGroupSize = (groupSize - 1) / 2;
begin = (index - (halfGroupSize + 1)) > 0 ? (index - (halfGroupSize + 1)) : 1;
end = (index + halfGroupSize) < maxIndex ? (index + halfGroupSize) : maxIndex;
if (end == maxIndex) {
if (maxIndex - groupSize < 1) {
begin = maxIndex;
}
begin = maxIndex - groupSize;
} else if (begin == 1 && end < maxIndex) {
end = maxIndex > groupSize ? groupSize : maxIndex;
}
} else {
begin = 1;
end = maxIndex;
}
// groupSize个为一组显示
for (int i = begin; i <= end; i++) {
if (index == i) { // 当前页要加粗显示
html.append("<span class=\"current\">" + i + "</span> ");
} else {
if((isAuction != null && !"0".equals(isAuction)) || (sort != null && !"0".equals(sort)))
url = action + i + "/"+sort+"/"+isAuction;
else
if(i==1)
url = action;
else
url = action + i;
html.append("<a rel=\"nofollow\" href='" + url + "'>" + i + "</a> ");
}
}
if (index < maxIndex) {
// >>：返回下一组最后一页
// >：返回下一页
if((isAuction != null && !"0".equals(isAuction)) || (sort != null && !"0".equals(sort)))
url = action + (index + 1) + "/"+sort+"/"+isAuction;
else
url = action + (index + 1);
html.append("<a rel=\"nofollow\" href='" + url + "'>次ページへ</a> ");
if((isAuction != null && !"0".equals(isAuction)) || (sort != null && !"0".equals(sort)))
url = action + maxIndex + "/"+sort+"/"+isAuction;
else
url = action + maxIndex;
// html.append("<a href='" + url + "'>最終ページへ</a>");
}
html.append("</div>");
}
out.write(html.toString());
} catch (IOException e) {
e.printStackTrace();
}
return (SKIP_BODY);
}
public String getAction() {
return action;
}
public void setAction(String action) {
this.action = action;
}
public Integer getIndex() {
return index;
}
public void setIndex(Integer index) {
this.index = index;
}
public Integer getMaxIndex() {
return maxIndex;
}
public void setMaxIndex(Integer maxIndex) {
this.maxIndex = maxIndex;
}
public Integer getSize() {
return size;
}
public void setSize(Integer size) {
this.size = size;
}
public Integer getGroupSize() {
return groupSize;
}
public void setGroupSize(Integer groupSize) {
this.groupSize = groupSize;
}
public String getStyleClass() {
return styleClass;
}
public void setStyleClass(String styleClass) {
this.styleClass = styleClass;
}
public String getTheme() {
return theme;
}
public void setTheme(String theme) {
this.theme = theme;
}
}
在action中做如下定义：
//分页信息
PageBean page = new PageBean();
if (request.getParameter(Constants.PART_PAGE_PAGESEARCH) != null && request.getParameter(Constants.PART_PAGE_PAGESEARCH).equals("true")) {
page = PageHandler.initPage(request);
}
page.setLength(Constants.PART_PAGE_PER_COUNT_10);
if (index != null) {
page.setGotoPage(index);
} else {
page.setGotoPage(1);
}
jsp页面：
<div id="page">
<div class="page_styl">
<mytag:page index="${resultView.page.curPage}" maxIndex="${resultView.page.totalPage}" action="${pageContext.request.contextPath}/word/" size="${resultView.page.length}" styleClass="page_styl" groupSize="12"></mytag:page>
</div>
</div>
css设置：
#page {
margin: 40px auto;
margin-bottom: 25px;
text-align: center;
}
div .page_styl {
text-align: center;
padding-right: 1px;
padding-left: 1px;
padding-bottom: 3px;
margin: 3px;
padding-top: 3px;
text-align: center;
font-size: 14px;
}
div .page_styl a {
border-right: #fff 1px solid;
padding-right: 1px;
border-top: #fff 1px solid;
padding-left: 1px;
padding-bottom: 1px;
margin: 2px;
border-left: #fff 1px solid;
color: #0032ab;
padding-top: 1px;
border-bottom: #fff 1px solid;
text-decoration: underline
}
div .page_styl span.current {
border-right: #fff 1px solid;
padding-right: 1px;
border-top: #fff 1px solid;
padding-left: 1px;
font-weight: bold;
padding-bottom: 1px;
margin: 2px;
border-left: #fff 1px solid;
color: #000;
padding-top: 1px;
border-bottom: #fff 1px solid;
/* background-color: #d5d5d5;*/
}
div .page_styl span.disabled {
border-right: #eee 1px solid;
padding-right: 5px;
border-top: #eee 1px solid;
padding-left: 5px;
padding-bottom: 2px;
margin: 2px;
border-left: #eee 1px solid;
color: #ddd;
padding-top: 2px;
border-bottom: #eee 1px solid
}
最后在业务逻辑层：
page.setTotal(searchResult_temp.size()); page = PageHandler.handle(page);