008-PageBean类模板
2024-03-21 20:56:35
1 PageBean模板一
package ${enclosing_package};
import java.util.ArrayList;
import java.util.List;
public class ${primary_type_name}<T> {
//当前页
private int currentPage;
//当前页显示的条数
private int currentCount;
//总条数
private int totalCount;
//总页数
private int totalPage;
//每页显示的数据
private List<T> productList = new ArrayList<T>();
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getCurrentCount() {
return currentCount;
}
public void setCurrentCount(int currentCount) {
this.currentCount = currentCount;
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public List<T> getProductList() {
return productList;
}
public void setProductList(List<T> productList) {
this.productList = productList;
}
}
2 PageBean模板二
package ${enclosing_package};
import java.util.List;
public class ${primary_type_name} {
//当前页
private Integer currentPage;
//当前页显示的条数
private Integer pageSize;
//总页数
private Integer totalPage;
//总记录数
private Integer totalCount;
//分页列表的数据
private List list ;
public ${primary_type_name}(Integer currentPage, Integer pageSize, Integer totalCount) {
this.currentPage = currentPage;
this.pageSize = pageSize;
this.totalCount = totalCount;
//如果没有指定显示那一页，就显示第一页。
if(this.currentPage==null){
this.currentPage=1;
}
//如果没有指定每页显示几条数据，就默认显示3条。
if(this.pageSize==null){
this.pageSize=3;
}
//计算总页数
this.totalPage = (this.totalCount+this.pageSize-1)/this.pageSize;
//this.totalPage = (int) Math.ceil((this.totalCount*1.0)/this.pageSize);
//判断当前页数是否超出范围
//不能小于1
if(this.currentPage<1){
this.currentPage=1;
}
//不能大于总页数
if(this.currentPage>this.totalPage){
this.currentPage=this.totalPage;
}
}
//计算起始索引
public Integer getStart(){
return (this.currentPage-1)*this.pageSize;
}
public Integer getCurrentPage() {
return currentPage;
}
public void setCurrentPage(Integer currentPage) {
this.currentPage = currentPage;
}
public Integer getPageSize() {
return pageSize;
}
public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}
public Integer getTotalPage() {
return totalPage;
}
public void setTotalPage(Integer totalPage) {
this.totalPage = totalPage;
}
public Integer getTotalCount() {
return totalCount;
}
public void setTotalCount(Integer totalCount) {
this.totalCount = totalCount;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
}
3 PageBean模板三(easyui)
package com.test.bos.utils; import java.util.List; import org.hibernate.criterion.DetachedCriteria;
/**
* 封装分页属性
* @author jepson
*
*/
public class PageBean { private Integer currentPage;//当前页 private Integer pageSize; //当前页显示的条数 private DetachedCriteria detachedCriteria; //查询条件 private Integer total; //总记录数 ，使用easyui的datagrid的分页这是固定的只能是total private List rows; //当前页需要展示的数据集合,使用easyui的datagrid的分页这是固定的只能是rows public Integer getCurrentPage() {
return currentPage;
} public void setCurrentPage(Integer currentPage) {
this.currentPage = currentPage;
} public Integer getPageSize() {
return pageSize;
} public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
} public DetachedCriteria getDetachedCriteria() {
return detachedCriteria;
} public void setDetachedCriteria(DetachedCriteria detachedCriteria) {
this.detachedCriteria = detachedCriteria;
} public Integer getTotal() {
return total;
} public void setTotal(Integer total) {
this.total = total;
} public List getRows() {
return rows;
} public void setRows(List rows) {
this.rows = rows;
}
}
1 针对模板三-通用的分页查询方法
//通用的分页查询方法
@Override
public void pageQuery(PageBean pageBean) {
Integer currentPage = pageBean.getCurrentPage();
Integer pageSize = pageBean.getPageSize();
DetachedCriteria detachedCriteria = pageBean.getDetachedCriteria(); //查询total---总数据量
detachedCriteria.setProjection(Projections.rowCount());
List<Long> countList = (List<Long>) super.getHibernateTemplate().findByCriteria(detachedCriteria);
Long count = 0L;
if(countList!=null&&countList.size()>0){
count = countList.get(0);
}
pageBean.setTotal(count.intValue()); //分页列表的数据
detachedCriteria.setProjection(null); //清空上面设置的聚合查询
int firstResult = (currentPage-1)*pageSize; //分页查询起始页
int maxResults = pageSize; //分页查询每页显示的条数
List list = super.getHibernateTemplate().findByCriteria(detachedCriteria, firstResult, maxResults);
pageBean.setRows(list);
}
4 模板四 -自定义标签实现分页
需要注意：提交方式是get提交，需要解决中文乱码问题
1 commons.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>2.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>common</short-name>
<uri>http://jepson.com/common/</uri>
<display-name>Common Tag</display-name>
<description>Common Tag library</description> <tag>
<name>page</name>
<tag-class>com.test.common.utils.NavigationTag</tag-class>
<body-content>JSP</body-content>
<description>create navigation for paging</description>
<attribute>
<name>bean</name>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>number</name>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>url</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
2.NavigationTag
package com.test.common.utils; import java.io.IOException;
import java.util.Map; import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport; /**
* 显示格式 上一页 1 2 3 4 5 下一页
*/
public class NavigationTag extends TagSupport {
static final long serialVersionUID = 2372405317744358833L; /**
* request 中用于保存Page<E> 对象的变量名,默认为“page”
*/
private String bean = "page"; /**
* 分页跳转的url地址,此属性必须
*/
private String url = null; /**
* 显示页码数量
*/
private int number = 5; @Override
public int doStartTag() throws JspException {
JspWriter writer = pageContext.getOut();
HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
Page page = (Page)request.getAttribute(bean);
if (page == null)
return SKIP_BODY;
url = resolveUrl(url, pageContext);
try {
//计算总页数
int pageCount = page.getTotal() / page.getSize();
if (page.getTotal() % page.getSize() > 0) {
pageCount++;
}
writer.print("<nav><ul class=\"pagination\">");
//显示“上一页”按钮
if (page.getPage() > 1) {
String preUrl = append(url, "page", page.getPage() - 1);
preUrl = append(preUrl, "rows", page.getSize());
writer.print("<li><a href=\"" + preUrl + "\">上一页</a></li>");
} else {
writer.print("<li class=\"disabled\"><a href=\"#\">上一页</a></li>");
}
//显示当前页码的前2页码和后两页码
//若1 则 1 2 3 4 5, 若2 则 1 2 3 4 5, 若3 则1 2 3 4 5,
//若4 则 2 3 4 5 6 ,若10 则 8 9 10 11 12
int indexPage = (page.getPage() - 2 > 0)? page.getPage() - 2 : 1;
for(int i=1; i <= number && indexPage <= pageCount; indexPage++, i++) {
if(indexPage == page.getPage()) {
writer.print( "<li class=\"active\"><a href=\"#\">"+indexPage+"<span class=\"sr-only\">(current)</span></a></li>");
continue;
}
String pageUrl = append(url, "page", indexPage);
pageUrl = append(pageUrl, "rows", page.getSize());
writer.print("<li><a href=\"" + pageUrl + "\">"+ indexPage +"</a></li>");
}
//显示“下一页”按钮
if (page.getPage() < pageCount) {
String nextUrl = append(url, "page", page.getPage() + 1);
nextUrl = append(nextUrl, "rows", page.getSize());
writer.print("<li><a href=\"" + nextUrl + "\">下一页</a></li>");
} else {
writer.print("<li class=\"disabled\"><a href=\"#\">下一页</a></li>");
}
writer.print("</nav>");
} catch (IOException e) {
e.printStackTrace();
}
return SKIP_BODY;
} private String append(String url, String key, int value) { return append(url, key, String.valueOf(value));
} /**
* 为url 参加参数对儿
*
* @param url
* @param key
* @param value
* @return
*/
private String append(String url, String key, String value) {
if (url == null || url.trim().length() == 0) {
return "";
} if (url.indexOf("?") == -1) {
url = url + "?" + key + "=" + value;
} else {
if(url.endsWith("?")) {
url = url + key + "=" + value;
} else {
url = url + "&" + key + "=" + value;
}
} return url;
} /**
* 为url 添加翻页请求参数
*
* @param url
* @param pageContext
* @return
* @throws javax.servlet.jsp.JspException
*/
private String resolveUrl(String url, javax.servlet.jsp.PageContext pageContext) throws JspException{
//UrlSupport.resolveUrl(url, context, pageContext)
Map params = pageContext.getRequest().getParameterMap();
for (Object key:params.keySet()) {
if ("page".equals(key) || "rows".equals(key)) continue;
Object value = params.get(key);
if (value == null) continue;
if (value.getClass().isArray()) {
url = append(url, key.toString(), ((String[])value)[0]);
} else if (value instanceof String) {
url = append(url, key.toString(), value.toString());
}
}
return url;
} /**
* @return the bean
*/
public String getBean() {
return bean;
} /**
* @param bean the bean to set
*/
public void setBean(String bean) {
this.bean = bean;
} /**
* @return the url
*/
public String getUrl() {
return url;
} /**
* @param url the url to set
*/
public void setUrl(String url) {
this.url = url;
} public void setNumber(int number) {
this.number = number;
} }
3.Page
package com.test.common.utils;
import java.util.List;
public class Page<T> {
private int total;
private int page;
private int size;
private List<T> rows;
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
public List<T> getRows() {
return rows;
}
public void setRows(List<T> rows) {
this.rows = rows;
}
}
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