一、编写Page、PageUtil
public class Page {
// 每页显示记录数
private int pageSize;
// 总记录数
private int totalCount;
// 总页数
private int totalPage;
// 当前页
private int currentPage;
private List items = new LinkedList();
public Page(int pageSize, int totalCount, int totalPage, int currentPage, List items) {
super();
this.pageSize = pageSize;
this.totalCount = totalCount;
this.totalPage = totalPage;
this.currentPage = currentPage;
this.items = items;
}
public List getItems() {
return items;
}
public void setItems(List items) {
this.items = items;
}
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 int getTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
}
PageUtil.java
public class PageUtil {
@SuppressWarnings("unchecked")
public static Page> createPage(int pageSize, int currentPage,int totalCount,List> items) {
pageSize = getPageSize(pageSize);
currentPage = getCurrentPage(currentPage);
int totalPage = getTotalPage(pageSize, totalCount);
return new Page(pageSize,totalCount,totalPage, currentPage,items);
}
// 设置每页显示记录数
public static int getPageSize(int pageSize) {
return pageSize <= 0 ? 10 : pageSize;
}
// 设置当前页
public static int getCurrentPage(int currentPage) {
return currentPage <= 0 ? 1 : currentPage;
}
// 设置总页数,需要总记录数，每页显示多少
public static int getTotalPage(int pageSize, int totalCount) {
int totalPage = 0;
if (totalCount % pageSize == 0) {
totalPage = totalCount / pageSize;
} else {
totalPage = totalCount / pageSize + 1;
}
return totalPage;
}
}
二、编写分页实现
1、BaseDaoImpl增加3个方法(获取总记录数量、获取分页数据、)
@SuppressWarnings({ "unchecked", "hiding" })
public T unique(final String hql, final Object... paramList) {
T countAll = (T) getHibernateTemplate().execute(new HibernateCallback() {
public T doInHibernate(Session session) throws HibernateException, SQLException {
Query query = session.createQuery(hql);
if (paramList != null) {
for (int i = 0; i < paramList.length; i++) {
query.setParameter(i, paramList[i]);
}
}
return (T) query.uniqueResult();
}
});
return countAll;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
public List listPage(final String hql, final int currentPage2, final int pageSize2, final Object... paramlist) {
return getHibernateTemplate().executeFind(new HibernateCallback() {
public List doInHibernate(Session session) throws HibernateException, SQLException {
Query query = (Query) session.createQuery(hql);
if (paramlist != null) {
for (int i = 0; i < paramlist.length; i++) {
query.setParameter(i, paramlist[i]);
}
}
int pageSize = PageUtil.getPageSize(pageSize2);
int currentPage = PageUtil.getCurrentPage(currentPage2);
currentPage = currentPage - 1;
if (currentPage > -1 && pageSize > -1) {
query.setMaxResults(pageSize);
query.setFirstResult(currentPage * pageSize);
}
return query.list();
}
});
}
@SuppressWarnings("unchecked")
public Page getPageData(final String hql, final int currentPage, final int pageSize, final Object... paramlist) {
Page page = null;
String hql2 = "select count(*) " + hql;
Number tempCountAll = this.unique(hql2, paramlist);
int totalCount = tempCountAll.intValue();
List list = this.listPage(hql, currentPage, pageSize, paramlist);
page = (Page) PageUtil.createPage(pageSize, currentPage, totalCount, list);
return page;
}
2、在业务dao类中调用BaseDaoImpl的getPageData
public Page findPageKeyByName(String keyName, int pageSize, int currentPage) {
return getPageData(" from Key where keyName=? ", currentPage, pageSize, keyName);
}
3、在业务service类中增加分页接口
public Page findPageKeyName(String keyName, int pageSize, int currentPage);
4、在业务service实现类中实现分页实现
public Page findPageKeyName(String keyName, int pageSize, int currentPage) {
return userDaoImpl.findPageKeyByName(keyName, pageSize, currentPage);
}
5、测试
public void test6(){
ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
IKeyService keyServiceImpl=(IKeyService) ctx.getBean("keyServiceImpl");
//获取第3页数据，没有10条数据
Page page2=keyServiceImpl.findPageKey(10, 3);
System.out.println(page.getItems().get(0).getKeyName());
System.out.println(page.getItems().get(0).getId());
}