hibernate分页实现

1.创建分页实体类

public class PageBean {

private int page; // 页码
private int rows; // 每页显示行数
private int start; // 某一页从第几条开始


public PageBean(int page, int rows) {
super();
this.page = page;
this.rows = rows;
}

public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getRows() {
return rows;
}
public void setRows(int rows) {
this.rows = rows;
}
public int getStart() {
return (page-1)*rows;
}


}

2.daoImpl

public List<Grade> gradeList(PageBean pageBean,Grade grade)throws Exception{
List<Grade> gradeList=null;
Session session=this.getSession();
StringBuffer sb=new StringBuffer("from Grade g");
if(grade!=null && StringUtil.isNotEmpty(grade.getGradeName())){
sb.append(" and g.gradeName like '%"+grade.getGradeName()+"%'");
}
Query query=session.createQuery(sb.toString().replaceFirst("and", "where"));
if(pageBean!=null){
query.setFirstResult(pageBean.getStart());
query.setMaxResults(pageBean.getRows());
}
gradeList=(List<Grade>)query.list();
return gradeList;
}

3.Action

public String execute() throws Exception {
PageBean pageBean=new PageBean(Integer.parseInt(page),Integer.parseInt(rows));
try{
if(grade==null){
grade=new Grade();
}
grade.setGradeName(s_gradeName);
JSONObject result=new JSONObject();
List<Grade> gradeList=gradeService.gradeList(pageBean, grade);
JSONArray jsonArray=new JSONArray();
for(int i=0;i<gradeList.size();i++){
Grade grade=(Grade)gradeList.get(i);
JSONObject jsonObject=new JSONObject();
jsonObject.put("id", grade.getId());
jsonObject.put("gradeName", grade.getGradeName());
jsonObject.put("gradeDesc", grade.getGradeDesc());
jsonArray.add(jsonObject);
}
int total=gradeService.gradeCount(grade);
result.put("rows", jsonArray);
result.put("total", total);
ResponseUtil.write(ServletActionContext.getResponse(), result);
}catch(Exception e){
e.printStackTrace();
}
return null;
}