014 取派员分页查询 - bos

Posted 2020-10-03

一、页面调整

1.修改staff.jsp中的表格的获取datagrid数据的url为staffAction_pageQuery.action

二、封装PageBean工具类

public class PageBean<T> {

private int currentPage;
private int pageSize;
private DetachedCriteria detachedCriteria;
private int total;
private List<T> rows;

public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public DetachedCriteria getDetachedCriteria() {
return detachedCriteria;
}
public void setDetachedCriteria(DetachedCriteria detachedCriteria) {
this.detachedCriteria = detachedCriteria;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public List<T> getRows() {
return rows;
}
public void setRows(List<T> rows) {
this.rows = rows;
}
}

三、服务端实现

1.编写StaffAction.pageQuery

/**
* 分页查询取派员
* @return
*/
public String pageQuery(){

PageBean<Staff> pageBean = new PageBean<Staff>();
pageBean.setCurrentPage(page);
pageBean.setPageSize(rows);
DetachedCriteria dc = DetachedCriteria.forClass(Staff.class);
pageBean.setDetachedCriteria(dc);

staffService.pageQuery(pageBean);

//将pageBean转为json写到页面中
JsonConfig jsonConfig = new JsonConfig();
//设置排除属性
jsonConfig.setExcludes(new String[]{"currentPage", "detachedCriteria", "pageSize"});
String json = JSONObject.fromObject(pageBean, jsonConfig).toString();
System.out.println(json);
ServletActionContext.getResponse().setContentType("text/json;charset=utf-8");
BOSUtils.getWriter().write(json);
return NONE;
}

2.编写StaffService.pageQuery

@Override
public void pageQuery(PageBean<Staff> pageBean) {
staffDao.pageQuery(pageBean);
}

3.在BaseDao抽取通用的分页查询方法，并在BaseDaoImpl中实现

@Override
@SuppressWarnings("unchecked")
public void pageQuery(PageBean<T> pageBean) {

int currentPage = pageBean.getCurrentPage();
int pageSize = pageBean.getPageSize();
DetachedCriteria detachedCriteria = pageBean.getDetachedCriteria();

//指定Hibernate框架发出sql的形式 - 查询记录总数
detachedCriteria.setProjection(Projections.rowCount());
List<Long> countList = (List<Long>) getHibernateTemplate().findByCriteria(detachedCriteria);
Long count = countList.get(0);
pageBean.setTotal(count.intValue());

//清空指定的查询记录数，以进行分页查询
detachedCriteria.setProjection(null);
int firstResult = (currentPage-1)*pageSize;
int maxResults = pageSize;
List<T> rows = (List<T>) getHibernateTemplate().findByCriteria(detachedCriteria,firstResult,maxResults);
pageBean.setRows(rows);
}