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最新推荐文章于 2022-04-14 16:55:00 发布

Evan9603

最新推荐文章于 2022-04-14 16:55:00 发布

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分类专栏： Java 日常

本文链接：https://blog.youkuaiyun.com/Punrain/article/details/80246339

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本文介绍了一种基于Java的分页查询实现方案，包括PageBean类的设计、Action类中的分页逻辑、Servlet中的分页方法实现、DAO层的分页查询逻辑及视图层展示。通过Struts2框架进行页面跳转和数据显示。

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pageBeen:

import java.util.List;

/**
 * 分页封装
 *
 */
public class PageBean<T> {
    
    private int currPage;//当前页数
    
    private int pageSize;//每页显示记录数
    
    private int totalCount;//总记录数
    
    private int totalPage;//总页数
    
    private List<T> list;//每页显示的信息 

    public int getCurrPage() {
        return currPage;
    }

    public void setCurrPage(int currPage) {
        this.currPage = currPage;
    }

    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 List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }

}

Action类的分页方法：

// 分页(当前页)这里等于1是为了使第一页为默认页
    private int currPage = 1;
    public int getCurrPage() {
        return currPage;
    }

    public void setCurrPage(int currPage) {
        this.currPage = currPage;
    }
   /**
     * 分页查询
     */
    public String findAll() {
        PageBean<Employee> pageBean = employeeService.findAll(currPage);
        ActionContext.getContext().getValueStack().push(pageBean);
        return "findAll";
    }

Servlet中的分页方法：

public PageBean<Employee> findAll(int currPage) {
        PageBean<Employee> pageBean = new PageBean<>();
        // 封装pageBean
        pageBean.setCurrPage(currPage);
        int pageSize = 3;
        pageBean.setPageSize(pageSize);
        int totalCount = employeeDao.findCount();
        pageBean.setTotalCount(totalCount);
        Double totalPage = Math.ceil((double) totalCount / pageSize);
        pageBean.setTotalPage(totalPage.intValue());
        int begin = (currPage - 1) * pageSize;
        List<Employee> list = employeeDao.findPage(begin, pageSize);
        pageBean.setList(list);
        return pageBean;
    }

在Dao层编写分页方法：

 public int findCount() {
        String hql="select count(*) from Employee";
        List<Long> list = (List<Long>) hibernateTemplate.find(hql);
        if(list.size()>0){
            return list.get(0).intValue();
        }
        return 0;
    }


    /**
     * 分页信息
     */
    public List<Employee> findPage(int begin, int pageSize) {
        DetachedCriteria criteria=DetachedCriteria.forClass(Employee.class);
        List<Employee> list = (List<Employee>) hibernateTemplate.findByCriteria(criteria, begin, pageSize);
        return list;
    }

视图层：

<table border="0" cellspacing="0" cellpadding="0"  width="900px">
<tr>
<td align="right">
   <span>第<s:property value="currPage"/>/<s:property value="totalPage"/>页</span>&nbsp;&nbsp;
   <span>总记录数:<s:property value="totalCount"/>/每页显示:<s:property value="pageSize"/>条</span>&nbsp;&nbsp;
   <span>
   <s:if test="currPage!=1">
       <a href="department_findAll.action?currPage=1">[首页]</a>&nbsp;&nbsp;
       <a href="department_findAll.action?currPage=<s:property value="currPage-1"/>">[上一页]</a>&nbsp;&nbsp;
   </s:if>  
   <s:if test="currPage!=totalPage">
       <a href="department_findAll.action?currPage=<s:property value="currPage+1"/>">[下一页]</a>&nbsp;&nbsp;
       <a href="department_findAll.action?currPage=<s:property value="totalPage"/>">[尾页]</a>&nbsp;&nbsp;
   </s:if>  
   </span>
</td>
</tr>
</table>

使用Struts2 进行迭代

<s:iterator value="list" var="d">
<tr>
<td align="center"><s:property value="#d.dname"/></td>
<td align="center"><a href="">编辑</a></td>
<td align="center"><a href="">删除</a></td>
</tr>
</s:iterator>