Java实现分页功能 Java实现简单的分页功能

时间:2021-03-26 LandiYax 人气:0

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不用根据改变SQL的形式去查询;
直接查询所有的数据,根据页码自动显示数据;

分页对象

public class PageUtils implements Serializable {

  /**
   * 
   */
  private static final long serialVersionUID = -5247614532234782640L;
  public final static String PAGE = "page";
  public final static String PAGE_NO = "pageno";
  public final static String PAGE_SIZE = "pagesize";

  private long pageSize=10;//每页显示记录数
  private long firstResult=0;//当页第一条记录号
  private long totalCount;//总记录数
  private long totalPage;//总页码
  private long pageNo=1;//当前页码
  private List<?> sumData;//此集合可用来保存 合计数据
  private List<?> data;//查询结果

  public long getPageSize() {
    return pageSize;
  }
  public void setPageSize(long pageSize) {
    this.pageSize = pageSize;
  }
  public long getFirstResult() {
    if(pageNo>0){
      firstResult=pageSize * (pageNo -1);
    }else{
      firstResult = 0;
    }
    return firstResult;
  }

  public long getNextPageResult(){
    if(pageNo>0){
      return pageSize*(pageNo-1);
    }else{
      return pageNo;
    }
  }

  public void setFirstResult(long firstResult) {
    this.firstResult = firstResult;
  }
  public long getTotalCount() {
    return totalCount;
  }
  public void setTotalCount(long totalCount) {
    this.totalCount = totalCount;
    totalPage = this.totalCount/pageSize;
    if (totalPage == 0 || totalCount % pageSize != 0) {
      totalPage++;
    }
  }
  public long getTotalPage() {
    return totalPage;
  }
  public void setTotalPage(long totalPage) {
    this.totalPage = totalPage;
  }
  public long getPageNo() {
    return pageNo;
  }
  public void setPageNo(long pageNo) {
    this.pageNo = pageNo;
  }

  public List<?> getData() {
    return data;
  }

  public void setData(List<?> data) {
    this.data = data;
  }

  /**
   * 是否第一页
   */
  public boolean isFirstPage() {
    return pageNo <= 1;
  }

  /**
   * 是否最后一页
   */
  public boolean isLastPage() {
    return pageNo >= getTotalPage();
  }

  /**
   * 下一页页码
   */
  public long getNextPage() {
    if (isLastPage()) {
      return pageNo;
    } else {
      return pageNo + 1;
    }
  }

  /**
   * 上一页页码
   */
  public long getPrePage() {
    if (isFirstPage()) {
      return pageNo;
    } else {
      return pageNo - 1;
    }
  }

  public PageUtils(){}

  public PageUtils(long pageNo){
    this.pageNo=pageNo;
  }

  public PageUtils(long pageNo,long pageSize){
    this.pageNo=pageNo;
    this.pageSize = pageSize;
  }

  public List<?> getSumData() {
    return sumData;
  }
  public void setSumData(List<?> sumData) {
    this.sumData = sumData;
  }

}

查询的数据实体

在查询的实体里添加页码和每页显示条数参数;

private int pageSize;  //每页显示的条数
private int pageNo;   //当前页码
public int getPageSize() {
  return pageSize;
}
public void setPageSize(int pageSize) {
  this.pageSize = pageSize;
}

控制层Controller

@RequestMapping("/list")
public String list(Model model,ChannelValueInfoView input) {
    // input:传入的参数为对象

    PageUtils page=new PageUtils();
    //如果传入的当前条数为0,则赋予值(首次查询不带参);
    if(input.getPageSize()==0){
      //当前页码第一页
      input.setPageNo(1);
      //每页显示条数,当前每页显示10条数据;
      input.setPageSize(10);
    }
    page.setPageNo(input.getPageNo());
    page.setPageSize(input.getPageSize());
    //核心分页代码
    PageHelper p=new PageHelper();   
    Page<ChannelValueInfoList> l=p.startPage(input.getPageNo(),input.getPageSize());
    //紧跟着的第一个select查询将会被分页
    channelValueService.getChannelValueInfoViewList(input);
    model.addAttribute("input", input);
    page.setData(l);
    page.setTotalCount(l.getTotal());
    model.addAttribute("page", page);
    return "index";
  }

页面处理

//循环穿过来的PAGE.data数据
<tr th:each="ts : ${page.data}">
<td th:text="${ts.channelValueName}"></td>


----------
<form id="content_form" action="/channelValue/list" method="post" >
  <div>
    总数：<span id="totalCount" th:text="${page.totalCount}">0</span>
  </div>
  <ul class="pagination">
    <li class="disabled">
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="onFirst()">首页</a>
    </li>
    <li class="disabled">
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="onPre()"><</a>
    </li>
    <li class="active">
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
        <span id="beginRow" th:text="${page.pageNo}">0</span>
      </a>
    </li>
    <li class="disabled">
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="onNext()">></a>
    </li>
    <li class="disabled">
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="onLast()">尾页</a>
    </li>
  </ul>
</for  m>


----------

<script>
  function onFirst() {
    onList(1);
  }
  function onPre() {
    var beginRow = parseInt($('#beginRow').html());
    if (beginRow - 1 > 0) {
      onList(beginRow - 1);
    }

  }
  function onNext() {
    var beginRow = parseInt($('#beginRow').html());
    var totalCount = parseInt($('#totalCount').html());
    var pageSize = parseInt($('#pageSize').val());
    if (parseInt(totalCount / pageSize + 1) > beginRow + 1) {
      onList(beginRow+1);
    }
  }
  function onLast() {
    var totalCount = parseInt($('#totalCount').html());
    var pageSize = parseInt($('#pageSize').val());
    onList(parseInt(totalCount / pageSize + 1) - 1);
  }
  function onList(pageNo) {
    if (pageNo == 0)
      pageNo = 1;
    $('#pageNo').val(pageNo);
    $("#content_form").submit();
  }
</script>

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