SpringData JPA实现查询分页demo

Z时代
2024-01-10
分类：IT

SpringData JPA 的 PagingAndSortingRepository接口已经提供了对分页的支持，查询的时候我们只需要传入一个 org.springframework.data.domain.Pageable

接口的实现类,指定PageNumber和pageSize即可

springData包中的 PageRequest类已经实现了Pageable接口，我们可以直接使用下边是部分代码：

DAO：


package com.jiaoyiping.jdjy.sourcecode.dao;
import com.jiaoyiping.jdjy.sourcecode.bean.SourceCode;
import org.springframework.data.repository.PagingAndSortingRepository;
/**
 * Created with IntelliJ IDEA.
 * User: 焦一平
 * Date: 14-11-20
 * Time: 下午11:18
 * To change this template use File | Settings | File Templates.
 */
public interface SourceCodeDao extends PagingAndSortingRepository<SourceCode, String> {
}

service：


package com.jiaoyiping.jdjy.sourcecode.service;
import com.jiaoyiping.jdjy.sourcecode.bean.SourceCode;
import com.jiaoyiping.jdjy.sourcecode.dao.SourceCodeDao;
import org.apache.solr.client.solrj.SolrServerException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import javax.transaction.Transactional;
import java.io.IOException;
import java.sql.Timestamp;
import java.util.List;
/**
 * Created with IntelliJ IDEA.
 * User: 焦一平
 * Date: 14-11-20
 * Time: 下午11:24
 * To change this template use File | Settings | File Templates.
 */
public class SourceCodeService {
  @Autowired
  private SourceCodeDao sourceCodeDao;public Page<SourceCode> getSourceCode(int pageNumber,int pageSize){
    PageRequest request = this.buildPageRequest(pageNumber,pageSize);
    Page<SourceCode> sourceCodes= this.sourceCodeDao.findAll(request);
    return sourceCodes;
  }
　　//构建PageRequest
  private PageRequest buildPageRequest(int pageNumber, int pagzSize) {
    return new PageRequest(pageNumber - 1, pagzSize, null);
  }
}

controller：


package com.jiaoyiping.jdjy.sourcecode.controller;
import com.jiaoyiping.jdjy.sourcecode.Const;
import com.jiaoyiping.jdjy.sourcecode.bean.SourceCode;
import com.jiaoyiping.jdjy.sourcecode.service.SourceCodeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * Created with IntelliJ IDEA.
 * User: 焦一平
 * Date: 14-11-20
 * Time: 下午11:22
 * To change this template use File | Settings | File Templates.
 */
@Controller
@RequestMapping(value = "/sourcecode")
public class SourceCodeController {
  @Autowired
  private SourceCodeService sourceCodeService;
  @RequestMapping(value = "list")
  public ModelAndView listSourceCode(HttpServletRequest request, HttpServletResponse response){
    String pageNumberStr=request.getParameter("pageNumber");
    if(pageNumberStr==null ||"".equals(pageNumberStr)){
      pageNumberStr="1";
    }
    int pageNumber = Integer.parseInt(pageNumberStr);
    int pageSize = Const.PAGE_SIZE;
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.setViewName("/sourcecode/listSourceCode");
    Page<SourceCode> sourceCodes = this.sourceCodeService.getSourceCode(pageNumber, pageSize);
    modelAndView.addObject("sourceCodeList",sourceCodes.getContent());
    modelAndView.addObject("totalPageNumber",sourceCodes.getTotalElements());
    modelAndView.addObject("pageSize",pageSize);
    return modelAndView;
  }
}

前端分页：

前端分页组件我们使用bootstrap提供的分页组件：


<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%--
 Created by IntelliJ IDEA.
 User: 焦一平
 Date: 2014/12/27
 Time: 9:57
 To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
 String basePath = request.getContextPath();
 String MethodURL=basePath+"/sourcecode/list.action?pageNumber=";
%>
<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="utf-8"/>
 <title>源代码列表</title>
 <link href="<%=basePath%>/resources/assets/css/bootstrap.min.css" rel="external nofollow" rel="stylesheet"/>
 <script type="text/javascript" src="<%=basePath%>/resources/js/jquery/jquery.js"></script>
 <script type="text/javascript">
  $(document).ready(function(){
   var totalNumber = Number(${totalPageNumber});
   var pageSize = Number(${pageSize});
   var pageCount = totalNumber/pageSize;
   var html = "";
   for(var i = 0;i<pageCount;i++){
    var link_Url = "<li><a href=\"<%=MethodURL%>"+(i+1)+"\">"+(i+1)+"</a></li>";
    html += link_Url;
   }
   var fenyeDiv = document.getElementById("link");
   fenyeDiv.innerHTML=html;
  });
 </script>
</head>
<body>
<a href="#" rel="external nofollow" class="list-group-item active">
 源代码列表
</a>
  <c:forEach items="${sourceCodeList}" var="sourceCode">
   <a href="<%=request.getContextPath()%>/sourcecode/detail.action?id=<c:out value=" rel="external nofollow" ${sourceCode.id}" />" class="list-group-item"><c:out value="${sourceCode.title}" /></a>
  </c:forEach>
<!-- 列表分页的DIV,由JS动态填充内容-->
<ul class="pagination pagination-lg" id="link">
</ul><br>
</body>
</html>