SpringData JPA实现查询分页demo

2019-11-26 12:55:28

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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>

最终结果如下：