SpringData JPA查询分页demo

2021-09-15 16:40:00

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="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="#" 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="${sourceCode.id}" />" class="list-group-item"><c:out value="${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：

码农公寓

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