SpringData JPA实现查询分页demo
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2024-03-06 12:24:25
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.springfram...
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：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。