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1、pom.xml
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.2.1.RELEASE
qinfeng.zheng
learn-pagequery
0.0.1-SNAPSHOT
learn-pagequery
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-web
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.3.2
MySQL
mysql-connector-java
5.1.47
runtime
org.springframework.boot
spring-boot-starter-test
test
org.junit.vintage
junit-vintage-engine
com.github.pagehelper
pagehelper-spring-boot-starter
1.2.12
org.springframework.boot
spring-boot-maven-plugin
2. application.peroperties
#pagehelper
pagehelper.helper-dialect=mysql
pagehelper.params=count=countSql
pagehelper.reasonable=true
pagehelper.support-methods-arguments=true
#mysql
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.url= jdbc:mysql://120.79.xx.xx:3306/test?useUnicode=yes&characterEncoding=UTF-8&useSSL=false
spring.datasource.username = root
spring.datasource.password = 1212212
3.实体类
public class Country implements Serializable {
private static final long serialVersionUID = 6569081236403751407L;
private int id;
private String countryname;
private String countrycode;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCountryname() {
return countryname;
}
public void setCountryname(String countryname) {
this.countryname = countryname;
}
public String getCountrycode() {
return countrycode;
}
public void setCountrycode(String countrycode) {
this.countrycode = countrycode;
}
}4，mapper接口类
@Mapper
public interface CountryMapper {
@Select("select * from country")
List findAll();
}5.cotroller类
@RestController
public class CountryController {
@Autowired
private CountryMapper countryMapper;
@GetMapping("/findAll")
public List findAll(@RequestParam(defaultValue = "1") Integer pageNum, @RequestParam(defaultValue = "20") Integer pageSize) {
PageHelper.startPage(pageNum, pageSize);
List countries = countryMapper.findAll();
Page page = (Page) countries;
System.out.println("每页展示条数：" + page.getPageSize());
System.out.println("总条数：" + page.getTotal());
System.out.println("当前页：" + page.getPageNum());
System.out.println("总页数：" + page.getPages());
return countries;
}
}7.测试数据
直接抄官方数据
drop table country if exists;
create table country (
id int primary key auto_increment,
countryname varchar(32),
countrycode varchar(2)
);
insert into country (id, countryname, countrycode) values(1,'Angola','AO');
insert into country (id, countryname, countrycode) values(2,'Afghanistan','AF');
insert into country (id, countryname, countrycode) values(3,'Albania','AL');
insert into country (id, countryname, countrycode) values(4,'Algeria','DZ');
insert into country (id, countryname, countrycode) values(5,'Andorra','AD');
insert into country (id, countryname, countrycode) values(6,'Anguilla','AI');
insert into country (id, countryname, countrycode) values(7,'Antigua and Barbuda','AG');
insert into country (id, countryname, countrycode) values(8,'Argentina','AR');
insert into country (id, countryname, countrycode) values(9,'Armenia','AM');
insert into country (id, countryname, countrycode) values(10,'Australia','AU');
insert into country (id, countryname, countrycode) values(11,'Austria','AT');
insert into country (id, countryname, countrycode) values(12,'Azerbaijan','AZ');
insert into country (id, countryname, countrycode) values(13,'Bahamas','BS');
insert into country (id, countryname, countrycode) values(14,'Bahrain','BH');
insert into country (id, countryname, countrycode) values(15,'Bangladesh','BD');
insert into country (id, countryname, countrycode) values(16,'Barbados','BB');
insert into country (id, countryname, countrycode) values(17,'Belarus','BY');
insert into country (id, countryname, countrycode) values(18,'Belgium','BE');
insert into country (id, countryname, countrycode) values(19,'Belize','BZ');
insert into country (id, countryname, countrycode) values(20,'Benin','BJ');
insert into country (id, countryname, countrycode) values(21,'Bermuda Is.','BM');
insert into country (id, countryname, countrycode) values(22,'Bolivia','BO');
insert into country (id, countryname, countrycode) values(23,'Botswana','BW');
insert into country (id, countryname, countrycode) values(24,'Brazil','BR');
insert into country (id, countryname, countrycode) values(25,'Brunei','BN');
insert into country (id, countryname, countrycode) values(26,'Bulgaria','BG');
insert into country (id, countryname, countrycode) values(27,'Burkina-faso','BF');
insert into country (id, countryname, countrycode) values(28,'Burma','MM');
insert into country (id, countryname, countrycode) values(29,'Burundi','BI');
insert into country (id, countryname, countrycode) values(30,'Cameroon','CM');
insert into country (id, countryname, countrycode) values(31,'Canada','CA');
insert into country (id, countryname, countrycode) values(32,'Central African Republic','CF');
insert into country (id, countryname, countrycode) values(33,'Chad','TD');
insert into country (id, countryname, countrycode) values(34,'Chile','CL');
insert into country (id, countryname, countrycode) values(35,'China','CN');
insert into country (id, countryname, countrycode) values(36,'Colombia','CO');
insert into country (id, countryname, countrycode) values(37,'Congo','CG');
insert into country (id, countryname, countrycode) values(38,'Cook Is.','CK');
insert into country (id, countryname, countrycode) values(39,'Costa Rica','CR');
insert into country (id, countryname, countrycode) values(40,'Cuba','CU');
insert into country (id, countryname, countrycode) values(41,'Cyprus','CY');
insert into country (id, countryname, countrycode) values(42,'Czech Republic','CZ');
insert into country (id, countryname, countrycode) values(43,'Denmark','DK');
insert into country (id, countryname, countrycode) values(44,'Djibouti','DJ');
insert into country (id, countryname, countrycode) values(45,'Dominica Rep.','DO');
insert into country (id, countryname, countrycode) values(46,'Ecuador','EC');
insert into country (id, countryname, countrycode) values(47,'Egypt','EG');
insert into country (id, countryname, countrycode) values(48,'EI Salvador','SV');
insert into country (id, countryname, countrycode) values(49,'Estonia','EE');
insert into country (id, countryname, countrycode) values(50,'Ethiopia','ET');
insert into country (id, countryname, countrycode) values(51,'Fiji','FJ');
insert into country (id, countryname, countrycode) values(52,'Finland','FI');
insert into country (id, countryname, countrycode) values(53,'France','FR');
insert into country (id, countryname, countrycode) values(54,'French Guiana','GF');
insert into country (id, countryname, countrycode) values(55,'Gabon','GA');
insert into country (id, countryname, countrycode) values(56,'Gambia','GM');
insert into country (id, countryname, countrycode) values(57,'Georgia','GE');
insert into country (id, countryname, countrycode) values(58,'Germany','DE');
insert into country (id, countryname, countrycode) values(59,'Ghana','GH');
insert into country (id, countryname, countrycode) values(60,'Gibraltar','GI');
insert into country (id, countryname, countrycode) values(61,'Greece','GR');
insert into country (id, countryname, countrycode) values(62,'Grenada','GD');
insert into country (id, countryname, countrycode) values(63,'Guam','GU');
insert into country (id, countryname, countrycode) values(64,'Guatemala','GT');
insert into country (id, countryname, countrycode) values(65,'Guinea','GN');
insert into country (id, countryname, countrycode) values(66,'Guyana','GY');
insert into country (id, countryname, countrycode) values(67,'Haiti','HT');
insert into country (id, countryname, countrycode) values(68,'Honduras','HN');
insert into country (id, countryname, countrycode) values(69,'Hongkong','HK');
insert into country (id, countryname, countrycode) values(70,'Hungary','HU');
insert into country (id, countryname, countrycode) values(71,'Iceland','IS');
insert into country (id, countryname, countrycode) values(72,'India','IN');
insert into country (id, countryname, countrycode) values(73,'Indonesia','ID');
insert into country (id, countryname, countrycode) values(74,'Iran','IR');
insert into country (id, countryname, countrycode) values(75,'Iraq','IQ');
insert into country (id, countryname, countrycode) values(76,'Ireland','IE');
insert into country (id, countryname, countrycode) values(77,'Israel','IL');
insert into country (id, countryname, countrycode) values(78,'Italy','IT');
insert into country (id, countryname, countrycode) values(79,'Jamaica','JM');
insert into country (id, countryname, countrycode) values(80,'Japan','JP');
insert into country (id, countryname, countrycode) values(81,'Jordan','JO');
insert into country (id, countryname, countrycode) values(82,'Kampuchea (Cambodia )','KH');
insert into country (id, countryname, countrycode) values(83,'Kazakstan','KZ');
insert into country (id, countryname, countrycode) values(84,'Kenya','KE');
insert into country (id, countryname, countrycode) values(85,'Korea','KR');
insert into country (id, countryname, countrycode) values(86,'Kuwait','KW');
insert into country (id, countryname, countrycode) values(87,'Kyrgyzstan','KG');
insert into country (id, countryname, countrycode) values(88,'Laos','LA');
insert into country (id, countryname, countrycode) values(89,'Latvia','LV');
insert into country (id, countryname, countrycode) values(90,'Lebanon','LB');
insert into country (id, countryname, countrycode) values(91,'Lesotho','LS');
insert into country (id, countryname, countrycode) values(92,'Liberia','LR');
insert into country (id, countryname, countrycode) values(93,'Libya','LY');
insert into country (id, countryname, countrycode) values(94,'Liechtenstein','LI');
insert into country (id, countryname, countrycode) values(95,'Lithuania','LT');
insert into country (id, countryname, countrycode) values(96,'Luxembourg','LU');
insert into country (id, countryname, countrycode) values(97,'Macao','MO');
insert into country (id, countryname, countrycode) values(98,'Madagascar','MG');
insert into country (id, countryname, countrycode) values(99,'Malawi','MW');
insert into country (id, countryname, countrycode) values(100,'Malaysia','MY');
insert into country (id, countryname, countrycode) values(101,'Maldives','MV');
insert into country (id, countryname, countrycode) values(102,'Mali','ML');
insert into country (id, countryname, countrycode) values(103,'Malta','MT');
insert into country (id, countryname, countrycode) values(104,'Mauritius','MU');
insert into country (id, countryname, countrycode) values(105,'Mexico','MX');
insert into country (id, countryname, countrycode) values(106,'Moldova, Republic of','MD');
insert into country (id, countryname, countrycode) values(107,'Monaco','MC');
insert into country (id, countryname, countrycode) values(108,'Mongolia','MN');
insert into country (id, countryname, countrycode) values(109,'Montserrat Is','MS');
insert into country (id, countryname, countrycode) values(110,'Morocco','MA');
insert into country (id, countryname, countrycode) values(111,'Mozambique','MZ');
insert into country (id, countryname, countrycode) values(112,'Namibia','NA');
insert into country (id, countryname, countrycode) values(113,'Nauru','NR');
insert into country (id, countryname, countrycode) values(114,'Nepal','NP');
insert into country (id, countryname, countrycode) values(115,'Netherlands','NL');
insert into country (id, countryname, countrycode) values(116,'New Zealand','NZ');
insert into country (id, countryname, countrycode) values(117,'Nicaragua','NI');
insert into country (id, countryname, countrycode) values(118,'Niger','NE');
insert into country (id, countryname, countrycode) values(119,'Nigeria','NG');
insert into country (id, countryname, countrycode) values(120,'North Korea','KP');
insert into country (id, countryname, countrycode) values(121,'Norway','NO');
insert into country (id, countryname, countrycode) values(122,'Oman','OM');
insert into country (id, countryname, countrycode) values(123,'Pakistan','PK');
insert into country (id, countryname, countrycode) values(124,'Panama','PA');
insert into country (id, countryname, countrycode) values(125,'Papua New Cuinea','PG');
insert into country (id, countryname, countrycode) values(126,'Paraguay','PY');
insert into country (id, countryname, countrycode) values(127,'Peru','PE');
insert into country (id, countryname, countrycode) values(128,'Philippines','PH');
insert into country (id, countryname, countrycode) values(129,'Poland','PL');
insert into country (id, countryname, countrycode) values(130,'French Polynesia','PF');
insert into country (id, countryname, countrycode) values(131,'Portugal','PT');
insert into country (id, countryname, countrycode) values(132,'Puerto Rico','PR');
insert into country (id, countryname, countrycode) values(133,'Qatar','QA');
insert into country (id, countryname, countrycode) values(134,'Romania','RO');
insert into country (id, countryname, countrycode) values(135,'Russia','RU');
insert into country (id, countryname, countrycode) values(136,'Saint Lueia','LC');
insert into country (id, countryname, countrycode) values(137,'Saint Vincent','VC');
insert into country (id, countryname, countrycode) values(138,'San Marino','SM');
insert into country (id, countryname, countrycode) values(139,'Sao Tome and Principe','ST');
insert into country (id, countryname, countrycode) values(140,'Saudi Arabia','SA');
insert into country (id, countryname, countrycode) values(141,'Senegal','SN');
insert into country (id, countryname, countrycode) values(142,'Seychelles','SC');
insert into country (id, countryname, countrycode) values(143,'Sierra Leone','SL');
insert into country (id, countryname, countrycode) values(144,'Singapore','SG');
insert into country (id, countryname, countrycode) values(145,'Slovakia','SK');
insert into country (id, countryname, countrycode) values(146,'Slovenia','SI');
insert into country (id, countryname, countrycode) values(147,'Solomon Is','SB');
insert into country (id, countryname, countrycode) values(148,'Somali','SO');
insert into country (id, countryname, countrycode) values(149,'South Africa','ZA');
insert into country (id, countryname, countrycode) values(150,'Spain','ES');
insert into country (id, countryname, countrycode) values(151,'Sri Lanka','LK');
insert into country (id, countryname, countrycode) values(152,'St.Lucia','LC');
insert into country (id, countryname, countrycode) values(153,'St.Vincent','VC');
insert into country (id, countryname, countrycode) values(154,'Sudan','SD');
insert into country (id, countryname, countrycode) values(155,'Suriname','SR');
insert into country (id, countryname, countrycode) values(156,'Swaziland','SZ');
insert into country (id, countryname, countrycode) values(157,'Sweden','SE');
insert into country (id, countryname, countrycode) values(158,'Switzerland','CH');
insert into country (id, countryname, countrycode) values(159,'Syria','SY');
insert into country (id, countryname, countrycode) values(160,'Taiwan','TW');
insert into country (id, countryname, countrycode) values(161,'Tajikstan','TJ');
insert into country (id, countryname, countrycode) values(162,'Tanzania','TZ');
insert into country (id, countryname, countrycode) values(163,'Thailand','TH');
insert into country (id, countryname, countrycode) values(164,'Togo','TG');
insert into country (id, countryname, countrycode) values(165,'Tonga','TO');
insert into country (id, countryname, countrycode) values(166,'Trinidad and Tobago','TT');
insert into country (id, countryname, countrycode) values(167,'Tunisia','TN');
insert into country (id, countryname, countrycode) values(168,'Turkey','TR');
insert into country (id, countryname, countrycode) values(169,'Turkmenistan','TM');
insert into country (id, countryname, countrycode) values(170,'Uganda','UG');
insert into country (id, countryname, countrycode) values(171,'Ukraine','UA');
insert into country (id, countryname, countrycode) values(172,'United Arab Emirates','AE');
insert into country (id, countryname, countrycode) values(173,'United Kiongdom','GB');
insert into country (id, countryname, countrycode) values(174,'United States of America','US');
insert into country (id, countryname, countrycode) values(175,'Uruguay','UY');
insert into country (id, countryname, countrycode) values(176,'Uzbekistan','UZ');
insert into country (id, countryname, countrycode) values(177,'Venezuela','VE');
insert into country (id, countryname, countrycode) values(178,'Vietnam','VN');
insert into country (id, countryname, countrycode) values(179,'Yemen','YE');
insert into country (id, countryname, countrycode) values(180,'Yugoslavia','YU');
insert into country (id, countryname, countrycode) values(181,'Zimbabwe','ZW');
insert into country (id, countryname, countrycode) values(182,'Zaire','ZR');
insert into country (id, countryname, countrycode) values(183,'Zambia','ZM');
好，一切准备就绪，启动springboot项目，浏览器访问，注意controller中打印
第一次请求：
controller打印：
第二次请求：
controller打印：
OK ,验证完毕！完美！！！
补充：
在做分页功能时，前端分页插件一般都需要一些诸如当前页数，总条数，总共多少页之类的数据，这时可以引用PageInfo这个对象，它完全能够满足插件的分页要求。
@GetMapping("/findAll")
public PageInfo findAll(@RequestParam(defaultValue = "1") Integer pageNum, @RequestParam(defaultValue = "20") Integer pageSize) {
PageHelper.startPage(pageNum, pageSize);
List countries = countryMapper.findAll();
// Page page = (Page) countries;
// System.out.println("每页展示条数：" + page.getPageSize());
// System.out.println("总条数：" + page.getTotal());
// System.out.println("当前页：" + page.getPageNum());
// System.out.println("总页数：" + page.getPages());
PageInfo result = new PageInfo<>(countries);
return result;
}请求测试：
查看PageInfo类的源码，不难发现，它对前端分页插件的属性支持还是很全面的
private int pageNum; // 当前页码
private int pageSize; // 每页展示的多少条数据
private int size; // 数据总条数
private int startRow;
private int endRow;
private int pages; // 总共多少页
private int prePage; // 前一页
private int nextPage; // 后一页
private boolean isFirstPage;
private boolean isLastPage;
private boolean hasPreviousPage;
private boolean hasNextPage;
private int navigatePages;
private int[] navigatepageNums;
private int navigateFirstPage;
private int navigateLastPage;
关于“Springboot2中如何集成pagehelper”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识，可以关注创新互联行业资讯频道，小编每天都会为大家更新不同的知识点。
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