SpringBoot与PageHelper的整合示例详解
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SpringBoot与PageHelper的整合示例详解
1.PageHelper简介
PageHelper官网地址:
摘要: com.github.pagehelper.PageHelper是一款好用的开源免费的Mybatis第三方物理分页插件。
PageHelper是一款好用的开源免费的Mybatis第三方物理分页插件，其实我并不想加上好用两个字，但是为了表扬插件作者开源免费的崇高精神，我毫不犹豫的加上了好用一词作为赞美。
原本以为分页插件，应该是很简单的，然而PageHelper比我想象的要复杂许多，它做的很强大，也很彻底，强大到使用者可能并不需要这么多功能，彻底到一参可以两用。但是，我认为，作为分页插件，完成物理分页任务是根本，其它的很多智能并不是必要的，保持它够傻够憨，专业术语叫stupid，简单就是美。
我们将简单介绍PageHelper的基本使用和配置参数的含义，重点分析PageHelper作为Mybatis分页插件的实现原理。
2.SpringBoot与PageHelper的整合示例
结构图如下:
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.home</groupId>
<artifactId>springbootdemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springbootdemo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--mybatis与mysql-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.2.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!--druid依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.25</version>
</dependency>
<!--redis依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<!--pageHelper-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- 热部署模块 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional> <!-- 这个需要为 true 热部署才有效 -->
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
</project>
OrderPresentController:
package com.home.orderpresentdemo.controller;
import com.github.pagehelper.PageInfo;
import com.home.orderpresentdemo.entity.OrderPresentInfo;
import com.home.orderpresentdemo.service.OrderPresentInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.HashMap;
import java.util.List;
@Controller
@RequestMapping("/")
public class OrderPresentController
@Autowired
private OrderPresentInfoService orderPresentService;
/**
* 跳转到应用列表页面
* @param pageNo 要显示第几页内容
* @param pageSize 一页显示多少条
* @return
*/
@RequestMapping("/list")
@ResponseBody
public PageInfo<OrderPresentInfo> list(@RequestParam(value="pageNo",defaultValue="1")int pageNo, @RequestParam(value="pageSize",defaultValue="10")int pageSize)
PageInfo<OrderPresentInfo> page = orderPresentService.getAllOrderPresentForPage(pageNo,pageSize);
return page;
@RequestMapping("/")
public String hellohtml(HashMap<String, Object> map, Model model)
model.addAttribute("say","欢迎欢迎,热烈欢迎");
map.put("hello", "欢迎进入HTML页面");
return "index";
@RequestMapping("/goToAdd")
public String goToAdd()
return "add";
@RequestMapping("/add")
public String add(OrderPresentInfo orderPresent)
return "添加成功";
OrderPresentInfoService:
package com.home.orderpresentdemo.service;
import com.github.pagehelper.PageInfo;
import com.home.orderpresentdemo.entity.OrderPresentInfo;
import java.util.List;
public interface OrderPresentInfoService
List<OrderPresentInfo> getAllOrderPresent();
PageInfo<OrderPresentInfo> getAllOrderPresentForPage(int pageNo, int pageSize);
OrderPresentInfoServiceImpl:
package com.home.orderpresentdemo.service.impl;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.home.orderpresentdemo.entity.OrderPresentInfo;
import com.home.orderpresentdemo.mapper.OrderPresentInfoMapper;
import com.home.orderpresentdemo.service.OrderPresentInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class OrderPresentInfoServiceImpl implements OrderPresentInfoService
@Autowired
private OrderPresentInfoMapper orderPresentMapper;
@Override
public List<OrderPresentInfo> getAllOrderPresent()
return orderPresentMapper.getAllOrderPresent();
@Override
public PageInfo<OrderPresentInfo> getAllOrderPresentForPage(int pageNo, int pageSize)
PageHelper.startPage(pageNo,pageSize);
List<OrderPresentInfo> allOrderPresentList = orderPresentMapper.getAllOrderPresent();
PageInfo<OrderPresentInfo> pageInfo = new PageInfo<>(allOrderPresentList);
return pageInfo;
OrderPresentInfo:
package com.home.orderpresentdemo.entity;
import java.math.BigDecimal;
import java.util.Date;
public class OrderPresentInfo
private Long id;
private String activityName;
private Date beginTime;
private Date endTime;
private Integer activityStoresSelectType;
private String activityStoresIds;
private Integer memberLevelSelectType;
private String memberLevelIds;
private BigDecimal activityOrderConsume;
private String paymentChannelIds;
private Integer equityType;
private Long couponId;
private Long luckyTurningId;
private Integer activityStatus;
private Date createTime;
private Date updateTime;
public Long getId()
return id;
public void setId(Long id)
this.id = id;
public String getActivityName()
return activityName;
public void setActivityName(String activityName)
this.activityName = activityName == null ? null : activityName.trim();
public Date getBeginTime()
return beginTime;
public void setBeginTime(Date beginTime)
this.beginTime = beginTime;
public Date getEndTime()
return endTime;
public void setEndTime(Date endTime)
this.endTime = endTime;
public Integer getActivityStoresSelectType()
return activityStoresSelectType;
public void setActivityStoresSelectType(Integer activityStoresSelectType)
this.activityStoresSelectType = activityStoresSelectType;
public String getActivityStoresIds()
return activityStoresIds;
public void setActivityStoresIds(String activityStoresIds)
this.activityStoresIds = activityStoresIds == null ? null : activityStoresIds.trim();
public Integer getMemberLevelSelectType()
return memberLevelSelectType;
public void setMemberLevelSelectType(Integer memberLevelSelectType)
this.memberLevelSelectType = memberLevelSelectType;
public String getMemberLevelIds()
return memberLevelIds;
public void setMemberLevelIds(String memberLevelIds)
this.memberLevelIds = memberLevelIds == null ? null : memberLevelIds.trim();
public BigDecimal getActivityOrderConsume()
return activityOrderConsume;
public void setActivityOrderConsume(BigDecimal activityOrderConsume)
this.activityOrderConsume = activityOrderConsume;
public String getPaymentChannelIds()
return paymentChannelIds;
public void setPaymentChannelIds(String paymentChannelIds)
this.paymentChannelIds = paymentChannelIds == null ? null : paymentChannelIds.trim();
public Integer getEquityType()
return equityType;
public void setEquityType(Integer equityType)
this.equityType = equityType;
public Long getCouponId()
return couponId;
public void setCouponId(Long couponId)
this.couponId = couponId;
public Long getLuckyTurningId()
return luckyTurningId;
public void setLuckyTurningId(Long luckyTurningId)
this.luckyTurningId = luckyTurningId;
public Integer getActivityStatus()
return activityStatus;
public void setActivityStatus(Integer activityStatus)
this.activityStatus = activityStatus;
public Date getCreateTime()
return createTime;
public void setCreateTime(Date createTime)
this.createTime = createTime;
public Date getUpdateTime()
return updateTime;
public void setUpdateTime(Date updateTime)
this.updateTime = updateTime;
OrderPresentInfoMapper:
package com.home.orderpresentdemo.mapper;
import com.home.orderpresentdemo.entity.OrderPresentInfo;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface OrderPresentInfoMapper
int deleteByPrimaryKey(Long id);
int insert(OrderPresentInfo record);
int insertSelective(OrderPresentInfo record);
OrderPresentInfo selectByPrimaryKey(Long id);
int updateByPrimaryKeySelective(OrderPresentInfo record);
int updateByPrimaryKey(OrderPresentInfo record);
List<OrderPresentInfo> getAllOrderPresent();
OrderPresentInfoMapper.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.home.orderpresentdemo.mapper.OrderPresentInfoMapper" >
<resultMap id="BaseResultMap" type="com.home.orderpresentdemo.entity.OrderPresentInfo" >
<id column="ID" property="id" jdbcType="BIGINT" />
<result column="ACTIVITY_NAME" property="activityName" jdbcType="VARCHAR" />
<result column="BEGIN_TIME" property="beginTime" jdbcType="TIMESTAMP" />
<result column="END_TIME" property="endTime" jdbcType="TIMESTAMP" />
<result column="ACTIVITY_STORES_SELECT_TYPE" property="activityStoresSelectType" jdbcType="INTEGER" />
<result column="ACTIVITY_STORES_IDS" property="activityStoresIds" jdbcType="VARCHAR" />
<result column="MEMBER_LEVEL_SELECT_TYPE" property="memberLevelSelectType" jdbcType="INTEGER" />
<result column="MEMBER_LEVEL_IDS" property="memberLevelIds" jdbcType="VARCHAR" />
<result column="ACTIVITY_ORDER_CONSUME" property="activityOrderConsume" jdbcType="DECIMAL" />
<result column="PAYMENT_CHANNEL_IDS" property="paymentChannelIds" jdbcType="VARCHAR" />
<result column="EQUITY_TYPE" property="equityType" jdbcType="INTEGER" />
<result column="COUPON_ID" property="couponId" jdbcType="BIGINT" />
<result column="LUCKY_TURNING_ID" property="luckyTurningId" jdbcType="BIGINT" />
<result column="ACTIVITY_STATUS" property="activityStatus" jdbcType="INTEGER" />
<result column="CREATE_TIME" property="createTime" jdbcType="TIMESTAMP" />
<result column="UPDATE_TIME" property="updateTime" jdbcType="TIMESTAMP" />
</resultMap>
<sql id="Base_Column_List" >
ID, ACTIVITY_NAME, BEGIN_TIME, END_TIME, ACTIVITY_STORES_SELECT_TYPE, ACTIVITY_STORES_IDS,
MEMBER_LEVEL_SELECT_TYPE, MEMBER_LEVEL_IDS, ACTIVITY_ORDER_CONSUME, PAYMENT_CHANNEL_IDS,
EQUITY_TYPE, COUPON_ID, LUCKY_TURNING_ID, ACTIVITY_STATUS, CREATE_TIME, UPDATE_TIME
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Long" >
select
<include refid="Base_Column_List" />
from dss_wsh_order_present_info
where ID = #id,jdbcType=BIGINT
</select>
<select id="getAllOrderPresent" resultMap="BaseResultMap" >
select
<include refid="Base_Column_List" />
from dss_wsh_order_present_info
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Long" >
delete from dss_wsh_order_present_info
where ID = #id,jdbcType=BIGINT
</delete>
<insert id="insert" parameterType="com.home.orderpresentdemo.entity.OrderPresentInfo" >
insert into dss_wsh_order_present_info (ID, ACTIVITY_NAME, BEGIN_TIME,
END_TIME, ACTIVITY_STORES_SELECT_TYPE, ACTIVITY_STORES_IDS,
MEMBER_LEVEL_SELECT_TYPE, MEMBER_LEVEL_IDS,
ACTIVITY_ORDER_CONSUME, PAYMENT_CHANNEL_IDS,
EQUITY_TYPE, COUPON_ID, LUCKY_TURNING_ID,
ACTIVITY_STATUS, CREATE_TIME, UPDATE_TIME
)
values (#id,jdbcType=BIGINT, #activityName,jdbcType=VARCHAR, #beginTime,jdbcType=TIMESTAMP,
#endTime,jdbcType=TIMESTAMP, #activityStoresSelectType,jdbcType=INTEGER, #activityStoresIds,jdbcType=VARCHAR,
#memberLevelSelectType,jdbcType=INTEGER, #memberLevelIds,jdbcType=VARCHAR,
#activityOrderConsume,jdbcType=DECIMAL, #paymentChannelIds,jdbcType=VARCHAR,
#equityType,jdbcType=INTEGER, #couponId,jdbcType=BIGINT, #luckyTurningId,jdbcType=BIGINT,
#activityStatus,jdbcType=INTEGER, #createTime,jdbcType=TIMESTAMP, #updateTime,jdbcType=TIMESTAMP
)
</insert>
<insert id="insertSelective" parameterType="com.home.orderpresentdemo.entity.OrderPresentInfo" >
insert into dss_wsh_order_present_info
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
ID,
</if>
<if test="activityName != null" >
ACTIVITY_NAME,
</if>
<if test="beginTime != null" >
BEGIN_TIME,
</if>
<if test="endTime != null" >
END_TIME,
</if>
<if test="activityStoresSelectType != null" >
ACTIVITY_STORES_SELECT_TYPE,
</if>
<if test="activityStoresIds != null" >
ACTIVITY_STORES_IDS,
</if>
<if test="memberLevelSelectType != null" >
MEMBER_LEVEL_SELECT_TYPE,
</if>
<if test="memberLevelIds != null" >
MEMBER_LEVEL_IDS,
</if>
<if test="activityOrderConsume != null" >
ACTIVITY_ORDER_CONSUME,
</if>
<if test="paymentChannelIds != null" >
PAYMENT_CHANNEL_IDS,
</if>
<if test="equityType != null" >
EQUITY_TYPE,
</if>
<if test="couponId != null" >
COUPON_ID,
</if>
<if test="luckyTurningId != null" >
LUCKY_TURNING_ID,
</if>
<if test="activityStatus != null" >
ACTIVITY_STATUS,
</if>
<if test="createTime != null" >
CREATE_TIME,
</if>
<if test="updateTime != null" >
UPDATE_TIME,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#id,jdbcType=BIGINT,
</if>
<if test="activityName != null" >
#activityName,jdbcType=VARCHAR,
</if>
<if test="beginTime != null" >
#beginTime,jdbcType=TIMESTAMP,
</if>
<if test="endTime != null" >
#endTime,jdbcType=TIMESTAMP,
</if>
<if test="activityStoresSelectType != null" >
#activityStoresSelectType,jdbcType=INTEGER,
</if>
<if test="activityStoresIds != null" >
#activityStoresIds,jdbcType=VARCHAR,
</if>
<if test="memberLevelSelectType != null" >
#memberLevelSelectType,jdbcType=INTEGER,
</if>
<if test="memberLevelIds != null" >
#memberLevelIds,jdbcType=VARCHAR,
</if>
<if test="activityOrderConsume != null" >
#activityOrderConsume,jdbcType=DECIMAL,
</if>
<if test="paymentChannelIds != null" >
#paymentChannelIds,jdbcType=VARCHAR,
</if>
<if test="equityType != null" >
#equityType,jdbcType=INTEGER,
</if>
<if test="couponId != null" >
#couponId,jdbcType=BIGINT,
</if>
<if test="luckyTurningId != null" >
#luckyTurningId,jdbcType=BIGINT,
</if>
<if test="activityStatus != null" >
#activityStatus,jdbcType=INTEGER,
</if>
<if test="createTime != null" >
#createTime,jdbcType=TIMESTAMP,
</if>
<if test="updateTime != null" >
#updateTime,jdbcType=TIMESTAMP,
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.home.orderpresentdemo.entity.OrderPresentInfo" >
update dss_wsh_order_present_info
<set >
<if test="activityName != null" >
ACTIVITY_NAME = #activityName,jdbcType=VARCHAR,
</if>
<if test="beginTime != null" >
BEGIN_TIME = #beginTime,jdbcType=TIMESTAMP,
</if>
<if test="endTime != null" >
END_TIME = #endTime,jdbcType=TIMESTAMP,
</if>
<if test="activityStoresSelectType != null" >
ACTIVITY_STORES_SELECT_TYPE = #activityStoresSelectType,jdbcType=INTEGER,
</if>
<if test="activityStoresIds != null" >
ACTIVITY_STORES_IDS = #activityStoresIds,jdbcType=VARCHAR,
</if>
<if test="memberLevelSelectType != null" >
MEMBER_LEVEL_SELECT_TYPE = #memberLevelSelectType,jdbcType=INTEGER,
</if>
<if test="memberLevelIds != null" >
MEMBER_LEVEL_IDS = #memberLevelIds,jdbcType=VARCHAR,
</if>
<if test="activityOrderConsume != null" >
ACTIVITY_ORDER_CONSUME = #activityOrderConsume,jdbcType=DECIMAL,
</if>
<if test="paymentChannelIds != null" >
PAYMENT_CHANNEL_IDS = #paymentChannelIds,jdbcType=VARCHAR,
</if>
<if test="equityType != null" >
EQUITY_TYPE = #equityType,jdbcType=INTEGER,
</if>
<if test="couponId != null" >
COUPON_ID = #couponId,jdbcType=BIGINT,
</if>
<if test="luckyTurningId != null" >
LUCKY_TURNING_ID = #luckyTurningId,jdbcType=BIGINT,
</if>
<if test="activityStatus != null" >
ACTIVITY_STATUS = #activityStatus,jdbcType=INTEGER,
</if>
<if test="createTime != null" >
CREATE_TIME = #createTime,jdbcType=TIMESTAMP,
</if>
<if test="updateTime != null" >
UPDATE_TIME = #updateTime,jdbcType=TIMESTAMP,
</if>
</set>
where ID = #id,jdbcType=BIGINT
</update>
<update id="updateByPrimaryKey" parameterType="com.home.orderpresentdemo.entity.OrderPresentInfo" >
update dss_wsh_order_present_info
set ACTIVITY_NAME = #activityName,jdbcType=VARCHAR,
BEGIN_TIME = #beginTime,jdbcType=TIMESTAMP,
END_TIME = #endTime,jdbcType=TIMESTAMP,
ACTIVITY_STORES_SELECT_TYPE = #activityStoresSelectType,jdbcType=INTEGER,
ACTIVITY_STORES_IDS = #activityStoresIds,jdbcType=VARCHAR,
MEMBER_LEVEL_SELECT_TYPE = #memberLevelSelectType,jdbcType=INTEGER,
MEMBER_LEVEL_IDS = #memberLevelIds,jdbcType=VARCHAR,
ACTIVITY_ORDER_CONSUME = #activityOrderConsume,jdbcType=DECIMAL,
PAYMENT_CHANNEL_IDS = #paymentChannelIds,jdbcType=VARCHAR,
EQUITY_TYPE = #equityType,jdbcType=INTEGER,
COUPON_ID = #couponId,jdbcType=BIGINT,
LUCKY_TURNING_ID = #luckyTurningId,jdbcType=BIGINT,
ACTIVITY_STATUS = #activityStatus,jdbcType=INTEGER,
CREATE_TIME = #createTime,jdbcType=TIMESTAMP,
UPDATE_TIME = #updateTime,jdbcType=TIMESTAMP
where ID = #id,jdbcType=BIGINT
</update>
</mapper>SqlMapperConfig.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<!-- 对在此配置文件下的所有cache进行全局性开/关设置 true|false true -->
<setting name="cacheEnabled" value="true" />
<!-- 全局性设置懒加载。如果设为‘关',则所有相关联的都会被初始化加载。 -->
<setting name="lazyLoadingEnabled" value="true" />
<!-- 当设置为‘开’的时候，懒加载的对象可能被任何懒属性全部加载。否则，每个属性都按需加载。 -->
<setting name="aggressiveLazyLoading" value="true" />
<!-- 允许和不允许单条语句返回多个数据集（取决于驱动需求） -->
<setting name="multipleResultSetsEnabled" value="true" />
<!-- 使用列标签代替列名称。不用的驱动器有不同的作法。 -->
<setting name="localCacheScope" value="STATEMENT" />
<!-- 允许JDBC生成主键。需要驱动器支持.如果设为了true，这个设置将强制使用被生成的主键， 有一些驱动器不兼容不过仍然可以执行。 -->
<setting name="useGeneratedKeys" value="true" />
<!-- 指定MyBatis是否并且如何来自动映射数据表字段与对象的属性。PARTIAL将只自动映射简单的，NONE没有嵌套的结果。 FULL将自动映射所有复杂的结果。 -->
<setting name="autoMappingBehavior" value="PARTIAL" />
<!-- 配置和设定执行器，SIMPLE执行器执行其它语句。REUSE执行器可能重复使用preparedstatements语句，BATCH执行器可以重复执行语句和批量更新。 -->
<setting name="defaultExecutorType" value="SIMPLE" />
<!-- 设置一个时限，以决定让驱动器等待数据库回应的多长时间为超时. 正整数 -->
<setting name="defaultStatementTimeout" value="5000" />
<setting name="jdbcTypeForNull" value="OTHER"/>
<setting name="logImpl" value="LOG4J"/>
</settings>
</configuration>
index.html(这里测试写的比较随意,可以忽略):
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8">
<title>第一个HTML页面</title>
</head>
<body>
<h1>Hello Spring Boot!!!</h1>
<a th:href="@/goToAdd">添加</a>
<p th:text="$hello"></p>
<div>
<p th:text="$say"></p>
</div>
</body>
</html>application.properties:
#server.port=80
logging.level.org.springframework=DEBUG
#springboot mybatis
#jiazai mybatis peizhiwenjian
mybatis.mapper-locations = classpath:mapper/*Mapper.xml
#mybatis.config-location = classpath:mybatis/sqlMapConfig.xml
#mybatis.type-aliases-package = com.demo.bean
#shujuyuan
spring.datasource.driver-class-name= com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/dss_wshop?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = root
spring.thymeleaf.prefix=classpath:/templates/
#禁止thymeleaf缓存（建议：开发环境设置为false，生成环境设置为true）
spring.thymeleaf.cache=false
#pagehelper分页插件配置 以下属性不加也可以实现分页功能
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql获得结果如下所示:
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