目的：
1、springboot配置数据库连接池druid
2、springboot整合mybatis
3、springboot整合pagehelper
springboot配置数据库连接池druid
druid学习地址
https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter
新建springboot项目，把要用的服务选上
导入druid相关pom依赖
<!--导入druid所需pom依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
</dependency>
配置application.yml
application.yml配置devtools热加载
spring:
datasource:
#1.JDBC
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/t224?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
username: root
password: root
druid:
#2.连接池配置
#初始化连接池的连接数量 大小，最小，最大
initial-size: 5
min-idle: 5
max-active: 20
#配置获取连接等待超时的时间
max-wait: 60000
#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
time-between-eviction-runs-millis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
min-evictable-idle-time-millis: 30000
validation-query: SELECT 1 FROM DUAL
test-while-idle: true
test-on-borrow: true
test-on-return: false
# 是否缓存preparedStatement，也就是PSCache 官方建议MySQL下建议关闭 个人建议如果想用SQL防火墙 建议打开
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
filter:
stat:
merge-sql: true
slow-sql-millis: 5000
#3.基础监控配置
web-stat-filter:
enabled: true
url-pattern: /*
#设置不统计哪些URL
exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
session-stat-enable: true
session-stat-max-count: 100
stat-view-servlet:
enabled: true
url-pattern: /druid/*
reset-enable: true
#设置监控页面的登录名和密码
login-username: admin
login-password: admin
allow: 127.0.0.1
#deny: 192.168.1.100
pringboot整合druid成功截图
启动SpringBoot项目访问druid， http://localhost:tomcat端口号/项目名称/druid/
测试druid中url监控
创建一个测试类看看运行页面时，有没有检测到url
package com.ht.springboot02.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @author 黄大娘
* @company dogsun公司
* @create 2019-11-09 11:48
*/
@RestController
@RequestMapping("/dome")
public class HelloController {
@RequestMapping("/sc")
public String test01(){
return "常记溪亭日暮，沉醉不知归路.";
}
}
页面测试成功来着，我们看看druid监视是否成功
很明显监控到了，所以Springboot整合druid成功
springboot整合mybatis
首先相关整合需要的pom依赖必不可少
<!--更改springboot中的mysql版本，逆向生成不兼容高版本-->
<mysql.version>5.1.44</mysql.version> <dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
<scope>runtime</scope>
</dependency> <resources>
<!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
<resource>
<directory>src/main/resources</directory>
<includes>
<include>*.properties</include>
<include>*.xml</include>
<include>*.yml</include>
</includes>
</resource>
</resources> <plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<dependencies>
<!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
</dependencies>
<configuration>
<overwrite>true</overwrite>
</configuration>
</plugin>
添加逆向生成文件配置generatorConfig.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration>
<!-- 引入配置文件 -->
<properties resource="jdbc.properties"/> <!--指定数据库jdbc驱动jar包的位置-->
<classPathEntry location="C:\development_tool\maven_cang\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar"/> <!-- 一个数据库一个context -->
<context id="infoGuardian">
<!-- 注释 -->
<commentGenerator>
<property name="suppressAllComments" value="true"/><!-- 是否取消注释 -->
<property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 -->
</commentGenerator> <!-- jdbc连接 -->
<jdbcConnection driverClass="${jdbc.driver}"
connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/> <!-- 类型转换 -->
<javaTypeResolver>
<!-- 是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.） -->
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver> <!-- 01 指定javaBean生成的位置 -->
<!-- targetPackage：指定生成的model生成所在的包名 -->
<!-- targetProject：指定在该项目下所在的路径 -->
<javaModelGenerator targetPackage="com.ht.springboot02.entity"
targetProject="src/main/java">
<!-- 是否允许子包，即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
<!-- 是否对model添加构造函数 -->
<property name="constructorBased" value="true"/>
<!-- 是否针对string类型的字段在set的时候进行trim调用 -->
<property name="trimStrings" value="false"/>
<!-- 建立的Model对象是否 不可改变 即生成的Model对象不会有 setter方法，只有构造方法 -->
<property name="immutable" value="false"/>
</javaModelGenerator> <!-- 02 指定sql映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.ht.springboot02.mapper"
targetProject="src/main/java">
<!-- 是否允许子包，即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator> <!-- 03 生成XxxMapper接口 -->
<!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 -->
<!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 -->
<!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 -->
<javaClientGenerator targetPackage="com.ht.springboot02.mapper"
targetProject="src/main/java" type="XMLMAPPER">
<!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] -->
<property name="enableSubPackages" value="false"/>
</javaClientGenerator> <!-- 配置表信息 -->
<!-- schema即为数据库名 -->
<!-- tableName为对应的数据库表 -->
<!-- domainObjectName是要生成的实体类 -->
<!-- enable*ByExample是否生成 example类 --> <table schema="" tableName="t_mvc_book" domainObjectName="Book"
enableCountByExample="false" enableDeleteByExample="false"
enableSelectByExample="false" enableUpdateByExample="false">
<property name="useActualColumnNames" value="true" />
</table>
</context>
</generatorConfiguration>
jdbc.properties文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/t224?useUnicode=true&characterEncoding=UTF-8&nullCatalogMeansCurrent=true
jdbc.username=root
jdbc.password=root
逆向生成集成到maven中的命令
mybatis-generator:generate -e
测试查删案例
不能忘了在启动类中添加注解
@MapperScan("com.ht.springboot02.mapper")Springboot02ApplicationTests
package com.ht.springboot02; import com.ht.springboot02.entity.Book;
import com.ht.springboot02.service.BookService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest; @SpringBootTest
class Springboot02ApplicationTests { @Autowired
private BookService bookService;
@Test
public void deleteByPrimaryKey(){
bookService.deleteByPrimaryKey(12);
} @Test
public void selectByPrimaryKey(){
Book book = bookService.selectByPrimaryKey(12);
System.out.println(book);
} }
springboot整合pagehelper
导入pom依赖
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency>
在application.yml中引入相关配置
#pagehelper分页插件配置
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql #显示日志
logging:
level:
com.ht.springboot02.mapper: debug
PageBean工具类
package com.ht.springboot02.util;
import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;
public class PageBean implements Serializable {
private static final long serialVersionUID = 2422581023658455731L;
//页码
private int page = 1;
//每页显示记录数
private int rows = 10;
//总记录数
private int total = 0;
//是否分页
private boolean isPagination = true;
//上一次的请求路径
private String url;
//获取所有的请求参数
private Map<String, String[]> map; public PageBean() {
super();
}
//设置请求参数
public void setRequest(HttpServletRequest req) {
String page = req.getParameter("page");
String rows = req.getParameter("rows");
String pagination = req.getParameter("pagination");
this.setPage(page);
this.setRows(rows);
this.setPagination(pagination);
this.url = req.getContextPath() + req.getServletPath();
this.map = req.getParameterMap();
}
public String getUrl() {
return url;
} public void setUrl(String url) {
this.url = url;
} public Map<String, String[]> getMap() {
return map;
} public void setMap(Map<String, String[]> map) {
this.map = map;
} public int getPage() {
return page;
} public void setPage(int page) {
this.page = page;
} public void setPage(String page) {
if (null != page && !"".equals(page.trim()))
this.page = Integer.parseInt(page);
} public int getRows() {
return rows;
} public void setRows(int rows) {
this.rows = rows;
} public void setRows(String rows) {
if (null != rows && !"".equals(rows.trim()))
this.rows = Integer.parseInt(rows);
} public int getTotal() {
return total;
} public void setTotal(int total) {
this.total = total;
} public void setTotal(String total) {
this.total = Integer.parseInt(total);
} public boolean isPagination() {
return isPagination;
} public void setPagination(boolean isPagination) {
this.isPagination = isPagination;
} public void setPagination(String isPagination) {
if (null != isPagination && !"".equals(isPagination.trim()))
this.isPagination = Boolean.parseBoolean(isPagination);
}
/**
* 获取分页起始标记位置
*
* @return
*/
public int getStartIndex() {
//(当前页码-1)*显示记录数
return (this.getPage() - 1) * this.rows;
}
/**
* 末页
*
* @return
*/
public int getMaxPage() {
int totalpage = this.total / this.rows;
if (this.total % this.rows != 0)
totalpage++;
return totalpage;
}
/**
* 下一页
*
* @return
*/
public int getNextPage() {
int nextPage = this.page + 1;
if (this.page >= this.getMaxPage())
nextPage = this.getMaxPage();
return nextPage;
}
/**
* 上一页
*
* @return
*/
public int getPreivousPage() {
int previousPage = this.page - 1;
if (previousPage < 1)
previousPage = 1;
return previousPage;
} @Override
public String toString() {
return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", isPagination=" + isPagination
+ "]";
}
}
PagerAspect类
package com.ht.springboot02.aspcet;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.ht.springboot02.util.PageBean;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
import java.util.List;
@Component
@Aspect
public class PagerAspect {
@Around("execution(* *..*Service.*Pager(..))")
public Object invoke(ProceedingJoinPoint args) throws Throwable{
Object[] params = args.getArgs();
PageBean pageBean = null;
for (Object param : params) {
if(param instanceof PageBean){
pageBean = (PageBean) param;
break;
}
}
if (pageBean !=null && pageBean.isPagination())
PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
Object proceed = args.proceed(params);
if (pageBean !=null && pageBean.isPagination()){
PageInfo pageInfo = new PageInfo((List) proceed);
pageBean.setTotal(pageInfo.getTotal()+"");
}
return proceed;
}
}
转换格式Stringutil类
package com.ht.springboot02.util;
public class StringUtil {
public static String toLikeStr(String str){
return "%"+str+"%";
}
}
测试
@Test
public void bookPager(){
Map map = new HashMap();
map.put("bname","圣墟");
PageBean pageBean =new PageBean();
pageBean.setPage(5);
List<Map> list = this.bookService.bookPager(map,pageBean);
for (Map m : list){
System.out.println(m);
}
System.out.println(map);
}
效果：