springboot整合druid、mybatis以及pagehelper

配置druid

druid學習地址
https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter

導入pom依賴

<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>

application.yml

spring:
  datasource:
    #1.JDBC
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/normal?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
    username: root
    password: 123
    druid:
      #2.連接池配置
      #初始化連接池的連接數量 大小，最小，最大
      initial-size: 5
      min-idle: 5
      max-active: 20
      #配置獲取連接等待超時的時間
      max-wait: 60000
      #配置間隔多久才進行一次檢測，檢測需要關閉的空閒連接，單位是毫秒
      time-between-eviction-runs-millis: 60000
      # 配置一個連接在池中最小生存的時間，單位是毫秒
      min-evictable-idle-time-millis: 30000
      validation-query: SELECT 1 FROM DUAL
      test-while-idle: true
      test-on-borrow: true
      test-on-return: false
      # 是否緩存preparedStatement，也就是PSCache  官方建議MySQL下建議關閉   個人建議如果想用SQL防火牆 建議打開
      pool-prepared-statements: true
      max-pool-prepared-statement-per-connection-size: 20
      # 配置監控統計攔截的filters，去掉後監控界面sql無法統計，'wall'用於防火牆
      filter:
        stat:
          merge-sql: true
          slow-sql-millis: 5000
      #3.基礎監控配置
      web-stat-filter:
        enabled: true
        url-pattern: /*
        #設置不統計哪些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
        #設置監控頁面的登錄名和密碼
        login-username: admin
        login-password: admin
        allow: 127.0.0.1
        #deny: 192.168.1.100

路徑：localhost/druid/login.html

整合mybatis逆向生成

導入pom依賴和配置

<!--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>
    <!--解決mybatis-generator-maven-plugin運行時沒有將XxxMapper.xml文件放入target文件夾的問題-->
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
    </resource>
    <!--解決mybatis-generator-maven-plugin運行時沒有將jdbc.properites文件放入target文件夾的問題-->
    <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驅動 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
    </dependencies>
    <configuration>
        <overwrite>true</overwrite>
    </configuration>
</plugin>

導入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"/>

    <!--指定數據庫jdbc驅動jar包的位置-->
    <classPathEntry location="D:\initPath\Maven\mvn_repository\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar"/>

    <!-- 一個數據庫一個context -->
    <context id="infoGuardian">
        <!-- 註釋 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/><!-- 是否取消註釋 -->
            <property name="suppressDate" value="true"/> <!-- 是否生成註釋代時間戳 -->
        </commentGenerator>

        <!-- jdbc連接 -->
        <jdbcConnection driverClass="${jdbc.driver}"
                        connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>

        <!-- 類型轉換 -->
        <javaTypeResolver>
            <!-- 是否使用bigDecimal， false可自動轉化以下類型（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：指定在該項目下所在的路徑  -->
        <javaModelGenerator targetPackage="com.lst.springboot02.entity"
                            targetProject="src/main/java">
            <!-- 是否允許子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
            <!-- 是否對model添加構造函數 -->
            <property name="constructorBased" value="true"/>
            <!-- 是否針對string類型的字段在set的時候進行trim調用 -->
            <property name="trimStrings" value="false"/>
            <!-- 建立的Model對象是否 不可改變  即生成的Model對象不會有 setter方法，只有構造方法 -->
            <property name="immutable" value="false"/>
        </javaModelGenerator>

        <!-- 02 指定sql映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="com.lst.springboot02.mapper"
                         targetProject="src/main/java">
            <!-- 是否允許子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- 03 生成XxxMapper接口 -->
        <!-- type="ANNOTATEDMAPPER",生成Java Model 和基於註解的Mapper對象 -->
        <!-- type="MIXEDMAPPER",生成基於註解的Java Model 和相應的Mapper對象 -->
        <!-- type="XMLMAPPER",生成SQLMap XML文件和獨立的Mapper接口 -->
        <javaClientGenerator targetPackage="com.lst.springboot02.mapper"
                             targetProject="src/main/java" type="XMLMAPPER">
            <!-- 是否在當前路徑下新加一層schema,false路徑com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] -->
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <!-- 配置表信息 -->
        <!-- schema即爲數據庫名 -->
        <!-- tableName爲對應的數據庫表 -->
        <!-- domainObjectName是要生成的實體類 -->
        <!-- enable*ByExample是否生成 example類 -->

        <table schema="" tableName="t_mvc_book" domainObjectName="Book"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
            <property name="useActualColumnNames" value="true" />
        </table>


    </context>
</generatorConfiguration>

配置逆向生成的命令
mybatis-generator:generate -e
然後我們還需要再啓動類中添加註解，自動掃描Mapper包
@MapperScan(“com.xy.springboot02.mapper”)
啓用事物管理器
@EnableTransactionManagement
啓用動態代理
@EnableAspectJAutoProxy

Springboot02ApplicationTests

package com.lst.springboot02;

import com.lst.springboot02.entity.Book;
import com.lst.springboot02.service.BookService;
import com.lst.springboot02.utils.PageBean;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@SpringBootTest
class Springboot02ApplicationTests {
    @Autowired
    private BookService bookService;


    @Test
    public void deleteByPrimaryKey() {
        bookService.deleteByPrimaryKey(13);
    }

    @Test
    public void selectByPrimaryKey() {
        Book book = bookService.selectByPrimaryKey(13);
        System.out.println(book);
    }
}

整合pagehelper

導入pom依賴

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.2.3</version>
</dependency>

application.yml中引入相關配置

#pagehelper分頁插件配置
pagehelper:
  helperDialect: mysql
  reasonable: true
  supportMethodsArguments: true
  params: count=countSql

#顯示日誌
logging:
  level:
    com.xy.springboot02.mapper: debug

工具類PageBean

package com.lst.springboot02.utils;

import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;

public class PageBean implements Serializable {

	private static final long serialVersionUID = 2422581023658455731L;

	//頁碼
	private int page=1;
	//每頁顯示記錄數
	private int rows=10;
	//總記錄數
	private int total=0;
	//是否分頁
	private boolean isPagination=true;
	//上一次的請求路徑
	private String url;
	//獲取所有的請求參數
	private Map<String,String[]> map;

	public PageBean() {
		super();
	}

	//設置請求參數
	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);
	}

	/**
	 * 獲取分頁起始標記位置
	 * @return
	 */
	public int getStartIndex() {
		//(當前頁碼-1)*顯示記錄數
		return (this.getPage()-1)*this.rows;
	}

	/**
	 * 末頁
	 * @return
	 */
	public int getMaxPage() {
		int totalpage=this.total/this.rows;
		if(this.total%this.rows!=0)
			totalpage++;
		return totalpage;
	}

	/**
	 * 下一頁
	 * @return
	 */
	public int getNextPage() {
		int nextPage=this.page+1;
		if(this.page>=this.getMaxPage())
			nextPage=this.getMaxPage();
		return nextPage;
	}

	/**
	 * 上一頁
	 * @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
				+ "]";
	}
}

分頁切面PagerAspect

package com.lst.springboot02.aspect;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.lst.springboot02.utils.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.*Page(..))")
    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;
    }
}

BookMapper

List<Map> bookPage(Map map);

BookMapper.xml

<select id="bookPage" resultType="java.util.Map" parameterType="java.util.Map">
    select * from t_mvc_book
    <where>
      <if test="bname != null">
        and bname like concat ('%',#{bname},'%')
      </if>
    </where>
  </select>

BookService

    List<Map> bookPage(Map map, PageBean pageBean);

BookServiceImpl

@Override
    public List<Map> bookPage(Map map, PageBean pageBean) {
        return bookMapper.bookPage(map);
    }

Springboot02ApplicationTests

	@Test
    public void bookPager(){
        Map map = new HashMap();
        map.put("bname","聖墟");
        PageBean pageBean = new PageBean();
        pageBean.setPage(2);
        List<Map> list = this.bookService.bookPage(map,pageBean);
        for (Map m : list) {
            System.out.println(m);
        }
        System.out.println(pageBean);
    }

效果展示：

over。。。