SpringBoot+Mybatis+Druid的整合
市面上的的教程基本都是建立再使用者已經知道這幾個東西是什麼關係的基礎上進行部署,但個人在學習中發現一開始並沒有這幾個的定位,因此本章從零開始一步步推薦SpringBoot的安裝!
1----SpringBoot:是一個對SpringMVC進行了封裝的框架,原本的springmvc每次使用都是需要部署大量的配置,非常麻煩而且容易出錯,而springBoot在此基礎上對SpringMvc進行了高度封裝,使得後續的配置,變得更加簡單,甚至不用啟動tomcat!
2----Mybaits:一個用來載入資料來源,建立sqlsessionFactory來建立連線,然後利用執行器執行SQL語句的高效連線資料庫框架。
3---Druid:是阿里巴巴為了使用SpringBoot更建立的一個高效框架,可以用來部署資料庫資源!
本文基礎於此進行整合!開發工具為intellij
----------------------------------------------------------------------------------------------------------------------------------------------------------------------基本的目錄結構如下:
其中關係如下:
第一步:程式:demoApplication開始啟動,並配置註解以掃描全域性的註解資訊!
第二步:通過該類會逐漸啟動其內部封裝的spring和mybaits等整合資訊,該流程可以從部署中看到,依賴於pom.xml檔案的整合包執行,當執行到Mybatis的整合包時候,就會呼叫mybstis的資訊,開始連線資料庫!
第三步:當整合包於springBoot整合後,則呼叫druid載入連線池的資料來源,然後傳給Mybtais進行連線資料庫!
我們的資料庫檔案資訊是配置在application.yml中的,而資訊載入是在主包下面的druid資料夾中,配置
DruidConfiguration類進行載入!
第四步:SpringBoot在這裡已經基本配置好了,接下來是需要是先建立資料庫,然後使用逆向工程生成檔案資訊!
在資料庫中建立自己需要的資料庫,記得保持與applicaiton.yml和datasurce.properties檔案中的資料的檔案和密碼相同!
pom.xml中載入逆向工程外掛:
在Intellij面板的右側,開啟maven管理工具,找到當前該專案的配置(此處是pom.xml的具體化,maven pojoect會將下載下來的依賴包,外掛依據一定順序和規律放置在此處)
選中generator外掛,雙擊該外掛裡面的命令,千萬記住有且只可以執行一次該命令,否則生長出來的檔案資訊會產生亂碼覆蓋現象,mybatis會因混亂而報錯!
第五步:檢查報錯問題,本配置流程中需要注意的三個點是,druid的檔案是怎麼樣,application.yml的檔案是怎麼樣的,generator.xml的檔案是怎麼樣的,甚至pom.xml的檔案是怎麼樣的,有什麼需要注意的地方,以下將逐一貼出模板並說明!
<?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.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.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-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--繼承druid資料來源-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!--mybaits逆向工程-->
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
</project>
POM檔案:以上為我基本專案的POM檔案,也是一個 具備完整目錄結構的專案最純淨時候的結構;可以直接使用;
該POM的邏邏輯是:配置專案名+載入專案的框架資訊+載入要與該框架整合的jar包的整合包+載入各個被整合的jar包+載入外掛資訊!
package com.example.demo.druid;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import javax.sql.DataSource;
import java.sql.SQLException;
/**
* Created by xiabin on 2017/6/18.
*/
@Configuration
public class DruidConfiguration {
private static final Logger logger = LoggerFactory.getLogger(DruidConfiguration.class);
private static final String DB_PREFIX = "spring.datasource";
@Bean
public ServletRegistrationBean druidServlet() {
logger.info("init Druid Servlet Configuration ");
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
// IP白名單
servletRegistrationBean.addInitParameter("allow", "192.168.2.25,127.0.0.1");
// IP黑名單(共同存在時,deny優先於allow)
servletRegistrationBean.addInitParameter("deny", "192.168.1.100");
//控制檯管理使用者
servletRegistrationBean.addInitParameter("loginUsername", "admin");
servletRegistrationBean.addInitParameter("loginPassword", "9527");
//是否能夠重置資料 禁用HTML頁面上的“Reset All”功能
servletRegistrationBean.addInitParameter("resetEnable", "false");
return servletRegistrationBean;
}
@Bean
public FilterRegistrationBean filterRegistrationBean() {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return filterRegistrationBean;
}
//解決 spring.datasource.filters=stat,wall,log4j 無法正常註冊進去
@ConfigurationProperties(prefix = DB_PREFIX)
class IDataSourceProperties {
private String url;
private String username;
private String password;
private String driverClassName;
private int initialSize;
private int minIdle;
private int maxActive;
private int maxWait;
private int timeBetweenEvictionRunsMillis;
private int minEvictableIdleTimeMillis;
private String validationQuery;
private boolean testWhileIdle;
private boolean testOnBorrow;
private boolean testOnReturn;
private boolean poolPreparedStatements;
private int maxPoolPreparedStatementPerConnectionSize;
private String filters;
private String connectionProperties;
@Bean //宣告其為Bean例項
@Primary //在同樣的DataSource中,首先使用被標註的DataSource
public DataSource dataSource() {
DruidDataSource datasource = new DruidDataSource();
datasource.setUrl(url);
datasource.setUsername(username);
datasource.setPassword(password);
datasource.setDriverClassName(driverClassName);
//configuration
datasource.setInitialSize(initialSize);
datasource.setMinIdle(minIdle);
datasource.setMaxActive(maxActive);
datasource.setMaxWait(maxWait);
datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
datasource.setValidationQuery(validationQuery);
datasource.setTestWhileIdle(testWhileIdle);
datasource.setTestOnBorrow(testOnBorrow);
datasource.setTestOnReturn(testOnReturn);
datasource.setPoolPreparedStatements(poolPreparedStatements);
datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
try {
datasource.setFilters(filters);
} catch (SQLException e) {
System.err.println("druid configuration initialization filter: " + e);
}
datasource.setConnectionProperties(connectionProperties);
return datasource;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getDriverClassName() {
return driverClassName;
}
public void setDriverClassName(String driverClassName) {
this.driverClassName = driverClassName;
}
public int getInitialSize() {
return initialSize;
}
public void setInitialSize(int initialSize) {
this.initialSize = initialSize;
}
public int getMinIdle() {
return minIdle;
}
public void setMinIdle(int minIdle) {
this.minIdle = minIdle;
}
public int getMaxActive() {
return maxActive;
}
public void setMaxActive(int maxActive) {
this.maxActive = maxActive;
}
public int getMaxWait() {
return maxWait;
}
public void setMaxWait(int maxWait) {
this.maxWait = maxWait;
}
public int getTimeBetweenEvictionRunsMillis() {
return timeBetweenEvictionRunsMillis;
}
public void setTimeBetweenEvictionRunsMillis(int timeBetweenEvictionRunsMillis) {
this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
}
public int getMinEvictableIdleTimeMillis() {
return minEvictableIdleTimeMillis;
}
public void setMinEvictableIdleTimeMillis(int minEvictableIdleTimeMillis) {
this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
}
public String getValidationQuery() {
return validationQuery;
}
public void setValidationQuery(String validationQuery) {
this.validationQuery = validationQuery;
}
public boolean isTestWhileIdle() {
return testWhileIdle;
}
public void setTestWhileIdle(boolean testWhileIdle) {
this.testWhileIdle = testWhileIdle;
}
public boolean isTestOnBorrow() {
return testOnBorrow;
}
public void setTestOnBorrow(boolean testOnBorrow) {
this.testOnBorrow = testOnBorrow;
}
public boolean isTestOnReturn() {
return testOnReturn;
}
public void setTestOnReturn(boolean testOnReturn) {
this.testOnReturn = testOnReturn;
}
public boolean isPoolPreparedStatements() {
return poolPreparedStatements;
}
public void setPoolPreparedStatements(boolean poolPreparedStatements) {
this.poolPreparedStatements = poolPreparedStatements;
}
public int getMaxPoolPreparedStatementPerConnectionSize() {
return maxPoolPreparedStatementPerConnectionSize;
}
public void setMaxPoolPreparedStatementPerConnectionSize(int maxPoolPreparedStatementPerConnectionSize) {
this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;
}
public String getFilters() {
return filters;
}
public void setFilters(String filters) {
this.filters = filters;
}
public String getConnectionProperties() {
return connectionProperties;
}
public void setConnectionProperties(String connectionProperties) {
this.connectionProperties = connectionProperties;
}
}
}
DruidConfiguration :這是Druid的配置資料來源模組,相對較為完美的一個模板,可以正常黏貼使用;
#預設使用配置
spring:
profiles:
active: dev
#公共配置與profiles選擇無關 mapperLocations指的路徑是src/main/resources
#公共配置與profiles選擇無關
mybatis:
typeAliasesPackage: com.example.demo.pojo
mapperLocations: classpath:mappers/*.xml
---
#開發配置
spring:
profiles: dev
datasource:
url: jdbc:mysql://localhost:3306/mmall
username: root
password: 123
driverClassName: com.mysql.jdbc.Driver
# 使用druid資料來源
type: com.alibaba.druid.pool.DruidDataSource
# 配置獲取連線等待超時的時間
# 下面為連線池的補充設定,應用到上面所有資料來源中
# 初始化大小,最小,最大
initialSize: 1
minIdle: 3
maxActive: 20
# 配置獲取連線等待超時的時間
maxWait: 60000
# 配置間隔多久才進行一次檢測,檢測需要關閉的空閒連線,單位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一個連線在池中最小生存的時間,單位是毫秒
minEvictableIdleTimeMillis: 30000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
# 開啟PSCache,並且指定每個連線上PSCache的大小
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
# 配置監控統計攔截的filters,去掉後監控介面sql無法統計,'wall'用於防火牆
filters: stat,wall,slf4j
# 通過connectProperties屬性來開啟mergeSql功能;慢SQL記錄
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合併多個DruidDataSource的監控資料
useGlobalDataSourceStat: true
被Druid模板載入的資料來源檔案資訊,根據個人資料靈活配置,如果保錯,請檢視欄位資訊是否與druid的配置檔案吻合!
逆向工程檔案:generator.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>
<!--匯入屬性配置-->
<properties resource="datasource.properties"></properties><!--匯入連結資料庫的引數和驅動-->
<!--指定特定資料庫的jdbc驅動jar包的位置-->
<classPathEntry location="${db.driverLocation}"/>
<context id="default" targetRuntime="MyBatis3">
<!-- optional,旨在建立class時,對註釋進行控制 -->
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--jdbc的資料庫連線 -->
<jdbcConnection
driverClass="${db.driverClassName}"
connectionURL="${db.url}"
userId="${db.username}"
password="${db.password}">
</jdbcConnection>
<!-- 非必需,型別處理器,在資料庫型別和java型別之間的轉換控制--><!--一般保持預設-->
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- Model模型生成器,用來生成含有主鍵key的類,記錄類 以及查詢Example類
targetPackage 指定生成的model生成所在的包名
targetProject 指定在該專案下所在的路徑
-->
<!--<javaModelGenerator targetPackage="com.mmall.pojo" targetProject=".\src\main\java">-->
<javaModelGenerator targetPackage="com.example.demo.pojo" targetProject="./src/main/java">
<!-- 是否允許子包,即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
<!-- 是否對model新增 建構函式 -->
<property name="constructorBased" value="true"/>
<!-- 是否對類CHAR型別的列的資料進行trim操作 -->
<property name="trimStrings" value="true"/>
<!-- 建立的Model物件是否 不可改變 即生成的Model物件不會有 setter方法,只有構造方法 -->
<property name="immutable" value="false"/>
</javaModelGenerator>
<!--mapper對映檔案生成所在的目錄 為每一個數據庫的表生成對應的SqlMap檔案 -->
<!--<sqlMapGenerator targetPackage="mappers" targetProject=".\src\main\resources">-->
<sqlMapGenerator targetPackage="mappers" targetProject="./src/main/resources">
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<!-- 客戶端程式碼,生成易於使用的針對Model物件和XML配置檔案 的程式碼
type="ANNOTATEDMAPPER",生成Java Model 和基於註解的Mapper物件
type="MIXEDMAPPER",生成基於註解的Java Model 和相應的Mapper物件
type="XMLMAPPER",生成SQLMap XML檔案和獨立的Mapper介面
-->
<!-- targetPackage:mapper介面dao生成的位置 -->
<!--<javaClientGenerator type="XMLMAPPER" targetPackage="com.mmall.dao" targetProject=".\src\main\java">-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.example.demo.dao" targetProject="./src/main/java">
<!-- enableSubPackages:是否讓schema作為包的字尾 -->
<property name="enableSubPackages" value="false" />
</javaClientGenerator>
<table tableName="mmall_shipping" domainObjectName="Shipping" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<table tableName="mmall_cart" domainObjectName="Cart" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<table tableName="mmall_cart_item" domainObjectName="CartItem" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<table tableName="mmall_category" domainObjectName="Category" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<table tableName="mmall_order" domainObjectName="Order" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<table tableName="mmall_order_item" domainObjectName="OrderItem" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<table tableName="mmall_pay_info" domainObjectName="PayInfo" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<table tableName="mmall_product" domainObjectName="Product" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
<columnOverride column="detail" jdbcType="VARCHAR" />
<columnOverride column="sub_images" jdbcType="VARCHAR" /><!--存入資料庫的是text,但是在資料庫中為保持穩定使用string-->
</table>
<table tableName="mmall_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
<!-- geelynote mybatis外掛的搭建 -->
<!--僅僅用來作為建立逆向工程-->
</context>
</generatorConfiguration>
逆向工程資料來源檔案:datasource.properties
db.driverLocation=D:/Intellij201725/LocalRepository/repository/mysql/mysql-connector-java/5.1.6/mysql-connector-java-5.1.6.jar
db.driverClassName=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/mmall?characterEncoding=utf-8
db.username=root
db.password=123
db.initialSize = 20
db.maxActive = 50
db.maxIdle = 20
db.minIdle = 10
db.maxWait = 10
db.defaultAutoCommit = true
db.minEvictableIdleTimeMillis = 3600000
第七步:報錯自檢查
1.資料來源連線檔案錯誤
2.逆向工程多次執行
3.逆向工程檔案路徑錯誤,沿用我個人的路徑和資料夾資訊
4.POM檔案依賴衝突(比較少見,除非自己去手改)
5.資料配置模組,程式碼引數維護錯誤
6.入口程式啟動檔案掃描出錯
7.mapper.xml檔案出錯
8.資料庫異常
9.密碼錯誤
10.註解遺漏
11.歡迎上報