剛學完Mybatis，Spring，SpringMVC

嘗試進行一個整合開發，記錄一下搭建流程

1.環境與開發工具

IDEA

MySQL?8.0.16

Tomcat 9.0.21

Maven 3.6.1

2.項目準備

1.創建一個maven工程

?2.依賴注入

<dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.16</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.1</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>2.5</version></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.2</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.2</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.2</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.8.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.8.RELEASE</version></dependency></dependencies>

3.配置靜態資源導出

<build><resources><resource><directory>src/main/java</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource><resource><directory>src/main/resources</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource></resources></build>

4.連接數據庫

?這里可能連接失敗報錯[08001] Could not create connection to database server. Attempted reconnect 3 times. Giving up.

是因為系統默認的時區與IDEA連接數據庫的時區 (MySQL默認時區為UTC) 不一致

按照格林威治的時間，我們屬于東八區時間，領先UTC八個小時，所以說存在8小時的時差，需要修改

MySQL 8.0以上才存在此問題，如使用的是MySQL 5.7可以忽略

3.編寫配置文件

1.applicationContext.xml

<?xml version="" encoding="UTF-8" ?><beans xmlns=""xmlns:xsi=""xsi:schemaLocation="/spring-beans.xsd"><import resource="classpath:"/><import resource="classpath:"/><import resource="classpath:"/></beans>

2.

<?xml version="" encoding="UTF-8" ?><!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN"""><configuration><typeAliases><package name=""/></typeAliases><mappers><mapper class=""/></mappers></configuration>

3.

4.編寫Mybatis層

1.與數據表對應的簡單實體類(pojo)

2.與各實體類對應的Mapper接口(dao)

3.各接口的實現類(service)

整合dao層

1.關聯數據庫配置文件()

<context:property-placeholder location="classpath:"/>

2.連接池

<bean id="dataSource" class=""><property name="driver" value="${}"/><property name="url" value="${}"/><property name="username" value="${}"/><property name="password" value="${}"/></bean>

這里使用的是Druid，也可以使用c3p0、dbcp等

3.sqlSessionFactory

<bean id="sqlSessionFactory" class=""><property name="dataSource" ref="dataSource"/><property name="configLocation" value="classpath:"/></bean>

4.配置dao接口掃描包，動態實現dao接口注入到Spring容器

<bean class=""><property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/><property name="basePackage" value=""/></bean>

整合Service層

1.掃描service下的包

<context:component-scan base-package=""/>

2.將業務類注入Spring(可注解實現)

3.聲明式事務配置

<bean id="transactionManager" class=""><property name="dataSource" ref="dataSource"/></bean>

7.整合SpringMVC

?1.給maven項目增加web支持

?2.在配置DispathcherServlet

<servlet><servlet-name>spring-mvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>spring-mvc</servlet-name><url-pattern>/</url-pattern></servlet-mapping>

3.配置亂碼過濾

<filter><filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>utf-8</param-value></init-param></filter><filter-mapping><filter-name>encodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>

注意：/和/*的區別，前者不會掃描.jsp文件，后者會。所以過濾器這里需要寫/*，而DispathcherServlet核心分發器是/。

4.設置session過期時間

<session-config><session-timeout>15</session-timeout></session-config>

5.配置(處理器映射器、處理器適配器、視圖解析器)

其中，處理器映射器和處理器適配器在使用了注解驅動的情況下可以省略

<!--注解驅動--><mvc:annotation-driven/><!--靜態資源過濾--><mvc:default-servlet-handler/><!--掃描controller--><context:component-scan base-package=""/><!--視圖解析器--><bean class=""><property name="prefix" value="/WEB-INF/jsp/"/><property name="suffix" value=".jsp"/></bean>

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