Tomcat與Servlet
阿新 • • 發佈：2022-05-11
具體程式碼放在gitee上，可直接下載參考 ssmdemo https://gitee.com/liqiju/ssmdemo ；本文章只對配置檔案進行簡單介紹；
1. 整合思路
Spring MVC是Spring框架中的一個模組，所以Spring MVC與Spring之間不需要整合，只需要引入相應jar包就可以直接使用。SSM框架的整合只需要在Spring與MyBatis之間和Spring MVC與MyBatis之間進行整合。
通過Spring例項化Bean，然後呼叫例項物件中的查詢方法來執行MyBatis對映檔案中的SQL語句，如果能夠正確查詢出資料庫中的資料，就可以認為Spring與MyBatis框架整合成功。
如果可以通過前臺頁面來執行查詢方法，並且查詢出的資料能夠在頁面中正確顯示，那麼可以認為SSM三大框架整合成功。
2. SSM程式碼結構
3. 配置檔案介紹
3.1 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.xxx</groupId> <artifactId>ssmdemo</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>ssmdemo Maven Webapp</name> <!-- FIXME change it to the project's website --> <url>http://www.example.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> </properties> <dependencies> <!-- spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.3.19</version> </dependency> <!-- spring jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.3.19</version> </dependency> <!-- spring webmvc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.3.15</version> </dependency> <!-- mysql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <!-- druid連線池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.2.8</version> </dependency> <!-- mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.7</version> </dependency> <!-- mybatis-spring --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.6</version> </dependency> <!-- jackson 必須匯入，否則使用@RestController或@ResponseBody會報錯 --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.13.2</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.13.2</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.13.2.2</version> </dependency> </dependencies> <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> </project>
3.2 db.properties
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/你的資料庫?useSSL=false
jdbc.username=你的使用者名稱
jdbc.password=你的資料庫密碼
jdbc.maxActive=30
jdbc.maxWait=10
jdbc.initialSize=5
3.3 applicationContext.xml
在實際開發時，為了避免Spring配置檔案中的資訊過於臃腫，通常會將Spring配置檔案中的資訊按照不同的功能分散在多個配置檔案中。
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<!-- 1. 讀取db.properties -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 2. 配置資料來源（druid） -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driverClass}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="initialSize" value="${jdbc.initialSize}"/>
<property name="maxActive" value="${jdbc.maxActive}"/>
<property name="maxWait" value="${jdbc.maxWait}"/>
</bean>
<!-- 3. 配置mybatis工廠（mybatis-spring提供） -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入資料來源 -->
<property name="dataSource" ref="dataSource"/>
<!-- 指定mybatis配置檔案位置 -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 4. 配置mapper掃描器（mybatis-spring提供） -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.xxx.mapper"/>
</bean>
</beans>
3.4 mybatis-config.xml
由於在Spring配置檔案中已經配置了資料來源資訊以及mapper介面檔案掃描器，因此在MyBatis的配置檔案中只需要根據POJO類路徑進行別名配置即可。
<?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>的子元素必須按照由上到下的順序進行配置，否則MyBatis在解析XML配置檔案的時候會報錯-->
<configuration>
<!-- 配置別名 -->
<typeAliases>
<package name="com.xxx.entity"/>
</typeAliases>
</configuration>
3.5 springmvc-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 1. 配置會自動向上下文中註冊RequestMappingHandlerMapping和RequestMappingHandlerAdapter兩個Bean，
並提供對讀寫XML和讀寫JSON等功能的支援 -->
<mvc:annotation-driven/>
<!-- 2. 讓Spring MVC不處理靜態資源 -->
<mvc:default-servlet-handler/>
<!-- 3. 掃描controller, service包 -->
<context:component-scan base-package="com.xxx.controller,com.xxx.service"/>
<!-- 4. 檢視解析器（jsp）-->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--設定字首-->
<property name="prefix" value="/WEB-INF/jsp/"/>
<!--設定字尾-->
<property name="suffix" value=".jsp"/>
</bean>
</beans>
3.6 web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!-- 1. 使用監聽器載入applicationContext.xml配置檔案 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 2. 配置Springmvc前端控制器 -->
<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:springmvc-config.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>
<!-- 編碼過濾器 -->
<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>
</web-app>
4. 我的部落格
歡迎訪問我的部落格 https://www.cnblogs.com/liqiju/