一、配置准备
通过Maven工程,在eclipse中整合SSM,并在Tomcat服务器上运行
在进行配置前,先理清楚要配置哪些文件,如图,除web.xml外,其余三个配置文件名称均可自定义:
如图所示,一共有四个需要手动配置的文件:
1、web.xml:配置servlet、filter、listener
2、applicationContext.xml:配置相关的bean,与mybatis整合
3、Spring-Servlet.xml:用于配置视图解析器、控制器等
4、GenratorConfig.xml:用于生成Mybatis用到的实体类、Mapper接口、Map配置文件
新建一个Maven工程,工程结构如图:
二、配置过程
大致了解所需配置文件后,开始配置
1、Web.xml
配置前首先导入依赖包
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>ssmgroupId>
<artifactId>ssmartifactId>
<packaging>warpackaging>
<version>0.0.1-SNAPSHOTversion>
<name>ssm Maven Webappname>
<url>http://maven.apache.orgurl>
<properties>
<spring.version>5.0.0.RELEASEspring.version>
<mybatis.version>3.4.5mybatis.version>
<slf4j.version>1.7.25slf4j.version>
<log4j.version>1.2.17log4j.version>
properties>
<dependencies>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.11version>
<scope>testscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-coreartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-oxmartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-txartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webmvcartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-aopartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-context-supportartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-testartifactId>
<version>${spring.version}version>
<scope>testscope>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>${mybatis.version}version>
dependency>
<dependency>
<groupId>com.github.pagehelpergroupId>
<artifactId>pagehelperartifactId>
<version>4.1.6version>
dependency>
<dependency>
<groupId>tk.mybatisgroupId>
<artifactId>mapperartifactId>
<version>3.3.8version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatis-springartifactId>
<version>1.3.1version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>8.0.13version>
dependency>
<dependency>
<groupId>commons-dbcpgroupId>
<artifactId>commons-dbcpartifactId>
<version>1.4version>
dependency>
dependencies>
<build>
<finalName>ssmfinalName>
<plugins>
<plugin>
<groupId>org.mybatis.generatorgroupId>
<artifactId>mybatis-generator-maven-pluginartifactId>
<version>1.3.2version>
<configuration>
<configurationFile>
src/main/resources/generatorConfig.xml
configurationFile>
<verbose>trueverbose>
<overwrite>trueoverwrite>
configuration>
<dependencies>
<dependency>
<groupId>org.mybatis.generatorgroupId>
<artifactId>mybatis-generator-coreartifactId>
<version>1.3.2version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>8.0.13version>
dependency>
dependencies>
plugin>
plugins>
build>
project>
spring mvc采用前置控制器的设计模式,由一个DispatcherServlet负责分派,因此要在web.xml中对这个Servlet进行配置,该Servlet在启动时便实例化,因此要配置load-on-startup属性,我们先了解一下Spring MVC中的Context Hierarchy,首先看一张来自官网的图
WebApplicationContext是ApplicationContext的拓展,是用于生成Bean的工厂,每个DispatcherServlet都需要一个Servlet WebApplicationContext来进行自己的配置,多个DispatcherServlet共享一个Root WebApplicationContext的配置,通常,在Servlet WebApplicationContext中配置控制器、视图解析器,在Root WebApplicationContext配置需要被多个Servlet共享的业务逻辑以及数据访问的Bean。
每个DispatcherServlet对应的Servlet WebApplicationContext,默认名称为[servlet-name]-servlet,如本例中web.xml中配置servlet-name为spring,那么默认的Servlet WebApplicationContext配置文件名称便为spring-servlet,其默认路径在WEB-INF下,当然,也可以通过在Servlet中配置init-param的contextConfigLocation来自定义配置路径以及配置名称,本例中不进行配置,采用默认的名称 spring-servlet
对于Root WebApplicationContext的配置,首先要在web.xml中通过
DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<context-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:applicationContext.xmlparam-value>
context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
listener>
<servlet>
<servlet-name>springservlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
servlet-class>
<load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
<servlet-name>springservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>
web-app>
2、spring-servlet.xml配置
在该配置文件中,主要配置控制器与视图解析器,配置过程比较简单,先在工程中新建一个实现控制器的包,这里定义为ssm.controller,随后配置一个视图解析器的bean以及扫描控制器注解,配置完毕后如图所示
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
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:annotation-config/>
<context:component-scan base-package="ssm.controller">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
context:component-scan>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
bean>
beans>
3、generatorConfig.xml配置
要在applicationContext.xml中整合spring与mybatis,至少要配置两样东西:一个 SqlSessionFactory 和至少一个数据映射器类,因此,我们要先通过generatorConfig.xml,帮助我们自动生成实体对象、Mapper接口,以及对应的Mapper.xml文件。generatorConfig.xml的路径由pom.xml中configurationFile指定
在这个配置文件中:
jdbcConnection指定数据连接
javaModelGenerator指定要生成的实体对象的位置,
sqlMapGenerator指定要生成的Map.xml文件的位置
javaClientGenerator指定要生成的Mapper接口的位置
table指定要生成的表,通过enable**ByExample属性,指定是否要生成example文件
我们指定生成的数据表如下:
最终配置文件如图
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>
<context id="test" defaultModelType="flat">
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
commentGenerator>
<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:3306/test?autoReconnect=true&utoReconnectForPools=true&
useUnicode=true&characterEncoding=utf-8&useSSL=false&
serverTimezone=UTC"
userId="root" password="wqk123">
jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
javaTypeResolver>
<javaModelGenerator targetPackage="com.entity" targetProject="src/main/java">
javaModelGenerator>
<sqlMapGenerator targetPackage="map" targetProject="src/main/resources">
<property name="enableSubPackages" value="true"/>
sqlMapGenerator>
<javaClientGenerator targetPackage="com.map" type="XMLMAPPER" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
javaClientGenerator>
<table tableName="food_item" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false"
enableSelectByExample="false" selectByExampleQueryId="false">
<generatedKey column="food_id" sqlStatement="MySql" identity="true"/>
table>
context>
generatorConfiguration>
配置完毕后,在项目上指定maven build,并设置Goals为mybatis-generator:generate -X,随后自动生成相应文件如图
4、配置applicationContext.xml
在配置generatorConfig.xml时提到了,如果要想在applicationContext.xml中实现Mybatis与spring的整合,那么至少需要配置两样东西:一个 SqlSessionFactory 和至少一个数据映射器类,此外,在applicationContext.xml中还要扫描实现业务逻辑的service包并配置数据库链接源
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:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://127.0.0.1:3306/test?autoReconnect=true&utoReconnectForPools=true&
useUnicode=true&characterEncoding=utf-8&useSSL=false&
serverTimezone=UTC"/>
<property name="username" value="root"/>
<property name="password" value="wqk123"/>
bean>
<bean id="SqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="typeAliasesPackage" value="com.entity"/>
<property name="mapperLocations" value="classpath:map/FoodItemMapper.xml"/>
bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.map"/>
<property name="sqlSessionFactoryBeanName" >
<idref bean="SqlSessionFactory"/>
property>
bean>
<context:component-scan base-package="com.service"/>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
beans>
至此,配置以及完成
三、验证配置
实现一个简单的功能,通过id参数读取相应食品的名称以及描述
1、定义业务逻辑的service接口并实现
2、定义控制器并实现
3、测试实际效果