前文啰嗦:
之前一直使用SpringBoot ,有好一段时间没去一步步整合SSM框架去做项目了,最近有小伙伴在我其他博客的留言,让我感觉到初学者虽然简单学会SpringBoot,确实能快速上手开发项目,但是可能会因为SpringBoot省掉了很多配置导致自己从来没见过SSM里面都有些什么配置,这样其实是比较不好的。 所以,我决定写一篇 SSM Spring+SpringMVC+Mybatis三大框架的整合实战教程。
开始,先看看我们的最终完成的项目目录结构:
在开始实战整合前,先简单介绍下,目录结果里面的各种配置文件(初学者最怕的无非也就是配置配置配置了,所以SpringBoot遵循习惯优于配置,直接帮忙弄了很多默认配置,让咱们IT搬砖民工沉迷于此无法自拔)
小白文简单讲讲:
web.xml 因为我们做的是一个web项目,这个web.xml是项目一跑起来,我们回去优先加载读取的一个配置文件。也就是说,项目是从它开始入手的,所以一会可以看到这个配置文件里面会有这么一行(加载applicationContext.xml):
<param-value> classpath:spring/applicationContext.xml</param-value>
applicationContext.xml 可以看到我们项目是三大框架的整合,既然是Spring+SpringMVC+Mybatis,那总得有个东西把三大框架整合关联起来吧? 没错,你就这么理解这个applicationContext.xml就是这一条关联的绳子(可以想想其重要性,这是一个基本杂七杂八的配置都在里面过一过那种),我们先瞄一样里面的这几行:
<value>classpath:jdbc.properties</value>
<property name="configLocation" value="classpath:mybatis.xml" /> <property name="mapperLocations" value="classpath:sqlmap/*Mapper.xml"/>
mybatis.xml 这个配置文件就是针对mybatis框架的。
generator.properties 和 generatorConfig.xml 这两个配置文件不是必须有的,因为这是用于逆向工程的。(不了解不要紧,一会咱们一起用下,你就知道用起来多舒服了。PS:逆向工程,根据数据表直接生成对接数据库层面需要的代码类,包括实体类、Mapper接口、MapperXML sql语句等)
jdbc.properties 这个配置文件里面就是一些连接数据库需要用到的信息(用户名、密码、连接host等等)
log4j.properties 这个配置文件是针对日志打印的。
好了,配置文件大致我们都认识了下,那么我们接下来整合就快很多了,因为现在其实已经知道这个项目大概内容是做啥了。
PS: 千万不要嫌我啰嗦,我这个是真的从零教大家整合,所以会显得比较啰嗦。
开始,首先
空空如也的我们先建一个MAVEN项目,
groupid:我填的 com.springmvc (需要跟后面自己手动建文件夹对应起来)
然后把以下目录结构准备好(因为你建完MAVEN项目,有可能只有个src文件夹和一个webapp文件夹),就是建文件夹以及一些配置文件:
ps:
让一个文件夹带上‘三个横杠’,对着文件夹,鼠标右键,找到make directory as,选择Resources root
让一个文件夹变成蓝色,对着文件夹,鼠标右键,找到 make directory as,选择Sources root
需要用到的文件我们都建完了,那么开始,我们先从依赖包入手,没有依赖包,怎么使用这些框架技术呢,pom.xml文件:
<?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.springmvc</groupId> <artifactId>elegantjc</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>elegantjc 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>1.7</maven.compiler.source> <maven.compiler.target>1.7</maven.compiler.target> <!-- spring版本号 --> <spring.version>4.2.5.RELEASE</spring.version> <!-- mybatis版本号 --> <mybatis.version>3.2.4</mybatis.version> <!-- log4j日志文件管理包版本 --> <slf4j.version>1.6.6</slf4j.version> <log4j.version>1.2.12</log4j.version> </properties> <dependencies> <!-- spring核心包 --> <!-- springframe start --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-oxm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <!-- springframe end --> <!-- mybatis核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <!-- mybatis/spring包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <!-- mybatis-generator-core 反向生成java代码--> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.3.5</version> </dependency> <!-- mysql驱动包 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.29</version> </dependency> <!-- junit测试包 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <!-- jstl --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2.1-b03</version> <scope>provided</scope> </dependency> <!-- servlet --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> <!-- json数据 --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.7.1</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.7.1</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.7.1</version> </dependency> <dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.4</version> <classifier>jdk15</classifier> </dependency> <!-- commons --> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>commons-pool</groupId> <artifactId>commons-pool</artifactId> <version>1.5.6</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>commons-beanutils</groupId> <artifactId>commons-beanutils</artifactId> <version>1.8.3</version> </dependency> <dependency> <groupId>commons-httpclient</groupId> <artifactId>commons-httpclient</artifactId> <version>3.1</version> </dependency> <dependency> <groupId>commons-collections</groupId> <artifactId>commons-collections</artifactId> <version>3.1</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.9</version> </dependency> <dependency> <groupId>javax.annotation</groupId> <artifactId>jsr250-api</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>net.sf.ezmorph</groupId> <artifactId>ezmorph</artifactId> <version>1.0.6</version> </dependency> <dependency> <groupId>javax.activation</groupId> <artifactId>activation</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!-- 日志文件管理包 --> <!-- log start --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> </dependency> <!--上传--> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <!-- log end --> </dependencies> <build> <finalName>elegantjc</finalName> <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --> <plugins> <plugin> <artifactId>maven-clean-plugin</artifactId> <version>3.1.0</version> </plugin> <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --> <plugin> <artifactId>maven-resources-plugin</artifactId> <version>3.0.2</version> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.0</version> </plugin> <plugin> <artifactId>maven-surefire-plugin</artifactId> <version>2.22.1</version> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>3.2.2</version> </plugin> <plugin> <artifactId>maven-install-plugin</artifactId> <version>2.5.2</version> </plugin> <plugin> <artifactId>maven-deploy-plugin</artifactId> <version>2.8.2</version> </plugin> </plugins> </pluginManagement> <plugins> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <configuration> <!--允许移动生成的文件--> <verbose>true</verbose> <!--允许覆盖生成的文件--> <overwrite>true</overwrite> </configuration> </plugin> </plugins> </build> </project>
然后jdbc.properties:
driver=com.mysql.jdbc.Driver #game_message为我本地的数据库名 url=jdbc:mysql://localhost:3306/game_message?useUnicode=true&characterEncoding=utf-8 username=root #下面输入自己数据库的密码 password=root #定义初始连接数 initialSize=0 #定义最大连接数 maxActive=20 #定义最大空闲 maxIdle=20 #定义最小空闲 minIdle=1 #定义最长等待时间 maxWait=60000
然后log4j.properties:
#log4j.rootLogger=debug,console,debug,info,warn,error,fatal log4j.rootLogger=INFO,info,warn,error,fatal log4j.appender.console=org.apache.log4j.ConsoleAppender log4j.appender.console.layout=org.apache.log4j.PatternLayout log4j.appender.console.Encoding=UTF-8 log4j.appender.console.layout.ConversionPattern= %p %d{MM-dd_HH:mm:ss} %F %L %m %n #log4j.logger.java.sql.ResultSet=INFO #log4j.logger.org.apache=INFO #log4j.logger.java.sql.Connection=INFO #log4j.logger.java.sql.Statement=DEBUG log4j.logger.java.sql.ResultSet=INFO log4j.logger.org.apache=INFO log4j.logger.java.sql.Connection=DEBUG log4j.logger.java.sql.Statement=DEBUG log4j.logger.java.sql.PreparedStatement=DEBUG log4j.logger.org.springframework=ERROR log4j.logger.org.mybatis=ERROR log4j.logger.org.hibernate=ERROR log4j.logger.com.mchange=ERROR log4j.logger.org.quartz=ERROR log4j.logger.debug=debug log4j.appender.debug=org.apache.log4j.DailyRollingFileAppender log4j.appender.debug.layout=org.apache.log4j.PatternLayout log4j.appender.debug.layout.ConversionPattern= %p %d{MM-dd_HH:mm:ss} %F %L %m %n log4j.appender.debug.datePattern='.'yyyy-MM-dd-HH log4j.appender.debug.Threshold=DEBUG log4j.appender.debug.append=true log4j.appender.debug.Encoding=UTF-8 log4j.appender.debug.File=${loghome}/mall_debug.log log4j.logger.info=info log4j.appender.info=org.apache.log4j.DailyRollingFileAppender log4j.appender.info.layout=org.apache.log4j.PatternLayout log4j.appender.info.layout.ConversionPattern= %p %d{MM-dd_HH:mm:ss} %F %L %m %n log4j.appender.info.datePattern='.'yyyy-MM-dd-HH log4j.appender.info.Threshold=INFO log4j.appender.info.append=true log4j.appender.info.Encoding=UTF-8 log4j.appender.info.File=${loghome}/mall_info.log log4j.logger.warn=warn log4j.appender.warn=org.apache.log4j.DailyRollingFileAppender log4j.appender.warn.layout=org.apache.log4j.PatternLayout log4j.appender.warn.layout.ConversionPattern= %p %d{MM-dd_HH:mm:ss} %F %L %m %n log4j.appender.warn.datePattern='.'yyyy-MM-dd-HH log4j.appender.warn.Threshold=WARN log4j.appender.warn.append=true log4j.appender.warn.Encoding=UTF-8 log4j.appender.warn.File=${loghome}/mall_warn.log log4j.logger.error=error log4j.appender.error=org.apache.log4j.DailyRollingFileAppender log4j.appender.error.layout=org.apache.log4j.PatternLayout log4j.appender.error.layout.ConversionPattern= %p %d{MM-dd_HH:mm:ss} %F %L %m %n log4j.appender.error.datePattern='.'yyyy-MM-dd-HH log4j.appender.error.Threshold=ERROR log4j.appender.error.append=true log4j.appender.error.Encoding=UTF-8 log4j.appender.error.File=${loghome}/mall_error.log log4j.logger.fatal=fatal log4j.appender.fatal=org.apache.log4j.DailyRollingFileAppender log4j.appender.fatal.layout=org.apache.log4j.PatternLayout log4j.appender.fatal.layout.ConversionPattern= %p %d{MM-dd_HH:mm:ss} %F %L %m %n log4j.appender.fatal.datePattern='.'yyyy-MM-dd-HH log4j.appender.fatal.Threshold=FATAL log4j.appender.fatal.append=true log4j.appender.fatal.Encoding=UTF-8 log4j.appender.fatal.File=${loghome}/mall_fatal.log #The log output to the directory #loghome=/log/tomcat/zqgameapi_logs #loghome=/data/logs/tomcat/admin.gamelaoyou.com loghome=F:\\log_data
mybatis.xml:
<?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> <settings> <setting name="cacheEnabled" value="false" /> <setting name="useGeneratedKeys" value="true" /> <setting name="defaultExecutorType" value="REUSE" /> <!-- 打印MYSQL语句 --> <setting name="logImpl" value="STDOUT_LOGGING" /> </settings> </configuration>
applicationContext.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:beans="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd" > <!-- ①:对com.springmvc包中的所有类进行扫描,以完成Bean创建和自动依赖注入的功能 --> <context:component-scan base-package="com.springmvc"/> <mvc:annotation-driven /> <!-- 静态资源访问 --> <!--如果webapp下你新建了文件夹,想访问里面的静态资源,那么就要在这配置一下--> <mvc:resources location="/images/" mapping="/images/**"/> <mvc:resources location="/css/" mapping="/css/**"/> <mvc:resources location="/styles/" mapping="/styles/**"/> <mvc:resources location="/js/" mapping="/js/**"/> <!-- Configures the @Controller programming model <mvc:annotation-driven />--> <!-- ②:启动Spring MVC的注解功能,完成请求和注解POJO的映射 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <ref bean="mappingJacksonHttpMessageConverter"/> </list> </property> </bean> <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>application/json;charset=UTF-8</value> </list> </property> </bean> <!-- 配置会话工厂SqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 数据源 --> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:mybatis.xml" /> <property name="mapperLocations" value="classpath:sqlmap/*Mapper.xml"/> <property name="typeAliasesPackage" value="com.springmvc.entity" /> </bean> <!-- 在spring容器中配置mapper的扫描器产生的动态代理对象在spring的容器中自动注册,bean的id就是mapper类名(首字母小写)--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 指定扫描包的路径,就是mapper接口的路径,多个包中间以 半角逗号隔开 --> <property name="basePackage" value="com.springmvc.dao"/> <!-- 配置sqlSessionFactoryBeanName --> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> </bean> <!-- 配置视图解析器,把控制器的逻辑视频映射为真正的视图 --> <!-- /WEB-INF/jsp/start.jsp --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <property name="prefix" value="/WEB-INF/views/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 配置dbcp数据库连接池 --> <!-- <context:property-placeholder location="classpath:db.properties"/> --> <!--数据库配置 --> <bean id = "propertyConfigurer" class = "org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:jdbc.properties</value> </list> </property> </bean> <!-- 数据库连接池 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${driver}"/> <property name="url" value="${url}"/> <property name="username" value="${username}"/> <property name="password" value="${password}"/> <property name="initialSize" value="1"/> <property name="maxActive" value="100"/> <property name="maxIdle" value="5"/> <property name="maxWait" value="80000"/> </bean> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 拦截器 --> <mvc:interceptors> <!-- 国际化操作拦截器 如果采用基于(请求/Session/Cookie)则必需配置 --> <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" /> </mvc:interceptors> <!-- 定义无Controller的path<->view直接映射 --> <!-- <mvc:view-controller path="/" view-name="redirect:/" /> --> </beans>
web.xml:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>elegantjc</display-name> <!-- 配置编码方式--> <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> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 配置springmvc的前端控制器 指向spring-mvc.xml 程序在启动的时候就加载springmvc 可以接受所有请求 load-on-startup:表示启动容器时初始化该Servlet; --> <servlet> <servlet-name>springServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 可以自定义servlet.xml配置文件的位置和名称, 默认为WEB-INF目录下,名称为[<servlet-name>]-servlet.xml,如spring-servlet.xml --> <init-param> <param-name>contextConfigLocation</param-name> <param-value> classpath:spring/applicationContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- 将前端URL请求和后台处理方法controller建立对应关系--> <servlet-mapping> <servlet-name>springServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- Spring配置 --> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <!-- 取消对某一类文件的拦截--> <servlet-mapping> <servlet-name>default</servlet-name> <url-pattern>*.md</url-pattern> </servlet-mapping> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath:spring/applicationContext.xml</param-value> </context-param> <!-- 欢迎页面--> <welcome-file-list> <welcome-file>/WEB-INF/index.jsp</welcome-file> </welcome-file-list> <!--404错误展示页面,可自行配置--> <!--<error-page>--> <!--<error-code>404</error-code>--> <!--<location>/WEB-INF/views/404.jsp</location>--> <!--</error-page>--> <!--设置session失效时间为30分钟 --> <session-config> <session-timeout>600</session-timeout> </session-config> </web-app>
generator.properties:
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/game_message?useUnicode=true&characterEncoding=utf-8 username=root password=root #entity 包名和 java目录 modelPackage=com.springmvc.entity modelProject=src/main/java #sqlmap包名 和resources目录 sqlPackage=sqlmap sqlProject=src/main/resources #mapper包名和 java目录 mapperPackage=com.springmvc.dao mapperProject=src/main/java #数据库需要自动逆向生成的表的名字 table=messageboard
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> <!--导入属性配置 --> <properties resource="generator.properties"/> <classPathEntry location="C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.29\mysql-connector-java-5.1.29.jar" /> <context id="context1"> <!-- 注释 --> <commentGenerator> <property name="suppressAllComments" value="true" /><!-- 是否取消注释 --> <property name="suppressDate" value="true" /> <!-- 是否生成注释代时间戳 --> </commentGenerator> <jdbcConnection driverClass="${driver}" connectionURL="${url}" userId="${username}" password="${password}" /> <!-- 类型转换 --> <javaTypeResolver> <!-- 是否使用bigDecimal, false可自动转化以下类型(Long, Integer, Short, etc.) --> <property name="forceBigDecimals" value="false" /> </javaTypeResolver> <javaModelGenerator targetPackage="${modelPackage}" targetProject="${modelProject}" /> <sqlMapGenerator targetPackage="${sqlPackage}" targetProject="${sqlProject}" /> <javaClientGenerator targetPackage="${mapperPackage}" targetProject="${mapperProject}" type="XMLMAPPER" /> <!-- 如果需要通配所有表 直接用sql的通配符 %即可 --> <table schema="" tableName="${table}" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"/> </context> </generatorConfiguration>
到这里,我们其实已经整合完毕了,这时候你需要做的是,先别急着往下看,先回过头看看配置文件里面的注释,了解一下各项配置的作用。
继续,我们现在开始在数据简单建一张表,名字叫messageboard:
表建完了,我们开始打开IDEA右侧的maven模块,找到mybatis-generator,双击它进
行逆向工程的生成:
看到控制台出现了 BUILD SUCCESS ,那么你可以看到你的项目,多了三个文件,可以点开看看,增删改查基本都帮你自动生成了(搬砖必备):
好了,那么我们接下来添加service层和controller层代码,这样就是controller->service->dao->entity 四层结构:
MessageBoardService.java:
package com.springmvc.service; import com.springmvc.entity.Messageboard; /** * @Author : JCccc * @CreateTime : 2019/7/31 * @Description : **/ public interface MessageboardService { int insert(Messageboard record); }
MessageBoardServiceImpl.java:
package com.springmvc.service.impl; import com.springmvc.dao.MessageboardMapper; import com.springmvc.entity.Messageboard; import com.springmvc.service.MessageboardService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; /** * @Author : JCccc * @CreateTime : 2019/7/31 * @Description : **/ @Service public class MessageboardServiceImpl implements MessageboardService { @Autowired MessageboardMapper messageboardMapper; @Override public int insert(Messageboard record) { return messageboardMapper.insert(record); } }
然后是controller层:
MessageboardController.java:
package com.springmvc.controller; import com.springmvc.entity.Messageboard; import com.springmvc.service.MessageboardService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * @Author : JCccc * @CreateTime : 2019/7/31 * @Description : **/ @RestController public class MessageboardController { @Autowired MessageboardService messageboardServiceImpl; @RequestMapping(value = "/addMessageBoardData",produces = "application/json; charset=utf-8") public String addMessageBoardData() { Messageboard messageboard =new Messageboard(); messageboard.setUsername("测试添加"); messageboard.setMessage("哇,SSM整合这么简单"); int effectNum = messageboardServiceImpl.insert(messageboard); int id=messageboard.getId(); System.out.println(); return "影响行数:"+effectNum+" 返回主键id:"+id; } }
可以看到我这个接口里面,调用的方法是插入方法。
那么我们将项目跑起来(配置下tomcat),最后用Postman去调这个接口测试下:
看下控制台:
看下数据库表数据:
好了,到这里,这篇教程就真的到此结束了,希望你能收获到些什么(PS: 不用自动生成,自己去手写mapper、mapper.xml、pojo都是非常正常的,喜欢自己建的完全可以自己建,喜欢自动生成的就可以用自动生成)。