SSM整合
文章目录
-
- 思路梳理
- dao-mybatis
- service
- spring-mvc
思路梳理
当我们使用SSM项目开发一个项目时
- 需求分析
- 数据库设计
- 后端业务逻辑实现
第三步,才需要使用SSM框架
pom.xml
<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>4.0.0modelVersion>
<groupId>com.yygroupId>
<artifactId>SSM_learningartifactId>
<version>1.0-SNAPSHOTversion>
<dependencies>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.47version>
dependency>
<dependency>
<groupId>com.mchangegroupId>
<artifactId>c3p0artifactId>
<version>0.9.5.2version>
dependency>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>servlet-apiartifactId>
<version>2.5version>
dependency>
<dependency>
<groupId>javax.servlet.jspgroupId>
<artifactId>jsp-apiartifactId>
<version>2.2version>
dependency>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>jstlartifactId>
<version>1.2version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>3.5.2version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatis-springartifactId>
<version>2.0.2version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webmvcartifactId>
<version>5.1.9.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>5.1.9.RELEASEversion>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<version>1.16.18version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>fastjsonartifactId>
<version>1.2.70version>
dependency>
dependencies>
<build>
<resources>
<resource>
<directory>src/main/javadirectory>
<includes>
<include>**/*.propertiesinclude>
<include>**/*.xmlinclude>
includes>
<filtering>falsefiltering>
resource>
<resource>
<directory>src/main/resourcesdirectory>
<includes>
<include>**/*.propertiesinclude>
<include>**/*.xmlinclude>
includes>
<filtering>falsefiltering>
resource>
resources>
build>
project>
dao-mybatis
-
实现dao层 ----- 数据库交互
首先要实现dao层，dao层是操作数据库的层，我们使用Mybatis框架帮助操作数据库！
（Mybatis可以帮我们完成从一个dao层接口和sql语句，得到一个实现类实现接口执行sql语句的过程！）
因为SSM整合，最终我们所有的类都需要从Spring中得到。
所以我们要将用Mybatis动态生成的实现了dao层接口的类注册到Spring中。完成了dao层接口实现类的SpringBean注册，bean名字为接口名 + SpringBean命名规则：
1、如果类第一个字母大写第二个小写，那么首字母小写获取bean
2、如果第一个和第二个字母都是大写的，那个获取bean首字母要大写mybatis-config.xml
<configuration> <typeAliases> <package name="com.yy.pojo"/> typeAliases> <mappers> <package name="com.yy.dao"/> mappers> configuration>spring-dao.xml
<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 http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <context:property-placeholder location="classpath:database.properties">context:property-placeholder> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}">property> <property name="jdbcUrl" value="${jdbc.url}">property> <property name="user" value="${jdbc.username}">property> <property name="password" value="${jdbc.password}">property> bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource">property> <property name="configLocation" value="classpath:mybatis-config.xml">property> bean> 此处重点！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！ <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <property name="basePackage" value="com.yy.dao"/> bean> beans>
service
-
service层
完成了第一步，我们已经可以在Spring中通过context.getBean("IBookMapper");来获取dao层的每个接口的实现类对象了。接下来配置Service层：
spring-service.xml
<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 http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.yy.service">context:component-scan> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> bean> beans>
spring-mvc
-
SpringMVC整合
完成了第二步，我们已经可以在Spring中通过context.getBean("bookService");来获取service层的业务实现类对象了。
首先为项目添加web依赖，生成web相关文件。
在web.xml中配置DispatcherServlet ：使前端的请求可以流入DispatcherServlet。
并配置乱码处理过滤器，session等web相关配置web.xml
<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"> <servlet> <servlet-name>springmvcservlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class> <init-param> <param-name>contextConfigLocationparam-name> <param-value>classpath:spring-mvc.xmlparam-value> init-param> <load-on-startup>1load-on-startup> servlet> <servlet-mapping> <servlet-name>springmvcservlet-name> <url-pattern>/url-pattern> servlet-mapping> <filter> <filter-name>encodingFilterfilter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class> <init-param> <param-name>encodingparam-name> <param-value>utf-8param-value> init-param> filter> <filter-mapping> <filter-name>encodingFilterfilter-name> <url-pattern>/*url-pattern> filter-mapping> <session-config> <session-timeout>15session-timeout> session-config> web-app>web.xml中需要引入DispatcherServlet(springmvc)的配置
spring-mvc.xml
<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 https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <mvc:annotation-driven> <mvc:message-converters register-defaults="true"> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8"/> bean> mvc:message-converters> mvc:annotation-driven> <mvc:default-servlet-handler/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> bean> <context:component-scan base-package="com.yy.controller" /> <import resource="spring-service.xml">import> <import resource="spring-dao.xml">import> beans> -
此时前端的请求流入DispatcherServlet,还需要再spring-mvc配置文件中引入dao和service层的配置文件，才可以通过MVC调用Service层的Bean。
再spring-mvc配置文件中加上两句：<import resource="spring-service.xml">import> <import resource="spring-dao.xml">import>