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SSM 整合
2022-07-07 05:23:00 【熙攘。】
SSM框架，即Spring+SpringMVC+Mybatis，由Spring、MyBatis两个开源框架整合而成（SpringMVC是Spring的部分内容）。至此我对SSM的学习告一段落。
注意事项：
如果Mybatis中的mapper.xml与Mapper接口同名且分别在java目录和resources目录的同名包下，那么spring扫描Mapper接口的同时会自动扫描同名的Mapper.xml并装配；
如果Mapper.xml与Mapper接口不同名或者不在同名包下,就必须在applicationContext.xml中配置sessionFactory的mapperLocations属性来指定mapper.xml的位置,此时spring通过识别mapper.xml的namespace来确定对应的Mapper接口。
利用Maven构建完整的SSM项目
一、导入坐标至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>org.example</groupId>
<artifactId>finalSSM</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<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>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.1</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.5</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.8</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.0</version>
</dependency>
<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>2.3</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.2.0</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
<build>
<finalName>finalSSM</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>
</build>
</project>
二、 数据库
目标数据库中的account表：
三、实体类
set方法便于Spring注入
package Domain;
/*
实体类
*/
public class Account {
private int id;
private String name;
private int money;
public int getId() {
return id;
}
public Account setId(int id) {
this.id = id;
return this;
}
public String getName() {
return name;
}
public Account setName(String name) {
this.name = name;
return this;
}
public int getMoney() {
return money;
}
public Account setMoney(int money) {
this.money = money;
return this;
}
@Override
public String toString() {
return "account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
四、Mapper接口
尽量与mapper.xml同名且在同名包下
package Mapper;
import Domain.Account;
import java.util.List;
/*
mapper接口
*/
public interface AccountMapper {
public void save(Account user);
public List<Account> findAll();
}
五、Service
主要为后端与数据库的交互
接口：
package Service;
import Domain.Account;
import java.io.IOException;
import java.util.List;
public interface AccountService {
public void save(Account user) throws IOException;
public List<Account> findAll() throws IOException;
}
实现：
package Service.Impl;
import Domain.Account;
import Mapper.AccountMapper;
import Service.AccountService;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/*
后端与数据库交互
*/
@Service("accountService")
public class serviceImpl implements AccountService {
@Autowired
private AccountMapper accountMapper;
@Override
public void save(Account user) throws IOException {
//传统Mybatis方法
/*InputStream resourceAsStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
AccountMapper mapper = sqlSession.getMapper(AccountMapper.class);
mapper.save(user);
sqlSession.commit();
sqlSession.close();*/
//整合方法
accountMapper.save(user);
}
@Override
public List<Account> findAll() throws IOException {
//Mybatis方法
/*InputStream resourceAsStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
AccountMapper mapper = sqlSession.getMapper(AccountMapper.class);
List<Account> list = mapper.findAll();
sqlSession.commit();
sqlSession.close();
return list;*/
//整合方法
return accountMapper.findAll();
}
}
六、Control
主要为SpringMVC的前端控制
package Control;
import Domain.Account;
import Service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import java.io.IOException;
/*
前端控制
*/
@Controller
public class controller {
@Autowired
private AccountService accountService;//指向serviceImpl
@RequestMapping( "/save")
@ResponseBody
public String save(Account a) throws IOException {
accountService.save(a);
return "success";
}
@RequestMapping("/findAll")
public ModelAndView findAll() throws IOException {
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("accountList",accountService.findAll());
modelAndView.setViewName("accountList");
return modelAndView;
}
}
七、Spring配置文件
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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!--Spring-->
<!--组件扫描 注解相关-->
<context:component-scan base-package="Service"/>
<context:component-scan base-package="Mapper"/>
<!--整合Mybatis，将Session创建与事务管理交由Spring控制-->
<!--加载propeties文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--配置数据源信息-->
<bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${driverClass}"/>
<property name="url" value="${url}"/>
<property name="username" value="${user}"/>
<property name="password" value="${password}"/>
</bean>
<!--配置sessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--数据源-->
<property name="dataSource" ref="dataSource"></property>
<!--别名-->
<property name="typeAliasesPackage" value="Domain"/>
<!--扫描mapper.xml-->
<property name="mapperLocations" value="classpath*:Mapper/*.xml"/>
<!--加载Mybatis配置文件-->
<!--<property name="configLocation" value="classpath:SqlMapConfig-spring.xml"></property>-->
</bean>
<!--实例化mapper-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--value为xml文件所在包-->
<property name="basePackage" value="Mapper"/>
</bean>
<!--注意：
1.配置sessionFactory时，除数据源外的其他属性可在Mybatis配置文件中设置，但要加载Mybatis配置文件:
2.如果Mapper.xml与Mapper.class在同一个包下且同名，spring扫描Mapper.class的同时
会自动扫描同名的Mapper.xml并装配到Mapper.class;如果Mapper.xml与Mapper.class
不在同一个包下或者不同名,就必须配置属性mapperLocations来指定mapper.xml的位置,此时
spring通过识别mapper.xml的namespace来确定对应的Mapper.class。
-->
<!--声明式事务控制-->
<!--平台事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!--配置事务增强-->
<tx:advice id="txAdvice">
<tx:attributes>
<tx:method name="*"/>
</tx:attributes>
</tx:advice>
<!--事务的aop织入-->
<aop:config>
<aop:advisor advice-ref="txAdvice" pointcut="execution(* Service.Impl.*.*(..))"/>
</aop:config>
</beans>八、SpringMVC配置文件
spring-mvc.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 http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--mvc注解驱动-->
<mvc:annotation-driven>
<!-- 转换字符编码，springmvc默认为ISO-8859-1 -->
<mvc:message-converters>
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="#{T(java.nio.charset.Charset).forName('UTF-8')}"/>
<property name="supportedMediaTypes">
<list>
<value>text/plain;charset=UTF-8</value>
<value>text/html;charset=UTF-8</value>
<value>applicaiton/javascript;charset=UTF-8</value>
</list>
</property>
<property name="writeAcceptCharset"><value>false</value></property>
</bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>application/json; charset=UTF-8</value>
<value>application/x-www-form-urlencoded; charset=UTF-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!-- controller前端控制器扫描 -->
<context:component-scan base-package="Control">
<!-- 扫描带有Controller注解的类 -->
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--内部资源视图解析器-->
<bean id="resourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!--开放静态资源访问权限-->
<mvc:default-servlet-handler></mvc:default-servlet-handler>
<!-- 配置文件上传解析器 -->
<!--<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!–字符集–>
<property name="defaultEncoding" value="UTF-8"/>
<!–文件大小/bit–>
<property name="maxUploadSize" value="500000"/>
</bean>-->
<!-- 配置拦截器 -->
<!--<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/IV"/>
<bean class=""/>
</mvc:interceptor>
</mvc:interceptors>-->
<!-- 配置异常处理器 -->
<!--<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="defaultErrorView" value="/error.jsp"/>
<property name="exceptionMappings">
<map>
<entry key="java.lang.ClassCastException" value="/error.jsp"/>
<entry key="V_异常处理.异常.自定义异常" value="/error.jsp"/>
</map>
</property>
</bean>-->
<!--通过HandlerAdapter配置映射器，可用<mvc:annotation-driven>代替-->
<!--<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
</list>
</property>
</bean>-->
</beans>九、Mybatis配置文件
Mapper/AccountMapper.xml：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="Mapper.AccountMapper">
<!-- 编写映射文件 -->
<!--保存-->
<select id="save" parameterType="account">
insert into account value (#{id},#{name},#{money})
</select>
<!--查询-->
<select id="findAll" resultType="account">
select * from account
</select>
</mapper>SqlMapConfig.xml:
经整合可省去。
十、其他配置文件
jdbc.properties
log4j.properties
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