SSM整合（Spring+SpringMVC+Mybatis）

IDEA创建一个webapp工程

选择骨架创建

1、Spring整合Mybatis

• 让Spring容器去管理SqlSessionFactory对象
• 让Spring容器去创建并管理Mapper接口代理对象
• 让Mybatis用上Spring的声明式事务

1.1 实现Mybatis的代码

pom.xml文件中导入依赖

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.2</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.7</version>
</dependency>
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.22</version>
    <scope>provided</scope>
</dependency>

编写数据库表

创建pojo包、mapper包、mapper.xml文件，可以用mybatis逆向工程

创建jdbc.properties

目录结构：

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?useSSL=false&serverTimezone=GMT%2B8&characterEncoding=utf8&useUnicode=true
jdbc.username=root
jdbc.password=123456
jdbc.initialSize=5
jdbc.minIdle=5
jdbc.maxActive=20
jdbc.maxWait=60000

创建log4j.properties

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=my.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.rootLogger=debug, stdout, file

配置mybatis环境 mybatis-config.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>
    <!-- 配置properties-->
    <properties resource="jdbc.properties"></properties>
    <!--配置环境-->
    <environments default="mysql">
        <!-- 配置mysql的环境-->
        <environment id="mysql">
            <!-- 配置事务 -->
            <transactionManager type="JDBC"></transactionManager>
            <!--配置连接池-->
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"></property>
                <property name="url" value="${jdbc.url}"></property>
                <property name="username" value="${jdbc.username}"></property>
                <property name="password" value="${jdbc.password}"></property>
            </dataSource>
        </environment>
    </environments>
    <!-- 配置映射文件的位置 -->
    <mappers>
        <package name="com.lzy.ssm.mapper"></package>
    </mappers>
</configuration>

测试mybatis——》test的java中创建com/lzy/mybatis/test/MybatisTest.java

添加junit测试依赖

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.11</version>
    <scope>test</scope>
</dependency>

MybatisTest.java测试

@Slf4j
public class MybatisTest {
    @Test
    public void test() throws IOException {
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("mybatis-config.xml"));
        SqlSession sqlSession = factory.openSession();
        AccountMapper accountMapper = sqlSession.getMapper(AccountMapper.class);
        Account account = new Account();
        account.setAccountNo("10086");
        account.setAccountName("小明");
        account.setMoney(new BigDecimal(100000));
        int i = accountMapper.insert(account);
        log.info("{}==>insert account",i);
        sqlSession.commit();
        sqlSession.close();
    }
}

1.2 整合Spring

导入spring依赖

<!-- spring Start -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.1.6.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.1.6.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>5.1.6.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>5.1.6.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.1.6.RELEASE</version>
    </dependency>
    <!-- spring end -->

导入mybatis-spring适配包依赖

<!-- mybatis-spring适配包 -->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>2.0.0</version>
</dependency>

• 配置文件 applicationContext-mapper.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:aop="http://www.springframework.org/schema/aop"
       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/aop
	http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!-- 扫描jdbc配置文件 -->
    <context:property-placeholder location="classpath*:*.properties"></context:property-placeholder>
<!--    <context:property-placeholder location="jdbc.properties"></context:property-placeholder>-->
    
    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="initialSize" value="${jdbc.initialSize}"/>
        <property name="minIdle" value="${jdbc.minIdle}"/>
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="maxWait" value="${jdbc.maxWait}"/>
    </bean>

    <!-- 让Spring容器去管理SqlSessionFactory对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 让Spring容器去创建并管理Mapper接口代理对象-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.lzy.ssm.mapper"/>
    </bean>

</beans>

• 测试

public class SpringTest {

    @Test
    public void springMybatisTest(){
        ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext-mapper.xml");
        AccountMapper accountMapper = ioc.getBean("accountMapper", AccountMapper.class);

        int row = accountMapper.deleteByPrimaryKey(1);
        System.out.println("row = " + row);

    }
}

1.3 Spring配置SqlSessionFactory的bean的详细配置

导入分页插件【可选】

<!-- 分页插件 -->
<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>5.1.10</version>
</dependency>

<!-- 让spring容器去管理sqlsessionfanctory对象-->
    <bean id="SqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 别名配置 -->
        <property name="typeAliasesPackage" value="com.lzy.ssm.pojo"/>
        <!-- 配置mapper.xml文件的位置 mapper.xml的路径可以不和mapper的路径一样 -->
        <property name="mapperLocations" value="classpath:com/lzy/ssm/mapper/*Mapper.xml"/>
        <!-- 配置mybatis全局参数 -->
        <property name="configuration">
            <bean class="org.apache.ibatis.session.Configuration">
                <!-- 驼峰映射 -->
                <property name="mapUnderscoreToCamelCase" value="true"/>
            </bean>
        </property>
        <!-- 分页插件 -->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <!-- 这里的几个配置主要演示如何使用，如果不理解，一定要去掉下面的配置 -->
                    <!-- reasonable=true ：合理化配置
                        当访问上一页是<1时，给你看第一页数据。
                        当访问下一页是>最页数时，给你看最后一页数据。
                    -->
                    <property name="properties">
                        <value>
                            helperDialect=mysql
                            reasonable=true
                        </value>
                    </property>
                </bean>
            </array>
        </property>
    </bean>

1.4 声明式事务

<?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:aop="http://www.springframework.org/schema/aop" 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/aop
	http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 扫描service配置文件 -->
    <context:component-scan base-package="com.lzy.ssm.service.impl"/>
    <!--配置平台事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!-- 配置开启注解对事务的支持 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

package com.lzy.ssm.service.impl;

import com.lzy.ssm.mapper.AccountMapper;
import com.lzy.ssm.pojo.Account;
import com.lzy.ssm.pojo.AccountExample;
import com.lzy.ssm.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.util.List;

/**
 * 账户业务层实现
 */
@Service
@Transactional   //开启读写型事务
public class AccountServiceImpl implements IAccountService {

    @Autowired
    AccountMapper accountMapper;

    @Override
    public boolean transfer(String fromNo, String toNo, Double money) {
		//业务代码
    }
}

2、Spring整合SpringMVC

• Spring有一个容器【dao、service】
• SpringMVC有一个容器【controller】

2.1 父子容器

Spring和SpringMVC的容器具有父子关系
Spring容器为父容器，SpringMVC为子容器
子容器可以引用父容器中的Bean，而父容器不可以引用子容器中的Bean
如果在子容器中找不到bean的时候可以去父容器查找bean。

2.2 容器启动初始化时机

SpringMVC容器：WEB服务器启动时创建

• 因为DispathServlet配置load-on-startup为1

Spring容器：WEB服务器启动时创建，在SpringMVC容器创建之前创建

• 容器应该放在哪个地方最合适

• 放在ServletContext域对象中

• 什么时候放呢？

Spring容器创建完成后，就应该放入到ServletContext域中

ServletContext对象在WEB服务器启动时创建，ServletContextListener可以监听ServletContext对象的创建与销毁

2.3 Spring集成WEB环境

导入SpringMVC依赖

<!-- springmvc start -->
<!-- springmvc依赖 -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.1.6.RELEASE</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.5</version>
</dependency>

<!-- servlet-api -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>
<!-- jsp-api-->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.0</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>
<!-- springmvc end -->

• src/main/webapp/WEB-INF/web.xml中配置一个ContextLoaderListener监听器即可

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext-*.xml</param-value>
    </context-param>

2.4 整合SpringMVC

直接使用SpringMVC即可

• springmvc.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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">
    <!-- 配置创建 spring 容器要扫描的包 -->
    <context:component-scan base-package="com.lzy.ssm.web"></context:component-scan>

    <mvc:annotation-driven>
        <mvc:message-converters>
            <!-- 处理纯字符串中文乱码 -->
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json;charset=UTF-8</value>
                        <value>text/html;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
            <!-- jackson处理中文乱码-->
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json;charset=UTF-8</value>
                        <value>text/html;charset=UTF-8</value>
                    </list>
                </property>
            </bean>

        </mvc:message-converters>
    </mvc:annotation-driven>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
</beans>

• 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_3_1.xsd"
         version="3.1">

    <!-- 启动spring容器 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext-*.xml</param-value>
    </context-param>

    <!-- springmvc容器 -->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 乱码过滤器 -->
    <filter>
        <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

• AccountController

package com.lzy.ssm.web;

import com.lzy.ssm.service.AccountService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/account")
@Slf4j
public class AccountController {

    @Autowired
    private IAccountService accountService;

    @GetMapping("/test")
    @ResponseBody
    public String test(){
        log.info("{}", accountService);
        return "success";
    }

}

安装插件

<build>
    <!-- 配置了很多插件 -->
    <plugins>

        <!-- jdk编译插件 -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <encoding>UTF-8</encoding>
            </configuration>
        </plugin>

        <!-- tomcat插件 -->
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
            <configuration>
                <port>80</port>
                <path>/</path>
                <uriEncoding>UTF-8</uriEncoding>
                <server>tomcat7</server>
            </configuration>
        </plugin>
    </plugins>
</build>

其他依赖【可加】

 <!-- Kaptcha验证码 -->
<dependency>
    <groupId>com.github.penggle</groupId>
    <artifactId>kaptcha</artifactId>
    <version>2.3.2</version>
    <!-- 排除依赖 -->
    <exclusions>
        <exclusion>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<!-- 文件上传 -->
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.3</version>
</dependency>
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.7</version>
</dependency>