Spring框架学习笔记(4)——SSM整合以及创建Maven自定义模版骨架

Spring+Spring MVC+MyBatis+Maven

SSM整合的核心还是Spring+MyBatis的整合,回顾一下MyBatis操作数据库流程,我们是使用一个SQLSessionFactory对象来获得SQLSession,之后再进行CRUD操作。

现在,有了spring,我们就把SQLSessionFactory通过spring进行装载和管理。

如果是想直接使用的话,请去SSM-Maven-Archetype

步骤

1.创建maven项目

2.添加依赖

<?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.wan</groupId>
    <artifactId>SSM-Template</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>SSM-Template 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>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <!--日志-->

        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.3.9.release</version>
        </dependency>
        <!--AOP-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.3.9.release</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>RELEASE</version>
        </dependency>
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>RELEASE</version>
        </dependency>
        <!-- springmvc依赖的json库(如果使用@responsebody注解返回json数据) -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.7.3</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.3.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
        </dependency>
        <!-- jstl 1.2.5 version libarary -->
        <dependency>
            <groupId>org.apache.taglibs</groupId>
            <artifactId>taglibs-standard-spec</artifactId>
            <version>1.2.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.taglibs</groupId>
            <artifactId>taglibs-standard-impl</artifactId>
            <version>1.2.5</version>
        </dependency>
        <!-- oracle driver -->
        <dependency>
            <groupId>com.github.noraui</groupId>
            <artifactId>ojdbc8</artifactId>
            <version>12.2.0.1</version>
        </dependency>
        <!-- mybatis orm框架 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!--阿里巴巴连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!-- spring整合mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
        <!--文件上传-->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- 日志库 -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.25</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.25</version>
        </dependency>
        <!-- apache libraries -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.5</version>
        </dependency>
        <!--MyBatis分页插件-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <!--自动下载最新版本 -->
            <version>5.1.6</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>SSM-Template</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>

3.整合SpringMVC

前三步主要是整合Spring+SpringMVC框架,可以参考一下这篇Spring MVC框架,这里不过多补充

4.整合Spring和MyBatis

spring中,完美地整合了MyBatis,所以,可以不需要MyBatis的配置的文件,如果需要的话,也可以配置MyBatis的配置文件,之后引入即可

主要流程为:

  1. 创建一个db.properties,存放数据库url、账户和密码
  2. 创建DataSource的bean对象(使用连接池,利用上面的db.properties)
  3. 创建MyBatis的SqlSessionFactory的bean对象(使用上面的DataSourcebean的bean对象)
  4. 配置自动装载mapper接口

下面是我的spring配置,使用了阿里巴巴的连接池开源库,以及MyBatis的分页插件

<?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:p="http://www.springframework.org/schema/p"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:mybatis="http://mybatis.org/schema/mybatis-spring"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
            http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
            http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd">

    <!--
        1. 扫描Service 组件, Mapper 组件
            @Service, @Repository
        2. 配置数据源
        3. 集合mybatis一些相关配置
        4. 数据库事务管理器
        5. AOP事务,即通过AOP方式将数据库事务切到指定的Service组件
    -->

    <context:annotation-config />

    <!-- 扫描dao类(service),可以有多个包使用逗号分隔包名,以完成Bean创建和自动依赖注入的功能-->
    <!--<context:component-scan base-package="dao" />-->

    <!-- 引用属性文件中的数据库资源-->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations" value="classpath:db.properties"/>
    </bean>

    <!-- 声明一个alibaba druid 数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          init-method="init" destroy-method="close">
        <!-- 基本属性 url、user、password -->
        <property name="url" value="${url}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
        <!-- <property name="driverClassName" value="${jdbc.driver}"></property> -->
        <!-- 配置初始化大小、最小、最大 -->
        <property name="initialSize" value="1" />
        <property name="minIdle" value="1" />
        <property name="maxActive" value="20" />
        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="60000" />
        <!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="300000" />
        <property name="validationQuery" value="SELECT 'x' FROM DUAL" />
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <!-- 打开PSCache,并且指定每个连接上PSCache的大小 -->
        <property name="poolPreparedStatements" value="true" />
        <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
        <!-- 配置监控统计拦截的filters -->
        <property name="filters" value="stat,log4j" />
    </bean>

    <!-- 声明 mybatis SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 需要的话,可以引入单独的myBatis配置文件 -->
        <!--<property name="configLocation" value="classpath:mybatis-config.xml"/>-->

        <!--可以在此处配置SQL映射文件,但其中不能有相同id的parameterMap, resultMap或sql等-->
        <property name="mapperLocations" value="classpath*:mapper/*.xml" />

        <property name="typeAliasesPackage" value="model" />
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <!--使用下面的方式配置参数,一行配置一个 -->
                        <value>
                            <!-- 支持通过Mapper接口参数来传递分页参数
   helperDialect=oracle,mysql,mariadb,sqlite,hsqldb,postgresql,db2,sqlserver,informix,h2,sqlserver2012,derby
                            -->
                            helperDialect=oracle
                            supportMethodsArguments=true
                            rowBoundsWithCount=true
                            offsetAsPageNum=true
                            pageSizeZero=false
                            reasonable=true
                        </value>
                    </property>
                </bean>
            </array>
        </property>

    </bean>

    <!-- Scan Mapper Files -->
    <!-- 这种方式也可扫描Mapper接口 -->
    <!--<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="mapper" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>-->
    <!-- scan for mappers and let them be autowired -->
    <mybatis:scan base-package="dao" />

    <!--================事务相关控制===================-->
    <bean name="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- AOP事务
     Service:
      newAccount(){
         DAO:
         1. from
         2. to
         3. log
       }

      <tx:method name="insert*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />

          propagation: 事务的传播行为
          read-only:是否是只读事务,此事务内只能做查询,不能做insert,update,delete操作
          rollback-for: 当出现此类异常时,该事务回滚

      // 必须开启事务
      UserService.insertUser(){

        // otherService.findX()
        otherService.insertXxx(); // c)	Requires_New: 新事务
      }
     -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="insert*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
            <tx:method name="add*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
            <tx:method name="new*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
            <tx:method name="save*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
            <tx:method name="delete*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
            <tx:method name="update*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="select*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="query*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice>

    <!--aop配置-->
    <aop:config>

    </aop:config>

</beans>

5.生成maven骨架

打开IDEA中的命令行窗口,输入下面命令(得配置好maven的环境变量)

mvn archetype:create-from-project

出现build success就说明成功了

PS: 保留空白文件夹的解决方法

上述创建的项目有几个是空白文件夹,但是安装骨架之后,使用骨架创建maven项目的时候发现,空白文件夹被忽略了,找到了网上的两个解决方法

  1. 在空白文件夹放文件
  2. 修改配置

这里就讲一下第二种方法,是在Stack Overflow找到的方法

执行mvn archetype:create-from-project之后,修改target/generated-sources/archetype/src/main/resources/META-INF/maven archetype-metadata.xml

<fileSet encoding="UTF-8">
  <directory>src/main/application/controller</directory>
</fileSet>

下面是我的添加部分:

<fileSet filtered="true" encoding="UTF-8">
  <directory>src/main/java</directory>
  <includes>
	<include>**/*.java</include>
  </includes>
</fileSet>
<fileSet encoding="UTF-8">
  <directory>src/main/java/controller</directory>
</fileSet>
<fileSet encoding="UTF-8">
  <directory>src/main/java/dao</directory>
</fileSet>
<fileSet encoding="UTF-8">
  <directory>src/main/java/model</directory>
</fileSet>
<fileSet encoding="UTF-8">
  <directory>src/main/resources/mapper</directory>
</fileSet>
<fileSet encoding="UTF-8">
  <directory>src/main/webapp/css</directory>
</fileSet>
<fileSet encoding="UTF-8">
  <directory>src/main/webapp/img</directory>
</fileSet>
<fileSet encoding="UTF-8">
  <directory>src/main/webapp/js</directory>
</fileSet>
<fileSet encoding="UTF-8">
  <directory>src/main/webapp/view</directory>
</fileSet>

除此之外,还有几个文件需要修改
target\generated-sources\archetype\src\main\resources\archetype-resources\src\main\resources下面的spring和springmvc两个配置文件

target\generated-sources\archetype\src\main\resources\archetype-resources\src\main\webapp中的web.xml

里面的xml版本莫名其妙变成了1.0-SNAPSHOT,我们全部改成固定的1.0

6.安装并添加maven骨架

命令行路径进入到target\generated-sources\archetype

cd target\generated-sources\archetype

输入安装命令

mvn clean install

出现build success表示成功

打开target\generated-sources\archetype目录下的pom.xml,记住下面的前三个坐标信息

重新新建一个maven项目,之后,选择添加一个archetype,输入坐标

之后就是可以看到列表由我们的自定义骨架了

7.使用maven骨架

像之前一样,选择我们的自定义骨架,新建一个maven项目

使用注意事项

修改配置

根据自己的要求,进行配置的更改

首先是数据源的配置db.properties

spring-config.xml
72行 mapper的路径(相对于resources目录来说)

105行 dao类中的包,

<mybatis:scan base-package="dao" />

是会自动扫描Mapper所在的包,并生成一个id为xx的bean(Dao对象),之后我们就可以通过spring容器获得这个对象,使用这个对象来进行CRUD操作

相当于下面的代码

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
	<property name="basePackage" value="dao" />
	<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>

Mybatis使用

Mybatis中,我们可以按照约定,把接口类和mapper.xml文件对应起来,从而更为简单地实现CRUD操作

项目中,我有这样的对应的接口类和mapper.xml文件

UserMapper中的namespace就是为dao.UserDao,这里namespace一定要对应上接口类UserDao

UserMapper.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">
<!--
namespace: 命名空间,用于标识每一个Mapper XML文件中的语句,预防在不同的Mapper XML文件中存在相同的语句ID
-->
<mapper namespace="dao.UserDao">
    <!--
        resultType: 也称为自动映射,只有在表的列名与POJO类的属性完全一致时使用,会比较方便,全类名
    -->
    <select id="select" resultType="model.Users">
        select * from USERS
    </select>
</mapper>

UserDao.java

package dao;

import java.util.List;

import model.Users;

/**
 * @author StarsOne
 * @date Create in  2019/10/11 0011 20:22
 * @description
 */
public interface UserDao {
    List<Users> select();
}

使用的话就通过这样

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring/spring-config.xml");
//spring中自动装载,第一个字母小写,如果是EmployeeDao,则是就是employeeDao
UserDao userMapper = (UserDao) context.getBean("userDao");
List<Users> users = userMapper.selectAll();
for (Users user : users) {
	System.out.println(user.toString());
}

分页使用

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring/spring-config.xml");
AccountDao acountDao = (AccountDao) context.getBean("accountDao");
//查询第一页,每页有两条数据
PageHelper.startPage(1, 2);
List<Account> accounts = acountDao.selectAll();
for (Account account : accounts) {
	System.out.println(account.toString());
}
posted @ 2019-10-12 13:34  Stars-one  阅读(284)  评论(0编辑  收藏