09.SSM框架集~Spring(二)

09.SSM框架集~Spring(二)

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Spring結合Mybatis

使用Maven創建WEB項目,詳細方法可以回顧該文章

本章源碼       提取碼:0klr

先導包

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>com.bjsxt</groupId>
  <artifactId>spring_mybatis_login</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <properties>
    <mysql-version>8.0.11</mysql-version>
    <mybatis-version>3.5.2</mybatis-version>
    <spring-version>5.2.2.RELEASE</spring-version>
    <mybatis-spring-version>2.0.4</mybatis-spring-version>
    <slf4j-version>1.7.25</slf4j-version>
    <jstl-version>1.2</jstl-version>
    <servlet-api-version>3.1.0</servlet-api-version>
    <jsp-version>2.2</jsp-version>
    <junit-version>4.12</junit-version>
  </properties>

  <dependencies>
    <!--mysql的驅動依賴-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql-version}</version>
    </dependency>
    <!--mybatis的核心依賴-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis-version}</version>
    </dependency>
    <!--springIOC的核心依賴-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring-version}</version>
    </dependency>

    <!--spring-jdbc連依賴-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring-version}</version>
    </dependency>
    <!--mybatis連接spring的依賴-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis-spring-version}</version>
    </dependency>

    <!--日誌依賴-->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j-version}</version>
    </dependency>

    <!--jstl依賴-->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl-version}</version>
    </dependency>

    <!--gson依賴-->
    <dependency>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
      <version>2.8.5</version>
    </dependency>

    <!--jsp-servlet-api-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${servlet-api-version}</version>
      <scope>provided</scope>
    </dependency>

    <!--jsp-api-->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>${jsp-version}</version>
      <scope>provided</scope>
    </dependency>

    <!--單元測試的依賴-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junit-version}</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

如果不清楚包名或者沒有版本,可以去Maven官網搜索

       然後import就可以了

       在過去我們配置Mybatis的時候是這樣的

       我們寫工具類是這樣的

       接着就是業務層

然而現在,我們不再使用以前的方法了~

現在我們這樣

比如實現一個查詢全部信息的需求

sql字段

搭建框架

配置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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!-- 連接數據庫獲得數據源 -->
    <!-- spring-jdbc-4.1.6.RELEASE.jar -->
    <bean id="ds" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <!--spring-jdbc-4.1.6.RELEASE.jar 包
          org.springframework.jdbc.datasource.DriverManagerDataSource extends AbstractDriverBasedDataSource
          對應的參數,不可更改!-->
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/project?useSSL=false&amp;useUnicode=true&amp;characterEncoding=utf8&amp;serverTimezone=Asia/Shanghai"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

    <!--  獲得sqlsession工廠對象  -->
    <!--
        mybatis-spring-1.2.3.jar包
      -->
    <bean id="factory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="ds"/>
        <!-- org.mybatis.spring.SqlSessionFactoryBean下面  -->
        <property name="typeAliasesPackage" value="com.alvin.pojo"/>
    </bean>
    <!--  掃描mapper文件  -->
    <bean id="mapper" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="factory"/>
        <property name="basePackage" value="com.alvin.mapper"/>
    </bean>
<!--  service  -->
    <bean id="studentService" class="com.alvin.service.impl.LeaveRecordsServiceImpl">
        <property name="leaveRecordsMapper" ref="leaveRecordsMapper"/>
    </bean>

</beans>

Mapper

public interface LeaveRecordsMapper {
    //查詢所有信息
    @Select("select * from LeaveRecords")
    List<LeaveRecord> FindAll();
    }

service

  //創建Mapper對象
   private LeaveRecordsMapper leaveRecordsMapper;
    //這裏必須要有set!
    public void setLeaveRecordsMapper(LeaveRecordsMapper leaveRecordsMapper) {
        this.leaveRecordsMapper = leaveRecordsMapper;
    }

    //查詢全部信息
    public List<LeaveRecord> FindAll() {
        List<LeaveRecord> list = leaveRecordsMapper.FindAll();
        return list;
    }
 }

代碼測試

    public static void FindAll(){
    	ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
    	LeaveRecordsService leaveRecordsService = applicationContext.getBean(LeaveRecordsService.class);
        //數據庫測試
        List<LeaveRecord> list =  leaveRecordsService.FindAll();
        Iterator iterator = list.iterator();
        while(iterator.hasNext()){
            System.out.println(iterator.next());
        }
    }

這樣就可以了~文章最上方有源碼鏈接