Spring配置

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Spring配置

applicationContext.xml

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<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

注解

要使用注解:

  1. 导入约束

  2. 配置注解的支持context:annotation-config/

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    <?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"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
            https://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context
            https://www.springframework.org/schema/context/spring-context.xsd">

        <context:annotation-config/>

    </beans>

  3. 在属性中标记@Autowired,也可以在set方式上使用,是用Autowired我们可以不用编写Set方法,前提是这个自动装配的属性咋IOC(Spring) 容器中存在,且符合名字byName

  4. 科普:

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    @Nullable可以设置属性为空
    Autowired(required = false) 如果显式定义了该属性为false,说明这个对象可以为null,否则不允许为空
    @Qualifire(value="xxx") 指定唯一bean对象

  5. @Resource 和 @Autowired 的区别:

    1. 都是用来自动装配的,都可以放在属性字段上
    2. @Autowired通过byType,必须要求对象存在
    3. @Resource默认通过byName方式,如果找不到名字,则通过byType实现,如果都找不到报错

Mybatis整合

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<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.9.RELEASE</version>
        </dependency>
        <!--Spring操作数据库的话,还需要一个spring-jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>
  
    </dependencies>

Mybatis配置

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<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="zzz"/>
            </dataSource>
        </environment>
    </environments>
    <!--每一个Mapper.XML都需要在Mybatis核心配置文件中注册!-->
    <mappers>
        <mapper resource="zone/yiqing/dao/UserMapper.xml"/>
    </mappers>
</configuration>

Maven

静态资源过滤问题

添加到pom.xml

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<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>

编译版本问题

编译时候出现了 Version 5 not supportted 的错误,经google发现是需要在配置文件中指定maven的编译

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<properties>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
</properties>

YiqingWeb Developer

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