SpringBoot加载mapper.xml的两种方法

(1)在yml里面配置mapper文件的路径

mybatis:

     type-aliases-package: com.entity

     mapper-locations: classpath:mapper/*.xml

(2)在启动类里面添加mapper类的扫描包

@SpringBootApplication

@MapperScan("com.mapper")

public class PlanApplication {}

（1）在pom.xml文件里面配置资源文件加载路径

<build>

<resources>

<resource>

<directory>src/main/java</directory>

<includes>

<include>**/*.properties</include>

<include>**/*.xml</include>

</includes>

<filtering>false</filtering>

</resource>

</resources>

</build>

(2)在yml里面配置实体类的别名

mybatis:

     type-aliases-package: com.entity

(3)在启动类里面添加mapper类的扫描包

@SpringBootApplication

@MapperScan("com.mapper")

public class PlanApplication {}

在spring boot中，简单几步，读取配置文件（application.yml）中各种不同类型的属性值：

1、引入依赖：

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<!-- 支持 @ConfigurationProperties 注解 -->

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-configuration-processor</artifactId>

<optional>true</optional>

</dependency>

2、配置文件（application.yml）中配置各个属性的值：

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myProps: #自定义的属性和值

simpleProp: simplePropValue

arrayProps: 1,2,3,4,5

listProp1:

- name: abc

value: abcValue

- name: efg

value: efgValue

listProp2:

- config2Value1

- config2Vavlue2

mapProps:

key1: value1

key2: value2

3、创建一个bean来接收配置信息：

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@Component

@ConfigurationProperties(prefix="myProps") //接收application.yml中的myProps下面的属性

public class MyProps {

private String simpleProp

private String[] arrayProps

private List<Map<String, String>>listProp1 = new ArrayList<>()//接收prop1里面的属性值

private List<String>listProp2 = new ArrayList<>()//接收prop2里面的属性值

private Map<String, String>mapProps = new HashMap<>()//接收prop1里面的属性值

public String getSimpleProp() {

return simpleProp

}

//String类型的一定需要setter来接收属性值；maps, collections, 和 arrays 不需要

public void setSimpleProp(String simpleProp) {

this.simpleProp = simpleProp

}

public List<Map<String, String>>getListProp1() {

return listProp1

}

public List<String>getListProp2() {

return listProp2

}

public String[] getArrayProps() {

return arrayProps

}

public void setArrayProps(String[] arrayProps) {

this.arrayProps = arrayProps

}

public Map<String, String>getMapProps() {

return mapProps

}

public void setMapProps(Map<String, String>mapProps) {

this.mapProps = mapProps

}

}

启动后，这个bean里面的属性就会自动接收配置的值了。

4、单元测试用例：

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@Autowired

private MyProps myProps

@Test

public void propsTest() throws JsonProcessingException {

System.out.println("simpleProp: " + myProps.getSimpleProp())

System.out.println("arrayProps: " + objectMapper.writeValueAsString(myProps.getArrayProps()))

System.out.println("listProp1: " + objectMapper.writeValueAsString(myProps.getListProp1()))

System.out.println("listProp2: " + objectMapper.writeValueAsString(myProps.getListProp2()))

System.out.println("mapProps: " + objectMapper.writeValueAsString(myProps.getMapProps()))

}

测试结果：

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simpleProp: simplePropValue

arrayProps: ["1","2","3","4","5"]

listProp1: [{"name":"abc","value":"abcValue"},{"name":"efg","value":"efgValue"}]

listProp2: ["config2Value1","config2Vavlue2"]

mapProps: {"key1":"value1","key2":"value2"}

SpringBootRun方法会在应用启动时扫描配置类。SpringBootRun方法是一个静态方法，它可以接受一个参数，该参数是一个字符串数组，其中包含要传递给应用程序的参数。SpringBootRun方法会调用SpringApplication类的run方法，该方法会接受一个参数，该参数是一个配置类，它包含了应用程序所需的所有配置信息。在调用run方法之后，SpringBootRun方法会扫描该配置类，以确定应用程序需要加载哪些组件。一旦所有组件都被加载，应用程序就可以正常运行了。

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