Spring Boot--配置2

目录结构

导入依赖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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.uek</groupId>
    <artifactId>spring-boot02</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot02</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--导入配置文件处理器，配置文件进行绑定就会有提示-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Dog类

public class Dog {

    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

Person 类

@Component
@ConfigurationProperties(prefix = "person")
//@Validated    //校验
@PropertySource(value = {"classpath:person.properties"})    //可以加载指定的配置文件
public class Person {

    //@Value("${person.last-name}")    //不支持数据校验
    //@Email    //lastName必须填是邮箱格式
    private String lastName;
   //@Value("#{11*2}")
    private Integer age;
    //@Value("true")
    private Boolean boss;
    private Date brith;

    //@Value("${person.maps}")    //不支持   报错
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Boolean getBoss() {
        return boss;
    }

    public void setBoss(Boolean boss) {
        this.boss = boss;
    }

    public Date getBrith() {
        return brith;
    }

    public void setBrith(Date brith) {
        this.brith = brith;
    }

    public Map<String, Object> getMaps() {
        return maps;
    }

    public void setMaps(Map<String, Object> maps) {
        this.maps = maps;
    }

    public List<Object> getLists() {
        return lists;
    }

    public void setLists(List<Object> lists) {
        this.lists = lists;
    }

    public Dog getDog() {
        return dog;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }

    @Override
    public String toString() {
        return "Person{" +
                "lastName='" + lastName + '\'' +
                ", age=" + age +
                ", boss=" + boss +
                ", brith=" + brith +
                ", maps=" + maps +
                ", lists=" + lists +
                ", dog=" + dog +
                '}';
    }
}

在controller目录下新建HelloController类

@RestController
public class HelloController {

    @Value("${person.last-name}")   //配置文件中获取
    private String name;

    @RequestMapping("/sayHello")
    public String sayHello(){
        return  "Hello" + name;
    }
}

在resources目录下新建person.properties
把person的配置写在里面

person.last-name=李四
person.age=19
person.brith=2019/11/26
person.boss=false
person.maps.k1=v1
person.maps.k2=14
person.lists=a,b,c
person.dog.name=dog
person.dog.age=15

@ImportResource：导入Spring的配置文件，让配置文件里面的内容生效
Spring Boot里面没有Spring的配置文件，我们自己编写的配置文件，也不能自动识别；
想让Spring的配置文件生效，加载进来。@ImportResource标注在一个配置类上

测试类

@SpringBootTest
class SpringBoot02ApplicationTests {

    @Autowired
    Person person;

    @Test
    void contextLoads() {
        System.out.println(person);
    }

}

Spring Boot推荐给容器中添加组件的方式：推荐使用全注解的方式
1）先写一个配置类
2）使用@Bean给容器中添加组件

在service下面新建类HelloService

public class HelloService {
}

在config包下新建类MyAppConfig类

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/**
 * @Configuration:指明当前类是一个配置类，就是来替代之前的spring配置文件
 */
@Configuration
public class MyAppConfig {

    //将方法的返回值添加到容器中，容器中的这个组件默认的id就是方法名
    @Bean
    public HelloService helloService(){
        System.out.println("配置类@Bean给容器中添加组件了...");
        return new HelloService();
    }
}

测试类

@SpringBootTest
class SpringBoot02ApplicationTests {

    @Autowired
    ApplicationContext ioc;

    @Test
    public void testHelloService(){
        boolean b = ioc.containsBean("helloService");
        System.out.println(b);
    }
}