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
/**
* @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);
}
}