SpringBoot学习笔记（二）
@ConfigurationProperties注解
作用：将application.properties文件中定义的属性映射到所被注解的类上。
注意：被该注解注解的类，还应该添加@Component注解，就是让该类称为spring的的一个组件才行。
package com.zgy.springboot.demo1.bean;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.List;
import java.util.Map;
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
private String lastName;
private int age;
private Date birth;
private boolean boss;
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBirth() {
return birth;
}
public void setBirth(Date birth) {
this.birth = birth;
}
public boolean isBoss() {
return boss;
}
public void setBoss(boolean boss) {
this.boss = boss;
}
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 +
", birth=" + birth +
", boss=" + boss +
", maps=" + maps +
", lists=" + lists +
", dog=" + dog +
'}';
}
}
package com.zgy.springboot.demo1.bean;
public class Dog {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
person.lastName=独生
person.age=22
person.birth=1996/11/18
person.boss=true
person.maps.k1=v1
person.maps.k2=v2
person.lists=a,b,c
person.dog.name=yy
person.dog.age=1
package com.zgy.springboot.demo1;
import com.zgy.springboot.demo1.bean.Person;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class Demo1ApplicationTests {
@Autowired
private Person person;
@Test
public void contextLoads() {
System.out.printf("Person"+person);
}
}
@PropertySource注解
作用：指定一个properties文件中的属性来映射到所被注解的类上。
注意：还要使用@Component，@ConfigurationProperties这两个注解。
将上面的Person代码修改如下
package com.zgy.springboot.demo1.bean;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.List;
import java.util.Map;
// 将其作为spring的一个组件
@Component
//读取配置文件中的头，来分辨要映射的属性
@ConfigurationProperties(prefix = "person")
//指定配置文件
@PropertySource(value = {"classpath:person.properties"})
public class Person {
private String lastName;
private int age;
private Date birth;
private boolean boss;
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBirth() {
return birth;
}
public void setBirth(Date birth) {
this.birth = birth;
}
public boolean isBoss() {
return boss;
}
public void setBoss(boolean boss) {
this.boss = boss;
}
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 +
", birth=" + birth +
", boss=" + boss +
", maps=" + maps +
", lists=" + lists +
", dog=" + dog +
'}';
}
}
@ImportResource注解
作用：将spring的配置文件，比如bean.xml加载到springboot中
package com.zgy.springboot.demo1;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;
@SpringBootApplication
//locations = {"classpath:beans.xml"}：spring的配置文件路径
@ImportResource(locations = {"classpath:beans.xml"})
public class Demo1Application {
public static void main(String[] args) {
SpringApplication.run(Demo1Application.class, args);
}
}
package com.zgy.springboot.demo1;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class Demo1ApplicationTests {
@Autowired
private ApplicationContext ioc;
@Test
public void test(){
System.out.println("DATA:"+ioc.containsBean("helloService"));
}
}
SpringBoot推荐的配置方法
就是是用@Configuration注解
package com.zgy.springboot.demo1.config;
import com.zgy.springboot.demo1.service.HelloService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/*
@Configuration，使用该注解说明该类是一个配置类
*/
@Configuration
public class MyConfig {
/*
@Bean，定义一个Bean
*/
@Bean
public HelloService helloService(){
return new HelloService();
}
}
package com.zgy.springboot.demo1;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class Demo1ApplicationTests {
@Autowired
private ApplicationContext applicationContext;
@Test
public void contextLoads() {
/*
通过applicationContext的containsBean方法，查看bean是否在容器中
*/
boolean b = applicationContext.containsBean("helloService");
System.out.println(b);
}
}
