SpringBoot入门(五) 之 @ConfigurationProperties和@Value的区分与用法

<bean class="Person">
  <property name="username" value="张三(或从配置文件读取${key},或者#{key}SPEL获取)"></property>
</bean>

package com.zhanshen.domain;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.List;
import java.util.Map;
/**
 *
 * 将配置文件中的每一个值映射到bean里边,我们就需要一个注解
 * @ConfigurationProerties 该注解就是springboot将配置文件中的值与该类所有属性相绑定
 * 里边有一个prefix的值,就是要指明绑定那一个数据,这里边server 和 person要选一个,明显我们要绑定Person
 * 只有这个组件是容器中的组件,才能使用容器中的功能.所以我们再添加一个注解@Component
 */
@Component
//@ConfigurationProperties(prefix = "person")
public class Person {
    @Value("张三")
    private String username;
    @Value("#{12 * 2}")
    private Integer age;
    @Value("${person.birthday}")
    private Date birthday;
    private boolean boss;
    private Map<String, Object> maps;
    private List<Object> lists;
    private Dog dog;
    public Dog getDog() {
        return dog;
    }
    public void setDog(Dog dog) {
        this.dog = dog;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
    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;
    }
    @Override
    public String toString() {
        return "Person{" +
                "username='" + username + '\'' +
                ", age=" + age +
                ", birthday=" + birthday +
                ", boss=" + boss +
                ", maps=" + maps +
                ", lists=" + lists +
                ", dog=" + dog +
                '}';
    }
}

package com.zhanshen.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
    @Value("${person.username}")
    private String name;
    @RequestMapping("/sayHello")
    public String sayHello() {
        return "hello" + name;
    }
}