【spring boot】映射properties文件属性--到Java对象

描述

将*.properties中的内容映射到java对象中；

主要步骤

1. 添加 @Component 注解；
2. 使用 @PropertySource 注解指定配置文件位置；
3. 使用 @ConfigurationProperties 注解，设置相关属性；

---

my.properties

author.name=ssslinppp
author.age=128
author.student.name=studentName
author.student.age=88

---

AuthorSettings.java

package com.sssppp;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "author")
@PropertySource("classpath:my.properties")
public class AuthorSettings {
    private String name;
    private Long age;
    private Student student;

    public Student getStudent() {
        return student;
    }

    public void setStudent(Student student) {
        this.student = student;
    }

    public String getName() {
        return name;
    }

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

    public Long getAge() {
        return age;
    }

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

Student.java

package com.sssppp;

public class Student {
    private String name;

    private int age;

    public Student() {
        super();
    }

    public Student(String name, int age) {
        super();
        this.name = name;
        this.age = 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;
    }
    
    @Override
    public String toString() {
        return "Student [name=" + name + ", age=" + age + "]";
    }

}

---

测试类

package com.sssppp;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Ch623 {

    @Autowired
    private AuthorSettings authorSettings;

    @RequestMapping("/ch623")
    public AuthorSettings index() {
        return authorSettings;
    }
}

测试结果

{"name":"ssslinppp","age":128,"student":{"name":"studentName","age":88}}