java框架之Spring boot二：SpringBoot配置获取

Posted 2023-02-15 爸爸去哪了2之熊猫三胞胎

java框架之Spring boot二：SpringBoot配置获取

resources文件夹中的目录结构：
static：保存所有的静态资源；js，css，images
templates:保存所有的模板页面；
application.properties:配置文件,可以修改一些默认配置

配置文件的作用：修改SpringBoot自动配置的默认值；SpringBoot在底层都给我们自动配置好

配置文件书写类型主要有两中，一种为properties，一种是yaml。这边是使用properties。

配置文件的书写：

server.port=8081
#idea使用的是UTF-8，properties使用的ascll码，所以会乱码
#Person
person.name=lala
person.age=18
person.birth=2017/12/15
person.boss=false
person.maps.k1=v1
person.maps.k2=15
person.lists=a,b,c
person.dog.name=dog
person.dog.age=15

对应bean类的书写，Person：

package com.example.demo.bean;


import java.util.Date;
import java.util.Map;
import java.util.List;

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

@Component
@ConfigurationProperties(prefix="person")
public class Person 
    /**/
    private String name;
    private Integer age;
    private Boolean boss;
    private Date birth;
    private Map<String, Object> maps;
    private List<Object> lists;
    private Dog dog;
    public Person() 
        super();
    
    public Person(String name, Integer age, Boolean boss, Date birth, Map<String, Object> maps, List<Object> lists,
            Dog dog) 
        super();
        this.name = name;
        this.age = age;
        this.boss = boss;
        this.birth = birth;
        this.maps = maps;
        this.lists = lists;
        this.dog = dog;
    
    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;
    
    public Boolean getBoss() 
        return boss;
    
    public void setBoss(Boolean boss) 
        this.boss = boss;
    
    public Date getBirth() 
        return birth;
    
    public void setBirth(Date birth) 
        this.birth = birth;
    
    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=" + name + ", age=" + age + ", boss=" + boss + ", birth=" + birth + ", maps="
                + maps + ", lists=" + lists + ", dog=" + dog + "]";
    

对应bean类的书写，Dog:

package com.example.demo.bean;



public class Dog 
    private String name;
    private Integer age;
    public Dog() 
        super();
    
    public Dog(String name, Integer age) 
        super();
        this.name = name;
        this.age = 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 + "]";
    

实现类的书写：

package com.example.demo.controller;

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

import com.example.demo.bean.Person;

@RestController
public class PersonController 

    @Autowired
    private Person person;

    @RequestMapping("person")
    public String  person()
        return person.toString();
    

现在我们来说明一下，实现类的两个注解：
@Component:@component就是说把这个类交给Spring管理
@ConfigurationProperties(prefix=”person”):使用@ConfigurationProperties，它可以把同类的配置信息自动封装成实体类