yml文件天然的树形结构,无疑让配置和使用变得更加舒适。今天就简单记录一下学习yml进行配置的过程。
一.为了使我们可以使用@ConfigurationProperties注解,我们提前将以下依赖配置在pom.xml当中
<!--yml文件进行配置需要用到的依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
二.编写我们需要的实体类,与我们的application.yml进行映射,并进行测试
Cat.java
package pojo;
public class Cat {
private String catName;
private Integer catAge;
@Override
public String toString() {
return "Cat{" +
"catName='" + catName + '\'' +
", catAge=" + catAge +
'}';
}
public String getCatName() {
return catName;
}
public void setCatName(String catName) {
this.catName = catName;
}
public Integer getCatAge() {
return catAge;
}
public void setCatAge(Integer catAge) {
this.catAge = catAge;
}
}
Person.java
package pojo;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.List;
import java.util.Map;
/**
* 将配置文件中的属性映射到这个组件中
* ConfigurationProperties告诉Springboot将本类中的所有属性和配置文件中
* 相关的配置进行绑定
* prefix用于指明配置的文件是哪个,命名要与配置文件中的一样且大小写敏感
*/
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
private String name;
private Integer age;
private Date birth;
private Map<String,Object> maps;
private List<Object> lists;
private Cat cat;
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 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 Cat getCat() {
return cat;
}
public void setCat(Cat cat) {
this.cat = cat;
}
@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
", age=" + age +
", birth=" + birth +
", maps=" + maps +
", lists=" + lists +
", cat=" + cat +
'}';
}
}
application.yml
server:
port: 8081
person:
name: John
age: 18
birth: 1999/09/09
maps:
k1: k1
k2: k2
# 行内写法,在一行中写
lists: [lisi,zhaowu]
# lists:
# - lisi
# - zhaowu
cat:
catName: 小小
catAge: 1
测试代码:
package com.SpringBoot.hello;
import pojo.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;
/**
* 单元测试
* 为了提前发现缺陷并且在后续开发中避免
*/
@RunWith(SpringRunner.class)
@SpringBootTest
public class HelloApplicationTests {
@Autowired
Person person;
@Test
public void contextLoads() {
System.out.println(person);
}
}
我之前的项目结构是这样的,将pojo与com.SpringBoot.hello放置在同一级,即都在Java目录下,如图
这样的话会导致测试的时候Person类的bean找不到,如图
解决方案:
将pojo移到com.SpringBoot.hello下即可
好了之后我们就运行一下测试类:
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每天进步一点点,开心也多一点点