org.springframework.boot
spring-boot-configuration-processor
true
org.springframework.boot
spring-boot-autoconfigure
说明:
第一个依赖 主要是为编译器配置的 可以根据properties 鼠标右键 点到用这个属性的类上个
第二个依赖 主要是为了自动装配
package com.myboot;
/**
* 目标功能实现类
*/
public class GetHashCodeClass {
private String targe;
public GetHashCodeClass(String target){
this.targe = target;
}
public String getHashCode(){
return String.valueOf(this.targe.hashCode());
}
}
package com.myboot;
import org.springframework.boot.context.properties.ConfigurationProperties;
@ConfigurationProperties("target.string")
public class AutoConfigruationProperties {
private String target;
public String getTarget() {
return target;
}
public void setTarget(String target) {
this.target = target;
}
}
这里我们要读取的配置就是target.string.targer的值@ConfigurationProperties注解
的作用就是读取配置文件指定属性的值
package com.myboot;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
@EnableConfigurationProperties(AutoConfigruationProperties.class)
@ConditionalOnClass(GetHashCodeClass.class)
public class AutoConfigrutionClass {
@Autowired
private AutoConfigruationProperties autoConfigruationProperties;
@ConditionalOnMissingBean
@Bean
public GetHashCodeClass getHashCodeClass(){
return new GetHashCodeClass(autoConfigruationProperties.getTarget());
}
}
标识本类是配置类(相当于spring中application.xml)
如果AutoConfigruationProperties中有注解@ConfigurationProperties 那么这个类就
会被加到spring上下文的容器中,也就是可以通过@Autowire来注入
当类路径下有指定类的情况下 才进行下一步
当spring容器中没有这个Bean的时候才进行下一步
org.springframework.boot.autoconfigure.EnableAutoConfiguration=
com.myboot.AutoConfigrutionClass
target:
string:
target:
nihao
这就有了默认值
通过maven install命令 发布在本地 ,然后在其他项目引入这个jar 测试时 直接自动注入我们的bean就ok了
前置条件 引入两个jar包 pom.xml
4.0.0
com.test.springboot
myself-spring-boot-starter
1.0-SNAPSHOT
org.springframework.boot
spring-boot-starter-parent
2.1.0.RELEASE
org.springframework.boot
spring-boot-configuration-processor
true
org.springframework.boot
spring-boot-autoconfigure
package com.myboot;
/**
* 目标功能实现类
*/
public class GetHashCodeClass {
private String targe;
public GetHashCodeClass(String target){
this.targe = target;
}
public String getHashCode(){
return String.valueOf(this.targe.hashCode());
}
}
package com.myboot;
import org.springframework.boot.context.properties.ConfigurationProperties;
@ConfigurationProperties(prefix = "target.string")
public class AutoConfigruationProperties {
private String target;
public String getTarget() {
return target;
}
public void setTarget(String target) {
this.target = target;
}
}
package com.myboot;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
@EnableConfigurationProperties(AutoConfigruationProperties.class)
@ConditionalOnClass(GetHashCodeClass.class)
public class AutoConfigrutionClass {
@Autowired
private AutoConfigruationProperties autoConfigruationProperties;
@ConditionalOnMissingBean
@Bean
public GetHashCodeClass getHashCodeClass(){
return new GetHashCodeClass(autoConfigruationProperties.getTarget());
}
}
target:
string:
target:
nihao
org.springframework.boot.autoconfigure.EnableAutoConfiguration=
com.myboot.AutoConfigrutionClass
maven install 发布到本地
测试是否成功
新建springboot工程 引入jar包
com.test.springboot
myself-spring-boot-starter
1.0-SNAPSHOT
直接进行单元测试
package com.xyd;
import com.myboot.GetHashCodeClass;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import javax.annotation.Resource;
import java.util.HashMap;
import java.util.Map;
import static org.junit.Assert.*;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class ControllerTest {
@Autowired
private GetHashCodeClass getHashCodeClass;
@Test
public void testStarter(){
System.out.println(getHashCodeClass.getHashCode());
}
}
运行成功获取hashcode
在application.yml中覆盖原来的属性
target:
string:
target:
gogogogogoogo
测试得hashcode不一致 证明成功
注意别忘记印引入springboot的parent 与test启动器