Spring Boot读取配置的几种方式

读取application文件

在application.yml或者properties文件中添加：

info.address=USA

info.company=Spring

info.degree=high

@Value注解读取方式

1. import org.springframework.beans.factory.annotation.Value;

2. import org.springframework.stereotype.Component;

3.  

4. @Component

5. publicclassInfoConfig1{

6.  

7.    @Value("${info.address}")

8.    privateString address;

9.  

10.    @Value("${info.company}")

11.    privateString company;

12.  

13.    @Value("${info.degree}")

14.    privateString degree;

15.  

16.    publicString getAddress(){

17.        return address;

18.    }

19.  

20.    publicvoid setAddress(String address){

21.        this.address = address;

22.    }

23.  

24.    publicString getCompany(){

25.        return company;

26.    }

27.  

28.    publicvoid setCompany(String company){

29.        this.company = company;

30.    }

31.  

32.    publicString getDegree(){

33.        return degree;

34.    }

35.  

36.    publicvoid setDegree(String degree){

37.        this.degree = degree;

38.    }

39.  

40. }

@ConfigurationProperties注解读取方式

1. @Component

2. @ConfigurationProperties(prefix ="info")

3. publicclassInfoConfig2{

4.  

5.    privateString address;

6.    privateString company;

7.    privateString degree;

8.  

9.    publicString getAddress(){

10.        return address;

11.    }

12.  

13.    publicvoid setAddress(String address){

14.        this.address = address;

15.    }

16.  

17.    publicString getCompany(){

18.        return company;

19.    }

20.  

21.    publicvoid setCompany(String company){

22.        this.company = company;

23.    }

24.  

25.    publicString getDegree(){

26.        return degree;

27.    }

28.  

29.    publicvoid setDegree(String degree){

30.        this.degree = degree;

31.    }

32.  

33. }

读取指定文件

资源目录下建立config/db-config.properties:

db.username=root

db.password=123456

@PropertySource+@Value注解读取方式

1. @Component

2. @PropertySource(value ={"config/db-config.properties"})

3. publicclassDBConfig1{

4.  

5.    @Value("${db.username}")

6.    privateString username;

7.  

8.    @Value("${db.password}")

9.    privateString password;

10.  

11.    publicString getUsername(){

12.        return username;

13.    }

14.  

15.    publicvoid setUsername(String username){

16.        this.username = username;

17.    }

18.  

19.    publicString getPassword(){

20.        return password;

21.    }

22.  

23.    publicvoid setPassword(String password){

24.        this.password = password;

25.    }

26.  

27. }

注意：@PropertySource不支持yml文件读取。

@PropertySource+@ConfigurationProperties注解读取方式

1. @Component

2. @ConfigurationProperties(prefix ="db")

3. @PropertySource(value ={"config/db-config.properties"})

4. publicclassDBConfig2{

5.  

6.    privateString username;

7.    privateString password;

8.  

9.    publicString getUsername(){

10.        return username;

11.    }

12.  

13.    publicvoid setUsername(String username){

14.        this.username = username;

15.    }

16.  

17.    publicString getPassword(){

18.        return password;

19.    }

20.  

21.    publicvoid setPassword(String password){

22.        this.password = password;

23.    }

24.  

25. }

Environment读取方式

以上所有加载出来的配置都可以通过Environment注入获取到。

1. @Autowired

2. privateEnvironment env;

3.  

4. // 获取参数

5. String getProperty(String key);

总结

从以上示例来看，Spring Boot可以通过@PropertySource,@Value,@Environment,@ConfigurationProperties来绑定变量