详解SpringBoot注解读取配置文件的方式

冷不防 2022-10-29 07:51 232阅读 0赞

一、@Value读取application.properties配置文件中的值  
application.properties配置文件  
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fileName=configName  
PropertiesConfig类文件  
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import org.springframework.beans.factory.annotation.Value;  
import org.springframework.stereotype.Component;  
  
@Component  
public class PropertiesConfig \{  
//通过@Value注解读取fileName的值  
@Value("$\{fileName\}")  
private String fileName;  
  
public String getFileName() \{  
return fileName;  
\}  
  
public void setFileName(String fileName) \{  
this.fileName = fileName;  
\}  
\}  
测试  
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import com.model.PropertiesConfig;  
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;  
  
@RunWith(SpringRunner.class)  
@SpringBootTest  
public class PropertiesConfigTest \{  
@Autowired  
private PropertiesConfig propertiesConfig;  
@Test  
public void test()\{  
System.out.println(propertiesConfig.getFileName());//结果输出：configName  
assert "configName".equals(propertiesConfig.getFileName());  
\}  
\}  
二、@ConfigurationProperties读取多个application.properties配置文件中的值  
application.properties文件  
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database.username=root  
database.password=root  
DatabaseConfig类文件  
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import org.springframework.boot.context.properties.ConfigurationProperties;  
import org.springframework.stereotype.Component;  
  
@Component  
@ConfigurationProperties("database")  
public class DatabaseConfig \{  
private String userName;  
private String passWord;  
  
public String getUserName() \{  
return userName;  
\}  
  
public void setUserName(String userName) \{  
this.userName = userName;  
\}  
  
public String getPassWord() \{  
return passWord;  
\}  
  
public void setPassWord(String passWord) \{  
this.passWord = passWord;  
\}  
\}  
测试  
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import com.model.DatabaseConfig;  
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;  
  
@RunWith(SpringRunner.class)  
@SpringBootTest  
public class DatabaseConfigTest \{  
@Autowired  
private DatabaseConfig databaseConfig;  
@Test  
public void test()\{  
System.out.println("username = " + databaseConfig.getUserName() +", password = "+databaseConfig.getPassWord());//结果输出：username = root, password = root  
assert "root".equals(databaseConfig.getUserName());  
assert "root".equals(databaseConfig.getPassWord());  
\}  
\}  
三、@PropertySource读取任意配置文件  
新建property-source.properties配置文件  
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fileName=configName  
database.username=root  
database.password=root  
PropertySourceConfig类文件  
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import org.springframework.beans.factory.annotation.Value;  
import org.springframework.boot.context.properties.ConfigurationProperties;  
import org.springframework.context.annotation.PropertySource;  
import org.springframework.stereotype.Component;  
  
@Component  
@PropertySource(value = \{"classpath:property-source.properties"\})  
@ConfigurationProperties("database")  
public class PropertySourceConfig \{  
@Value("$\{fileName\}")  
private String fileName;  
private String userName;  
private String passWord;  
  
public String getFileName() \{  
return fileName;  
\}  
  
public void setFileName(String fileName) \{  
this.fileName = fileName;  
\}  
  
public String getUserName() \{  
return userName;  
\}  
  
public void setUserName(String userName) \{  
this.userName = userName;  
\}  
  
public String getPassWord() \{  
return passWord;  
\}  
  
public void setPassWord(String passWord) \{  
this.passWord = passWord;  
\}  
\}  
测试  
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import com.model.PropertySourceConfig;  
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;  
  
@RunWith(SpringRunner.class)  
@SpringBootTest  
public class PropertySourceConfigTest \{  
  
@Autowired  
private PropertySourceConfig propertySourceConfig;  
  
@Test  
public void test()\{  
assert "configName".equals(propertySourceConfig.getFileName());  
System.out.println("fileName = " + propertySourceConfig.getFileName());//结果输出：configName  
assert "root".equals(propertySourceConfig.getUserName());  
System.out.println(propertySourceConfig.getUserName());//结果输出：root  
assert "root".equals(propertySourceConfig.getPassWord());  
System.out.println(propertySourceConfig.getPassWord());//结果输出：root  
\}  
\}  
完整代码链接：read-config-file项目地址

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