详解SpringBoot注解读取配置文件的方式

fileName=configName

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;

   }

}

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. SpringBoot Test;

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());

   }

}

database.username=root

database.password=root

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;

   }

}

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());

   }

}

fileName=configName

database.username=root

database.password=root

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;

   }

}

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

   }

}