详解SpringBoot注解读取配置文件的方式

一、@Value读取application.properties配置文件中的值

application.properties配置文件

				?

									fileName=configName

PropertiesConfig类文件

									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

									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

				?

									database.username=root

									database.password=root

DatabaseConfig类文件

				?

									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

				?

									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

				?

									fileName=configName

									database.username=root

									database.password=root

PropertySourceConfig类文件

				?

									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

				?

									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

									  }

									}