SpringBoot中如何详细解读配置文件中的各项参数？

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java

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

配置文件：application.properties内容：fileName=configName

类文件：PropertiesConfig.javaimport org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;

@Componentpublic class PropertiesConfig { @Value(${fileName}) private String configName;}

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 } }

完整代码链接：read-config-file项目地址

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