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;@Componentpublic 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)@SpringBootTestpublic 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=rootdatabase.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)@SpringBootTestpublic 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=configNamedatabase.username=rootdatabase.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)@SpringBootTestpublic 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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