详解SpringBoot注解读取配置文件的方式

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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