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
importorg.springframework.beans.factory.annotation.Value;
importorg.springframework.stereotype.Component;
@Component
publicclassPropertiesConfig{
//通过@Value注解读取fileName的值
@Value("${fileName}")
privateStringfileName;
publicStringgetFileName(){
returnfileName;
}
publicvoidsetFileName(StringfileName){
this.fileName=fileName;
}
}
测试
importcom.model.PropertiesConfig;
importorg.junit.Test;
importorg.junit.runner.RunWith;
importorg.springframework.beans.factory.annotation.Autowired;
importorg.springframework.boot.test.context.SpringBootTest;
importorg.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
publicclassPropertiesConfigTest{
@Autowired
privatePropertiesConfigpropertiesConfig;
@Test
publicvoidtest(){
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
importorg.springframework.boot.context.properties.ConfigurationProperties;
importorg.springframework.stereotype.Component;
@Component
@ConfigurationProperties("database")
publicclassDatabaseConfig{
privateStringuserName;
privateStringpassWord;
publicStringgetUserName(){
returnuserName;
}
publicvoidsetUserName(StringuserName){
this.userName=userName;
}
publicStringgetPassWord(){
returnpassWord;
}
publicvoidsetPassWord(StringpassWord){
this.passWord=passWord;
}
}
测试
importcom.model.DatabaseConfig;
importorg.junit.Test;
importorg.junit.runner.RunWith;
importorg.springframework.beans.factory.annotation.Autowired;
importorg.springframework.boot.test.context.SpringBootTest;
importorg.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
publicclassDatabaseConfigTest{
@Autowired
privateDatabaseConfigdatabaseConfig;
@Test
publicvoidtest(){
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
importorg.springframework.beans.factory.annotation.Value;
importorg.springframework.boot.context.properties.ConfigurationProperties;
importorg.springframework.context.annotation.PropertySource;
importorg.springframework.stereotype.Component;
@Component
@PropertySource(value={"classpath:property-source.properties"})
@ConfigurationProperties("database")
publicclassPropertySourceConfig{
@Value("${fileName}")
privateStringfileName;
privateStringuserName;
privateStringpassWord;
publicStringgetFileName(){
returnfileName;
}
publicvoidsetFileName(StringfileName){
this.fileName=fileName;
}
publicStringgetUserName(){
returnuserName;
}
publicvoidsetUserName(StringuserName){
this.userName=userName;
}
publicStringgetPassWord(){
returnpassWord;
}
publicvoidsetPassWord(StringpassWord){
this.passWord=passWord;
}
}
测试
importcom.model.PropertySourceConfig;
importorg.junit.Test;
importorg.junit.runner.RunWith;
importorg.springframework.beans.factory.annotation.Autowired;
importorg.springframework.boot.test.context.SpringBootTest;
importorg.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
publicclassPropertySourceConfigTest{
@Autowired
privatePropertySourceConfigpropertySourceConfig;
@Test
publicvoidtest(){
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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