SpringBoot属性注入的两种方法
1、实现方式一:Spring中的@PropertySource
@Component @PropertySource("classpath:user.properties") publicclassUserInfo{ @Value("${user.username}") privateStringusername; @Value("${user.password}") privateStringpassword; @Value("${user.age}") privateIntegerage; @Override publicStringtoString(){ return"UserInfo{"+ "username='"+username+'\''+ ",password='"+password+'\''+ ",age="+age+ '}'; } }
配置文件中:
user.username='admin' user.password='123' user.age=88
测试:
@SpringBootTest publicclassUserInfoTest{ @Autowired UserInfouserInfo; @Test publicvoiduser(){ System.out.println(userInfo.toString()); } }
结果:
UserInfo{username=''admin'',password=''123'',age=88}
注意:此方法是不安全的,如果在配置文件中找不到对应的属性,例如没有username属性,会报错如下:
java.lang.IllegalStateException:FailedtoloadApplicationContext Causedby:org.springframework.beans.factory.BeanCreationException:Errorcreatingbeanwithname'userInfo':Injectionofautowireddependenciesfailed;nestedexceptionisjava.lang.IllegalArgumentException:Couldnotresolveplaceholder'user.username'invalue"${user.username}"
2、实现方式二:通过SpringBoot特有的@ConfigurationProperties来实现
注意点:需要getter、setter函数
@Component @PropertySource("classpath:user.properties") @ConfigurationProperties(prefix="user") publicclassUserInfo{ //@Value("${user.username}") privateStringusername; //@Value("${user.password}") privateStringpassword; //@Value("${user.age}") privateIntegerage; publicStringgetUsername(){ returnusername; } publicStringgetPassword(){ returnpassword; } publicvoidsetPassword(Stringpassword){ this.password=password; } publicIntegergetAge(){ returnage; } publicvoidsetAge(Integerage){ this.age=age; } publicvoidsetUsername(Stringusername){ this.username=username; } @Override publicStringtoString(){ return"UserInfo{"+ "username='"+username+'\''+ ",password='"+password+'\''+ ",age="+age+ '}'; } }
这种方法比较安全,即使配置文件中没有对于属性,也不会抛出异常。
以上就是SpringBoot属性注入的两种方法的详细内容,更多关于SpringBoot属性注入的资料请关注毛票票其它相关文章!