1、实现方式一:Spring中的@PropertySource @Component@PropertySource("classpath:user.properties")public class UserInfo { @Value("${user.username}") private String username; @Value("${user.password}") private String password; @Value("
1、实现方式一:Spring中的@PropertySource
@Component @PropertySource("classpath:user.properties") public class UserInfo { @Value("${user.username}") private String username; @Value("${user.password}") private String password; @Value("${user.age}") private Integer age; @Override public String toString() { return "UserInfo{" + "username='" + username + '\'' + ", password='" + password + '\'' + ", age=" + age + '}'; } }
配置文件中:
user.username='admin' user.password='123' user.age=88
测试:
@SpringBootTest public class UserInfoTest { @Autowired UserInfo userInfo; @Test public void user(){ System.out.println(userInfo.toString()); } }
结果:
UserInfo{username=''admin'', password=''123'', age=88}
注意:此方法是不安全的,如果在配置文件中找不到对应的属性,例如没有username属性,会报错如下:
java.lang.IllegalStateException: Failed to load ApplicationContext Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userInfo': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'user.username' in value "${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") public class UserInfo { // @Value("${user.username}") private String username; // @Value("${user.password}") private String password; // @Value("${user.age}") private Integer age; public String getUsername() { return username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public void setUsername(String username) { this.username = username; } @Override public String toString() { 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易盾网络其它相关文章!