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：

@SpringBootTestpublic 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 ApplicationContextCaused 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其它相关文章！