Springboot中@Value注解的场景用法及可能遇到的问题详解

@Value("admin")
private String name;

@Value("#{systemProperties['os.name']}")
private String osName;

@Value("#{User.userName}")
private String userName;

@Value("classpath:com/ndtest/spring/configinject/config.txt")
private Resource resourceFile;

@Value("http://www.baidu.com")
private Resource testUrl;

userName=zhaoyp

@Value("${userName}")
public String userName;

client:
  ipAddr: 222.95.84.124
  sshPort: 22
  sshUser: root
  sshPass: Test!@#123

    @Value("${client.ipAddr}")
    private String ipAddr;

    @Value("${client.sshPort}")
    private Integer sshPort;

    @Value("${client.sshUser}")
    private String sshUser;

    @Value("${client.sshPass}")
    private String sshPass;

ids=1,2,3

// 注入数组类型
@Value("${ids}")
public int[] arrIds;

// 注入List
@Value("#{'${ids}'.split(',')}")
public List<String> listIds;

@Value("${ftpIP}")
private static String ftpIP; 

@Value("${ftpUserName}")
private final String ftpUserName;

public class FTPManagerService { 
 @Value("${ftpIP}")
 private static String ftpIP; 
}

@Component // 检查注解是否遗漏
public class FTPManagerService { 
 @Value("${ftpIP}")
 private static String ftpIP; 
}

public class FTPManagerService { 
 @Value("${ftpIP}")
 private static String ftpIP; 
} 

public class Test{
    /*错误用法*/
    FTPManagerService  f = new FTPManagerService ();
 
    /*正确用法*/
    @Autowired
    FTPManagerService  f2;
}