Spring boot injects values into static variables

question:

application.properties中配置下面两个配置项
ccb.ip.address=10.25.177.31
ccb.ip.port=1600
下面问题代码中读取不到application.properties配置文件中的配置

Problem code:

public class BISFrontFileUtil {
    private static Logger logger = LoggerFactory.getLogger(BISFrontFileUtil.class);
    @Value("${ccb.ip.address}")
    private static String CCBIPADDRESS;
    @Value("${ccb.ip.port}")
    private static int CCBIPPORT;

    public static boolean putFileToFront(String fileName, String fileContentStr) {
        boolean flag = false;
        try {
            String clientFlag = "in"; // in表示平安内部系统
            logger.info("建行新一代，上传到前置机的文件名：" + fileName + "，bis的IP地址：" + CCBIPADDRESS + "，端口号：" + CCBIPPORT);
            InputStream in = new ByteArrayInputStream(fileContentStr.getBytes("UTF-8"));
            ResultBean result = BankFileHandleServiceImp.sendBankStream(in,
                    fileContentStr.getBytes().length, fileName, CCBIPADDRESS, CCBIPPORT, clientFlag);
            String resultCode = result.getPA_RSLT_CODE();// 获取上传的结果
            String resultMsg = result.getPA_RSLT_MESG();
            if (resultCode.equals(ResultCodeUtil.CODE_999999)) {// 999999表示上传成功
                logger.info("建行新一代，上传前置机文件" + fileName + "成功");
                flag = true;
            } else {
                logger.info("建行新一代，上传前置机文件失败，失败代码：" + resultCode + ",失败信息：" + resultMsg);
            }
        } catch (Exception e) {
            logger.error("建行新一代上传前置机内容转换UTF-8的形式报错："+ e, e);
        }
        return flag;
    }
}

result:

运行后发现CCBIPADDRESS为null ，CCBIPPORT为0（int默认为0了）。

reason:

后来google发现spring boot不允许/不支持把值注入到静态变量中。

Correction method:

spring boot支持set方法注入，我们可以利用非静态set方法注入静态变量

Corrected code:

@Component
public class BISFrontFileUtil {
    private static Logger logger = LoggerFactory.getLogger(BISFrontFileUtil.class);

    private static String CCBIPADDRESS;

    private static int CCBIPPORT;

    @Value("${ccb.ip.address}")
    public void setCCBIPADDRESS(String cCBIPADDRESS) {
        CCBIPADDRESS = cCBIPADDRESS;
    }

    @Value("${ccb.ip.port}")
    public void setCCBIPPORT(int cCBIPPORT) {
        CCBIPPORT = cCBIPPORT;
    }

    /**
     * 上传文件至bis前置机
     * @param fileName
     * @param fileContentStr
     * @return
     */
    public static boolean putFileToFront(String fileName, String fileContentStr) {
        boolean flag = false;
        try {
            String clientFlag = "in"; // in表示平安内部系统
            logger.info("建行新一代，上传到前置机的文件名：" + fileName + "，bis的IP地址：" + CCBIPADDRESS + "，端口号：" + CCBIPPORT);
            InputStream in = new ByteArrayInputStream(fileContentStr.getBytes("UTF-8"));
            ResultBean result = BankFileHandleServiceImp.sendBankStream(in,
                    fileContentStr.getBytes().length, fileName, CCBIPADDRESS, CCBIPPORT, clientFlag);
            String resultCode = result.getPA_RSLT_CODE();// 获取上传的结果
            String resultMsg = result.getPA_RSLT_MESG();
            if (resultCode.equals(ResultCodeUtil.CODE_999999)) {// 999999表示上传成功
                logger.info("建行新一代，上传前置机文件" + fileName + "成功");
                flag = true;
            } else {
                logger.info("建行新一代，上传前置机文件失败，失败代码：" + resultCode + ",失败信息：" + resultMsg);
            }
        } catch (Exception e) {
            logger.error("建行新一代上传前置机内容转换UTF-8的形式报错："+ e, e);
        }
        return flag;
    }
}

Notice:

1、 修正代码中的@Component不可丢掉了
2、 set方法要是非静态的