Question:

The following two configuration items are configured in application.properties
ccb.ip.address=10.25.177.31
ccb.ip.port=1600
 The configuration in the application.properties configuration file cannot be read in the following problem code

Question 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 for ping an internal system
            logger.info("For the new generation of CCB, the file name uploaded to the front-end computer:" + fileName + "，bis Of IP Address:" + CCBIPADDRESS + "，Port number:" + 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();// Get uploaded results
            String resultMsg = result.getPA_RSLT_MESG();
            if (resultCode.equals(ResultCodeUtil.CODE_999999)) {// 999999 indicates successful upload
                logger.info("CCB new generation, upload front-end file" + fileName + "Success");
                flag = true;
            } else {
                logger.info("CCB new generation failed to upload the front-end file, failure code:" + resultCode + ",Failure information:" + resultMsg);
            }
        } catch (Exception e) {
            logger.error("CCB new generation upload front-end content conversion UTF-8 Form error:"+ e, e);
        }
        return flag;
    }
}

Result:

After running, it was found that CCBIPADDRESS was null and CCBIPPORT was 0 (int was 0 by default).

Reason:

Later, google found that spring boot did not allow / support injecting values into static variables.

Correction method:

spring boot supports set method injection. We can inject static variables with non static set method

Correction 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;
    }

    /**
     * Upload files to bis front end
     * @param fileName
     * @param fileContentStr
     * @return
     */
    public static boolean putFileToFront(String fileName, String fileContentStr) {
        boolean flag = false;
        try {
            String clientFlag = "in"; // in for ping an internal system
            logger.info("For the new generation of CCB, the file name uploaded to the front-end computer:" + fileName + "，bis Of IP Address:" + CCBIPADDRESS + "，Port number:" + 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();// Get uploaded results
            String resultMsg = result.getPA_RSLT_MESG();
            if (resultCode.equals(ResultCodeUtil.CODE_999999)) {// 999999 indicates successful upload
                logger.info("CCB new generation, upload front-end file" + fileName + "Success");
                flag = true;
            } else {
                logger.info("CCB new generation failed to upload the front-end file, failure code:" + resultCode + ",Failure information:" + resultMsg);
            }
        } catch (Exception e) {
            logger.error("CCB new generation upload front-end content conversion UTF-8 Form error:"+ e, e);
        }
        return flag;
    }
}

Be careful:

1. Fix @ Component in code not to be lost
 2. If the set method is not static