[Spring Annotation] @PostConstrcut, @PreDestroy

@PostConstruct

자바 구성(@Configuration) Class 외부에 POJO Class를 정의(@Component) 할 경우 사용합니다. @Bean(initMethod="${methodName}"와 같은 동작을 하게 됩니다.

@PreDestory

자바 구성(@Configuration) Class 외부에 POJO Class를 정의(@Component) 할 경우 사용합니다. @Bean(destoryMethod="${methodName}"와 같은 동작을 하게 됩니다.

@Component
public Class Cashier {

    @Value("checkout")
    private String fileName;
    @Value("HOME/user/Temp/cashier")
    private String path;
    private BufferedWriter writer;

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    public void setPath(String path) {
        this.path = path;
    }

    @PostConstruct
    public void openFile() throws IOException {
        File targetDir = new File(path);

        if(!targetDir.exists()) {
            targetDir.mkdir();
        }

        File checkoutFile = new File(path, fileName + ".txt");

        if(!checkoutFile.exists()) {
            checkoutFile.createNewFile();
        }

        writer = new BufferedWriter(new OutputStreamWiter(new FileOutputStream(checkoutFile, true)));
    }

    public void checkout(ShoppingCart cart) throws IOEception {
        writer.write(new Date() + "\t" + cart.getItems() + "\r\n");
        writer.flush();
    }

    @PreDestory
    public void closeFile() throws IOEception {
        writer.close();
    }
}