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具有字符串构造函数的Spring Boot-自动布线服务

autowired spring-boot

Jigar Naik · 技术社区 · 7 年前

我该怎么办 @autowire TransactionManagerImpl 它具有1(字符串)参数构造函数,而不使用 new 在spring boot应用程序中? autowire 不使用 新的

自动装配 TransactionManager 在三个不同的类中,参数在所有三个类中都是不同的。

这看起来很基本。

@Service
public class TransactionManagerImpl implements TransactionManager {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    String txnLogFile;

    @ConstructorProperties({"txnLogFile"})
    public TransactionManagerImpl(String txnLogFile) {
        this.txnLogFile= txnLogFile; 
    }

}

0 回复 | 直到 7 年前

Raghvendra Garg 7 年前

您想在哪里使用@Service annotation有什么特殊要求吗?

@Configuration
public class Config {

@Value("${txnLogFile}")
private String txnLogFile;

@Bean
public TransactionManager transactionManager() {
    return new TransactionManagerImpl(txnLogFile);
 }

}

并从TransactionManagerImpl中删除@Service注释。

Antoniossss 7 年前

抛开其他的并发症不谈,可以这样做

public TransactionManagerImpl(@Value("${txnLogFile}") String txnLogFile) {
    this.txnLogFile= txnLogFile; 
}

Jigar Naik 7 年前

应用程序.yaml

app:
   type-a:
      txn-log-file: data/type-a-txn-info.csv
   type-b:
      txn-log-file: data/type-b-txn-info.csv
   default: 
      txn-log-file: data/default/txn-info.csv

主应用程序.java

@SpringBootApplication
public class MainApplication {

    public static void main(String[] args) {
        new SpringApplicationBuilder(MainApplication.class).web(WebApplicationType.NONE).run(args);
    }

    @Bean
    public TransactionManager transactionManager(@Value("${app.default.txn-log-file}") String txnLogFile) {
        return new TransactionManagerImpl(txnLogFile);
    }

    @Bean
    public CsvService csvService(String txnLogFile) {
        return new CsvServiceImpl(txnLogFile);
    }
}

TypeOneRoute.java

@Configuration
public class TypeOneRoute extends RouteBuilder {

    @Value("${app.type-a.txn-log-file}")
    private String txnLogFile;

    @Autowired
    private ApplicationContext applicationContext;

    private TransactionManager transactionManager;

    @Override
    public void configure() throws Exception {
        transactionManager = applicationContext.getBean(TransactionManager.class, txnLogFile);
        transactionManager.someOperation();

    }
}

@Configuration
public class TypeTwoRoute extends RouteBuilder {

    @Value("${app.type-b.txn-log-file}")
    private String txnLogFile;

    @Autowired
    private ApplicationContext applicationContext;

    private TransactionManager transactionManager;

    @Override
    public void configure() throws Exception {
        transactionManager = applicationContext.getBean(TransactionManager.class, txnLogFile);
        transactionManager.create();

    }
}

事务管理器.java

@Service
@Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public interface TransactionManager {

    public ZonedDateTime create() throws IOException, ParseException;

}

事务管理器impl.java

public class TransactionManagerImpl implements TransactionManager {

    @Autowired
    private ApplicationContext applicationContext;

    private String txnLogFile;

    public TransactionManagerImpl(String txnLogFile) {
        this.txnLogFile = txnLogFile;
    }

    private CsvService csvService;

    @PostConstruct
    public void init() {
        csvService = applicationContext.getBean(CsvService.class, txnLogFile);
    }

    public ZonedDateTime create() throws IOException, ParseException {
        try {
            csvService.createTxnInfoFile();
            return csvService.getLastSuccessfulTxnTimestamp();
        } catch (IOException e) {
            throw new IOException("Exception occured in getTxnStartDate()", e);
        }
    }

}

最初,TransactionManager Bean将注册到 app.default.txn-info.csv ApplicationContext 我用传递来获取bean的参数替换该值