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Дмитрий's questions

Martin Hope
Дмитрий
Asked: 2020-01-24 09:08:45 +0000 UTC
  • 1

今天是个好日子！使用反射时遇到了这样一个有趣的问题。有没有办法在Java中实现这个方法：

private <T extends OdooModel> T[] parseRequest(Class<T> clazz) {
...
return new Gson().fromJson(model, clazz);//здесь неправильный аргумент clazz
}

问题是在调用方法的时候，我需要传递Model.class，而不是Model[].class，反过来，对于解析器，我需要传递Model[].class。那些。事实上，我们有一个 Class clazz = Model.class 变量，我们想从中获取 Сlass clazz = Model[].class 变量。

谢谢

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Martin Hope
Дмитрий
Asked: 2020-10-31 02:53:13 +0000 UTC
  • 1

如何在不从上下文创建服务类实例的情况下使 Autowired 工作？我使用没有 Spring Booth 的 Spring Date。配置类：

@Configuration
@EnableJpaRepositories
public class SpringConfig {

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();

        dataSource.setDriverClassName(com.mysql.jdbc.Driver.class.getName());
        dataSource.setUrl("jdbc:mysql://localhost:3306/kvi?useSSL=false");
        dataSource.setUsername("");
        dataSource.setPassword("");
        return dataSource;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {

        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
        entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());

        entityManagerFactoryBean.setJpaProperties(hibProperties());
        entityManagerFactoryBean.setPackagesToScan("repository", "models");

        return entityManagerFactoryBean;

    }

    private Properties hibProperties() {
        Properties jpaProperties = new Properties();
        jpaProperties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
        jpaProperties.setProperty("hibernate.hbm2ddl.auto", "update");

        jpaProperties.setProperty("hibernate.connection.useUnicode", "true");
        jpaProperties.setProperty("hibernate.connection.characterEncoding", "UTF-8");
        return jpaProperties;
    }

    @Bean
    public JpaTransactionManager transactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
        return transactionManager;
    }

}

存储库：

@Repository
public interface PersonRepository extends CrudRepository<Person, Long>{
}

这是服务：

@Service
@Transactional
public class PersonService {

    @Autowired
    private PersonRepository personRepository;

    public Iterable<Person> findAll () {
        return personRepository.findAll();
    }
}

好吧，分别有一个 Person 实体（我不会列出）。从主类启动：

@ComponentScan
public class Main {
    public static void main(String[] args) {

        ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
        AutowireCapableBeanFactory autowireCapableBeanFactory = context.getAutowireCapableBeanFactory();
        PersonService ps = autowireCapableBeanFactory.createBean(PersonService.class);

        List <Person> pers = new ArrayList <>();
        Iterable<Person> findAll = ps.findAll();
        CollectionUtils.addAll(pers, findAll);
        for (Person p : pers) {
            System.out.println(p);
        }
    }
}

一切都很完美。但问题是每次通过上下文获取服务，如代码( PersonService ps = autowireCapableBeanFactory.createBean(PersonService.class);)所示，说白了就是不方便。

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