Java Spring应用程序可以'；无法从属性源检索数据

我正在尝试使用Spring应用程序中的环境从application.properties文件检索数据，但它不起作用。我无法按环境正确绑定数据。只有使用如下所示的局部变量，我才能使其工作：

AppConfig.class现在

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories("com.victommasi.eshop.dao")
@PropertySource("classpath:application.properties")
public class AppConfig {

private static final String driverClass = "com.mysql.jdbc.Driver";
private static final String url = "jdbc:mysql://localhost/eshop";
private static final String username = "root";
private static final String password = "root";

private static final String dialect = "org.hibernate.dialect.MySQL5Dialect";
private static final String showSql = "true";
private static final String formatSql = "true";
private static final String hbm2dllAuto = "update";
private static final String packageToScan = "com.victommasi.eshop.model";


@Bean 
public DataSource dataSource(){
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName(driverClass);
    dataSource.setUrl(url);
    dataSource.setUsername(username);
    dataSource.setPassword(password);   
    return dataSource;
}

private Properties hibernateProperties() {
    Properties properties = new Properties();
    properties.put("hibernate.dialect", dialect);
    properties.put("hibernate.show_sql", showSql);
    properties.put("hibernate.format_sql", formatSql);
    properties.put("hibernate.hbm2ddl.auto", hbm2dllAuto);
    return properties;        
}


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

}

@Bean 
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPersistenceProvider(new HibernatePersistenceProvider());
        entityManagerFactoryBean.setPackagesToScan(packageToScan);
        entityManagerFactoryBean.setJpaProperties(hibernateProperties());
        return entityManagerFactoryBean;
}

 }

我想要的AppConfig.class

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories("com.victommasi.eshop.dao")
@PropertySource("classpath:application.properties")
public class AppConfig {

@Autowired
private Environment env;


@Bean 
public DataSource dataSource(){
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName(env.getProperty("jdbc.driverClass"));
    dataSource.setUrl(env.getProperty("jdbc.url"));
    dataSource.setUsername(env.getProperty("jdbc.username"));
    dataSource.setPassword(env.getProperty("jdbc.password"));   
    return dataSource;
}

private Properties hibernateProperties() {
    Properties properties = new Properties();
    properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
    properties.put("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
    properties.put("hibernate.format_sql", env.getProperty("hibernate.format_sql"));
    properties.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
    return properties;        
}


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

}

@Bean 
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPersistenceProvider(new HibernatePersistenceProvider());
        entityManagerFactoryBean.setPackagesToScan(env.getProperty("packages.to.scan"));
        entityManagerFactoryBean.setJpaProperties(hibernateProperties());
        return entityManagerFactoryBean;
}

其他类别：

网络配置类

@EnableWebMvc
@Configuration
@ComponentScan(basePackages = { "com.victommasi.eshop" })
public class WebConfig extends WebMvcConfigurerAdapter {

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
}

@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    configurer.enable();
}

@Bean
public InternalResourceViewResolver internalResourceViewResolver() {
    InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    resolver.setPrefix("/WEB-INF/views/");
    resolver.setContentType("text/html;charset=UTF-8");
    resolver.setSuffix(".jsp");
    return resolver;
}

@Bean(name = "filterMultipartResolver")
public CommonsMultipartResolver getMultipartResolver() {
    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
    multipartResolver.setMaxUploadSize(1048576);
    multipartResolver.setMaxInMemorySize(1048576);
    return multipartResolver;
}

 }

WebAppInitializer.class

public class WebAppInitializer implements WebApplicationInitializer {

@Override
public void onStartup(ServletContext container) throws ServletException {

    AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
    rootContext.register(WebConfig.class, AppConfig.class, SecurityConfig.class);

    container.addListener(new ContextLoaderListener(rootContext));

    AnnotationConfigWebApplicationContext dispatcherServlet = new AnnotationConfigWebApplicationContext();
    dispatcherServlet.register(WebConfig.class);

    ServletRegistration.Dynamic dispatcher = container.addServlet("dispatcher", new DispatcherServlet(dispatcherServlet));
    dispatcher.setLoadOnStartup(1);
    dispatcher.addMapping("/");
}

}

---

我知道这似乎很容易，我也遵循了这一点，但无法做到这一点

我没有全部介绍，但您似乎缺少了

属性资源占位符配置器
bean

自Spring3.1引入新的@PropertySource注释以来，作为
向环境中添加属性源的方便机制。
此注释将与基于Java的注释一起使用
配置和@configuration注释：

这样，您现在就可以开始使用
@Value
注释注入一个属性了。注释很简单：

@Value( "${jdbc.url}" )
private String jdbcUrl;

另一方面，请考虑/查看，您将免费获得以上所有内容（包括您共享的所有代码）以及更多内容，即零行代码。在阅读了一条评论后，我查看了控制台，发现“application.properties”文件中的数据是由环境以空格绑定到AppConfig.class的

堆栈跟踪：

Caused by: java.sql.SQLException: Access denied for user 'root      '@'localhost'

我想这就是装订不起作用的原因。我的应用程序现在可以正常工作了。谢谢。
请描述它不工作的情况。对
getProperty
的调用是否返回
null
？Spring是否抛出异常？你预期会发生什么？实际发生了什么？很抱歉没有很好地描述它。在阅读了您的评论后，我查看了控制台，发现“application.properties”文件中的数据绑定了空格，我认为这是绑定无法工作的原因。谢谢，但我希望使用环境，因为它是Spring推荐的。不确定您指的是哪种Spring，但最好是这样
Caused by: java.sql.SQLException: Access denied for user 'root      '@'localhost'