bean中的Spring JavaConfig属性没有设置？ [英] Spring JavaConfig properties in bean is not getting set?

问题描述

我正在考虑使用Spring JavaConfig和一些属性文件，但bean中的属性没有设置？bean中的属性没有设置？

I am looking at using Spring JavaConfig with some property files but properties in bean is not getting set?in bean is not getting set?

这是我的WebConfig：

Here is my WebConfig:

@Configuration
@EnableWebMvc
@PropertySource(value = "classpath:application.properties")
@Import(DatabaseConfig.class)
@ImportResource("/WEB-INF/applicationContext.xml")
public class WebMVCConfig extends WebMvcConfigurerAdapter {

    private static final String MESSAGE_SOURCE = "/WEB-INF/classes/messages";

    private static final Logger logger = LoggerFactory.getLogger(WebMVCConfig.class);

    @Value("${rt.setPassword}")
    private String RTPassword;

    @Value("${rt.setUrl}")
    private String RTURL;

    @Value("${rt.setUser}")
    private String RTUser;


    @Bean
    public  ViewResolver resolver() {
        UrlBasedViewResolver url = new UrlBasedViewResolver();
        url.setPrefix("/WEB-INF/view/");
        url.setViewClass(JstlView.class);
        url.setSuffix(".jsp");
        return url;
    }


    @Bean(name = "messageSource")
    public MessageSource configureMessageSource() {
        logger.debug("setting up message source");
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename(MESSAGE_SOURCE);
        messageSource.setCacheSeconds(5);
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }

    @Bean
    public LocaleResolver localeResolver() {
        SessionLocaleResolver lr = new SessionLocaleResolver();
        lr.setDefaultLocale(Locale.ENGLISH);
        return lr;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        logger.debug("setting up resource handlers");
        registry.addResourceHandler("/resources/").addResourceLocations("/resources/**");
    }

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

    @Override
    public void addInterceptors(final InterceptorRegistry registry) {
        registry.addInterceptor(new LocaleChangeInterceptor());
    }

    @Bean
    public SimpleMappingExceptionResolver simpleMappingExceptionResolver() {
        SimpleMappingExceptionResolver b = new SimpleMappingExceptionResolver();

        Properties mappings = new Properties();
        mappings.put("org.springframework.web.servlet.PageNotFound", "p404");
        mappings.put("org.springframework.dao.DataAccessException", "dataAccessFailure");
        mappings.put("org.springframework.transaction.TransactionException", "dataAccessFailure");
        b.setExceptionMappings(mappings);
        return b;
    }

    @Bean
    public RequestTrackerConfig requestTrackerConfig()
    {
        RequestTrackerConfig tr = new RequestTrackerConfig();
        tr.setPassword(RTPassword);
        tr.setUrl(RTURL);
        tr.setUser(RTUser);

        return tr;
    }


}

tr.url中的值是rt.setUrl而不是application.properties中的值？

推荐答案

我不是100％，但我认为你的 @PropertySource 是不对的。而不是

I'm not 100%, but I think your @PropertySource isn't quite right. Instead of

@PropertySource（value =classpath：application.properties）

它应该是：

@PropertySource（classpath：application.properties）

基于此：

Spring PropertySource文档

此外，根据上面的链接，因为你提到你转换为java配置方法而不是xml，我认为以下可能是你的问题的解决方案：

Also, based on the link above and since you have mentioned you were converting to a java config approach instead of xml, I think the below might be the solution to your issue:

解决$ {...}占位符和@Value注释
命令解析定义中的$ {...}占位符或使用@Value
注释PropertySource中的属性，必须注册
a PropertySourcesPlaceholderConfigurer。当在XML中使用时，这会自动发生
，但在使用
@Configuration类时，必须使用静态@Bean方法显式注册
。有关
的详细信息和示例，请参阅@Bean Javadoc的使用外部化值
部分的@Configuration Javadoc和关于
BeanFactoryPostProcessor返回@Bean方法的说明。

Resolving ${...} placeholders in and @Value annotations In order to resolve ${...} placeholders in definitions or @Value annotations using properties from a PropertySource, one must register a PropertySourcesPlaceholderConfigurer. This happens automatically when using in XML, but must be explicitly registered using a static @Bean method when using @Configuration classes. See the "Working with externalized values" section of @Configuration Javadoc and "a note on BeanFactoryPostProcessor-returning @Bean methods" of @Bean Javadoc for details and examples.

以上链接中的示例是我通常的做法：

The example from the link above is how I normally do it:

 @Configuration
 @PropertySource("classpath:/com/myco/app.properties")
 public class AppConfig {
     @Autowired
     Environment env;

     @Bean
     public TestBean testBean() {
         TestBean testBean = new TestBean();
         testBean.setName(env.getProperty("testbean.name"));
         return testBean;
    }
 }

所以在顶部添加：

@Autowired
Environment env;

然后在你的方法中使用：

Then in your method use:

tr.setPassword(env.getProperty("rt.setPassword"));

等等剩余属性值。我对你的做法并不熟悉。我知道上述方法可行。

and so on for the remaining property values. I am just not as familiar with the way you are doing it. I know the above approach will work though.

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