自定义类的Spring@Value属性

是否可以使用Spring的@Value注释来读取和写入自定义类类型的属性值

例如：

@Component
@PropertySource("classpath:/data.properties")
public class CustomerService {

    @Value("${data.isWaiting:#{false}}")
    private Boolean isWaiting;

    // is this possible for a custom class like Customer???
    // Something behind the scenes that converts Custom object to/from property file's string value via an ObjectFactory or something like that?
    @Value("${data.customer:#{null}}")
    private Customer customer;

    ...
}

已编辑的解决方案

下面是我如何使用Spring4.xapi实现的

为客户类创建了新的PropertyEditorSupport类：

public class CustomerPropertiesEditor extends PropertyEditorSupport {

    // simple mapping class to convert Customer to String and vice-versa.
    private CustomerMap map;

    @Override
    public String getAsText() 
    {
        Customer customer = (Customer) this.getValue();
        return map.transform(customer);
    }

    @Override
    public void setAsText(String text) throws IllegalArgumentException 
    {
        Customer customer = map.transform(text);
        super.setValue(customer);
    }
}

然后在应用程序的ApplicationConfig类中：

@Bean
public CustomEditorConfigurer customEditorConfigurer() {

    Map<Class<?>, Class<? extends PropertyEditor>> customEditors = 
            new HashMap<Class<?>, Class<? extends PropertyEditor>>(1);
    customEditors.put(Customer.class, CustomerPropertiesEditor.class);

    CustomEditorConfigurer configurer = new CustomEditorConfigurer();
    configurer.setCustomEditors(customEditors);

    return configurer;
}

@Bean
public CustomEditorConfigurer customEditorConfigurer() {

    Map<Class<?>, Class<? extends PropertyEditor>> customEditors = 
            new HashMap<Class<?>, Class<? extends PropertyEditor>>(1);
    customEditors.put(Customer.class, CustomerPropertiesEditor.class);
    customEditors.put(Customer[].class, CustomerPropertiesEditor.class);

    CustomEditorConfigurer configurer = new CustomEditorConfigurer();
    configurer.setCustomEditors(customEditors);

    return configurer;
}

@Bean
public CustomEditorConfigurer CustomEditorConfigurer（）{
Map，Class这是可能的，但是阅读Spring文档。您可以看到以下示例：
示例用法

 @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;
     }
 }

请参阅详细信息
您必须创建一个扩展
属性编辑器支持的类

public class CustomerEditor extends PropertyEditorSupport {
  @Override
  public void setAsText(String text) {
    Customer c = new Customer();
    // Parse text and set customer fields...
    setValue(c);
  }
}

Spring可以读取属性并将它们直接加载到类中。

此外，通过使代码更干净，您可以在类的顶部添加，而不是逐个连接每个嵌套属性

鉴于上述情况，下面是最后一个示例，并给出了解释：

// File: CustomerConfig.java
@Configuration
// Set property source file path (optional)
@PropertySource("classpath:/data.properties")
// Put prefix = "data" here so that Spring read properties under "data.*"
@ConfigurationProperties(prefix = "data") 
public class CustomerConfig {
    // Note: Property name here is the same as in the file (data.customer)
    // Spring will automatically read and put "data.customer.*" properties into this object
    private Customer customer; 

    // Other configs can be added here too... without wiring one-by-one

    public setCustomer(Customer customer){
        this.customer = customer;
    }

    public getCustomer(){
        return this.customer;
    }
}

就是这样，现在您有了“data.customer.*”属性，可以通过CustomerConfig.getCustomer（）加载和访问


要将其集成到您的服务中（基于示例代码）：

这样，将配置读入类就不需要“魔法破解”。
请查看文档/示例，并从中获取更多有用的信息


注意：我建议不要使用PropertyEditorSupport，因为

a） 它是为不同的目的而构建的，将来可能会因破坏代码而改变

b） 它需要手动“处理”内部代码=>可能的错误

取而代之的是，使用为这个目的而构建的东西（Spring已经拥有了它），以便使代码更容易理解，并获得可能在将来（或现在）进行的内部改进/优化

进一步改进：您的CustomerService似乎也充斥着配置（@PropertyService）。我建议您也通过另一个类读取这些属性（类似）然后在这里连接该类，而不是在CustomerService中执行所有操作。
如果您想将其与列表一起使用，可以使用array替代

将您的属性定义为Customer[]而不是List，然后：

在ApplicationConfig类中：

@Bean
public CustomEditorConfigurer customEditorConfigurer() {

    Map<Class<?>, Class<? extends PropertyEditor>> customEditors = 
            new HashMap<Class<?>, Class<? extends PropertyEditor>>(1);
    customEditors.put(Customer.class, CustomerPropertiesEditor.class);

    CustomEditorConfigurer configurer = new CustomEditorConfigurer();
    configurer.setCustomEditors(customEditors);

    return configurer;
}

@Bean
public CustomEditorConfigurer customEditorConfigurer() {

    Map<Class<?>, Class<? extends PropertyEditor>> customEditors = 
            new HashMap<Class<?>, Class<? extends PropertyEditor>>(1);
    customEditors.put(Customer.class, CustomerPropertiesEditor.class);
    customEditors.put(Customer[].class, CustomerPropertiesEditor.class);

    CustomEditorConfigurer configurer = new CustomEditorConfigurer();
    configurer.setCustomEditors(customEditors);

    return configurer;
}

谢谢Efe。这就是我一直在寻找的。我正在编辑我的第一篇文章以展示完整的解决方案。有没有办法为类型
列表指定自定义编辑器？