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解读spring中@Value 如何将配置转自定义的bean

news 2025/8/6 10:58:05

实现方式

着急寻求解决方式的猿友先看这块

定义配置转化类

public class UserConverter implements Converter<String, List<User>> {@Overridepublic List<User> convert(String config) {if (StringUtils.isEmpty(config)) {return Collections.emptyList();}return JsonUtil.fromJson(config, new TypeReference<List<User>>() {});}}

将转化类放入转化工厂


@Configuration
public class ConverterConfiguration {@Beanpublic ConversionServiceFactoryBean conversionService() {ConversionServiceFactoryBean factoryBean = new ConversionServiceFactoryBean();factoryBean.setConverters(Sets.newHashSet(new UserConverter()));return factoryBean;}
}

属性注入

@Service
public class UserService{@Value("${userConfig:[]}")
private List<User> users;
}

spring在bean生命周期的属性赋值中，会根据属性的类型，匹配相应的转化类，执行转化，进而赋值。

代码改进

不难看出，这些转化类仅执行转化逻辑，不存在线程安全问题，可以将其放入spring的IOC中，关闭对ConverterConfiguration的修改。代码简化如下：


@Configuration
public class ConverterConfiguration {// 收集自定义的配置解析工具类@Resourceprivate Set<Converter> converters;@Beanpublic ConversionServiceFactoryBean conversionService() {ConversionServiceFactoryBean factoryBean = new ConversionServiceFactoryBean();factoryBean.setConverters(converters);return factoryBean;}
}@Component
public class UserConverter implements Converter<String, List<User>> {@Overridepublic List<User> convert(String config) {if (StringUtils.isEmpty(config)) {return Collections.emptyList();}return JsonUtil.fromJson(config, new TypeReference<List<User>>() {});}}