如何用spring从属性文件加载映射

Question

try.map= one=1,\
two=2

@org.springframework.beans.factory.annotation.Value("${try.map}")
HashMap<String, String> tryMap;

并将属性加载到映射中,结果为：

 java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [java.util.HashMap]: no matching editors or conversion strategy found

有什么想法如何创建一个映射策略吗？

Answer 1

没有默认转换器。所以您必须编写自己的转换器并将其注册到ConversationService。

这里是一个基于注释的示例：

@Bean(name="conversionService") 
public static ConversionService getConversionService(){
    ConversionServiceFactoryBean conversionServiceFactoryBean = new ConversionServiceFactoryBean();
    Set<Converter<?,?>> converters = new HashSet<Converter<?,?>>();
    converters.add(new StringToHashMapConverter());
    conversionServiceFactoryBean.setConverters(converters);
    conversionServiceFactoryBean.afterPropertiesSet();
    return conversionServiceFactoryBean.getObject();
}

转换器：

import java.util.HashMap;

import org.springframework.core.convert.converter.Converter;

public class StringToHashMapConverter implements Converter<String,HashMap> {

    @Override
    public HashMap convert(String paramS) {
           //do the coversion
    }

}