Java 从属性文件中读取 Map 并使用 spring 注释 @Value 加载
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Reading a Map from properties file and load with spring annotation @Value
提问by Abdullah
I have a list of (key/value) need to be populated to a map on a spring bean:
我有一个（键/值）列表需要填充到 spring bean 上的映射：
dmin.details.fieldsMap=name,Abdullah,\ street,Zayed,\ phone,+201020102010
dmin.details.fieldsMap=name,Abdullah,\ street,Zayed,\ phone,+201020102010
It's working fine with me using a list as below:
使用以下列表对我来说效果很好：
property:
财产：
dmin.details.fields=Abdullah,Zayed,+201020102010
dmin.details.fields=阿卜杜拉，扎耶德，+201020102010
Calling:
调用：
@Value("#{'${dmin.details.fields}'.split(',')}")
private List<String> fields;
Could anyone advise if this is doable in Spring?
谁能建议这在Spring中是否可行？
采纳答案by Vladimir Prudnikov
application.properties:
应用程序属性：
property.map={first:value, second:value}
then in Java code you can:
然后在 Java 代码中，您可以：
@Value("#{${property.map}}")
Map<String, String> map;
回答by Abdullah
As I didn't find any way in spring to read the property as a Map, I had to fill the map myself using the list filled by spring as below :
由于我在 spring 中没有找到任何方法将属性作为地图读取，因此我必须使用 spring 填充的列表自己填充地图，如下所示：
@Value("#{'${dmin.details.fields}'.split(',')}")
private List<String> fields;
private Map<String, String> fieldsMap;
@PostConstruct
public void init() {
fieldsMap = new HashMap<String, String>();
if (fields != null && fields.size() != 0) {
for (String field : fields) {
String[] splittedField = field.split(",");
fieldsMap.put(splittedField[0], splittedField[1]);
}
}
}
回答by Hari Rao
I found a slightly different case and explaining that below, in case if somebody is looking for it.
我发现了一个稍微不同的案例并在下面解释，以防万一有人在寻找它。
- I had trade_id_date={'123WC':'20100125', '234W':'20100125', 1689332:'20100125'} in properties file
Below in a java class
@Value("#{${trade_id_date}}") private Map tradeIdDateMap;
- 我在属性文件中有 trade_id_date={'123WC':'20100125', '234W':'20100125', 1689332:'20100125'}
下面是一个java类
@Value("#{${trade_id_date}}") 私有映射 tradeIdDateMap;
If you do not enclose the left hand side in single quotes if it is alphanumeric then you will get
如果您不将左侧用单引号括起来，如果它是字母数字，那么您将得到
Expression parsing failed; nested exception is org.springframework.expression.spel.SpelParseException
@0: EL1044E: Unexpectedly ran out of input
- So make sure you enclose that in single quotes
- 因此，请确保将其括在单引号中
