英文:
Stores array in YAML
问题
如何在 YAML 中存储数组，并在代码中从该数组中提取值？我尝试了以下方法：
report:
interval: 3
to:
- somemail@gmail.com
- somemail@somecompany.com
- io.lab@hh.com
- ...
稍后在代码中（Spring Boot 中），我试图将值提取到我的数组中：
@Value("${report.to}")
private String[] recipients;
因此，我期望获得这个数组：
String[] recipients = new String[]{"somemail@gmail.com", ...};
但是我得到了异常：Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'report.to' in value "${report.to}"。
我做错了什么？
英文:
How to store array in yaml and extract values from this array in the code? I tried like this:
report:
interval: 3
to:
- somemail@gmail.com
- somemail@somecompany.com
- io.lab@hh.com
- ...
Later in the code (Spring Boot) I'm trying to extract values into my array:
@Value("${report.to}")
private String [] recipients;
So, i'm expecting to get this array:
String [] recipients = new String[]{"somemail@gmail.com", ...}
But I get exception: Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'report.to' in value "${report.to}"
What did i do wrong?
答案1
得分: 1
只是建议一下，如果不是你想要的，请随意忽略，不用担心。
但或许你可以使用类似这样的方式：
@Value("#{ '${report.to}'.split(',') }")
private List<String> recipients;
并在属性文件中：
report:
interval: 3
to: somemail@gmail.com,somemail@somecompany.com,io.lab@hh.com
如果你在应用程序中获取了列表，转换成数组应该很简单。就像这样：
public String[] getRecipients() {
return recipients.toArray(new String[0]);
}
祝你有个好的一天。
英文:
Just suggesting, if it is not what you want, please feel free to ignore, no worries.
But maybe you can use something like
@Value("#{'${report.to}'.split(',')}")
private List<String> recipients;
and in the property file:
report:
interval: 3
to: somemail@gmail.com,somemail@somecompany.com,io.lab@hh.com
If you get the list in your app, the conversion to array should be straightforward. Like:
public String[] getRecipients() {
return recipients.toArray(new String[0]);
}
Good day
答案2
得分: 1
-
一种方法是将元素作为分隔列表传递。通常我们使用逗号，对于字符串数组，它可以直接使用。
-
第二种方法是使用List，然后您需要使用Spring SPEL格式设置分隔符... 请参见下面的示例。
YML
report:
interval: 3
to: somemail@gmail.com,somemail@somecompany.com,io.lab@hh.com
Class
@Value("${report.to:}")
private String[] array;
@Value("#{'${report.to}'.split(',')}")
private List<String> recipients;
@PostConstruct
void testList(){
recipients.stream().forEach(System.out::println);
for (String a : array) {
System.out.println(a);
}
}
英文:
-
One way is to pass the elements as delimited list. Typically we have used comma and it works out of the box for String arrays.
-
Second way to use a List, then you will need to set the delimiter using Spring SPEL format... see example below.
YML
report:
interval: 3
to: somemail@gmail.com,somemail@somecompany.com,io.lab@hh.com
Class
Value("${report.to:}")
private String[] array;
@Value("#{'${{report.to}'.split(',')}")
private List<String> recipients;
@PostConstruct
void testList(){
list.stream().forEach(System.out::println);
for (String a : array) {
System.out.println(a);
}
}
答案3
得分: 1
将您的YAML字段用逗号分隔以将其解析为数组：
report:
interval: 3
to: somemail@gmail.com, somemail@somecompany.com, io.lab@hh.com
您的Java代码可以是：
@Value("${report.to}")
private String[] recipients;
或者
@Value("${report.to}")
private List<String> recipients;
查看此链接以获取更多提示和技巧：
https://youtu.be/NFQDqEhx2e0
英文:
Make your yaml fields comma-separated to parse it as array
report:
interval: 3
to: somemail@gmail.com,somemail@somecompany.com,io.lab@hh.com
Your Java code can be
@Value("${report.to}")
private String [] recipients;
OR
@Value("${report.to}")
private List<String> recipients;
Follow this link for more tips and tricks
https://youtu.be/NFQDqEhx2e0
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