无法从 groovy 中的 yml 文件中获取值

Question

I have stored an entire yaml file into a Map yamlConfig which i am able to print and check.

The Output when I run the code: yamlConfig.each{ k, v -> println "${k}:${v}" } is:

Host:localhost
Port:10000
application:[name:ABC, preferences:[UUID:d3f3278e, server:localhost:2222]]
services:[[name:XYZ, instances:1, start:true]]
dataSets:[[name:ABC], [name:XYZ]]

Now, I am trying to fetch a value from Map using following code:

println yamlConfig.get("services").getAt("name")

However, I am getting the value: [XYZ] . Instead I need the result as XYZ , without square brackets.

Yml file I am using:

Host: localhost
Port: 10000
application:
  name: ABC
  preferences:
    UUID: d3f3278e
    server: localhost:2222
services:
  - name: XYZ
    instances: 1
    start: true
data:
  - name: ABC
  - name: XYZ

Answer 1

This is because of the - character placed before your name property. It makes the yaml parser treat what's inside the services section as an array.

When you ask for the name property doing yamlConfig['services']['name'] groovy gives you all the macthing properties of array items in the services array, and it can only return them in another array.

So either remove the - or use yamlConfig['services'][0]['name'] .

Answer 2

yamlConfig.get("services")

return a list but not a service, therefore when you apply getAt to the returned list of services it returns a list of names.

yamlConfig.get("services").getAt('name')

actually does

yaml['services'].collect { it['name'] }

so in order to get a name of a certain service you need to do something like this:

println yaml['services'][0]['name']