如何使用groovy解析json
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how to parse json using groovy
提问by Nikhil Sharma
I want to parse JSON data which is coming in like:
我想解析传入的 JSON 数据，如下所示：
{
"212315952136472": {
"id": "212315952136472",
"name": "Ready",
"picture": "http://profile.ak.fbcdn.net/hprofile-ak-snc4/195762_212315952136472_4343686_s.jpg",
"link": "http://www.hityashit.com/movie/ready",
"likes": 5,
"category": "Movie",
"description": "Check out the reviews of Ready on http://www.hityashit.com/movie/ready"
}
}
The code I am using is:
我正在使用的代码是：
JSONElement userJson = JSON.parse(jsonResponse)
userJson.data.each {
Urls = it.link
}
But I am not able to get anything assigned to Urls. Any suggestions?
但是我无法将任何分配给Urls. 有什么建议？
回答by Dónal
Have you tried using JsonSlurper?
您是否尝试过使用JsonSlurper？
Example usage:
用法示例：
def slurper = new JsonSlurper()
def result = slurper.parseText('{"person":{"name":"Guillaume","age":33,"pets":["dog","cat"]}}')
assert result.person.name == "Guillaume"
assert result.person.age == 33
assert result.person.pets.size() == 2
assert result.person.pets[0] == "dog"
assert result.person.pets[1] == "cat"
回答by Burt Beckwith
That response is a Map, with a single element with key '212315952136472'. There's no 'data' key in the Map. If you want to loop through all entries, use something like this:
该响应是一个 Map，带有一个键为“212315952136472”的元素。地图中没有“数据”键。如果要遍历所有条目，请使用以下内容：
JSONObject userJson = JSON.parse(jsonResponse)
userJson.each { id, data -> println data.link }
If you know it's a single-element Map then you can directly access the link:
如果你知道它是一个单元素 Map 那么你可以直接访问link：
def data = userJson.values().iterator().next()
String link = data.link
And if you knew the id (e.g. if you used it to make the request) then you can access the value more concisely:
如果您知道 id（例如，如果您使用它来发出请求），那么您可以更简洁地访问该值：
String id = '212315952136472'
...
String link = userJson[id].link
回答by Andrii Abramov
You can map JSON to specific class in Groovy using asoperator:
您可以使用as运算符将 JSON 映射到 Groovy 中的特定类：
import groovy.json.JsonSlurper
String json = '''
{
"name": "John",
"age": 20
}
'''
def person = new JsonSlurper().parseText(json) as Person
with(person) {
assert name == 'John'
assert age == 20
}
