如何在Groovy中正确解析JSON [英] How to properly parse JSON in Groovy

问题描述

我不确定如何使用Groovy正确解析嵌套的JSON.我包含了一个有效的Python脚本，因此您可以准确地看到我在Groovy中要做什么.

I am not sure how to properly parse through nested JSON using Groovy. I have included a working Python script so you can see exactly what I'm trying to do in Groovy.

我需要解析的JSON:

JSON I need to parse:

json_payload = {"number": 3585, "url": "https://jenkins.test.com/job/test/3585/",
                  "displayName": "test_3585", "timestamp": 1516992464686,
                  "actions": [{"causes": [{"userId": "test"}]}]}

我想做什么(Python):

What I want to do (Python):

class JenkinsParser:
    def __init__(self, json_data):

        self.display_name = json_data['displayName']
        self.url = json_data['url']
        self.start_time = json_data['timestamp']
        self.exec_url = json_data['url']
        self.exec_number = json_data['number']
        self.user = None
        actions = json_data['actions']
        for a in actions:
            if 'causes' in a:
                for cause in a['causes']:
                    if 'userId' in cause:
                        self.user = cause['userId']

        url_split = self.execution_url.split("/job/")
        self.jenkins_url = url_split[0]
        self.job_name = url_split[-1].split("/")[0]

注意:Groovy不一定需要是一个类，也不需要使用JSonSlurper

Note: The Groovy does not necessarily need to be a class, and doesn't need to use JSonSlurper

如果我使用JsonSlurper

If I use JsonSlurper

def slurper = new groovy.json.JsonSlurper()
def result = slurper.parseText(json_payload)

我可以像这样访问所有需要的值吗?

Can I access all the values I need like so?

result.displayName
result.url
result.timestamp
result.url
result.number
result.actions.causes.userId

我不确定如何获取用户ID.

I'm not sure how to grab userId..

推荐答案

是的，您可以访问如上所述的值.

Yes, you can access the values like you described.

如果您确定数据的结构完全一样，则可以像result​.actions.first().causes.first().userId​那样访问userId.如果您可能有动作或没有动作，或者可能有或没有原因，则可以执行result​.actions?.first()?.causes?.first()?.userId​之类的操作以使访问为null安全，或者可以使用split(*.)运算符访问userId(如果存在)可能是多种动作或原因.

You could access userId like result​.actions.first().causes.first().userId​ if you're sure your data is structured exactly like that. If you may or may not have actions, or may or may not have causes, you could do something like result​.actions?.first()?.causes?.first()?.userId​ to make your access null-safe, or you could use the spread (*.) operator to access userId if there may be multiple actions or causes.

根据您对返回null的内容的评论，此操作可以按预期进行:

Per your comment about something returning null, this works as expected:

def json_payload = """{"number": 3585, "url": "https://jenkins.test.com/job/test/3585/", "displayName": "test_3585", "timestamp": 1516992464686, "actions": [{"causes": [{"userId": "test"}]}]}"""
def slurper = new groovy.json.JsonSlurper()
def result = slurper.parseText(json_payload)
return result​.actions?.first()?.causes?.first()?.userId​

并返回测试".如果看不到类似结果，则可能是语法错误或实际数据中的键不同.

and returns "test". If you are not seeing similar results you may have a syntax error or different key in your actual data.

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