如何在Groovy中高效简洁地发送GET请求至REST API并将响应数据存入变量

Here's the most concise and efficient way to hit your REST API, fetch the numeric list response, and store it as a Groovy list object—using only Groovy's built-in utilities (no external dependencies required):

import groovy.json.JsonSlurper

// Replace with your actual API endpoint
def apiEndpoint = "https://your-api-url.com/your-endpoint"

// Fetch response and parse directly into a list
def responseData = new JsonSlurper().parseText(new URL(apiEndpoint).text)

// Verify the result (optional)
println "Response type: ${responseData.getClass().simpleName}" // Outputs ArrayList
println "First value: ${responseData[0]}" // Outputs 200

Why this works: #

• new URL(apiEndpoint).text makes a GET request and returns the raw JSON response string in one line—Groovy handles the underlying HTTP connection boilerplate for you.
• JsonSlurper is Groovy's built-in JSON parser that automatically converts the JSON array into a native Groovy List<Integer>—exactly the object type you need.

Optional: Adding error handling #

If you want to handle cases like network timeouts, invalid endpoints, or malformed JSON, wrap the code in a try-catch block:

import groovy.json.JsonSlurper

def apiEndpoint = "https://your-api-url.com/your-endpoint"
def responseData = []

try {
    def jsonResponse = new URL(apiEndpoint).text
    responseData = new JsonSlurper().parseText(jsonResponse)
} catch (IOException e) {
    println "Failed to connect to API: ${e.message}"
} catch (Exception e) {
    println "Failed to parse response: ${e.message}"
}

// Use responseData safely
if (!responseData.isEmpty()) {
    println "Fetched ${responseData.size()} values"
}

Optional: Custom headers (e.g., authentication) #

If your API requires headers like an auth token, use URLConnection for more control:

import groovy.json.JsonSlurper

def apiEndpoint = "https://your-api-url.com/your-endpoint"
def connection = new URL(apiEndpoint).openConnection()
connection.setRequestProperty("Authorization", "Bearer your-token")
connection.setRequestProperty("Accept", "application/json")

def responseData = new JsonSlurper().parse(connection.getInputStream())

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