如何解析JSR223Sampler日志响应并提取access_token到变量

Hey there! Let's walk through how to grab that access_token from your logged API response and store it as a reusable variable in JMeter using Groovy in the JSR223 Sampler. Here's what you need to do:

Step 1: Pull the JSON from the Log Line #

Your log entry has extra prefixes (timestamp, log level, etc.), so first we'll use a regex to extract just the JSON part:

// Replace this with your actual log line, or fetch it dynamically if needed
def logLine = "2018-05-31 15:38:09,291 INFO o.a.j.p.j.s.JSR223Sampler: {\"access_token\":\"acdaraffafasvtokenhgsvjdk\",\"token_type\":\"sample\",\"expires_in\":80,\"scope\":\"map.c map.r\",\"ext_attr\":{\"enhancer\":\"aqa\",\"zdn\":\"map\"},\"jti\":\"jhfeayishdgvs77sdzxcfnkjdx\"}"

// Use regex to match the JSON block ({...})
def jsonMatch = logLine =~ /\{.*\}/
if (jsonMatch.find()) {
    def jsonString = jsonMatch.group(0)
    // We'll parse this JSON next
} else {
    log.error("Oops, couldn't find JSON content in the log line!")
}

Step 2: Parse JSON & Extract access_token #

Groovy has a built-in JsonSlurper that makes parsing JSON a breeze. We'll use it to pull out the access_token and save it to a JMeter variable:

import groovy.json.JsonSlurper

// Continuing from Step 1, inside the if block
def jsonSlurper = new JsonSlurper()
def responseData = jsonSlurper.parseText(jsonString)

// Grab the access_token value
def accessToken = responseData.access_token

// Save it as a JMeter variable (you can use ${access_token} in later samplers)
vars.put("access_token", accessToken)

// Optional: Log it to verify it worked
log.info("Successfully extracted access_token: ${accessToken}")

Full Working Code for JSR223 Sampler #

Putting it all together, here's the complete script you can drop into your JSR223 Sampler:

import groovy.json.JsonSlurper

// Replace with your actual log line OR use prev.getResponseDataAsString() if you're working directly with the sampler's response
def logLine = "2018-05-31 15:38:09,291 INFO o.a.j.p.j.s.JSR223Sampler: {\"access_token\":\"acdaraffafasvtokenhgsvjdk\",\"token_type\":\"sample\",\"expires_in\":80,\"scope\":\"map.c map.r\",\"ext_attr\":{\"enhancer\":\"aqa\",\"zdn\":\"map\"},\"jti\":\"jhfeayishdgvs77sdzxcfnkjdx\"}"

def jsonMatch = logLine =~ /\{.*\}/
if (jsonMatch.find()) {
    def jsonString = jsonMatch.group(0)
    def jsonSlurper = new JsonSlurper()
    def responseData = jsonSlurper.parseText(jsonString)
    
    if (responseData.access_token) {
        def accessToken = responseData.access_token
        vars.put("access_token", accessToken)
        log.info("Saved access_token to JMeter variable: ${accessToken}")
    } else {
        log.error("Uh-oh, no access_token found in the JSON response!")
    }
} else {
    log.error("Failed to extract JSON from the provided log line.")
}

Quick Tip #

If you're running the HTTP call directly in the same JSR223 Sampler, skip the log parsing entirely and use prev.getResponseDataAsString() to get the raw JSON response directly:

def jsonString = prev.getResponseDataAsString()

This is more efficient and avoids any regex-related issues.

内容的提问来源于stack exchange，提问作者Hari