前言

前面【Locust性能测试2-先登录场景案例】讲了登录的案例，这种是直接传账号和密码就能登录了，有些登录的网站会复杂一点，

需要先从页面上动态获取参数，作为登录接口的请求参数，如【学信网：https://account.chsi.com.cn/passport/login】的登录接口请求参数

请求参数

需要先发个get请求，从返回的html页面中解析出需要的数据

• lt ： LT-277623-5ldGTLqQhP4foKihHUlgfKPeGGyWVI


• execution： e1s1

备注：

lt 参数是每次打开浏览器，访问登录首页时服务端会返回一个新的数据

execution 参数是表示网站刷新次数，可以刷新下再登录，就变成 e2s1了






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locustfile3.py代码

前面用篇专门讲了requests实现接口的参数关联案例，这里直接转化成locust脚本就行了

# coding:utf-8
from locust import HttpLocust, TaskSet, task
from lxml import etree
class LoginDemo(TaskSet):
&＃39;&＃39;&＃39;用户行为描述&＃39;&＃39;&＃39;
def get_it_execution(self):
result = {}
h1 = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
}
self.client.headers.update(h1)
r = self.client.get("/passport/login", verify=False)
# 从返回html页面，解析出lt、execution
dom = etree.HTML(r.content.decode("utf-8"))
try:
result["lt"] = dom.xpath(&＃39;//input[@name="lt"]&＃39;)[0].get("value")
result["execution"] = dom.xpath(&＃39;//input[@name="execution"]&＃39;)[0].get("value")
print(result)
except:
print("lt、execution参数获取失败！")
return result
def login(self, user, psw):
result = self.get_it_execution()
loginurl = "/passport/login"
h2 = {
"Referer": loginurl,
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
"Origin": "https://account.chsi.com.cn",
"Content-Length": "119",
"Cache-Control": "max-age=0",
"Upgrade-Insecure-Requests": "1",
"Content-Type": "application/x-www-form-urlencoded"
}
body = {
"username": user,
"password": psw,
"rememberMe": "true",
"lt": result["lt"],
"execution": result["execution"],
"_eventId": "submit"
}
self.client.headers.update(h2)
print(self.client.headers)
r1 = self.client.post(loginurl, data=body, verify=False)
# print(r1.text)
@task(1)
def test_login(self):
# 测试数据
user = "13888888888"
psw = "111111"
self.login(user, psw)
class websitUser(HttpLocust):
task_set = LoginDemo
host = "https://account.chsi.com.cn"
min_wait = 3000 # 单位毫秒
max_wait = 6000 # 单位毫秒
if __name__ == "__main__":
import os
os.system("locust -f locustfile3.py")