使用Python Selenium点击Chrome下载按钮无法下载PDF压缩包的问题

以下是针对你遇到的下载未触发问题的具体解决步骤：

1. 修正元素定位逻辑 #

你当前点击的是按钮内部的<span>标签，这可能无法触发按钮的点击事件。直接定位到<button>标签本身：

button = driver.find_element(By.XPATH, '//*[@id="react-root"]/div/div/div/main/section[1]/div/div/div/form/button')

2. 完善Chrome下载偏好配置 #

添加更多针对下载安全限制、PDF插件的设置，避免拦截：

options.add_experimental_option('prefs',  {
    "download.default_directory": r"你的完整下载路径",
    "download.prompt_for_download": False,
    "download.directory_upgrade": True,
    "plugins.always_open_pdf_externally": True,
    "safebrowsing.enabled": False,
    "safebrowsing.disable_download_protection": True,
    "plugins.plugins_list": [{"enabled": False, "name": "Chrome PDF Viewer"}],
    "download.extensions_to_open": ""
})

注意：确保下载路径存在且有读写权限，Windows路径使用原始字符串（r"路径"）或双反斜杠。

3. 使用显式等待替代直接定位 #

避免因元素未加载完成导致点击失效，用WebDriverWait等待元素可点击：

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

# 最长等待10秒，直到按钮可点击
button = WebDriverWait(driver, 10).until(
    EC.element_to_be_clickable((By.XPATH, '//*[@id="react-root"]/div/div/div/main/section[1]/div/div/div/form/button'))
)
button.click()

4. 检查网站权限限制 #

ScienceDirect的部分内容需要登录订阅账号才能下载。先手动打开页面点击下载按钮，确认是否需要登录。如果需要，在Selenium代码中添加登录步骤（如填写账号密码）。

5. 替换固定sleep为下载完成等待 #

time.sleep(5)可能不足以等待下载完成，新增函数检查下载目录中的文件状态：

import os

def wait_for_download(download_dir, timeout=30):
    end_time = time.time() + timeout
    while time.time() < end_time:
        for filename in os.listdir(download_dir):
            # 排除Chrome临时下载文件（.crdownload后缀）
            if not filename.endswith('.crdownload'):
                return True
        time.sleep(1)
    return False

# 点击按钮后调用
wait_for_download(r"你的完整下载路径")

修改后的完整代码 #

from selenium import webdriver
import time
import os
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.common.by import By
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from webdriver_manager.chrome import ChromeDriverManager

# 配置下载目录
download_dir = r"C:\你的完整下载路径"
os.makedirs(download_dir, exist_ok=True)

options = Options()
options.add_experimental_option('prefs',  {
    "download.default_directory": download_dir,
    "download.prompt_for_download": False,
    "download.directory_upgrade": True,
    "plugins.always_open_pdf_externally": True,
    "safebrowsing.enabled": False,
    "safebrowsing.disable_download_protection": True,
    "plugins.plugins_list": [{"enabled": False, "name": "Chrome PDF Viewer"}],
    "download.extensions_to_open": ""
})

service = Service(ChromeDriverManager().install())
driver = webdriver.Chrome(service=service, options=options)

driver.get('https://www.sciencedirect.com/journal/international-journal-of-greenhouse-gas-control/vol/127/suppl/C')

# 如需登录，在此添加登录逻辑
# driver.find_element(By.ID, 'username').send_keys('你的账号')
# driver.find_element(By.ID, 'password').send_keys('你的密码')
# driver.find_element(By.ID, 'submit-btn').click()

# 等待按钮可点击并触发下载
button = WebDriverWait(driver, 10).until(
    EC.element_to_be_clickable((By.XPATH, '//*[@id="react-root"]/div/div/div/main/section[1]/div/div/div/form/button'))
)
button.click()

# 等待下载完成
def wait_for_download(download_dir, timeout=30):
    end_time = time.time() + timeout
    while time.time() < end_time:
        files = os.listdir(download_dir)
        if files:
            for f in files:
                if not f.endswith('.crdownload'):
                    print(f"下载完成：{f}")
                    return True
        time.sleep(1)
    print("下载超时")
    return False

wait_for_download(download_dir)

driver.quit()

内容的提问来源于stack exchange，提问作者user22139764