应用流量监控及预警功能，使用psutil获取应用进程流量信息，然后呢

获取应用进程流量信息后，可以使用Python中的各种库来实现应用流量监控及预警功能。以下是一个简单的示例程序，可以监控指定进程的网络流量，并在流量超过预设阈值时发送邮件进行预警。

import psutil
import smtplib
from email.mime.text import MIMEText
from datetime import datetime
import time

# 监控的进程名和阈值（单位：MB）
PROCESS_NAME = "chrome"
THRESHOLD = 50

# 发件人和收件人信息
SENDER_EMAIL = "sender@example.com"
SENDER_PASSWORD = "password"
RECEIVER_EMAIL = "receiver@example.com"

# 邮件内容模板
MAIL_TEMPLATE = """\
Subject: 应用流量预警

时间：{time}
进程名：{name}
上传流量：{upload:.2f} MB
下载流量：{download:.2f} MB
"""

# 计算流量
def get_network_usage(pid):
    net_io_counters = psutil.net_io_counters(pernic=True)
    if psutil.pid_exists(pid):
        proc = psutil.Process(pid)
        proc_name = proc.name()
        if proc_name != PROCESS_NAME:
            return None
        net_io = net_io_counters.get(proc_name)
        if net_io is None:
            return None
        upload = net_io.bytes_sent / 1024 / 1024
        download = net_io.bytes_recv / 1024 / 1024
        return {"name": proc_name, "upload": upload, "download": download}
    else:
        return None

# 发送邮件
def send_mail(content):
    msg = MIMEText(content)
    msg["Subject"] = "应用流量预警"
    msg["From"] = SENDER_EMAIL
    msg["To"] = RECEIVER_EMAIL
    try:
        server = smtplib.SMTP_SSL("smtp.example.com", 465)
        server.login(SENDER_EMAIL, SENDER_PASSWORD)
        server.sendmail(SENDER_EMAIL, RECEIVER_EMAIL, msg.as_string())
        server.quit()
        print("邮件发送成功")
    except Exception as e:
        print("邮件发送失败：", e)

# 监控流量
while True:
    network_usage = get_network_usage(psutil.pids()[0])
    if network_usage:
        if network_usage["upload"] > THRESHOLD or network_usage["download"] > THRESHOLD:
            mail_content = MAIL_TEMPLATE.format(
                time=datetime.now(),
                name=network_usage["name"],
                upload=network_usage["upload"],
                download=network_usage["download"]
            )
            send_mail(mail_content)
    time.sleep(60)

这段代码会每隔60秒监控一次指定进程的网络流量，如果上传流量或下载流量超过预设阈值，就会发送预警邮件。需要根据实际情况修改各个参数。