【系统监控程序】

用python编写一个系统监控程序，需要每隔一秒钟记录系统每个进程的资源占用和整体的资源占用情况，并输出成json，保存到文本文件。

import psutil
import json
import time

def get_process_usage():
    process_list = []
    for proc in psutil.process_iter(['pid', 'name', 'username', 'cpu_percent', 'memory_percent']):
        process_info = proc.info
        process_list.append({
            'pid': process_info['pid'],
            'name': process_info['name'],
            'username': process_info['username'],
            'cpu_percent': process_info['cpu_percent'],
            'memory_percent': process_info['memory_percent']
        })
    return process_list

def get_system_usage():
    cpu_percent = psutil.cpu_percent()
    memory_percent = psutil.virtual_memory().percent
    return {
        'cpu_percent': cpu_percent,
        'memory_percent': memory_percent
    }

def main():
    while True:
        system_usage = get_system_usage()
        process_usage = get_process_usage()
        data = {
            'system': system_usage,
            'processes': process_usage
        }
        json_data = json.dumps(data, indent=4)

        # 输出JSON数据
        print(json_data)

        # 保存JSON数据到文件
        with open('system_monitor.json', 'w') as file:
            file.write(json_data)

        time.sleep(1)

if __name__ == "__main__":
    main()