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Python 解析 JSON 日志:从一行数据到一份报告

  • 2026-08-19 01:51:06
Python 解析 JSON 日志:从一行数据到一份报告

Python 解析 JSON 日志:从一行数据到一份报告

写后端的人,天天跟日志打交道。现在大部分应用的日志都是 JSON 格式——每条日志是一个 JSON 对象,方便机器解析和分析。

Python 自带的 json 模块就是干这个的:把 JSON 字符串转成字典,或者把字典转成 JSON 字符串。用法就几个函数,但真正写脚本分析日志的时候,有些细节还是得注意。

核心就两个函数:loads 和 dumps

函数
干啥的
啥时候用
json.loads(s)
JSON 字符串 → Python 字典
读日志行的时候用
json.dumps(obj)
Python 字典 → JSON 字符串
写结果文件的时候用

JSON 字符串转字典:

import json

line = '{"url": "/api/user", "timeSpent": 45, "status": 200}'
data = json.loads(line)

print(data["url"])        # /api/user
print(data["timeSpent"])  # 45

字典转 JSON 字符串:

data = {"name""Bob""age"25"city""上海"}
json_str = json.dumps(data, ensure_ascii=False)
# {"name": "Bob", "age": 25, "city": "上海"}

ensure_ascii=False 这个参数经常被忽略——不加的话,中文会变成 \u4e0a\u6d77,虽然能解析,但人没法看。

日志分析实战:筛选慢请求

假设你有一份 API 日志 req_resp.log,每行是一个 JSON 对象:

{"url""/api/user""timeSpent"45"status"200"method""GET"}
{"url""/api/order""timeSpent"230"status"200"method""POST"}
{"url""/api/product""timeSpent"89"status"500"method""GET"}
{"url""/api/report""timeSpent"310"status"200"method""GET"}
{"url""/api/search""timeSpent"120"status"200"method""POST"}

需求很简单:找出耗时超过 150ms 的请求,打印出来。

完整实现

#!/usr/bin/env python3
import json

LOG_PATH = "req_resp.log"

with open(LOG_PATH, "r", encoding="utf-8"as f:
for line_num, line in enumerate(f, 1):
        line = line.strip()
ifnot line:
continue

try:
            data = json.loads(line)
except json.JSONDecodeError as e:
            print(f"第 {line_num} 行 JSON 解析失败: {e}")
continue

        time_spent = data.get("timeSpent"0)
if time_spent > 150:
            print(f"[慢请求] {data.get('method')}{data.get('url')} 耗时 {time_spent}ms")

运行结果

[慢请求] POST /api/order 耗时 230ms
[慢请求] GET /api/report 耗时 310ms

这个脚本虽然短,但包含了几个关键点:

  • 逐行读取:文件大也不怕,不会一次性加载到内存
  • 跳过空行:日志文件末尾经常有空行
  • **捕获 JSONDecodeError**:日志里可能有格式错误的一行,不能因为一条坏数据让整个脚本崩溃
  • **用 get() 而不是 []**:万一某条日志缺了某个字段,get() 返回默认值,[] 直接报 KeyError

把结果写到文件里

光打印不够,通常需要把筛选结果存下来,方便后续分析或者发给别人。

import json

LOG_PATH = "req_resp.log"
OUTPUT_PATH = "slow_requests.json"

slow_requests = []
error_count = 0

with open(LOG_PATH, "r", encoding="utf-8"as f:
for line_num, line in enumerate(f, 1):
        line = line.strip()
ifnot line:
continue

try:
            data = json.loads(line)
except json.JSONDecodeError:
            error_count += 1
continue

if data.get("timeSpent"0) > 150:
# 只保留需要的字段
            filtered = {
"url": data.get("url"),
"method": data.get("method"),
"timeSpent": data.get("timeSpent"),
"status": data.get("status")
            }
            slow_requests.append(filtered)

# 写入结果文件
with open(OUTPUT_PATH, "w", encoding="utf-8"as out_f:
    json.dump(slow_requests, out_f, ensure_ascii=False, indent=2)

print(f"慢请求数量: {len(slow_requests)}")
print(f"解析失败: {error_count} 行")
print(f"结果已保存到 {OUTPUT_PATH}")

indent=2 让输出的 JSON 有缩进,方便人看。如果文件很大,去掉 indent 能省空间。

处理嵌套 JSON

有些日志的字段是嵌套的,比如这样:

{
"request": {
"url""/api/user",
"method""GET",
"headers": {"User-Agent""Mozilla/5.0"}
    },
"response": {"status"200"timeSpent"45}
}

访问嵌套字段用连续的 [] 或者 get()

url = data["request"]["url"]
method = data["request"]["method"]
time_spent = data["response"]["timeSpent"]

如果某个中间字段可能不存在,用 get() 加上空字典兜底:

url = data.get("request", {}).get("url")

这种写法在数据格式不完全统一的时候很好用,一行代码就把嵌套访问和默认值都处理了。

几个经常遇到的问题

1. JSON 解析失败

json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes

最常见的几个原因:

  • 用了单引号而不是双引号(JSON 标准要求双引号)
  • 末尾多了逗号
  • 行里有非 JSON 的前缀,比如 [INFO] 2024-01-15 {"url": "/api"}

解决办法: 捕获异常,打印出问题行:

try:
    data = json.loads(line)
except json.JSONDecodeError:
    print(f"解析失败的行: {line[:100]}")
continue

如果日志行有固定前缀,用正则把 JSON 部分提取出来再解析。

2. 中文变成 Unicode

不加 ensure_ascii=False 的时候:

json.dumps({"name""张三"})   # '{"name": "\\u5f20\\u4e09"}'

加上:

json.dumps({"name""张三"}, ensure_ascii=False)   # '{"name": "张三"}'

3. 字段类型不一致

有的日志里 timeSpent 是数字,有的可能是字符串 "230"。解析的时候统一转换:

defsafe_get_int(data, key, default=0):
    value = data.get(key)
if value isNone:
return default
try:
return int(value)
except (ValueError, TypeError):
return default

time_spent = safe_get_int(data, "timeSpent"0)

文件读写:load 和 dump

如果整个文件就是一个 JSON 对象(不是每行一个),用 json.load() 和 json.dump()

# 读取
with open("config.json""r", encoding="utf-8"as f:
    config = json.load(f)

# 写入
with open("output.json""w", encoding="utf-8"as f:
    json.dump(config, f, ensure_ascii=False, indent=2)

但日志分析通常用逐行处理(每行一个 JSON),因为文件可能很大,一次性加载会撑爆内存。

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  1. CONNECT:[ UseTime:0.001109s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001617s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.022350s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007949s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001849s ]
  6. SELECT * FROM `set` [ RunTime:0.000635s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001887s ]
  8. SELECT * FROM `article` WHERE `id` = 510739 LIMIT 1 [ RunTime:0.063148s ]
  9. UPDATE `article` SET `lasttime` = 1787298742 WHERE `id` = 510739 [ RunTime:0.015015s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.020010s ]
  11. SELECT * FROM `article` WHERE `id` < 510739 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001575s ]
  12. SELECT * FROM `article` WHERE `id` > 510739 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008716s ]
  13. SELECT * FROM `article` WHERE `id` < 510739 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.051344s ]
  14. SELECT * FROM `article` WHERE `id` < 510739 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.136023s ]
  15. SELECT * FROM `article` WHERE `id` < 510739 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.035754s ]
0.604157s