From ede4f6c21fea1dc83a079d5e55664495a7ee6544 Mon Sep 17 00:00:00 2001
From: fly6516 <fly6516@outlook.com>
Date: Mon, 14 Apr 2025 03:51:05 +0800
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- 新增2-6.py 文件，实现日志解析和统计功能
- 使用 Spark 集群处理大规模日志数据
- 提取每日404 错误次数并使用 Matplotlib 绘制折线图
- 通过正则表达式解析日志，过滤出404 状态码的日志
- 按日期统计404 错误次数，并排序
- 最后展示折线图，直观显示每日 404 错误的变化趋势
---
 2-6.py | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 2-6.py

diff --git a/2-6.py b/2-6.py
new file mode 100644
index 0000000..1862def
--- /dev/null
+++ b/2-6.py
@@ -0,0 +1,79 @@
+import re
+import matplotlib.pyplot as plt
+from pyspark import SparkContext
+
+# 初始化 SparkContext
+sc = SparkContext.getOrCreate()
+
+# 日志匹配的正则表达式
+LOG_PATTERN = re.compile(
+    r'^(\S+) (\S+) (\S+) \[([\w:/]+\s[+-]\d{4})\] "(\S+) (\S+)\s*(\S*)\s?" (\d{3}) (\S+)'
+)
+
+# 解析日志的函数
+def parse_log_line(line):
+    match = LOG_PATTERN.match(line)
+    if not match:
+        return None
+
+    content_size_str = match.group(9)
+    content_size = int(content_size_str) if content_size_str.isdigit() else 0
+
+    return {
+        'ip': match.group(1),
+        'user_identity': match.group(2),
+        'user_id': match.group(3),
+        'timestamp': match.group(4),
+        'method': match.group(5),
+        'endpoint': match.group(6),
+        'protocol': match.group(7),
+        'status_code': int(match.group(8)),
+        'content_size': content_size
+    }
+
+def extract_day(log):
+    # 时间格式为：10/Oct/2000:13:55:36 -0700
+    full_date = log['timestamp']
+    day = full_date.split('/')[0]  # 只提取日
+    return day
+
+if __name__ == "__main__":
+    # 加载日志文件
+    logFile = "hdfs://master:9000/user/root/apache.access.log.PROJECT"
+    raw_logs = sc.textFile(logFile)
+
+    # 解析并过滤有效日志
+    access_logs = raw_logs.map(parse_log_line).filter(lambda x: x is not None).cache()
+
+    # 过滤 404 状态码的日志
+    error_404_logs = access_logs.filter(lambda log: log['status_code'] == 404).cache()
+
+    # 每日 404 次数统计
+    errDateSorted = (
+        error_404_logs
+        .map(lambda log: (extract_day(log), 1))
+        .reduceByKey(lambda a, b: a + b)
+        .sortByKey(True)
+        .cache()
+    )
+
+    # 收集结果
+    daily_404_stats = errDateSorted.collect()
+
+    # 提取日期和404次数
+    days = [day for day, _ in daily_404_stats]
+    counts = [count for _, count in daily_404_stats]
+
+    # 使用 matplotlib 绘制折线图
+    plt.figure(figsize=(10, 6))
+    plt.plot(days, counts, marker='o', color='b', linestyle='-', linewidth=2, markersize=6)
+    plt.title("每日 404 响应代码记录")
+    plt.xlabel("日期")
+    plt.ylabel("404 错误次数")
+    plt.xticks(rotation=45)
+    plt.grid(True)
+    plt.tight_layout()
+    plt.show()
+
+    # 停止 Spark
+    sc.stop()