package xitongshezhi;
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import java.io.*;
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import java.text.SimpleDateFormat;
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import java.util.*;
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import java.util.concurrent.locks.ReentrantLock;
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public class Charulog {
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private static final String LOG_FILE = "log.properties";
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private static final int MAX_RECORDS = 500;
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private static final ReentrantLock lock = new ReentrantLock();
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private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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/**
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* 静态方法：记录操作日志
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* @param operation 操作内容
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*/
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public static void logOperation(String operation) {
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lock.lock();
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try {
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// 添加时间戳
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String timestamp = dateFormat.format(new Date());
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String logEntry = "[" + timestamp + "] " + operation;
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// 读取现有日志
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Properties logProps = readLogFile();
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// 添加新记录
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addNewLogEntry(logProps, logEntry);
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// 如果超过最大记录数，删除最早的记录
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if (logProps.size() > MAX_RECORDS) {
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removeOldestEntries(logProps);
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}
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// 写回文件
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writeLogFile(logProps);
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} catch (Exception e) {
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System.err.println("记录日志时发生错误: " + e.getMessage());
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} finally {
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lock.unlock();
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}
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}
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/**
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* 读取日志文件
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*/
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private static Properties readLogFile() {
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Properties props = new Properties();
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File file = new File(LOG_FILE);
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if (file.exists()) {
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try (FileInputStream fis = new FileInputStream(file)) {
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props.load(fis);
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} catch (IOException e) {
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System.err.println("读取日志文件失败: " + e.getMessage());
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}
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}
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return props;
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}
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/**
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* 添加新的日志条目
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*/
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private static void addNewLogEntry(Properties props, String logEntry) {
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// 使用时间戳作为key，确保唯一性
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String key = "log_" + System.currentTimeMillis() + "_" + UUID.randomUUID().toString().substring(0, 8);
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props.setProperty(key, logEntry);
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}
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/**
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* 移除最早的记录
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*/
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private static void removeOldestEntries(Properties props) {
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// 将属性转换为列表以便排序
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List<Map.Entry<Object, Object>> entries = new ArrayList<>(props.entrySet());
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// 按键排序（假设键包含时间信息）
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entries.sort((e1, e2) -> {
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String key1 = (String) e1.getKey();
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String key2 = (String) e2.getKey();
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return key1.compareTo(key2);
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});
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// 删除超出限制的最早记录
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while (entries.size() > MAX_RECORDS) {
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Map.Entry<Object, Object> oldest = entries.remove(0);
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props.remove(oldest.getKey());
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}
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}
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/**
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* 写入日志文件
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*/
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private static void writeLogFile(Properties props) {
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try (FileOutputStream fos = new FileOutputStream(LOG_FILE)) {
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// 添加文件头注释
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props.store(fos, "操作日志记录 - 最后更新: " + new Date());
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} catch (IOException e) {
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System.err.println("写入日志文件失败: " + e.getMessage());
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}
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}
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/**
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* 获取当前日志记录数量（用于测试）
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*/
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public static int getLogCount() {
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Properties props = readLogFile();
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return props.size();
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}
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/**
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* 清空日志文件（用于测试）
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*/
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public static void clearLogs() {
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lock.lock();
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try {
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Properties props = new Properties();
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writeLogFile(props);
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} finally {
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lock.unlock();
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}
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}
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/**
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* 读取并打印所有日志（用于测试）
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*/
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public static void printAllLogs() {
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Properties props = readLogFile();
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List<Map.Entry<Object, Object>> entries = new ArrayList<>(props.entrySet());
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// 按键排序
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entries.sort((e1, e2) -> {
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String key1 = (String) e1.getKey();
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String key2 = (String) e2.getKey();
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return key1.compareTo(key2);
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});
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System.out.println("=== 操作日志记录 (共 " + entries.size() + " 条) ===");
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for (Map.Entry<Object, Object> entry : entries) {
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System.out.println(entry.getValue());
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}
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System.out.println("=== 日志结束 ===");
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}
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}
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