Tomcat temp 目录清理策略：运行时安全删除旧临时文件的考量与实践

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.AgeFileFilter;
import org.apache.commons.io.filefilter.AndFileFilter;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.commons.io.filefilter.WildcardFileFilter;

import java.io.File;
import java.util.Collection;
import java.util.Date;
import java.util.concurrent.TimeUnit;

public class TempFileCleaner {

    private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(TempFileCleaner.class);

    /**
     * Helper method to add/subtract days from a Date.
     * In a real application, you might use a more robust date utility.
     */
    private static Date addToDate(Date date, int amount, TimeUnit unit) {
        long millis = date.getTime();
        switch (unit) {
            case DAYS:
                millis += (long) amount * 24 * 60 * 60 * 1000;
                break;
            case HOURS:
                millis += (long) amount * 60 * 60 * 1000;
                break;
            // Add other units as needed
        }
        return new Date(millis);
    }

    public static void removeOldTemporaryFiles(String tomcatTempPath, int daysOld) {
        // 计算文件年龄限制：当前日期减去指定天数
        Date ageLimit = addToDate(new Date(), -daysOld, TimeUnit.DAYS);

        // 创建文件过滤器：筛选出比ageLimit更旧的且以.tmp结尾的文件
        IOFileFilter ageFilter = new AgeFileFilter(ageLimit, true); // true means include files older than ageLimit
        IOFileFilter tmpFileFilter = new WildcardFileFilter("*.tmp");
        IOFileFilter combinedFilter = new AndFileFilter(ageFilter, tmpFileFilter);

        File tempDirectory = new File(tomcatTempPath);

        if (tempDirectory.exists() && tempDirectory.isDirectory()) {
            Collection<File> filesToDelete = FileUtils.listFiles(tempDirectory, combinedFilter, TrueFileFilter.INSTANCE);
            int numberOfFilesToBeDeleted = filesToDelete.size();
            int filesDeletedCounter = 0;

            log.info("开始清理Tomcat临时目录：{}", tomcatTempPath);
            for (File fileObject : filesToDelete) {
                try {
                    if (fileObject.delete()) {
                        filesDeletedCounter++;
                        log.debug("已删除临时文件：{}", fileObject.getAbsolutePath());
                    } else {
                        log.warn("未能删除临时文件：{}", fileObject.getAbsolutePath());
                    }
                } catch (Exception e) {
                    log.error("删除临时文件时发生错误：{} - {}", fileObject.getAbsolutePath(), e.getMessage(), e);
                }
            }
            log.info("Tomcat临时文件清理完成 @ {}: 已删除 {} / 共 {} 个文件。",
                     tomcatTempPath, filesDeletedCounter, numberOfFilesToBeDeleted);
        } else {
            log.warn("Tomcat临时目录不存在或不是一个目录：{}", tomcatTempPath);
        }
    }

    public static void main(String[] args) {
        // 示例用法：假设Tomcat临时目录路径
        String tomcatTempDir = System.getProperty("java.io.tmpdir"); // 这是一个常见的临时目录路径
        // 在实际Tomcat环境中，您可能需要获取Tomcat的CATALINA_BASE/temp路径
        // 例如：String tomcatTempDir = "/path/to/tomcat/temp";

        // 删除两天前创建的.tmp文件
        removeOldTemporaryFiles(tomcatTempDir, 2);
    }
}