Spring任务调度<task:scheduled-tasks>【含cron参数详解】 （转载）

<beans xmlns="http://www.springframework.org/schema/beans"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xmlns:aop="http://www.springframework.org/schema/aop"  
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:task="http://www.springframework.org/schema/task"  
    xsi:schemaLocation="  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd  
        http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd"  
    default-lazy-init="true">  

<bean id="voiceFileClearJob" class="com.zjr.modules.boss.job.VoiceFileClearJob" />  
<bean id="versionListenJob" class="com.zjr.modules.boss.job.VersionListenJob" />  
<bean id="statJob" class="com.zjr.modules.opstat.job.StatJob" />  

<task:scheduled-tasks>  
    <task:scheduled ref="voiceFileClearJob" method="execute" initial-delay="5000" fixed-delay="3600000"/>  
    <task:scheduled ref="versionListenJob" method="execute" initial-delay="5000" fixed-delay="5000"/>  
    <task:scheduled ref="statJob" method="statLgj" cron="0 59 23 * * ?"/>  
    <task:scheduled ref="statJob" method="statBadNameAndQQ" cron="23 28 20 * * ?"/>  
</task:scheduled-tasks>  

package com.zjr.modules.boss.job;  
  
import ...  
  
public class VersionListenJob {  
  
    Logger logger = LoggerFactory.getLogger(VersionListenJob.class);  
  
    private static final String GMBOSS_DIR = "/data/jweb_static/jweb_wb_mgmt_beta/gmboss/";  
    private static final String GMBOSS_VERSION_TXT_FILE = "/data/jweb_static/jweb_wb_mgmt_beta/txt/version.txt";  
    private static final String DOWNLOAD_URL = "http://beta.wbmgmt.youzijie.com/gmboss/";  
  
    private Map<String, String> versionInfoMap = new HashMap<>();  
    private File dir = new File(GMBOSS_DIR);  
    private File versionTxt = new File(GMBOSS_VERSION_TXT_FILE);  
  
    public VersionListenJob() {  
        try {  
            init();  
        } catch (IOException e) {  
            logger.error("error occurs during VersionListenJob", e);  
        }  
    }  
  
    private void init() throws IOException {  
  
        if (!versionTxt.exists())  
            versionTxt.createNewFile();  
  
        for (String line : FileUtils.readLines(versionTxt)) {  
            String[] array = StringUtils.split(line, "|");  
            if (array.length == 5)  
                versionInfoMap.put(array[0], array[4]);  
        }  
    }  
  
    public void execute() throws IOException {  
  
        if (EnvironmentUtil.isLocal() || !dir.exists() || !dir.isDirectory()) {  
            return;  
        }  
  
        //是否有文件更新  
        Boolean needUpdate = false;  
        List<File> allFiles = getFiles(dir.getAbsolutePath());  
  
        for (File file : allFiles) {  
            String filePath = file.getPath();  
            long lastModifiedTime = file.lastModified();  
            if (!StringUtils.equals(lastModifiedTime + "", versionInfoMap.get(filePath))) {  
                needUpdate = true;  
                break;  
            }  
        }  
  
        if (needUpdate) {  
            List<String> list = new ArrayList<>();  
            for (File file : allFiles) {  
                list.add(file.getAbsolutePath().replace(GMBOSS_DIR,"/") + "|"  
                        + md5(file) + "|"  
                        + file.getPath().replace(GMBOSS_DIR,DOWNLOAD_URL) + "|"  
                        + file.length() + "|"  
                        + file.lastModified());  
            }  
            FileUtils.writeLines(versionTxt,"UTF-8", list, IOUtils.LINE_SEPARATOR_WINDOWS,false);  
            logger.info("VersionListenJob: Gmboss has been updated");  
        }  
    }  
  
    //递归获取目录下的所有文件列表  
    public List<File> getFiles(String filePath) throws IOException {  
  
        List<File> allFiles = new ArrayList<>();  
  
        File root = new File(filePath);  
        File files[] = root.listFiles();  
        if (files != null && files.length != 0) {  
            for (File file : files) {  
                if (file.isDirectory()) {  
                    allFiles.addAll(getFiles(file.getAbsolutePath()));  
                } else {  
                    allFiles.add(file);  
                }  
            }  
        }  
        return allFiles;  
    }  
  
    public String md5(File f) {  
        MessageDigest md = null;  
        try {  
            md = MessageDigest.getInstance("MD5");  
        } catch (NoSuchAlgorithmException ne) {  
            ne.printStackTrace();  
        }  
        if (md == null)  
            return null;  
        FileInputStream fis = null;  
        try {  
            fis = new FileInputStream(f);  
            byte[] buffer = new byte[8192];  
            int length;  
            while ((length = fis.read(buffer)) != -1) {  
                md.update(buffer, 0, length);  
            }  
            return new String(Hex.encodeHex(md.digest())).toUpperCase();  
        } catch (Exception e) {  
            logger.error("error occurs during md5 file", e);  
            return null;  
        } finally {  
            try {  
                if (fis != null)  
                    fis.close();  
            } catch (IOException e) {  
                logger.error("error occurs during md5 file", e);  
            }  
        }  
    }  
}