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Spring Boot調(diào)用 Shell 腳本實(shí)現(xiàn)看門(mén)狗功能

更新時(shí)間：2020年06月12日 17:27:10 作者：VictorBu

這篇文章主要介紹了Spring Boot調(diào)用 Shell 腳本實(shí)現(xiàn)看門(mén)狗功能,本文通過(guò)實(shí)例代碼給大家介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或工作具有一定的參考借鑒價(jià)值，需要的朋友可以參考下

需要實(shí)現(xiàn)看門(mén)狗功能，定時(shí)檢測(cè)另外一個(gè)程序是否在運(yùn)行，使用 crontab 僅可以實(shí)現(xiàn)檢測(cè)程序是否正在運(yùn)行，無(wú)法做到擴(kuò)展，如：手動(dòng)重啟、程序升級(jí)(如果只需要實(shí)現(xiàn)自動(dòng)升級(jí)功能可以使用 inotify)等功能；最后決定使用 Spring Boot 調(diào)用 Shell 腳本來(lái)實(shí)現(xiàn)

一、腳本

1.1 啟動(dòng)腳本

#!/bin/bash

ps -ef | grep "demo-app-0.0.1-SNAPSHOT.jar" | grep -v "grep"

if [ "$?" -eq 0 ]
then

# sleep
echo $(date "+%Y-%m-%d %H:%M:%S") "process already started!"

else

nohup java -jar -server /project/watchdog/demo-app-0.0.1-SNAPSHOT.jar &
echo $(date "+%Y-%m-%d %H:%M:%S") "process has been started!"

fi

1.2 重啟腳本

#!/bin/bash

pid=`ps -ef | grep "demo-app-0.0.1-SNAPSHOT.jar" | grep -v "grep" | awk '{print $2}'`

for id in $pid
do
 kill -9 $id
 echo "killed $id"
done

nohup java -jar -server /project/watchdog/demo-app-0.0.1-SNAPSHOT.jar &
echo $(date "+%Y-%m-%d %H:%M:%S") "process has been restarted!"

二、功能實(shí)現(xiàn)

將腳本放置在程序的資源目錄下，每次程序啟動(dòng)時(shí)將腳本讀取到指定位置，然后再通過(guò)定時(shí)任務(wù)執(zhí)行腳本

配置內(nèi)容：

shell:
 directory: /project/watchdog
 startupFileName: startup.sh
 restartFileName: restart.sh
@Configuration
@ConfigurationProperties(prefix = "shell")
public class ShellProperties {

 private String directory;
 private String startupFileName;
 private String restartFileName;

 /* getter & setter */

 public String getFullName(String fileName) {
 return directory + File.separator + fileName;
 }
}

2.1 啟動(dòng)時(shí)將腳本讀取到指定位置

@Component
public class InitRunner implements CommandLineRunner {

 @Autowired
 private ShellProperties shellProperties;

 @Autowired
 ResourceLoader resourceLoader;

 @Override
 public void run(String... args) throws Exception {
 generateFile(shellProperties.getStartupFileName());
 generateFile(shellProperties.getRestartFileName());
 }

 private void generateFile(String fileName) throws IOException {

 String fileFullName = shellProperties.getFullName(fileName);
 File file = new File(fileFullName);
 if(file.exists()) {
 return;
 }

 // 如果文件已存在，F(xiàn)ileWriter 會(huì)先刪除再新建
 FileWriter fileWriter = new FileWriter(fileFullName);

 Resource resource = resourceLoader.getResource("classpath:" + fileName);
 InputStream inputStream = resource.getInputStream();
 InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
 BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

 String data;
 while ((data = bufferedReader.readLine()) != null) {
 fileWriter.write(data + "\n");
 }

 bufferedReader.close();
 inputStreamReader.close();
 inputStream.close();

 fileWriter.close();

 // 設(shè)置權(quán)限，否則會(huì)報(bào) Permission denied
 file.setReadable(true);
 file.setWritable(true);
 file.setExecutable(true);
 }
}

2.2 定時(shí)任務(wù)定時(shí)任務(wù)執(zhí)行腳本

@Component
public class ShellTask {

 private static final Logger logger = LoggerFactory.getLogger(ShellTask.class);

 @Autowired
 private ShellProperties shellProperties;

 @Scheduled(cron = "0/10 * * * * ? ")
 public void start() throws IOException {
 executeShell(shellProperties.getStartupFileName());
 }

 private void executeShell(String fileName) throws IOException {

 String fileFullName = shellProperties.getFullName(fileName);
 File file = new File(fileFullName);
 if(!file.exists()) {
 logger.error("file {} not existed!", fileFullName);
 return;
 }

 ProcessBuilder processBuilder = new ProcessBuilder(fileFullName);
 processBuilder.directory(new File(shellProperties.getDirectory()));

 Process process = processBuilder.start();

// String input;
// BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
// BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));
// while ((input = stdInput.readLine()) != null) {
// logger.info(input);
// }
// while ((input = stdError.readLine()) != null) {
// logger.error(input);
// }

 int runningStatus = 0;
 try {
 runningStatus = process.waitFor();
 } catch (InterruptedException e) {
 logger.error("shell", e);
 }

 if(runningStatus != 0) {
 logger.error("failed.");
 }else {
 logger.info("success.");
 }
 }
}

2.3 擴(kuò)展

本例只實(shí)現(xiàn)了定時(shí)檢測(cè)程序是否運(yùn)行，如果沒(méi)有運(yùn)行則啟動(dòng)程序；如有需要可以添加接口，調(diào)用接口重啟程序；或者添加定時(shí)任務(wù)定時(shí)檢測(cè)程序是否有更新，如果有更新則下載新的 jar 包然后重啟程序

看門(mén)狗程序自己可以使用 crontab 定時(shí)檢測(cè)是否正在運(yùn)行，模仿上面的啟動(dòng)腳本編寫(xiě)看門(mén)狗的啟動(dòng)腳本，然后添加定時(shí)任務(wù)：

crontab -e
*/10 * * * * /project/watchdog/watchdog.sh
sudo systemctl reload crond.service

完整代碼：GitHub

參考：java去調(diào)用并執(zhí)行shell腳本以及問(wèn)題總結(jié)

總結(jié)

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