Spring Boot调用 Shell 脚本实现看门狗功能

#!/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

#!/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!"

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;
 }
}

@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，FileWriter 会先删除再新建
 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();

 // 设置权限，否则会报 Permission denied
 file.setReadable(true);
 file.setWritable(true);
 file.setExecutable(true);
 }
}

@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.");
 }
 }
}

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