shell脚本方式

一、判断进程是否挂掉

#!/bin/bash
#
# 判断进程是否挂掉
# 版权 2023 wsjuanve
ps -eaf | grep BCS.out | grep -v grep
if [ $? -ne 0 ]; then
  echo "没有运行"
else
  echo "正在运行"
fi

二、判断进程是否挂掉，挂掉重启

#!/bin/bash
#
# 判断进程是否挂掉，挂掉重启
# 版权 2023 wsjuanve
while true; do
  ps -eaf | grep BCS.out | grep -v grep
  if [ $? -ne 0 ]; then
    echo "没有运行"
    nohup /home/kali/www/config/shell/BCS.out >/dev/null 2>&1 &
  else
    echo "正在运行"
  fi
  sleep 20
done

java代码方式

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

class Test {

   // 判断进程是否挂掉，挂掉重启
   public static void main(String[] args) {
      if (!findProcess()) {
         start();
      }
   }
   
   
   public static boolean findProcess() {

      BufferedReader bufferedReader = null;
      try {
         String procname = "BCS.out";
         String[] cmd = new String[]{"bash", "-c", "ps -eaf | grep " + procname + " | grep -v grep"};
         ProcessBuilder pb = new ProcessBuilder(cmd);
         pb.redirectErrorStream(true);
         Process process = pb.start();
         bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
         String line = null;
         while ((line = bufferedReader.readLine()) != null) {
            if (line.contains("BCS")) {
               System.out.println(line);
               return true;
            }
         }

         int rc = process.waitFor();
            if (rc != 0) {
                throw new RuntimeException("Failed rc=" + rc + " cmd=" + Arrays.toString(cmd));
            }

      } catch (Exception e) {
         return false;
      }
      return true;
   }
    
    
   public static void start() {
      try {
         Runtime.getRuntime().exec("nohup /home/kali/www/config/shell/BCS.out >/dev/null 2>&1 &");
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }

}