Linux环境下Java对进程的操作

来源：互联网发布：如何申请淘宝编辑：程序博客网时间：2024/06/11 20:01

Linux环境下Java对进程的操作

本次主要讨论linux底下java对进程是否存在进行判断，以及java如何执行Linux脚本和命令

java执行Linux脚本和命令

java要执行Linux脚本首先得获取java的运行环境runtime

/**  * 执行linux命令  * @auther liduote  * 2017-2-21 下午04:41:28  * @param runtime  * @throws IOException  */  public static void execCMD(Runtime runtime)                                  throws IOException {      runtime.exec("ls -al");  }

java判断某进程是否存在

tips:ps 命令使用方法
ps [-aAcdefHjlmNVwy][acefghLnrsSTuvxX][-C <指令名称>][-g <群组名称>]
[-G <群组识别码>][-p <进程识别码>][p <进程识别码>][-s <阶段作业>]
[-t <终端机编号>][t <终端机编号>][-u <用户识别码>][-U <用户识别码>]
[U <用户名称>][-<进程识别码>][–cols <每列字符数>]
[–columns <每列字符数>][–cumulative][–deselect][–forest]
[–headers][–help][– info][–lines <显示列数>][–no-headers]
[–group <群组名称>][-Group <群组识别码>][–pid <进程识别码>]
[–rows <显示列数>][–sid <阶段作业>][–tty <终端机编号>]
[–user <用户名称>][–User <用户识别码>][–version]
[–width <每列字符数>]

#假如查询mysql$ ps -C mysqld -f --columns=200-------------------------------UID        PID  PPID  C STIME TTY          TIME CMDpolkitd  24995 11152  0 Jan12 ?        00:21:22 mysqld --init-file=/tmp/mysql-first-time.sql

所以我们通过java代码的写法是

public boolean isExistProcess() throws IOException {      String command = "ps -C mysqld -f --cols=200";    String program = "mysqld --init-file=/tmp/mysql-first-time.sql";    boolean isExistProcess = false;    Process process = Runtime.getRuntime().exec(command);      InputStream in = process.getInputStream();      InputStreamReader is = new InputStreamReader(in);      BufferedReader read = new BufferedReader(is);        String line = "";        while((line = read.readLine()) != null) {          if(line.indexOf(program) >= 0) {              isExistProcess = true;              break;          }      }      //关闭流      in.close();      is.close();      read.close();      process.destroy();      return isExistProcess;  }

综合起来使用可以对apache（tomcat）进行重启

//软件安装目录  public static final String CATALINA_HOME = "/data/app/tomcat";    //重试次数  public static final int RETRY_TIME = 10;  /**  * 重启Tomcat  * @auther liduote  * 2017-2-21 下午05:27:24  * @param runtime  * @return  * @throws IOException  */  public static boolean restartTomcat(Runtime runtime) throws IOException{      //结束tomcat进程      for (int i = 0; i < RETRY_TIME; i++) {          if(isExistTomcatProcess(runtime)) {              //调用tomcat自身脚本结束进程              shutdownTomcat(runtime);              try {                  Thread.currentThread().sleep(5000);              } catch (InterruptedException e) {                  e.printStackTrace();              }              if(isExistTomcatProcess(runtime)) {                   //强制结束进程                  killTomcatBySoft(runtime);                  try {                      Thread.currentThread().sleep(5000);                  } catch (InterruptedException e) {                      e.printStackTrace();                  }              }          }else {              break;          }      }             //启动tomcat      for (int i = 0; i < RETRY_TIME; i++) {          if(!isExistTomcatProcess(runtime)) {              //调用tomcat自身脚本重启程序              startupTomcat(runtime);              try {                  Thread.currentThread().sleep(5000);              } catch (InterruptedException e) {                  e.printStackTrace();              }          }else {              break;          }      }      if(isExistTomcatProcess(runtime)) {          return true;      }else {          return false;      }  }  /**  * 判断是否含有tomcat进程  * @auther liduote  * 2017-2-21 下午04:41:04  * @param runtime  * @return  * @throws IOException  */  public static boolean isExistTomcatProcess(Runtime runtime) throws IOException {      String program = "org.apache.catalina.startup.Bootstrap start";      String command = "ps -C java -f --cols=1000";      return isExistProcess(runtime, command, program);  }  /**  * 判断是否含有apache进程  * @auther liduote  * 2017-2-21 下午04:41:04  * @param runtime  * @return  * @throws IOException  */  public static boolean isExistApacheProcess(Runtime runtime) throws IOException {      String program = "/usr/sbin/httpd";      String command = "ps -C httpd -f --cols=1000";      return isExistProcess(runtime, command, program);  }  /**  * 判断当前进程中是否含有program  * @auther liduote  * 2017-2-21 下午05:41:04  * @param runtime  * @param command  * @param program  * @return  * @throws IOException  */  public static boolean isExistProcess(Runtime runtime, String command, String program) throws IOException {      boolean isExistTomcatProcess = false;      Process process = runtime.exec(command);      InputStream in = process.getInputStream();      InputStreamReader is = new InputStreamReader(in);      BufferedReader read = new BufferedReader(is);        String line = "";        while((line = read.readLine()) != null) {          if(line.indexOf(program) >= 0) {              isExistTomcatProcess = true;              break;          }      }      //---------------------      in.close();      is.close();      read.close();      process.destroy();      //---------------------      return isExistTomcatProcess;  }  /**  * 关闭Tomcat  * @auther liduote  * 2017-2-21 下午04:41:04  * @param runtime  * @throws IOException  */  public static void shutdownTomcat(Runtime runtime) throws IOException {      runtime.exec(CATALINA_HOME + "bin/shutdown.sh");  }  /**  * 启动Tomcat  * @auther liduote  * 2017-2-21 下午04:41:04  * @param runtime  * @throws IOException  */  public static void startupTomcat(Runtime runtime) throws IOException {      runtime.exec(CATALINA_HOME + "bin/startup.sh");  }  /**  * 重启Apache  * @auther liduote  * 2017-2-21 下午04:41:04  * @param runtime  * @return  * @throws IOException  */  public static boolean restartApache(Runtime runtime) throws IOException {      if(isExistApacheProcess(runtime)) {          runtime.exec("/usr/sbin/httpd -k restart");      }else {          runtime.exec("/usr/sbin/httpd start");      }      if (isExistApacheProcess(runtime)){          return true;      }else{          return false;                 }  }  /**  * 强制结束Tomcat进程  * @auther liduote  * 2017-2-21 下午04:41:04   * @param runtime  * @throws IOException  */  public static void killTomcatBySoft(Runtime runtime) throws IOException {      String[] cmd = {"sh", "-c", "ps aux | grep tomcat"};      Process process = runtime.exec(cmd);      InputStream in = process.getInputStream();      InputStreamReader is = new InputStreamReader(in);      BufferedReader read = new BufferedReader(is);      String line = null;        while((line = read.readLine()) != null) {          if(line.indexOf("org.apache.catalina.startup.Bootstrap start") >= 0) {              String tomcatPid = line.split("\\s+")[1];              runtime.exec("kill -9 "+tomcatPid);          }      }      in.close();      is.close();      read.close();      process.destroy();  }

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