Java操作另一个Java程序使其重启的简单实现

package com.app;

import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;

import databasetool.DBtool;

public class ReStart implements Runnable {
  int status = 0;

  public void run() {
    DBtool con = new DBtool();
    ResultSet rs = null;
    String select = "select * from restart";
    String restar = "update restart set status = '0'";// 准备启动程序，设置Status为0，表示已启动
    try {
      int result = con.executeUpdate(restar);
      System.out.println("初始化，并将status状态设置为0，表示程序正常被启动了！");
    } catch (SQLException e) {
      e.printStackTrace();
    }
    while (true) {
      while (true) {
        if (status == 2) {// 2：表示关闭的程序等待重启
          System.out.println("status状态为2，表示需要重新启动数采程序！");
          try {
            int result = con.executeUpdate(restar);
            System.out.println("程序马上就被启动，并将status状态设置为0，表示程序正常运行！");
          } catch (SQLException e) {
            e.printStackTrace();
          }
          String cmd = "cmd /c start E:\\Bats\\MainThread.bat";// pass
          try {
            Process ps = Runtime.getRuntime().exec(cmd);
            ps.waitFor();
          } catch (IOException ioe) {
            ioe.printStackTrace();
          } catch (InterruptedException e) {
            e.printStackTrace();
          }
        }
        try {
          rs = con.executeQuery(select);
          while (rs.next()) {
            status = rs.getInt("status");
            System.out.println("检测当前状态status:"+status);
          }
        } catch (SQLException e) {
          e.printStackTrace();
        }
        try {
          Thread.sleep(5000);
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
    }
  }

  public static void main(String[] args) {
    ReStart res = new ReStart();
    res.run();
  }

}

package datacollect;

import java.sql.ResultSet;
import java.sql.SQLException;

import databasetool.DBtool;

public class ExitMain implements Runnable {

  @Override
  public void run() {
    DBtool dbtool = new DBtool();
    int status = 0;// 0：表示不需要重启
    ResultSet rs = null;
    String select = "select * from restart";
    String restar = "update restart set status = '2'";// 关闭了程序，等待重启

    // 写日志相关内容

    while (true) {

      try {
        rs = dbtool.executeQuery(select);
        while (rs.next()) {
          status = rs.getInt("status");
        }
      } catch (SQLException e) {
        e.printStackTrace();
      }
      if (status == 1) {// 1：表示等待关闭程序
        System.out.println("status状态为1，表示需要关闭当前程序！");
        try {
          int result = dbtool.executeUpdate(restar);
          System.out.println("程序马上就被关闭，并将status状态设置为2，表示程序关闭了，需要重启！");
        } catch (SQLException e) {
          e.printStackTrace();
        }
        System.exit(0);
      }
      try {
        Thread.sleep(5000);
      } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
  }

  public static void main(String[] args) {
    ExitMain extm = new ExitMain();
    extm.run();
  }

}

package databasetool;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBtool {

  private Connection connection = null;
  public Statement statement = null;
  private ResultSet result = null;


  public DBtool() {
    try {
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        String url = "jdbc:sqlserver://localhost:1433;databaseName=tianjincollect;user=sa;password=123456";
        connection = DriverManager.getConnection(url);
        statement = connection.createStatement();      
      } catch (SQLException ex) {
        System.out.println(ex.getMessage());
      } catch (ClassNotFoundException ex) {
        System.out.println(ex.getMessage());
      }
  }

  public ResultSet executeQuery(String sql) throws SQLException {
    try {
      result = statement.executeQuery(sql);
    } catch (SQLException se) {
      System.out.println("ERROR:" + se.getMessage());     
    }
    return result;
  }

  public int executeUpdate(String sql) throws SQLException {
    int updatenum = 0;
    try {
      updatenum = statement.executeUpdate(sql);
      return updatenum;
    } catch (SQLException se) {
      System.out.println("ERROR:" + se.getMessage()); 
    }
    return updatenum;
  }

  public void free() throws SQLException {
    try {
      if (result != null)
        result.close();
      if (statement != null)
        statement.close();
      if (connection != null)
        connection.close();
    } catch (SQLException se) {
      System.out.println("ERROR:" + se.getMessage());
    }
  }
  public static void main(String[] args) {
    DBtool con = new DBtool();
    ResultSet rs = null;
    String sql = "select * from restart";
    try {
      rs = con.executeQuery(sql);
      while(rs.next()){
        int status = rs.getInt("status");
        System.out.println(status);
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }
    sql = "update restart set status = '1'";
    try {
      int result = con.executeUpdate(sql);
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
}