日志文件读取方法

文件读取

package test;

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * @author lw
 * @createTime 2018/8/3 16:55
 * @description 日志服务器
 */
public class LogSvr {

    private long lastTimeFileSize = 0;

    /**
     * 实时读取指定文件的内容
     * @param logFile
     * @throws FileNotFoundException
     */
    public void realtimeShowLog(File logFile) throws FileNotFoundException {
        //指定文件可读可写
        final RandomAccessFile randomAccessFile = new RandomAccessFile(logFile, "rw");
        //启动一个线程每10秒钟读取新增的日志信息
        ScheduledExecutorService exec = Executors.newScheduledThreadPool(1);
        exec.scheduleWithFixedDelay(new Runnable() {
            @Override
            public void run() {
                try {
                    //获得变化部分的
                    randomAccessFile.seek(lastTimeFileSize);
                    String tmp = "";
                    while ( (tmp = randomAccessFile.readLine()) != null) {
                        // 输出文件内容
                        System.out.println(new String(tmp.getBytes("ISO8859-1")));
                        lastTimeFileSize = randomAccessFile.length();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }, 0, 10, TimeUnit.SECONDS);

    }

    private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String msgInfo = "this is a message";

    /**
     * 实时写入日志到指定文件
     * @throws IOException
     */
    public void writerLog() throws IOException {
        final File logFile = new File("D:\\driver\\loadtest\\debug\\mock.log");
        if(!logFile.exists()) {
            logFile.createNewFile();
        }
        //启动一个线程每2秒钟向日志文件写一次数据
        ScheduledExecutorService exec =  Executors.newScheduledThreadPool(1);
        exec.scheduleWithFixedDelay(new Runnable(){
            public void run() {
                try {
                    if(logFile == null) {
                        throw new IllegalStateException("logFile can not be null!");
                    }
                    Writer txtWriter = new FileWriter(logFile,true);
                    txtWriter.write(dateFormat.format(new Date()) +"\t"+ msgInfo +"\n");
                    txtWriter.flush();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }, 0, 2, TimeUnit.SECONDS);
    }

    public static void main(String[] args) throws Exception {
        LogSvr view = new LogSvr();
        view.writerLog();
        final File tmpLogFile = new File("D:\\driver\\loadtest\\debug\\mock.log");
        view.realtimeShowLog(tmpLogFile);
    }

}

linux文件命令读取

package test;

import java.io.*;
import java.nio.charset.Charset;
import java.util.Properties;

import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.letv.shop.et.service.impl.JmeterServiceImpl;
import org.apache.commons.io.IOUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * @author lw
 * @createTime 2018/8/3 15:49
 * @description ssh登陆主机 输入密码登陆并执行命令
 */
public class LinuxShh {

    private static Logger logger = LogManager.getLogger(LinuxShh.class);

    final static String userName = "root";// 用户名
    final static String password = "76214489";// 密码
    final static String host = "182.31.54.221";// 服务器地址
    final static int port = 22;// 端口号
    final static int timeout = 60000000;

    /**
     * <dependency>
     * <groupId>com.jcraft</groupId>
     * <artifactId>jsch</artifactId>
     * <version>0.1.54</version>
     * </dependency>
     */
    public static void main(String[] args) throws JSchException, IOException {
        JSch jsch = new JSch(); // 创建JSch对象
        //String cmd = "vmstat 1 1";// 要运行的命令
        String cmd = "uname -a && date && uptime && who && vmstat 1> /home/linux_shell/m/vmstat.txt";
        Session session = jsch.getSession(userName, host, port); // 根据用户名,主机ip,端口获取一个Session对象
        session.setPassword(password); // 设置密码
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config); // 为Session对象设置properties
        session.setTimeout(timeout); // 设置timeout时间
        session.connect(); // 通过Session建立链接
        ChannelExec channelExec = (ChannelExec) session.openChannel("exec");
        channelExec.setCommand(cmd);
        channelExec.setInputStream(null);
        channelExec.setErrStream(System.err);
        channelExec.connect();
        InputStream in = channelExec.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(in, Charset.forName("UTF-8")));
        String buf = "/home/linux_shell/m/vmstat.txt";

        StringBuffer sb = new StringBuffer();

        System.out.println("您的IP是:" + host);
        logger.info("您的IP是:" + host);
        System.out.println("以下是:系统资源信息:");

        /*final File tmpLogFile = new File("/home/linux_shell/m/vmstat.txt");
        LogSvr.realtimeShowLog(new File(String.valueOf(tmpLogFile)));*/
        while ((buf = reader.readLine()) != null) {
            sb.append(buf);
            System.out.println(buf);// 打印控制台输出
        }
        reader.close();
        channelExec.disconnect();
        if (null != session) {
            session.disconnect();
        }

       /* Process p = Runtime.getRuntime().exec("ls -al /");
        InputStream inputStream = p.getInputStream();
        OutputStream out = new FileOutputStream("/tmp/list.out");
        byte[] b = new byte[1024];
        int r;
        while((r=inputStream.read(b))>-1)
            out.write(b,0,r);
        out.flush();
        out.close();*/

        /*
        for (int i = 0; i < 10; i++) {
            String res = exeCommand(host, port, userName, password, cmd);

            System.out.println(res);
        }*/

    }

    public static String exeCommand(String host, int port, String user, String password, String command) throws JSchException, IOException {

        JSch jsch = new JSch();
        Session session = jsch.getSession(user, host, port);
        session.setConfig("StrictHostKeyChecking", "no");
        session.setPassword(password);
        session.connect();
        session.setTimeout(timeout); // 设置timeout时间
        ChannelExec channelExec = (ChannelExec) session.openChannel("exec");
        InputStream in = channelExec.getInputStream();
        channelExec.setCommand(command);
        channelExec.setErrStream(System.err);
        channelExec.connect();
        String out = IOUtils.toString(in, "UTF-8");
        channelExec.disconnect();
        session.disconnect();

        return out;
    }

}
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