java远程读取linux文件

所需依赖包

  
  
   ch.ethz.ganymed
   ganymed-ssh2
   262
  

java代码

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;

public class TestRemoteConnect {
 public static void main(String[] args) {
  String path = "/home/lyf/apps/test/info";
  String hostName = "192.168.1.106";
  int port = 22;
  String username = "root";
  String password = "123456";
  Connection ss = getConnect(hostName, username, password, port);
  if (fileExist(path, ss)) {
   readLogFile(path, ss);
  }
 }

 public static Connection getConnect(String hostName, String username, String password, int port) {
  Connection conn = new Connection(hostName, port);
  try {
   // 连接到主机
   conn.connect();
   // 使用用户名和密码校验
   boolean isconn = conn.authenticateWithPassword(username, password);
   if (!isconn) {
    System.out.println("用户名称或者是密码不正确");
   } else {
    System.out.println("服务器连接成功.");
    return conn;
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  return null;
 }

 public static boolean fileExist(String path, Connection conn) {
  if (conn != null) {
   Session ss = null;
   try {
    ss = conn.openSession();
    ss.execCommand("ls -l ".concat(path));
    InputStream is = new StreamGobbler(ss.getStdout());
    BufferedReader brs = new BufferedReader(new InputStreamReader(is));
    String line = "";
    while (true) {
     String lineInfo = brs.readLine();
     ;
     if (lineInfo != null) {
      line = line + lineInfo;
     } else {
      break;
     }
    }
    brs.close();
    if (line != null && line.length() > 0 && line.startsWith("-")) {
     return true;
    }
   } catch (Exception e) {
    e.printStackTrace();
   } finally {
    // 连接的Session和Connection对象都需要关闭
    if (ss != null) {
     ss.close();
    }
   }
  }

  return false;
 }

 public static void readLogFile(String path, Connection conn) {

  if (conn != null) {
   Session ss = null;
   try {
    ss = conn.openSession();
    ss.execCommand("tail -100 ".concat(path));
    InputStream is = new StreamGobbler(ss.getStdout());
    BufferedReader brs = new BufferedReader(new InputStreamReader(is));
    while (true) {
     String line = brs.readLine();
     if (line == null) {
      break;
     } else {
      System.out.println(line);
     }
    }
    brs.close();
   } catch (Exception e) {
    e.printStackTrace();
   } finally {
    // 连接的Session和Connection对象都需要关闭
    if (ss != null) {
     ss.close();
    }
    if (conn != null) {
     conn.close();
    }
   }
  }
 }
}