java连接ssh服务

public class Shell {
private static Logger logger = Logger.getLogger(Shell.class);
private String ip;//远程主机的IP地址
private String username;//远程主机的用户名
private String password;//远程主机的密码
private int port;//远程主机端口
public static final int DEFAULT_SSH_PORT = 22;
private ArrayList<String> stdout;//保存输出的内容

public String getIp() {
return ip;
}

public void setIp(String ip) {
this.ip = ip;
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public int getPort() {
return port;
}

public void setPort(int port) {
this.port = port;
}

public ArrayList<String> getStdout() {
return stdout;
}

public Shell() {
stdout = new ArrayList<String>();
}

public Shell(final String ip, final String username, final String password) {
this.ip = ip;
this.username = username;
this.password = password;
stdout = new ArrayList<String>();
}

public int execute(final String command) {
int returnCode = 0;
JSch jsch = new JSch();
Session session = null;

try {
//创建session并且打开连接，因为创建session之后要主动打开连接
if (port == 0)
session = jsch.getSession(username, ip, DEFAULT_SSH_PORT);
else
session = jsch.getSession(username, ip, port);

session.setPassword(password);

//关闭主机密钥检查，否则会导致连接失败，重要！！！
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);

logger.info("连接服务器" + session.getHost());

session.connect();
//打开通道，设置通道类型，和执行的命令
Channel channel = session.openChannel("exec");
ChannelExec channelExec = (ChannelExec) channel;
channelExec.setCommand(command);

channelExec.setInputStream(null);
BufferedReader input = new BufferedReader(new InputStreamReader((channelExec.getInputStream())));
channelExec.connect();
logger.info("The remote command is:" + command);
//接受远程服务器执行命令的结果

String line = null;
logger.info("stdout信息开始打印");
while ((line = input.readLine()) != null) {
stdout.add(line);
logger.info(line);
}
logger.info("stdout信息打印结束");
input.close();

//得到returnCode
if (channelExec.isClosed())
returnCode = channelExec.getExitStatus();

//关闭通道
channelExec.disconnect();
//关闭session
session.disconnect();

} catch (JSchException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return returnCode;
}

@Test
public void run() {

Shell shell = new Shell();
shell.setIp("10.59.81.11");
shell.setUsername("www");
shell.setPassword("www");
shell.setPort(22);
logger.info(shell.execute("ls -l"));

}
}