简单地对Unix系统访问

在Unix端布署一RMI应用,使用Runtime.exec(String command)方法实现
InterfaceFile.java

public interface Cmd extends Remote {
	/**
	 * 执行服务器的命令
	 * 
	 * @param command
	 * @return
	 * @throws RemoteException
	 */
	public String executeCommand(String command)
			throws RemoteException;
}

Cmd_Impl.java

public String executeCommand(String command) 
			throws RemoteException {
		StringBuffer result = new StringBuffer();
		try {
			Process proc = Runtime.getRuntime().exec(command);
			InputStream is = proc.getInputStream();
			BufferedReader reader = new BufferedReader(new InputStreamReader(is));
			String str;
			
			while((str = reader.readLine()) != null){
				result.append(str);
				result.append("\n");
			}
			reader.close();
			is.close();
			
			return result.toString();
		} catch (IOException e) {
			log.error("Exception has occoured when executing [ "+command+" ] command...",e);
			return result.toString();
		}
	}

生成_Stub.class文件
… …

另一实现,通过使用commons-net组件的telnet包来实现

 import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.SocketException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.net.telnet.TelnetClient;

/**
 * 访问后台文件服务器类
 */ 
public class AccessRemoteServer {
	private InputStream in;
	private PrintStream out;
	private final TelnetClient tc = new TelnetClient();
	private final String osTag = ">";
	public static final String CONFIG_FILE_PATH = "/conf/server.properties";	// 配置文件所在路径
	
	
	/**
	 * 连接服务器
	 * 
	 * @return
	 */
	public boolean connect(){
		try {
			Map configs = getConfig();
			
			if(configs != null){
				String host = configs.get("host").toString();
				int port = Integer.parseInt(configs.get("port").toString());
				String user = configs.get("user").toString();
				String pwd = configs.get("pwd").toString();
				
				tc.connect(host, port);
				in = tc.getInputStream();
				out = new PrintStream(tc.getOutputStream());
				
				readInfo(in,"login: ");
				out.println(user);
				out.flush();
				readInfo(in,"Password: ");
				out.println(pwd);
				out.flush();
				readInfo(in,">");
				
				return true;
			}
			else{
				return false;
			}
		} catch (SocketException e) {
			e.printStackTrace();
			return false;
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		} 
		
	}
	
	/**
	 * 执行命令
	 * 
	 * @param command
	 * @return
	 */
	public String executeCmd(String command){
		boolean flag = connect();
		
		if(flag){
			String result = "";
			try {
				result = executeCommand(command, in, out, osTag);
				tc.disconnect();
				
				return "执行结果:\n\n"+result;
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				return result;
			}
			
			
		}
		else{
			return "连接服务器失败!";
		}
	}
	
	private String readInfo(InputStream in,String pattern){
		try{
			char last = pattern.charAt(pattern.length()-1);
			StringBuffer rs = new StringBuffer();
			
			char ch = (char)in.read();
			while(true){
				rs.append(ch);
				
				if(ch == last){
					if(rs.toString().endsWith(pattern)){
						return rs.toString();
					}
				}
				ch = (char)in.read();
			}
		} catch(IOException e){
			e.printStackTrace();
		}
		
		return null;
	}
	
	private String executeCommand(String command,InputStream in,PrintStream out,String endStr){
		out.println(command);
		out.flush();
		String result = readInfo(in,endStr);
		return result;
	}
	
	/**
	 * 获取文件服务器的相关配置信息
	 * 
	 * @return		配置信息
	 */
	public Map getConfig(){
		try{
			Map configs = new HashMap();
			Properties prop = new Properties();
			InputStream in = AccessRemoteServer.class.getResourceAsStream(CONFIG_FILE_PATH);
		
			prop.load(in);
			configs.put("user", prop.getProperty("server.user"));
			configs.put("pwd", prop.getProperty("server.password"));
			configs.put("host", prop.getProperty("server.host"));
			configs.put("port", prop.getProperty("server.port"));
			
			return configs;
		} catch (IOException e){
			System.out.println("读取服务器配置信息失败!");
			e.printStackTrace();
			return null;
		}
	} 
	
	// 测试程序
	public static void main(String[] args){
		AccessRemoteServer ser = new AccessRemoteServer();
		System.out.println(ser.executeCmd("ls -F ./bin"));
	}