java执行linux shell命令

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package com.pasier.xxx.util;import java.io.IOException;import java.io.InputStream;import java.nio.charset.Charset;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import ch.ethz.ssh2.ChannelCondition;import ch.ethz.ssh2.Connection;import ch.ethz.ssh2.Session;import ch.ethz.ssh2.StreamGobbler;public class RmtShellExecutor {    private static final Logger LOG = LoggerFactory.getLogger(RmtShellExecutor.class);    private Connection conn;    private String ip;    private String usr;    private String psword;    private String charset = Charset.defaultCharset().toString();    private static final int TIME_OUT = 1000 * 5 * 60;    public RmtShellExecutor(String ip, String usr, String ps) {        this.ip = ip;        this.usr = usr;        this.psword = ps;    }    private boolean login() throws IOException {        conn = new Connection(ip);        conn.connect();        return conn.authenticateWithPassword(usr, psword);    }    public String exec(String cmds) throws IOException {        InputStream stdOut = null;        InputStream stdErr = null;        String outStr = "";        String outErr = "";        int ret = -1;        try {            if (login()) {                Session session = conn.openSession();                session.execCommand(cmds);                stdOut = new StreamGobbler(session.getStdout());                outStr = processStream(stdOut, charset);                LOG.info("caijl:[INFO] outStr=" + outStr);                stdErr = new StreamGobbler(session.getStderr());                outErr = processStream(stdErr, charset);                LOG.info("caijl:[INFO] outErr=" + outErr);                session.waitForCondition(ChannelCondition.EXIT_STATUS, TIME_OUT);                ret = session.getExitStatus();            } else {                LOG.error("caijl:[INFO] ssh2 login failure:" + ip);                throw new IOException("SSH2_ERR");            }        } finally {            if (conn != null) {                conn.close();            }            if (stdOut != null)                stdOut.close();            if (stdErr != null)                stdErr.close();        }        return outStr;    }    private String processStream(InputStream in, String charset) throws IOException {        byte[] buf = new byte[1024];        StringBuilder sb = new StringBuilder();        while (in.read(buf) != -1) {            sb.append(new String(buf, charset));        }        return sb.toString();    }    public static void main(String[] args) {        String usr = "root";        String password = "12345";        String serverIP = "11.22.33.xx";        String shPath = "/root/ab.sh";        RmtShellExecutor exe = new RmtShellExecutor(serverIP, usr, password);        String outInf;        try {            outInf = exe.exec("sh " + shPath + " xn");            System.out.println("outInf= " + outInf);        } catch (IOException e) {            e.printStackTrace();        }    }}
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