shell 交互

java执行shell交互：

方法一：

用linux自带的expect

 expect -c 'spawn /opt/hadoop-2.7.4/bin/hadoop namenode -format 
expect "Proceed formatting"
send "Y\r"
expect "filesystem in QJM "
send "Y\r"
interact '

java中要转义：runcmd(" expect -c 'spawn /opt/hadoop-2.7.4/bin/hadoop namenode -format\n" +
        "expect \"Proceed formatting\"\n" +
        "send \"Y\\r\"\n" +
        "expect \"filesystem in QJM \"\n" +
        "send \"Y\\r\"\n" +
        "interact '\n");

方法二：

封装jsch，使用流处理