如何使用Java将输入值传递给Shell脚本 [英] How to pass the input value to shell script using java

问题描述

我已经创建了shell脚本来添加两个数字.我想从Java执行该Shell脚本，而我正在使用Jsch库.你能帮我这个忙吗?

I have created the shell script to add two numbers. I want to execute that shell script from java and I am using Jsch library. Can you please help me on this.

first_num=0
second_num=0
echo -n "Enter the first number-->"
read first_num
echo -n "Enter the second number-->"
read second_num
echo "first number + second number = $ (( first_num + second_num ))"

是的.我已经在"Jsch"站点中检查了示例，但是我无法将输入内容输入到Shell脚本中.

Yes. I have checked examples in "Jsch" sites, But i am not able to enter the input to shell script.

我按照你说的尝试过.请参见以下代码

I tried as you said. Please see the following piece of code

String command = "bash /home/opt/addtwonumber.sh 1 2"

我更改了下面提到的shell脚本

And I changed the shell script mentioned below

$first_num
$second_num
echo "first number + second number = $ (( first_num + second_num ))"

但是它不起作用.我得到类似的结果

But it doesn't work. i am getting the results like

first_number + second_number  = 0

推荐答案

示例:

    String user = "USERNAME";
    host = "HOSTNAME";

    UserInfo ui=new MyUserInfo();
    session.setUserInfo(ui);
    session.connect();

    Session session=jsch.getSession(user, host, 22);
    String command = "YOUR_SCRIPTFILE_HERE PARAMETER_ONE PARAMETER_TWO";
    Channel channel = session.openChannel("exec");
    ((ChannelExec) channel).setCommand(command);

    channel.setInputStream(null);

    ((ChannelExec) channel).setErrStream(System.err);

    InputStream in = channel.getInputStream();

    channel.connect();

    byte[] tmp = new byte[1024];
    while (true) {
        while (in.available() > 0) {
            int i = in.read(tmp, 0, 1024);
            if (i < 0)
                break;
            System.out.print(new String(tmp, 0, i));
        }
        if (channel.isClosed()) {
            if (in.available() > 0)
                continue;
            System.out.println("exit-status: " + channel.getExitStatus());
            break;
        }
        try {
            Thread.sleep(1000);
        } catch (Exception ee) {
        }
    }
    channel.disconnect();
    session.disconnect();

提醒您:切勿在任何可用于生产的代码中使用while(true)，多数民众赞成在...不好的代码，无论您捕获多少异常，它都会在某些时候中断/生成死锁，无论您多久插入一次break这样的语句-都会发生.

Mind you : never use while(true) in any production-ready code, thats just ... bad code and it will break / generate deadlocks at some point, no matter how many exceptions you catch, no matter how often you insert statements like break - it will happen.

因此，您所需要做的就是将参数立即放在脚本文件之后，并且应该就此放置它-但仅适用于命令行参数，AFAIK在脚本运行时不容易输入参数-read将不起作用为您服务，因为您的脚本显然不是本地的.您不能使用需要本地输入的脚本，而需要切换到命令行参数-即$1，$2等.

So all you need to do is place your parameters immediately after your scriptfile and that should be about it - but that only works with commandline parameters, AFAIK it isnt easily possible to input parameters during script runtime - read will not work for you as your script apparently isnt local. You cant use scripts which require local input, you need to switch to commandline parameters - namely $1, $2 and so on.

此处显示MyUserInfo的界面: *单击

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