Java and Linux Script Operations: How to Implement Remote Command Execution

Java and Linux script operations: implementing remote command execution

Overview:
In actual application development, we often encounter the need to execute commands on a remote server needs. This article will introduce how to implement remote command execution through Java and Linux scripts, and provide specific code examples.

1. Java implements remote command execution
   In Java, you can use the JSch library to implement remote command execution. JSch is an SSH2 protocol library implemented in pure Java, which can be used to establish SSH connections, execute commands, transfer files and other operations. The following is a simple Java code example:

import com.jcraft.jsch.*;

public class RemoteCommandExecutor {

    public static void main(String[] args) {
        String host = "远程服务器地址";
        int port = 22;
        String username = "用户名";
        String password = "密码";

        try {
            JSch jsch = new JSch();
            Session session = jsch.getSession(username, host, port);
            session.setPassword(password);
            session.setConfig("StrictHostKeyChecking", "no");
            session.connect();

            String command = "要执行的命令";
            Channel channel = session.openChannel("exec");
            ((ChannelExec) channel).setCommand(command);
            channel.setInputStream(null);
            ((ChannelExec) channel).setErrStream(System.err);

            InputStream in = channel.getInputStream();
            channel.connect();

            byte[] buffer = new byte[1024];
            while (in.read(buffer) != -1) {
                System.out.println(new String(buffer));
            }

            channel.disconnect();
            session.disconnect();
        } catch (JSchException | IOException e) {
            e.printStackTrace();
        }
    }
}

In the code, we first create a JSch object and then create an SSH session through the getSession() method. Next set the session username, password, and remote server address and port number. Establish an SSH connection with the remote server by calling the connect() method.

Then create a channel for command execution through the openChannel("exec") method and set the command to be executed. Read the output of the command through the input stream and print it to the console. Finally close the channel and session.

2. Linux script to implement remote command execution
   In Linux systems, you can use the SSH protocol to implement remote command execution. The following is a simple script example:

#!/bin/bash
ssh 远程服务器地址 "要执行的命令"

Save the above script as a .sh file, and use the chmod command to give execution permissions to execute the script.

In the script, we use the ssh command to establish an SSH connection, and perform specific operations through commands within double quotes. When the script is executed, an SSH connection request is automatically sent to the remote server and the specified command is executed.

It should be noted that when using a script to execute remote commands, you need to set up the SSH configuration in advance to ensure that the connection can be successfully established and the command can be executed.

Summary:
This article introduces how Java and Linux scripts implement remote command execution, and provides specific code examples. Through these methods, remote server management and operation can be easily implemented in application development. Whether using Java or Linux scripts, you can choose the appropriate method to implement remote command execution according to specific needs.

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