How to use Linux script operations to implement remote login in Java

How to use Linux script operations to implement remote login in Java

Overview:
Remote login is to use one computer to log in to other computers in a network environment a way to operate on. In Linux systems, we usually use the SSH protocol for remote login. This article will introduce how to implement remote login operations by calling Linux scripts in Java, and give specific code examples.

Step 1: Write Linux script code
First, we need to write a Linux script for remote login through the SSH protocol. Here is a simple sample script code (login.sh):

!/bin/bash

ssh -t -t @

Note:

• The first line specifies the shell type used by the script as bash.
• The second line uses the ssh command to achieve remote login.
• Fill in the remote login username and the IP address or domain name of the target host in the and positions respectively.

Note: Before using this script, you need to ensure that your local computer has been configured with SSH key authentication to avoid having to enter a password every time.

Step 2: Call the Linux script in Java
Next, we use Java code to call the Linux script to achieve remote login. Here is a simple sample code:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class RemoteLogin {

public static void main(String[] args) {
    String command = "sh /path/to/login.sh"; // 替换为实际的脚本路径
    String output = executeCommand(command);
    System.out.println(output); // 输出远程登录的结果
}

private static String executeCommand(String command) {
    StringBuffer output = new StringBuffer();

    Process p;
    try {
        p = Runtime.getRuntime().exec(command);
        p.waitFor();
        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));

        String line = "";
        while ((line = reader.readLine()) != null) {
            output.append(line + "

");

        }

    } catch (IOException | InterruptedException e) {
        e.printStackTrace();
    }

    return output.toString();
}

}

Note:

• In the main method, we need to replace the value of the command variable with The path to the actual login script.
• The executeCommand method is used to execute the Linux script and return the execution result.
• We call the Linux script through the Runtime.getRuntime().exec() method.
• p.waitFor() is used to wait for the script execution to complete.
• Use BufferedReader to read the output of the script and store it into a StringBuffer object.

Steps Three: Run the code and view the results
After completing the code writing, we can run the Java program and view the results of remote login. The console output will display the remote terminal interface after login.

Summary:
Through the above steps, we successfully called Linux scripts in Java code to implement remote login operations. You can modify and extend the code according to actual needs to meet different remote operation needs.

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