我想用Java代码与linux终端通信。我想存储输出并使用它。我按照给定链接中的说明实施了以下代码。
我希望获得完整的帮助终端输出。但是无论对于标准命令还是mosquitto命令,我都无法从输入流中得到任何东西。错误在哪里?还是应该完全不同?
Stackoverflow链接:how to run a command at terminal from java program?
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class LinuxInputStream
{
public static void main(String[] args)
{
// Linux Terminal
String prefix = "/bin/bash";
String terminalCommand = "help";
String mosquittoCommand = "mosquitto --help";
ProcessBuilder pb1 = new ProcessBuilder(
new String[] {prefix, terminalCommand});
ProcessBuilder pb2 = new ProcessBuilder(
new String[] {prefix, mosquittoCommand});
try
{
executeCommand(pb1);
}
catch (IOException e)
{
System.out.println("IO Error in Terminal Command execution!");
e.printStackTrace();
}
try
{
executeCommand(pb2);
}
catch (IOException e)
{
System.out.println("IO Error in Mosquitto Command execution!");
e.printStackTrace();
}
}
private static void executeCommand(ProcessBuilder pb) throws IOException
{
Process terminalCommandProcess = pb.start();
InputStream inputStream = terminalCommandProcess.getInputStream();
BufferedReader br = new BufferedReader(
new InputStreamReader(inputStream));
String line;
int i = 0;
while ((line = br.readLine()) != null)
{
System.out.println("Line: " + line);
i++;
}
if (i == 0) System.out.println("Nothing read from input stream");
}
}
输出:
什么也没从输入流中读取
什么也没从输入流中读取
答案 0 :(得分:0)
在帖子发布后立即找到了解决方案:“-c”部分丢失。正确的代码段为:
// Linux Terminal
String prefix = "/bin/bash";
String c = "-c";
String terminalCommand = "help";
String mosquittoCommand = "mosquitto --help";
ProcessBuilder pb1 = new ProcessBuilder(
new String[] {prefix, c, terminalCommand});
ProcessBuilder pb2 = new ProcessBuilder(
new String[] {prefix, c, mosquittoCommand});