与Java中的Linux Shell提示进行交互

Question

Executor exec = new DefaultExecutor();
exec.setWorkingDirectory("/var/java/apache-tomcat-7.0.47/webapps/Telegram/tg")
CommandLine cl = new CommandLine("bin/telegram-cli -k tg-server.pub -W -U root");
int exitvalue = exec.execute(cl);

我如何获得此命令的输出：

exec.execute(cl);

并在telegram-cli命令提示符下运行其他相关命令，例如contact_list，msg contact“ Hello world”；

Answer 1

在我看来，仅使用ProcessBuilder会更容易。

ProcessBuilder pb = new ProcessBuilder("bin/telegram-cli","-k","tg-server.pub","-W","-U","root");
pb.directory(new File("/var/java/apache-tomcat-7.0.47/webapps/Telegram/tg"));
Process p = pb.start();
try (BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(p.getOutputStream()),true)) {
    String line = null;
    pw.println("contact_list");
    while ((line = br.readLine()) != null) {
        System.out.println("line = " + line);
    }
}

更新似乎需要清除使用PrintWriter进行的写入。 您可以通过调用pw.flush()或向PrintWriter构造函数添加第二个参数true来实现。 我不知道telegram-cli的命令，但是您需要添加一个将产生可用于标识何时退出的输出的命令。 这是使用/ bin / sh的示例。

ProcessBuilder pb = new ProcessBuilder("/bin/sh");
Process p = pb.start();
try (BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(p.getOutputStream()),true)) {
    String line = null;
    pw.println("ls");
    pw.println("pwd");
    pw.println("echo quit"); // this gives me output I can test for to break the loop
    pw.flush();
    while ((line = br.readLine()) != null && !line.contains("quit")) {
        System.out.println("line = " + line);
    }
}
int retcode = p.waitFor();
System.out.println("process ended with " + retcode);

产生以下输出：

line = build
line = build.xml
line = dist
line = manifest.mf
line = nbproject
line = src
line = /home/shackle/NetBeansProjects/JavaApplication20
process ended with 0