如何在另一个java程序中运行java可执行jar

我知道之前已经问过这个问题，但这些答案没有给我答案。

我想在我的java程序中执行一个exec jar文件，并将执行jar的输出变为字符串。 下面是我到目前为止使用的代码没有成功。

cmdlink = "java -jar iwtest-mac.jar"+" "+cmd; System.out.println(cmdlink); Process process = Runtime.getRuntime().exec(cmdlink); BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())); while ((reader.readLine()) != null) { st = reader.readLine(); } process.waitFor(); 

我尝试过的另一个代码如下：

 String cmdlink = "iwtest-mac.jar "+cmd; ProcessBuilder pb = new ProcessBuilder("java", "-jar", cmdlink); //cmd here is a string that contains inline arguments for jar. pb.redirectErrorStream(true); pb.directory(new File("C:\\Users\\Dharma")); System.out.println("Directory: " + pb.directory().getAbsolutePath()); Process p = pb.start(); InputStream is = p.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(is)); for (String line = br.readLine(); line != null; line = br.readLine()) { System.out.println( line ); p.waitFor(); 

以上两个都不适合我。 任何建议表示赞赏。

Answer 1

这对我有用..

 public class JarRunner { public static void main(String[] args) { ProcessBuilder pb = new ProcessBuilder("java", "-jar", "C:\\JCcc.jar"); pb.directory(new File("C:\\")); try { Process p = pb.start(); LogStreamReader lsr = new LogStreamReader(p.getInputStream()); Thread thread = new Thread(lsr, "LogStreamReader"); thread.start(); } catch (IOException e) { e.printStackTrace(); } } } class LogStreamReader implements Runnable { private BufferedReader reader; public LogStreamReader(InputStream is) { this.reader = new BufferedReader(new InputStreamReader(is)); } public void run() { try { String line = reader.readLine(); while (line != null) { System.out.println(line); line = reader.readLine(); } reader.close(); } catch (IOException e) { e.printStackTrace(); } } } 

这就是Docs所说的 –

 ProcessBuilder pb = new ProcessBuilder("myCommand", "myArg1", "myArg2"); 

您可以在构造函数中传递任意数量的参数。

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