Java执行CMD命令并等待返回结果

最新推荐文章于 2023-06-20 18:12:35 发布

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最新推荐文章于 2023-06-20 18:12:35 发布

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分类专栏： Java 文章标签： java command cmd

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本文提供了一个使用Java代码查询系统中安装的Java版本的方法。通过执行'java-version'命令并捕获其标准输出和错误输出，该示例能够获取并打印Java的版本信息。

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执行命令部分

        try {
            String command = "java -version";
            Process p = Runtime.getRuntime().exec(command);
            StreamCaptureThread errorStream = new StreamCaptureThread(p.getErrorStream());
            StreamCaptureThread outputStream = new StreamCaptureThread(p.getInputStream());
            new Thread(errorStream).start();
            new Thread(outputStream).start();
            p.waitFor();

            result = command + "\n" + outputStream.output.toString()
                    + errorStream.output.toString();
            System.out.print(result);
        } catch (Exception e) {
            e.printStackTrace();
        }

StreamCaptureThread

    private class StreamCaptureThread implements Runnable {
        InputStream stream;
        StringBuilder output;

        public StreamCaptureThread(InputStream stream) {
            this.stream = stream;
            this.output = new StringBuilder();
        }

        public void run() {
            try {
                try {
                    BufferedReader br = new BufferedReader(
                            new InputStreamReader(this.stream));
                    String line = br.readLine();
                    while (line != null) {
                        if (line.trim().length() > 0) {
                            output.append(line).append("\n");
                        }
                        line = br.readLine();
                    }
                } finally {
                    if (stream != null) {
                        stream.close();
                    }
                }
            } catch (IOException ex) {
                ex.printStackTrace(System.err);
            }
        }
    }