Question

我在主目录test.sh中有一个名为~的shell脚本文件。我想用java执行shell文件。我使用以下代码：

Runtime runtime = Runtime.getRuntime();
        Process process = null;
        String cmd[] = {"/bin/bash","~/test.sh"};
        String[] env = {"PATH=/bin:/usr/bin/"};

        try
        {
            process = runtime.exec(cmd,env);
            process.waitFor();

            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            StringBuilder stringBuilder = new StringBuilder();

            String line = reader.readLine();
            stringBuilder.append(line);

            System.out.println("The token is " + stringBuilder.toString() );

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

当我尝试执行以下程序时，我得到null，结果如下：

The token is null

我犯了错误？

编辑：

test.sh只有

echo "Hello"

Answer 1

您需要在进程处于活动状态时从流中读取。在waitFor（）返回后访问getInputStream是没有意义的，因为那时进程已经死了。你应该开始一个线程来读取getInputStream（）。

类似的东西：

process = runtime.exec(cmd,env);

final BufferedReader reader = new BufferedReader(new InputStreamReader (process.getInputStream()));
final StringBuilder stringBuilder = new StringBuilder();

new Thread () {
    public void run () {
        String line = reader.readLine();
        stringBuilder.append(line);
    }
}.start ();
process.waitFor();

执行shell脚本始终在Java中返回null

编辑：

1 个答案: