Question

我希望在Java代码继续之前完成一个过程。考虑代码

ProcessBuilder pb = new ProcessBuilder(COMMAND);
LOGGER.info(String.join(" ", COMMAND));
pb.redirectErrorStream(true);
Process cmdProces = pb.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(cmdProces.getInputStream()));
String line;
while ((line = reader.readLine()) != null) System.out.println("tasklist: " + line);
boolean rc = cmdProces.waitFor(10, TimeUnit.SECONDS);
LOGGER.info("Script executed ");

因为这是在调度器内部，该调度器每30秒运行一次作业，所以进程没有在等待。我开始下一个命令。如何确保Java进程等待COMMAND完成并且不会异步运行？

Answer 1

也许使用Future是个好主意。

CompletableFuture<String> completableFuture
  = CompletableFuture.supplyAsync(() -> {
// some pb code
Process cmdProces = pb.start();
});

CompletableFuture<String> future = completableFuture
  .thenApply(cmdProcess -> {
    BufferedReader reader = new BufferedReader(new 
    InputStreamReader(cmdProces.getInputStream()));
    String line;
    while ((line = reader.readLine()) != null) System.out.println("tasklist: " + line);
    boolean rc = cmdProces.waitFor(10, TimeUnit.SECONDS);
    LOGGER.info("Script executed ");
});

如何在Java中让进程等待

1 个答案: