Java：等待exec进程直到它退出

我在Windows中运行一个java程序，从Windows事件中收集日志。 创建一个.csv文件，在该文件上执行某些操作。

命令被执行和管道。 如何让我的Java程序等到进程完成？

这是我正在使用的代码片段：

Runtime commandPrompt = Runtime.getRuntime(); try { Process powershell = commandPrompt.exec("powershell -Command \"get-winevent -FilterHashTable @{ logname = 'Microsoft-Windows-PrintService/Operational';StartTime = '"+givenDate+" 12:00:01 AM'; EndTime = '"+beforeDay+" 23:59:59 '; ID = 307 ;} | ConvertTo-csv| Out-file "+ file +"\""); //I have tried waitFor() here but that does not seem to work, required command is executed but is still blocked } catch (IOException e) { } // Remaining code should get executed only after above is completed. 

Answer 1

您需要使用waitFor()而不是wait() 。 这样你的线程就会阻塞，直到执行的命令完成。

Answer 2

我在这里找到答案从Java Synchronously运行shell脚本

 public static void executeScript(String script) { try { ProcessBuilder pb = new ProcessBuilder(script); Process p = pb.start(); // Start the process. p.waitFor(); // Wait for the process to finish. System.out.println("Script executed successfully"); } catch (Exception e) { e.printStackTrace(); } } 

Answer 3

这应该工作。 如果没有，请指定什么不起作用

 Runtime commandPrompt = Runtime.getRuntime(); try { Process powershell = commandPrompt.exec("powershell -Command \"get-winevent -FilterHashTable @{ logname = 'Microsoft-Windows-PrintService/Operational';StartTime = '"+givenDate+" 12:00:01 AM'; EndTime = '"+beforeDay+" 23:59:59 '; ID = 307 ;} | ConvertTo-csv| Out-file "+ file +"\""); powershell.waitFor(); } catch (IOException e) { } // remaining code