Java 爪哇语;tasklist.exe/fo csv/nh“;在进程waitFor中加载命令需要花费很长时间
我在main()中通过命令(“tasklist.exe/fo csv/nh”)调用方法命令 这是我的代码片段:Java 爪哇语;tasklist.exe/fo csv/nh“;在进程waitFor中加载命令需要花费很长时间,java,tasklist,Java,Tasklist,我在main()中通过命令(“tasklist.exe/fo csv/nh”)调用方法命令 这是我的代码片段: String command(String command)throws Exception {long start=System.currentTimeMillis(); System.out.println(" Entered command execution starting , executing : "+command);
String command(String command)throws Exception
{long start=System.currentTimeMillis();
System.out.println(" Entered command execution starting , executing : "+command);
String output="";
//A string for accumulating the output given by command executed
System.out.println(" On line 1 ");
Process powerShellProcess = Runtime.getRuntime().exec(command);
System.out.println(" On line 2 ");
//Executing our command by Process
powerShellProcess.waitFor();
System.out.println(" On line 3 ");
//Waiting for it to complete
powerShellProcess.getOutputStream().close();
System.out.println(" On line 4 ");
//Closing Output Stream
String line;
//A string for each line accumulation of standard output in while loop
BufferedReader stdout = new BufferedReader(new InputStreamReader(
powerShellProcess.getInputStream()));
//BufferedReader for getting standard output given by command .
while ((line = stdout.readLine()) != null) {
output+=line+",";
//Adding line by line output to String output
}
stdout.close();
//Closing BufferedReader stdout
BufferedReader stderr = new BufferedReader(new InputStreamReader(
powerShellProcess.getErrorStream()));
//BufferedReader for getting standard error given by command ( if any ).
stderror="";
//A string for each line accumulation of standard error in while loop
while ((line = stderr.readLine()) != null) {
stderror+=line;
//Adding line by line standard error to String stderror
}
stderr.close();
//Closing BufferedReader stderr
long end=System.currentTimeMillis();
System.out.println(" Ending command execution starting in "+(end-start)+" milliseconds . ");
System.out.println(" Error : ");
System.out.println(stderror);
System.out.println(" Output : ");
System.out.println(output);
return output;
//Returning standard output by command
}
它被困在waitFor()中,而且要花很长时间才能加载,我不明白
代码输出如下:
第1行
第2行
我们将非常感谢您的进一步帮助。尝试删除.waitFor(),但我警告您,删除它可能会导致输出不完整/为空,因为它不会等待它返回输出。因此最好考虑等待或进程ISAcviv.()将输出附加到StrugBu建器并随后打印。