static String getTime(String command) throws IOException, Throwable{
try{
String completeComm=Userdir+"\\timer.bat";
Process p=Runtime.getRuntime().exec("cmd /c "+completeComm+" "+command+" --batch");
BufferedReader reader=new BufferedReader (new InputStreamReader(p.getInputStream()));
LineIterator l=IOUtils.lineIterator(reader);
try {
while (l.hasNext()) {
String line = l.nextLine();
System.out.println(line);
...
}
}
} finally {
LineIterator.closeQuietly(l);
}
BufferedReader Ereader=new BufferedReader (new InputStreamReader(p.getErrorStream()));
LineIterator El=IOUtils.lineIterator(Ereader);
try {
while (El.hasNext()) {
String line = El.nextLine();
System.out.println(line);
...
}
}
} finally {
LineIterator.closeQuietly(El);
}
}catch(Exception e){
JOptionPane.showMessageDialog(null, e.getMessage());
System.exit(0);
}
}
我的问题是“p.getStreamError”。只有当我的批处理文件的输出/结果不是数百或数千行时,我才能看到p.getStreamError的ouptut,否则我没有得到任何输出(p.getSTreamError)。
为什么当我的批次的返回结果/数据很大时,我无法从p.getStreamError获取任何输出?
当我创建一个jar并运行它时,程序会永远挂起。我调试了它,发现它被卡在“while(El.hasNext())”。为什么程序在通过jar运行时挂起并且与eclipse一起正常工作?
谢谢!
答案 0 :(得分:1)
您需要为while循环使用单独的线程。
考虑创建一个实现Runnable的StreamGobbler类,它在其构造函数中使用InputStream,并在其run方法中使用while循环。然后使用这些Gobblers创建线程并让它们继续。
类似的东西:
public class StreamGobbler implements Runnable {
private static String userdir;
private String name;
private LineIterator lineIterator;
public StreamGobbler(String name, InputStream inStream) {
this.name = name;
BufferedReader bufReader = new BufferedReader(new InputStreamReader(
inStream));
lineIterator = IOUtils.lineIterator(bufReader);
}
@Override
public void run() {
try {
while (lineIterator.hasNext()) {
String line = lineIterator.nextLine();
System.out.println(line);
// ...
}
} finally {
LineIterator.closeQuietly(lineIterator);
}
}
public String getName() {
return name;
}
}
然后可以这样使用:
String completeComm = userdir + "\\timer.bat";
Process p = Runtime.getRuntime().exec(
"cmd /c " + completeComm + " " + command + " --batch");
new Thread(new StreamGobbler("InputStream", p.getInputStream())).start();
new Thread(new StreamGobbler("ErrorStream", p.getErrorStream())).start();