JAVA调用一个bat批处理程序,调用几十次后会莫名的不再执行,无任何异常抛出。千试万试,LOG精细到逐行,只知道走到Runtime.getRuntime().exec()程序就停止了,但打死不知道为什么。那真以为里面有鬼。后来寻摸着Runtime.getRuntime().exec()有问题,真给我找到答案了。
大概原因是,调用Runtime.getRuntime().exec()后,如果不及时捕捉进程的输出,会导致JAVA挂住,看似被调用进程没退出。所以,解决办法是,启动进程后,再启动两个JAVA线程及时的把被调用进程的输出截获。
一下子,整个世界清爽多了。。。
原先程序只有一句:Runtime.getRuntime().exec(strMakePathPath);
后来程序更改为:
Process proc = Runtime.getRuntime().exec(strMakePathPath);
StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "Error");
StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "Output");
errorGobbler.start();
outputGobbler.start();
proc.waitFor();
public class StreamGobbler extends Thread {InputStream is;String type;public StreamGobbler(InputStream is, String type) {this.is = is;this.type = type;}public void run() {try {InputStreamReader isr = new InputStreamReader(is);BufferedReader br = new BufferedReader(isr);String line = null;while ((line = br.readLine()) != null) {if (type.equals("Error")) {System.out.println("Error :" + line);} else {System.out.println("Debug:" + line);}}} catch (IOException ioe) {ioe.printStackTrace();}}
}