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 [J2SE]执行的Runtime类调用程序停掉的原因
软件技术, 电脑与网络
lhwork 发表于 2006/6/12 14:56:38 |
| 牛牛发现问题的原因，Process process=Runtime.getRuntime().exec("");中产生停滞（阻塞，blocking）。
这个是因为Runtime.getRuntime().exec()要自己去处理stdout和stderr的。 所以如果你想让程序正常运行的话，请务必将上述用别的线程流取走。 >test.bat haha exit 99 >RuntimeTest.java public class RuntimeTest { public static void main(String[] args) { try { Process process=Runtime.getRuntime().exec("test.bat"); StreamGobbler errorGobbler = new StreamGobbler(process.getErrorStream(), "ERROR"); // kick off stderr errorGobbler.start(); StreamGobbler outGobbler = new StreamGobbler(process.getInputStream(), "STDOUT"); // kick off stdout outGobbler.start(); process.waitFor(); System.out.println(process.exitValue()); } catch(Exception e) {} } } >StreamGobbler.java import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; public class StreamGobbler extends Thread { InputStream is; String type; OutputStream os; StreamGobbler(InputStream is, String type) { this(is, type, null); } StreamGobbler(InputStream is, String type, OutputStream redirect) { this.is = is; this.type = type; this.os = redirect; } public void run() { try { PrintWriter pw = null; if (os != null) pw = new PrintWriter(os); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line=null; while ( (line = br.readLine()) != null) { if (pw != null) pw.println(line); System.out.println(type + ">" + line); } if (pw != null) pw.flush(); } catch (IOException ioe) { ioe.printStackTrace(); } } }自己mark一下 |
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