当文件确实存在时,ProcessBuilder给出“找不到文件”异常
正在运行将在Linux Web服务器上运行的应用程序中,以从某个目录中删除日志,但是我一直收到FileNotFound异常。
这是代码:
public static void deleteLOG() { try {
ProcessBuilder probuilder = new ProcessBuilder("find /home/root/multicraft/servers/ -name '*.log' -delete");
probuilder.start();
} catch (IOException e) {
e.printStackTrace();
}
}
而且例外
java.io.IOException: Cannot run program "find . -name '*CoreData*' -delete" (in directory "/home/root/multicraft/servers"): error=2, No such file or directory at java.lang.ProcessBuilder.start(Unknown Source)
at com.mcprohosting.com.nodecleanup.Preprocess.deleteCoreData(Preprocess.java:23)
at com.mcprohosting.com.nodecleanup.handlers.CleanupHandler.executeCleanup(CleanupHandler.java:36)
at com.mcprohosting.com.main.NodeCleaner.init(NodeCleaner.java:29)
at com.mcprohosting.com.main.NodeCleaner.main(NodeCleaner.java:25)
Caused by: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.forkAndExec(Native Method)
at java.lang.UNIXProcess.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 5 more
但是,命令cd / home / root / multicraft / servers可以很好地工作。
我也尝试过:
ProcessBuilder probuilder = new ProcessBuilder("find . -name '*Backup*' -delete"); probuilder.directory(new File("/home/root/multicraft/servers/"));
probuilder.start();
回答:
所述ProcessBuilder
构造函数接收多个串-无论是作为一个List<String>
或作为参数,每一种类型的可变数量String
:
http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/ProcessBuilder.html#ProcessBuilder(java.util.List)
http://docs.oracle.com/javase/1.5。 0 / docs / api / java / lang /
ProcessBuilder.html#ProcessBuilder(java.lang.String
…)
您遇到了麻烦,因为您将整个命令作为一个字符串传递了,导致JVM查找名为“ find /home/root/multicraft/servers/
-name '*.log' -delete”而不是的程序find
。
您必须将长命令分成多个部分。如:
ProcessBuilder pb = new ProcessBuilder("find", ".", "-name", "'*CoreData*"...);
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