Question

使用将在Linux Web服务器上运行的应用程序来删除某个目录中的日志，但是我不断收到FileNotFound异常。

以下是代码：

public static void deleteLOG() {
    try {
        ProcessBuilder probuilder = new ProcessBuilder("find /home/root/multicraft/servers/ -name '*.log' -delete");
        probuilder.start();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

异常

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

然而，cd / home / root / multicraft / servers命令完全正常。

我也试过了：

    ProcessBuilder probuilder = new ProcessBuilder("find . -name '*Backup*' -delete");
    probuilder.directory(new File("/home/root/multicraft/servers/"));
    probuilder.start();

Answer 1

ProcessBuilder构造函数接收多个字符串 - 作为List<String>或可变数量的参数，每个类型都为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...)

您遇到了困难，因为您将整个命令作为一个字符串传递，导致JVM查找名为＆＃34; find /home/root/multicraft/servers/ -name '*.log' -delete＆＃34;而不是find的程序。

您必须将长命令分成几部分。如：

ProcessBuilder pb = new ProcessBuilder("find", ".", "-name", "'*CoreData*"...);

Answer 2

    try {
        ProcessBuilder probuilder = new ProcessBuilder("<Absolute Path To>/find /home/root/multicraft/servers/ -name '*.log' -delete");
        probuilder.start();
    } catch (IOException e) {
        e.printStackTrace();
    }

理想情况下，

<Absolute Path To>应为/ bin或/ usr / bin

ProcessBuilder probuilder = new ProcessBuilder("find /home/root/multicraft/servers/ -name '*Backup*' -delete");
probuilder.directory(new File("<Absolute Path To>"));
probuilder.start();

probuilder.directory期望工作目录find。

当文件存在时，ProcessBuilder会发出“找不到文件”异常

2 个答案: