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java - Solaris 10，java 6，file.exists 无法看到现有文件

转载 作者：太空宇宙 更新时间：2023-11-04 08:25:32 25 4
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我有一个代码，可以将数百万个小文件组合成 tar 存档，因此我决定使用我的 Solaris 计算机的/tmp 文件夹。然后我创建了一个 ramdisk，现在我使用我创建的 ramdisk (/ramdata)，而不是/tmp。这是我为完成任务所做的事情:

首先，我尝试在 ramdisk 中创建 tar 存档，然后移动到目标目录，但是当我这样做时，当文件存在时，java 的 File.exists() 无法返回 true。然后我将目录更改为磁盘上的目录(opt/dist/dist1/cdrepo)以放置我的 tar 文件，并且在那里成功创建了 tar 文件，但当文件存在时，File.exists() 再次无法返回 true。

然后我看到了这篇文章Alternative to File.exists() in Java我相应地更改了代码，以便 NFS 会重置缓存，但它也不起作用。

任何人都可以提出任何解决方案或想法来解释为什么会发生这种情况以及我如何解决这个问题吗？感谢大家。

我正在使用 Java6U21，它是 Solaris 10 机器..

下面是我尝试的最终代码..:我知道该代码有一些来 self 之前尝试的迹象 - 例如我实例化 File 对象并使用 fileExists 变量检查其存在的地方...... - 这肯定不会按预期工作，但因为现在我只是想查看 File.exists() 的真实结果，所以我忽略它们。主要的异常(exception)是 czf.take_md5 方法行，第一行是 FileInputStream fis = new FileInputStream(filename); 

public static synchronized void CreateZipFileFromSingleFolder(String folder,int CDNumber) throws Exception{

    CreateZipFile czf = new CreateZipFile();
        System.err.println(folder + " tarlaniyor...");
        Process p=null;

        String tarName=CDFolderInfo.getID()+"_cd_"+CDNumber + ".tar ";
        String tarFolder=CDFolderInfo.getPathRoot();
        //String komut = "tar -cf " + tarFolder+"/"+tarName+"  "+ folder;
        String komut = "tar -cf " + "/opt/dist/dist1/cdrepo/"+tarName+"  "+ folder;
        try {
            System.err.println(komut + " ----- komutu ile tarlama yapilacak.......");
            p = Runtime.getRuntime().exec(komut);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            p.waitFor();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.err.println("system exit value:  "  + p.exitValue());
        if(p.exitValue()==0)
        {
                Process p3=null;
                p3=Runtime.getRuntime().exec("ls -l /opt/dist/dist1/cdrepo");
                p3.waitFor();
                if(p3.exitValue()==0)
                    System.err.println("LS CDREPO ICIN BASARILI OLARAK CALISTI...");

                /*Process p4=null;
                p4=Runtime.getRuntime().exec("ls -l " +tarFolder+"/"+tarName);
                p4.waitFor();
                if(p4.exitValue()==0)
                    System.err.println("LS TAR FOLDER ICIN BASARILI OLARAK CALISTI...");
                */

                File f2=new File("/opt/dist/dist1/cdrepo/"+tarName);

                System.err.println("Absolute Path : "+f2.getAbsolutePath());
                System.err.println("         Path : "+f2.getPath());
                System.err.println("Canonical Path : "+f2.getCanonicalPath());
                System.err.println("is File : "+f2.isFile());
                System.err.println("Length : "+f2.length());
                System.err.println("is Hidden : "+f2.isHidden());

                if(f2.exists())
                    System.err.println("Dosya cdrepoda...");
                else 
                    System.err.println("dosya derepoda degil...");
                f2=null;

                try {
                    czf.take_md5("/opt/dist/dist1/cdrepo/"+tarName);
                    System.err.println("MD5 alma succeed...");
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }



                /*
                if(f2.exists())
                    System.err.println("Tar tasima succeed..");
                else 
                    System.err.println("move komutu basarili , ama dosyayi bulamiyorum...");
                f2=null;*/



            }else
                System.err.println("p == 0 yanlis... Tar olusturma failed..");


            /*System.err.println("tar file existence will be checked..");*/
            File f=new File(tarFolder+"/"+tarName);
            boolean fileExists = FileUtils.waitFor(f, 10);
            if(fileExists){
                System.err.println("tar succeeded .... " + tarFolder+"/"+tarName);
                System.err.println("tar file existence PASSED ..");
            }else{
                System.err.println("tar process didnt fail, but actually failed...");
            }
            f=null;

        /*  Process p2 = Runtime.getRuntime().exec("mv " + tarFolder+"/"+tarName+"  "+ "cdrepo/"+tarName);
            p2.waitFor();*/

        //if(p2.exitValue()==0){
                //System.err.println("p2 == 0 kontrolu dogru....");
                Process p1=null;
                try {
                    p1 = Runtime.getRuntime().exec("rm -rf " + folder );
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                try {
                    p1.waitFor();
                    if(p1.exitValue()==0)
                        System.err.println("Dizin silme tamamlandı... " + folder);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }       
    //  }
}

输出是:

    /ramdata/cdtemp_125_1 tarlaniyor...
tar -cf /opt/dist/dist1/cdrepo/125_cd_1.tar   /ramdata/cdtemp_125_1 ----- komutu ile tarlama yapilacak.......
system exit value:  0
LS CDREPO ICIN BASARILI OLARAK CALISTI...
Absolute Path : /opt/dist/dist1/cdrepo/125_cd_1.tar 
         Path : /opt/dist/dist1/cdrepo/125_cd_1.tar 
Canonical Path : /opt/dist/dist1/cdrepo/125_cd_1.tar 
is File : false
Length : 0
is Hidden : false
dosya derepoda degil...
java.io.FileNotFoundException: /opt/dist/dist1/cdrepo/125_cd_1.tar  (No such file or directory)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:106)
        at java.io.FileInputStream.<init>(FileInputStream.java:66)
        at staticcdbuildernewver.CreateZipFile.take_md5(CreateZipFile.java:34)
        at staticcdbuildernewver.OracleSideDbOps.CreateZipFileFromSingleFolder(OracleSideDbOps.java:723)

这是 Jayan 建议的 TRUSS 命令的输出:它似乎无法解析路径:(但由于我不太擅长 UNIX linux，所以我不太明白它的含义.. 

/37:    1179.9948       write(2, " L S   C D R E P O   I C".., 41)      = 41
/21:    1179.9948       lwp_cond_wait(0x08234D48, 0x08234D30, 0xB60D6C08, 0) = 0
/21:    1179.9949       mprotect(0xFEC60000, 4096, PROT_READ)           = 0
/37:    1179.9950           Incurred fault #6, FLTBOUNDS  %pc = 0xFE4B49A1
/37:          siginfo: SIGSEGV SEGV_ACCERR addr=0xFEC60280
/37:    1179.9950           Received signal #11, SIGSEGV [caught]
/37:          siginfo: SIGSEGV SEGV_ACCERR addr=0xFEC60280
/21:    1179.9950       mprotect(0xFEC60000, 4096, PROT_READ|PROT_WRITE) = 0
/37:    1179.9950       lwp_sigmask(SIG_SETMASK, 0xFFBFFEFF, 0x0000FFF7) = 0xFFBFFEFF [0x0000FFFF]
/37:    1179.9951       setcontext(0xB5A6C1C0)
/21:    1179.9951       mprotect(0xFEE20000, 4096, PROT_NONE)           = 0
/21:    1179.9957       mprotect(0xFEE20000, 4096, PROT_READ)           = 0
/21:    1179.9958       lwp_cond_signal(0x0849D448)                     = 0
/37:    1179.9958       lwp_cond_wait(0x0849D448, 0x0849D430, 0x00000000, 0) = 0
/21:    1179.9959       lwp_cond_signal(0x084BDC48)                     = 0
/39:    1179.9959       lwp_cond_wait(0x084BDC48, 0x084BDC30, 0x00000000, 0) = 0
/37:    1179.9959       write(2, "\n", 1)                               = 1
/39:    1179.9959       mprotect(0xB5BDC000, 12288, PROT_READ|PROT_WRITE) = 0
/37:    1179.9960       write(2, " / o p t / d i s t / d i".., 15)      = 15
/39:    1179.9960       lwp_sigmask(SIG_SETMASK, 0x00000004, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
/37:    1179.9961       write(2, "\n", 1)                               = 1
/39:    1179.9961       lwp_sigmask(SIG_SETMASK, 0xFFBFFEFF, 0x0000FFF7) = 0xFFBFFEFF [0x0000FFFF]
/37:    1179.9962       write(2, "\n", 1)                               = 1
/39:    1179.9962       lwp_exit()
/37:    1179.9963       write(2, " / o p t / d i s t / d i".., 15)      = 15
/37:    1179.9964       write(2, "\n", 1)                               = 1
/37:    1179.9964       write(2, "\n", 1)                               = 1
/37:    1179.9965       write(2, " A b s o l u t e   P a t".., 52)      = 52
/37:    1179.9966       write(2, "\n", 1)                               = 1
/37:    1179.9967       write(2, "                   P a t".., 52)      = 52
/37:    1179.9967       write(2, "\n", 1)                               = 1
/37:    1179.9968       resolvepath("/opt/dist/dist1/cdrepo/125_cd_1.tar ", 0xB5A6C3C0, 1024) Err#2 ENOENT
/37:    1179.9969       resolvepath("/opt/dist/dist1/cdrepo", "/opt/dist/dist1/cdrepo", 1024) = 22
/37:    1179.9970       write(2, " C a n o n i c a l   P a".., 53)      = 53
/37:    1179.9970       write(2, "\n", 1)                               = 1
/37:    1179.9971       stat64("/opt/dist/dist1/cdrepo/125_cd_1.tar ", 0xB5A6C6C0) Err#2 ENOENT
/37:    1179.9972       write(2, " i s   F i l e   :   f a".., 15)      = 15
/37:    1179.9972       write(2, "\n", 1)                               = 1
/37:    1179.9973       stat64("/opt/dist/dist1/cdrepo/125_cd_1.tar ", 0xB5A6C700) Err#2 ENOENT
/37:    1179.9974       write(2, " L e n g t h   :   0", 10)            = 10
/37:    1179.9975       write(2, "\n", 1)                               = 1
/37:    1179.9975       stat64("/opt/dist/dist1/cdrepo/125_cd_1.tar ", 0xB5A6C6C0) Err#2 ENOENT
/37:    1179.9976       write(2, " i s   H i d d e n   :  ".., 17)      = 17
/37:    1179.9977       write(2, "\n", 1)                               = 1
/37:    1179.9977       write(2, " / o p t / d i s t / d i".., 15)      = 15
/37:    1179.9978       write(2, "\n", 1)                               = 1
/37:    1179.9979       write(2, "\n", 1)                               = 1
/37:    1179.9979       stat64("/opt/dist/dist1/cdrepo/125_cd_1.tar ", 0xB5A6C700) Err#2 ENOENT
/37:    1179.9980       write(2, " d o s y a   d e r e p o".., 23)      = 23
/37:    1179.9980       write(2, "\n", 1)                               = 1
/37:    1179.9981       open64("/opt/dist/dist1/cdrepo/125_cd_1.tar ", O_RDONLY) Err#2 ENOENT
/37:    1179.9983       write(2, " j a v a . i o . F i l e".., 95)      = 95
/37:    1179.9984       write(2, "\n", 1)                               = 1
/37:    1179.9986       write(2, "\t a t   j a v a . i o .".., 47)      = 47
/37:    1179.9986       write(2, "\n", 1)                               = 1
/37:    1179.9987       write(2, "\t a t   j a v a . i o .".., 60)      = 60
/37:    1179.9987       write(2, "\n", 1)                               = 1
/37:    1179.9988       write(2, "\t a t   j a v a . i o .".., 59)      = 59
/37:    1179.9988       write(2, "\n", 1)                               = 1
/37:    1179.9989       write(2, "\t a t   s t a t i c c d".., 71)      = 71
/37:    1179.9990       write(2, "\n", 1)                               = 1
/37:    1179.9990       write(2, "\t a t   s t a t i c c d".., 97)      = 97
/37:    1179.9991       write(2, "\n", 1)                               = 1
/37:    1179.9991       write(2, "\t a t   s t a t i c c d".., 68)      = 68
/37:    1179.9992       write(2, "\n", 1)                               = 1
/37:    1179.9993       write(2, "\t a t   s t a t i c c d".., 87)      = 87
/37:    1179.9993       write(2, "\n", 1)                               = 1
/37:    1179.9994       write(2, "\t a t   s t a t i c c d".., 55)      = 55
/37:    1179.9995       write(2, "\n", 1)                               = 1
/37:    1179.9995       write(2, "\t a t   j a v a . l a n".., 41)      = 41

最佳答案

所有问题都出在 tarName 变量定义中的额外空格..只需删除多余的空格..一切都会正常工作..

关于java - Solaris 10，java 6，file.exists 无法看到现有文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8613705/

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