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Android错误 - 打开失败的ENOENT(Android Error - Open Failed ENOENT)

 我正在尝试使用一个整数数组来保存一些块覆盖，这个数组只需保存执行一个块的次数。 由于某种原因，当我尝试写一些我创建的文件（例如，“BlockForHelper.txt”，我在Eclipse中专门指定并放在项目目录中）时，我收到此错误： 
 

java.io.FileNotFoundException:  /nfs/guille/groce/users/nicholsk/workspace3/SQLTest/BlockForTest: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:416)
at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
at com.example.sql2.SQLTest.blockCoverage(SQLTest.java:149)
at com.example.sql2.test.SQLTestCase.testSuite(SQLTestCase.java:41)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1584)
Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:400)
... 18 more

 

 并给我错误： 
 

public void blockCoverage() throws IOException
{
    String coverage = "";
    for (int x = 0; x < 20; x++)
        coverage += x + " " + bb_count[x] + "\n";

    File file = new File("/nfs/guille/groce/users/nicholsk/workspace3/SQLTest/BlockForTest.txt");
    Writer out = new OutputStreamWriter(new FileOutputStream(file)); // Here
    try
    {
        out.write(coverage);
    } finally {
        out.close();
    }
}

 

 任何人都知道可能是什么原因造成的？ 

I am trying to save some block coverage using an array of integers that simply saves the number of times a block is executed. For some reason, though, when I try and write to some files that I created ("BlockForHelper.txt" for example, which I made specifically in Eclipse and placed in the project directory), I get this error:
 

java.io.FileNotFoundException:  /nfs/guille/groce/users/nicholsk/workspace3/SQLTest/BlockForTest: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:416)
at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
at com.example.sql2.SQLTest.blockCoverage(SQLTest.java:149)
at com.example.sql2.test.SQLTestCase.testSuite(SQLTestCase.java:41)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1584)
Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:400)
... 18 more

 

and gives me the error:
 

public void blockCoverage() throws IOException
{
    String coverage = "";
    for (int x = 0; x < 20; x++)
        coverage += x + " " + bb_count[x] + "\n";

    File file = new File("/nfs/guille/groce/users/nicholsk/workspace3/SQLTest/BlockForTest.txt");
    Writer out = new OutputStreamWriter(new FileOutputStream(file)); // Here
    try
    {
        out.write(coverage);
    } finally {
        out.close();
    }
}

 

Anyone know what might be causing this? 

原文：https://stackoverflow.com/questions/11620641
更新时间：2023-05-17 07:05

最满意答案

 我一直在想最近的事情。 我能想出的最佳方法是在页面上放置几个“区域”。 在我的情况下，这些是3列。 我给每个标识符，并在每次将块移动到不同的位置以更新该块的新位置时使用Ajax调用。 
 

 例如，一个示例数据库表： 
 

tbl.blocks:
  userid | blockid | column | placement
     1   |    2    |   1    |     3

 

 其中，列是简单的列标识符，布局是该列中的布局。 我在页面加载时使用了一个查询，按照展示位置顺序加载这些块，然后将它们blockid指的是一个块表。 
 

 以下是我看到的相关教程： http : //aymanh.com/drag-drop-portal-interface-with-scriptaculous 

I've been thinking about something similar recently. The best method I could come up with was to have several 'zones' on the page where items would be placed. In my case these were 3 columns. I gave each an identifier and used an Ajax call every time a block was moved to a different position to update the new position of that block.
 

For example, a sample database table:
 

tbl.blocks:
  userid | blockid | column | placement
     1   |    2    |   1    |     3

 

Where column is a simple column identifier and placement is the placement within that column. I used a query at page load that loaded the blocks in order of placement, and then wrote them in. blockid refers to a table of blocks.
 

Here's a tutorial I found that looks relevant: http://aymanh.com/drag-drop-portal-interface-with-scriptaculous

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