Question

我正在创建一个复制现有路径的方法'newOutputPath（）'，但它会更改提供的路径中的名称。例如，如果我有一个路径c：/../ parentDir / img.ext，此方法复制相同的路径，但将文件的名称更改为： C：/../ parentDir / AutoGen_img.ext

但是当我打电话时

    System.out.println(FilePathUtils.newOutputPath());

它返回'请注意\ character：

    C:/private/ArbeitsOrdner_19_Mar_2015/Images/FeaturesDetection/samples_00\AutoGenPath_queryjpg

正如你在我使用File.separator的代码中看到的，为什么它会导致这个错误的分隔符'\'我期待'/'呢？

码：

        // i always add the first object but it's not must, we can choose any valid index or choose any valid index randomly.
                                    FilePathUtils.outputFilePathToParentDirList.add(FilePathUtils.getInputFilePathToParentDirList().get(0));
                                    Log.D(TAG, "newOutputPath", FilePathUtils.outputFilePathToParentDirList.get(0));

                                    FilePathUtils.outputFilePathExtList.add(FilePathUtils.getInputFilePathExtList().get(0));
                                    Log.D(TAG, "newOutputPath", FilePathUtils.outputFilePathExtList.get(0)); // prints C:/private/ArbeitsOrdner_19_Mar_2015/Images/FeaturesDetection/samples_00

                                    FilePathUtils.outputImageNameList.add(SystemConstants.AUTO_GEN_PREFIX + FilePathUtils.getInputImageNameList().get(0));
                                    Log.D(TAG, "newOutputPath", FilePathUtils.outputImageNameList.get(0)); //prints jpg

                                    FilePathUtils.outputFileFullPathList.add(FilePathUtils.outputFilePathToParentDirList.get(0) + File.separator + 
                                    FilePathUtils.outputImageNameList.get(0) + FilePathUtils.outputFilePathExtList.get(0)); // prints AutoGenPath_query

                                    if (FilePathUtils.getOutpathFileFullPathListSize() != -1) {
                                        if (FilePathUtils.getOutpathFileFullPathListSize() == 0) 
                                            return FilePathUtils.outputFileFullPathList.get(0);
                                            return FilePathUtils.outputFileFullPathList.get(FilePathUtils.getOutpathFileFullPathListSize() -1 );

                                    } else {
                                        Log.WTF(TAG, "newOutputPath", "outputFileFullPathList is null 'un-initialised at this far of the checking'");
                                        return null;
                                    }


        /**
        * This method is to return the size of the outputFileFullPathList list.
        * @return
        * the size of the outputFileFullPathList, or -1 if the outputFileFullPathList list is null "un-initialised" or 0 if it is empty.
        */
        public static int getOutpathFileFullPathListSize() {
            if (FilePathUtils.outputFileFullPathList != null) {

            if (!FilePathUtils.outputFileFullPathList.isEmpty()) {
                return FilePathUtils.outputFileFullPathList.size();
            } else {
                Log.D(TAG, "getOutpathFileFullPathListSize", "outputFileFullPathList list is empty");
                return 0;
        }

        } else {
            Log.E(TAG, "getOutpathFileFullPathListSize", "outputFileFullPathList list is null because it was not initilised, call StorePath method first to initlise it.");
            return -1;
        }
    }

输出：

Debug: FilePathUtils -> newOutputPath: C:/private/ArbeitsOrdner_19_Mar_2015/Images/FeaturesDetection/samples_00
Debug: FilePathUtils -> newOutputPath: jpg
Debug: FilePathUtils -> newOutputPath: AutoGenPath_query

Answer 1

因为Windows 上的文件分隔符是 \而不是/。 Windows在许多情况下都会接受，但官方的分隔符是反斜杠，因此Windows上的Java用于File.separator。

文件分隔符常量显示假分隔符？

1 个答案: