区分大小写的文件扩展名和存在检查

这样，我解决了问题：

public String getActualFilePath() {    File givenFile = new File(filePath);    File directory = givenFile.getParentFile();    if(directory == null || !directory.isDirectory()) {        return filePath;    }    File[] files = directory.listFiles();    Map<String, String> fileMap = new HashMap<String, String>();    for(File file : files) {          if(file.isDirectory()){ continue;        }        String absolutePath = file.getAbsolutePath();        fileMap.put(absolutePath, StringUtils.upperCase(absolutePath));    }    int noOfOcc = 0;    String actualFilePath = "";    for(Entry<String, String> entry : fileMap.entrySet()) {        if(filePath.toUpperCase().equals(entry.getValue())) { actualFilePath = entry.getKey(); noOfOcc++;        }    }    if(noOfOcc == 1) {        return actualFilePath;    }    return filePath;}

这

filePath