用投球尝试/接住

Question

我对投球的尝试/接球感到困惑。函数中有两个可能的IOExceptions。一，我想抓住并继续。另一个我想抛出一个异常让前面的函数处理。

如果IOException无法打开文件，我想捕获它，通知用户，然后继续。如果清除目录时出现IOException,我想抛出一个异常并在调用代码中处理它。

   output = parseCSV(fileList);

private static String parseCSV(List<File> fileList) throws IOException {
    String returnString = "";
    String[] tokens = null;
    String currFileName = "";
    for(File file: fileList){
        currFileName = file.getName();
        try {

            BufferedReader br = new BufferedReader(new FileReader(file));
            String line;

            while ((line = br.readLine()) != null) {
            }
                //do stuff
            }
            br.close();
        } catch (FileNotFoundException e) {
            returnString += "Cannot find " + currfileName + "!\n";
        } catch (IOException e) {
            returnString += "Cannot open " + currFileName + "!\n";
        }
    }
    clearUploads();

    if (returnString.equals("")) {
        returnString = "Files uploaded and saved successfully";
    }
    return returnString;

}

private static void clearUploads() throws IOException {
    FileUtils.cleanDirectory(new File(filePath));
}

Answer 1

try块将捕获其作用域内的任何与catch部分中的类型兼容的内容，因为clearUploads在try块之外，所以它不会被该块捕获。