java ADF从txt文件读取数据并分配给变量

Question

我想从文本文件中提取数据并将其分配到变量中，然后才能提交到数据库中。我能够读取文本文件中的所有数据，不幸的是，我无法将它们分开并分配给某个变量。我的代码如下：

private RichInputFile inputFile;
private UploadedFile file;
private String fileContent;
private String fileName;
private InputStream inputstream; 

 public void onFileUploadValueChangeListener(ValueChangeEvent valueChangeEvent) {
    resetValue();
    file = (UploadedFile)valueChangeEvent.getNewValue();
    try {

        inputstream = file.getInputStream();
        System.out.println("inputstream Name: " +inputstream);

    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void onUploadFile(ActionEvent actionEvent) {

    if (file != null && inputstream != null) {

        fileName = file.getFilename();
        System.out.println("Notepad Name: " +fileName);
        StringWriter writer = new StringWriter();

        try {

            IOUtils.copy(inputstream, writer);
            fileContent = writer.toString();
            System.out.println("File Content: " +fileContent);

        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("Notepad Content: " +writer);
    }

    if (inputFile != null) {

        inputFile.resetValue();
        inputFile.setValid(true);

    }
}

public void resetValue() {

    if (fileName != null)
        fileName = null;

    if (fileContent != null)
        fileContent = null;

    if (inputstream != null)
        inputstream = null;
}

public void setInputFile(RichInputFile inputFile) {
    this.inputFile = inputFile;

}

public RichInputFile getInputFile() {
    return inputFile;
}

public void setFile(UploadedFile file) {
    this.file = file;
}

public UploadedFile getFile() {
    return file;
}

public String getFileContent() {
    return fileContent;
}

public String getFileName() {
    return fileName;
}

介意给我一些建议吗

Answer 1

编辑通过分隔符拆分行

我假设您的输入文件在一行中包含每个条目

在这种情况下，用此代码替换onUploadFile

它使用Scanner逐行读取inputstream。每一行都可以随心所欲

public void onUploadFile(ActionEvent actionEvent) {

    if (file != null && inputstream != null) {
        fileName = file.getFilename();
        System.out.println("Notepad Name: " + fileName);

        final Scanner scanner = new Scanner(inputstream);
        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();
            //do somthing with the current line, like store each one in a list
            System.out.println(line);
            String[] lineElements=line.split(" ");
            //16/05/2014 17:19:00 6685 00:00:31
            //in your case lineElements[0] should be a date 
            //lineElements[1] is a timestamp linked to the before date 
            //lineElements[2] is a number (int)
            //lineElements[3] is a timestamp
            //build string from elements [0] and [1] then transform it to a date
            //add logic for adding to database...
        }
    }

    if (inputFile != null) {

        inputFile.resetValue();
        inputFile.setValid(true);

    }
}