BufferedReader無法讀取完整的.txt文件

Question

我正在嘗試將中等大小的txt文件（65,00個單詞）讀入字符串，然后是字符串數組。 bufferedreader引發“無法讀取文件”捕獲。 當我清除它時，system.out中將顯示文本文件的一小部分內容。 較小的文本文件沒有出現錯誤。 我是初學者，嘗試縮小問題范圍時遇到很多麻煩。

為什么BufferedReader不提取整個文件？ 為什么會引發“無法讀取文件”錯誤？

public class Main {

public static void main(String[] args) {

    final Guid Main = new Guid();  //creates instance of Guid

    Main.mergeButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) 
        {
        merge();

        }
    });

}
    static void merge()
    {

        //read file and turn into string
        String pathone = open(Guid.PathOne);
        System.out.print(pathone);

        //parse and format 
        //String[] oneArray = pathone.replace("\n"," ").split(" "); 


        //get pathtwo text
        //String pathtwo = open(Guid.PathTwo);

        //parse and format
        //load into array
        //compare array entries
        //add new array entry
        //sort array
        //write array to paththree file


        //for(int i=0; i<oneArray.length;i++)
        //{
            //System.out.println(oneArray[i]);
        //}

    }


    public static String open(JTextArea Path)
    {
        String record = null;

        FileReader frFile = null;
        try {
            frFile = new FileReader(Path.getText());//gets file from Path

            BufferedReader brFile = new BufferedReader(frFile);//creates buffered reader

            record = brFile.readLine() + "\n"; //gets contents of file and puts it into a string
            brFile.mark(0);

            while (brFile.read() != -1) //loop to read the rest of the text file
                {
                    brFile.reset();
                    record = record + brFile.readLine() + "\n";
                    brFile.mark(0);
                }

        } 
        catch (FileNotFoundException e) //catch path is in error
            {
                JFrame frame = null;

                JOptionPane.showMessageDialog(frame, "Could not find file.");
            } 
        catch (IOException e) //catch if file cannot be read
            {
                JFrame frame = null;

                JOptionPane.showMessageDialog(frame, "Could not read file.");
            }

        try {  //closes file
            frFile.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return record;
    }


}

Answer 1

用這種方式做。 如果要讀取整個文件，請刪除reset()和mark()方法。

StringBuilder record = new StringBuilder();
BufferedReader brFile = new BufferedReader(frFile);
String line = null;
while ((line = brFile.readLine()) != null) {
    record.append(line).append("\n");
}

---

注意：

• 不要忘記關閉流。
• 使用finally塊關閉流
• 使用StringBuilder或StringBuffer附加字符串。
• 使用System.getProperty("line.separator")獲取系統特定的行分隔符

看看Java7 try-with-resources語句的優勢

Answer 2

readLine將讀取文檔的第一行。 嘗試一下（未測試）：

String lineReaded;

while ((lineReaded=brFile.readLine())!=null) 
{
record +=linereaded+"\n";
}

尼可

Answer 3

您可能想使用Files.readAllLines