Question

我试图将一个中等大小的txt文件（65,00个单词）读入一个String，然后是一个字符串数组。 bufferedreader抛出＆＃34;无法读取文件＆＃34;抓住。当我清除它时，文本文件的一小部分内容显示在system.out中。我没有得到较小的文本文件的错误。我是初学者，在尝试缩小问题时遇到了很多麻烦。

为什么BufferedReader没有摄取整个文件？为什么＆＃34;无法读取文件＆＃34;错误被抛出？

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

这样做。如果要阅读整个文件，请删除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：

别忘了关闭小溪。
使用finally块关闭流
使用StringBuilder或StringBuffer追加字符串。
使用System.getProperty("line.separator")获取系统特定的行分隔符

查看Java7 try-with-resources Statement advantage

Answer 2

readLine将读取文档的第一行。尝试使用它（未经测试）：

String lineReaded;

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

尼科

Answer 3

您可能希望使用Files.readAllLines

BufferedReader没有读取完整的.txt文件

3 个答案:

注意：