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YuriiS
Asked:2020-11-09 05:05:24 +0000 UTC2020-11-09 05:05:24 +0000 UTC

如何从控制台将数据写入文件

  • 772

我需要创建一个方法，将用户从控制台输入的所有内容写入给定路径的文件，而不覆盖文件的内容。写入文件必须在单独一行输入 wr 命令后完成。我做了这个方法，但由于它的工作，第一个导管立即起作用。调试程序时显示-该进程无法访问该文件，因为该文件已被另一个进程占用。

public static void writeToFileFromConsole(String path){

        InputStreamReader reader = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(reader);

        FileWriter writer = null;
        BufferedWriter bufferedWriter = null;

        System.out.println("Enter file content to write in the file:");

        try {
            String command = "wr";
            String line;
            line = br.readLine();
            if ((line = br.readLine()).equals(command)) {
                writer = new FileWriter(path, true);
                bufferedWriter = new BufferedWriter(writer);

                bufferedWriter.append("\n");
                bufferedWriter.append(line);
            }
        }catch (IOException e){
            System.err.println("Can't write to file with path " + path);
        }
        finally {
            try {
                reader.close();
                br.close();
                if (writer != null){
                    writer.close();
                }
                if (bufferedWriter != null){
                    bufferedWriter.close();
                }
            }catch (IOException e){
                System.err.println("File with path " + path + " not found" );
            }
        }
    }

告诉我我的错误是什么？以及如何修复它，以便将控制台中输入的数据写入文件。

java

1 个回答

  1. Best Answer

    我检查了你的代码，没有错误，除了文件不存在的异常。

    改变它，所以它不会发生：

    private static void writeToFileFromConsole(String path) {
    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

    System.out.println("Enter file content to write in the file:");

    try (OutputStream output = Files
            .newOutputStream(
                    Paths.get(path),
                    StandardOpenOption.APPEND,
                    StandardOpenOption.CREATE);
         BufferedOutputStream outputStream = new BufferedOutputStream(output)) {

        String line;
        while (!"rw".equalsIgnoreCase(line = reader.readLine())) {
            outputStream.write(System.lineSeparator().getBytes());
            outputStream.write(line.getBytes());
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}
    • 2

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