无法通过java将数据写入文件

Question

我正在创建一个文本文件并向其中写入一些数据。我想在文件中写入的字符串 已成功写入，但每当我想在文件中写入新行（使用 \n）时，它会在该 notpad 文件中显示一些框，如 [][]][]。我如何在文本文件中写入新行字符。告诉我我做错了什么。这是我的代码。提前致谢。

      try {
        //FileWriter f = new FileWriter("/sdcard/download/possible.txt");
     FileOutputStream fOut = openFileOutput("report.txt",MODE_WORLD_READABLE);
         OutputStreamWriter osw = new OutputStreamWriter(fOut); 
         osw.write("Diet Report"+"\n");
         osw.append("\nFood Calories Consumed \n");
        osw.append(""+SummaryReportActivity.map.keySet());
    osw.append(""+SummaryReportActivity.map.values());
         osw.append("\n");
     osw.append("\nExercise Calories Burnt \n");
    osw.append(""+SummaryReportActivity.exercisemap.keySet());
    osw.append(""+SummaryReportActivity.exercisemap.values());
             osw.append("\n");
             osw.append("\nWeight Recorded \n");
         osw.append(""+SummaryReportActivity.weightmap.keySet());
                             osw.append(""+SummaryReportActivity.weightmap.values());
         osw.append("\n");
         osw.append("\nNet Calories Daily \n");
                             osw.append(""+SummaryReportActivity.netCalorie.keySet());
                             osw.append(""+SummaryReportActivity.netCalorie.values());
         osw.flush();
         osw.close();
        FileInputStream fIn = openFileInput("report.txt");
           InputStreamReader isr = new InputStreamReader(fIn);
           char[] inputBuffer = new char[100];
             isr.read(inputBuffer);
           readString = new String(inputBuffer);

        } catch (IOException e) {
                // TODO Auto-generated catch block
                    e.printStackTrace();
            }


//code to mail that text file as an attachement 
    Intent i=new Intent(Intent.ACTION_SEND);
                        //i.putExtra(Intent.EXTRA_EMAIL,emailaddress.getText().toString());
        i.putExtra(Intent.EXTRA_SUBJECT, "Summary report of your diet");
        i.putExtra(Intent.EXTRA_STREAM, Uri.parse("report.txt"));
        i.setType("text/plain");
           startActivity(i); 

Answer 1

我认为 System.getProperty("line.separator");是您正在寻找的内容，这将为您正在运行的平台获取适当的换行符。

看看这篇文章 发布。