android讀去txt 爲string

直接用字節流讀取，可保留原格式，在拼裝字符串的時候能夠把編碼轉爲utf－8 防止亂碼，可是根據緩存byte數組的大小不一樣，會出現部分字符亂碼狀況

public static String readToText(String filePath) {//按字節流讀取可保留原格式，可是有部分亂碼狀況，根據每次讀取的byte數組大小而變化
        StringBuffer txtContent = new StringBuffer();
        byte[] b = new byte[2048];
        InputStream in = null;
        try {
            in = new FileInputStream(filePath);
            int n;
            while ((n = in.read(b)) != -1) {
                txtContent.append(new String(b, 0, n, "utf-8"));
            }
            in.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return txtContent.toString();
    }

 

使用字符流的readline讀取出來不能保留文檔原格式，裏面的空格換行都失效了。可是沒有亂碼。最終解決辦法，是採用此方法，而後手動拼接換行符。代碼以下：

public static String readtxt(String path) {//按行讀取，不能保留換行等格式，因此須要手動添加每行換行符。
//        String result = "";
        StringBuffer txtContent = new StringBuffer();
        File file = new File(path);
        try {
            int len = 0;
            FileInputStream in = new FileInputStream(file);
            InputStreamReader reader = new InputStreamReader(in, "utf-8");
            BufferedReader br = new BufferedReader(reader);
            String s = null;
            while ((s = br.readLine()) != null) {
                if (len != 0) {// 處理換行符的問題，第一行不換行
                    txtContent.append(new String(("\r\n" + s).getBytes(), "utf-8"));
                } else {
                    txtContent.append(new String(s.getBytes(), "utf-8"));
                }
                len++;
            }
            reader.close();
            in.close();
        } catch (UnsupportedEncodingException | FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    /*try {
        BufferedReader br = new BufferedReader(new FileReader(new File(path)));
        String s = null;
        while((s=br.readLine())!=null){
            result = result + "\n" + s;
        }
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }*/
        return txtContent.toString();
    }