文件存储

文件存储

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1.将数据存储到文件中

public void saveDataToFile(String data) {
    FileOutputStream out = null;
    BufferedWriter writer = null;
    try {
        out = openFileOutout("data", MODE_PRIVATE);
        writer = new BufferedWriter(new OutputStreamWriter(out));
        writer.write(data);
    } catch (IOException e) {
        e.printStackTrace():
    } finally {
        try {
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2.从文件中读取数据

public String readDataFromFile() {
    FileInputStream in = null;
    BufferedReader reader = null;
    StringBuilder str = new StringBuilder();
    try {
        in = openFileInput("data");
        String s;
        reader = new BufferedReader(new InputStreamReader(in));
        while((s == reader.readLine()) != null) {
            str.append(s);
        }
    } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return str.toString();
}