从sd卡上的文件中读取数据

第1种方法：

public static String readFileMsg(String filePath) {if (TextUtils.isEmpty(filePath)) {return "";}BufferedReader reader = null;try {File file = new File(filePath);if (!file.exists()) {return "";}reader = new BufferedReader(new FileReader(file));String line;StringBuilder content = new StringBuilder();while((line = reader.readLine()) != null) {content.append(line);}return content.toString();} catch (Exception e) {e.printStackTrace();} finally {if (reader != null) {try {reader.close();} catch (IOException e) {e.printStackTrace();}}}return "";}

第2种方法：

public static String readFileMsg(String filePath) {
InputStream inStream = null;
BufferedReader reader = null;
try {StringBuilder content = new StringBuilder();File file = new File(filePath);if (!file.exists()) {return "";}inStream = new FileInputStream(file);if (inStream != null) {InputStreamReader inputReader = new InputStreamReader(inStream);reader = new BufferedReader(inputReader);String line;while ((line = reader.readLine()) != null) {content.append(line);}reader.close();return content.toString();}
} catch (Exception e) {e.printStackTrace();
} finally {if(inStream != null) {try {inStream.close();} catch(IOException e) {}}
}
return "";
}