aaaaaaaaaaaaaa
bbbbbbb

raw file
ddddddddddd
eeeeeeeeee
ffffffffff

            //读写assets目录下的文件InputStream is = getResources().getAssets().open("test.txt");Reader in = new InputStreamReader(is);BufferedReader bufferedReader = new BufferedReader(in);String line = null;while (null != (line = bufferedReader.readLine()) ){System.out.println("assets file==========" + line);}bufferedReader.close();in.close();is.close();

            //读取raw目录下的文件，raw位于res目录下，需要手工创建is = getResources().openRawResource(R.raw.rawfile);in = new InputStreamReader(is);bufferedReader = new BufferedReader(in);line = null;while (null != (line = bufferedReader.readLine()) ){System.out.println("rawfile==========" + line);}bufferedReader.close();in.close();is.close();

           //读写工程内部文件FileOutputStream fileOutputStream = openFileOutput("projectfile.txt", Context.MODE_PRIVATE);OutputStreamWriter osw = new OutputStreamWriter(fileOutputStream);BufferedWriter bw = new BufferedWriter(osw);bw.write("ooooooooooooooooooo");bw.close();osw.close();fileOutputStream.close();FileInputStream fileInputStream = openFileInput("projectfile.txt");InputStreamReader isr = new InputStreamReader(fileInputStream);char[] input = new char[fileInputStream.available()];isr.read(input);isr.close();fileInputStream.close();String str = new String(input);System.out.println("project file=============" + str);

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

            //读写sdcard，需要在AndroidManifest.xml中添加权限说明//<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>File file = Environment.getExternalStorageDirectory();//获取sdcard路径if(file.exists()){//判断是否存在sdcardSystem.out.println("sdcard file path========" + file.getAbsolutePath());File myfile = new File(file, "myfile_sdcard.txt");myfile.createNewFile();FileOutputStream fos = new FileOutputStream(myfile);fos.write("AAAAAAAAAAa".getBytes());fos.flush();fos.close();}//读取sdcard文件File file1 = new File(file, "myfile_sdcard.txt");InputStream inputStream = new FileInputStream(file1);Reader reader = new InputStreamReader(inputStream);BufferedReader bufferedReader1 = new BufferedReader(reader);String iline = null;while(null != (iline = bufferedReader1.readLine())){System.out.println("from sdcard myfile_sdcard.txt============" + iline);}bufferedReader1.close();reader.close();inputStream.close();

09-13 09:44:57.520    2243-2243/com.example.ibm.dataoperate I/System.out﹕ assets file==========aaaaaaaaaaaaaa
09-13 09:44:57.524    2243-2243/com.example.ibm.dataoperate I/System.out﹕ assets file==========bbbbbbb
09-13 09:44:57.528    2243-2243/com.example.ibm.dataoperate I/System.out﹕ rawfile==========raw file
09-13 09:44:57.528    2243-2243/com.example.ibm.dataoperate I/System.out﹕ rawfile==========ddddddddddd
09-13 09:44:57.532    2243-2243/com.example.ibm.dataoperate I/System.out﹕ rawfile==========eeeeeeeeee
09-13 09:44:57.532    2243-2243/com.example.ibm.dataoperate I/System.out﹕ rawfile==========ffffffffff
09-13 09:44:57.544    2243-2243/com.example.ibm.dataoperate I/System.out﹕ project file=============ooooooooooooooooooo
09-13 09:44:57.552    2243-2243/com.example.ibm.dataoperate I/System.out﹕ sdcard file path========/mnt/sdcard
09-13 09:44:57.556    2243-2243/com.example.ibm.dataoperate I/System.out﹕ from sdcard myfile_sdcard.txt============AAAAAAAAAAa