安卓文件写入与读取

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读写/data/data/<应用程序名>目录上的文件:

//写数据  public void writeFile(String fileName,String writestr) throws IOException{     try{           FileOutputStream fout =openFileOutput(fileName, MODE_PRIVATE);           byte [] bytes = writestr.getBytes();           fout.write(bytes);           fout.close();         }           catch(Exception e){           e.printStackTrace();          }   }   //读数据  public String readFile(String fileName) throws IOException{     String res="";     try{            FileInputStream fin = openFileInput(fileName);            int length = fin.available();            byte [] buffer = new byte[length];            fin.read(buffer);                res = EncodingUtils.getString(buffer, "UTF-8");            fin.close();            }        catch(Exception e){            e.printStackTrace();        }        return res;   }

从resource的asset中读取文件数据

String fileName = "test.txt"; //文件名字   String res="";   try{      //得到资源中的asset数据流     InputStream in = getResources().getAssets().open(fileName);      int length = in.available();              byte [] buffer = new byte[length];             in.read(buffer);                 in.close();     res = EncodingUtils.getString(buffer, "UTF-8");         }catch(Exception e){         e.printStackTrace();              }

从resource的raw中读取文件数据

String res = "";   try{       //得到资源中的Raw数据流      InputStream in = getResources().openRawResource(R.raw.test);       //得到数据的大小      int length = in.available();             byte [] buffer = new byte[length];              //读取数据      in.read(buffer);               //依test.txt的编码类型选择合适的编码，如果不调整会乱码       res = EncodingUtils.getString(buffer, "BIG5");       //关闭          in.close();                 }catch(Exception e){         e.printStackTrace();              }

读写SD卡中的文件。也就是/mnt/sdcard/目录下面的文件

//写数据到SD中的文件  public void writeFileSdcardFile(String fileName,String write_str) throws IOException{    try{          FileOutputStream fout = new FileOutputStream(fileName);          byte [] bytes = write_str.getBytes();          fout.write(bytes);          fout.close();        }        catch(Exception e){           e.printStackTrace();          }      }   //读SD中的文件  public String readFileSdcardFile(String fileName) throws IOException{     String res="";     try{            FileInputStream fin = new FileInputStream(fileName);            int length = fin.available();            byte [] buffer = new byte[length];            fin.read(buffer);                res = EncodingUtils.getString(buffer, "UTF-8");            fin.close();               }           catch(Exception e){            e.printStackTrace();           }           return res;   }

使用File类进行文件的读写

//读文件  public String readSDFile(String fileName) throws IOException {            File file = new File(fileName);            FileInputStream fis = new FileInputStream(file);            int length = fis.available();            byte [] buffer = new byte[length];            fis.read(buffer);                res = EncodingUtils.getString(buffer, "UTF-8");            fis.close();                return res;    }    //写文件  public void writeSDFile(String fileName, String write_str) throws IOException{            File file = new File(fileName);            FileOutputStream fos = new FileOutputStream(file);            byte [] bytes = write_str.getBytes();           fos.write(bytes);           fos.close();        ｝

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