（原）Eclipse的java中文件读写

1 在<uses-sdk…/>下面添加permission

<uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="16" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

2 在onCreate函数的下面添加如下代码：

     //写SD中的文件
     public void writeFileSdcardFile(String fileName,byte [] bytes) throws IOException
     {
         try
         {
             FileOutputStream fout = new FileOutputStream(fileName);
             fout.write(bytes);
             fout.close();
         }
         catch(Exception e)
         {
             e.printStackTrace();
         }
     }   
 
     //读SD中的文件
     public void readFileSdcardFile(String fileName, byte [] bytes) throws IOException
     {
         try
         {
             FileInputStream fin = new FileInputStream(fileName);
             fin.read(bytes);
             fin.close();
         }
         catch(Exception e)
         {
             e.printStackTrace();
         }
     }

3 调用处：

         byte [] buffer = new byte[width*height];   
 
         try  //读文件
         {
             readFileSdcardFile("/mnt/sdcard/2.raw", buffer);
         }
         catch (IOException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
 
         //your program...
 
         byte[] arraydst2 = new byte [width*height];
         try  //写文件
         {
             writeFileSdcardFile("/mnt/sdcard/2out.raw",arraydst2);
         }
         catch (IOException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

4 主要参考：

http://blog.csdn.net/ztp800201/article/details/7322110