android下大文件分割上传

1. 由于android自身的原因，对大文件(如影视频文件)的操作很容易造成OOM，即：Dalvik堆内存溢出，利用文件分割将大文件分割为小文件可以解决问题。

• 文件分割后分多次请求服务。
  

   1 //文件分割上传
   2     public  void cutFileUpload(String fileType,String filePath)
   3     {
   4         try
   5         {
   6             FileAccessI fileAccessI = new FileAccessI(filePath, 0);
   7             Long nStartPos = 0l;
   8             Long length = fileAccessI.getFileLength();
   9             int mBufferSize = 1024 * 100; //每次处理1024 * 100字节
  10             byte[] buffer = new byte[mBufferSize];
  11             FileAccessI.Detail detail;
  12             long nRead = 0l;
  13             String vedioFileName = Usual.f_getUUID(); //分配一个文件名
  14             long nStart = nStartPos;
  15             int i = 0;
  16             while (nStart < length)
  17             {
  18                 detail = fileAccessI.getContent(nStart);
  19                 nRead = detail.length;
  20                 buffer = detail.b;
  21                 JSONObject mInDataJson = new JSONObject();
  22                 mInDataJson.put("a", "282");
  23                 mInDataJson.put("FileName", vedioFileName);
  24                 mInDataJson.put("start", nStart); //服务端获取开始文章进行写文件
  25                 mInDataJson.put("filetype", fileType);
  26                 nStart += nRead;
  27                 nStartPos = nStart;
  28                 String url = UsualA.f_getXmlSOAUrl(UsualA.mServiceFastByteUrl, "n.uploadvedio", mInDataJson.toString(),
  29                         "282");
  30                 HttpFastUtil.f_httpPostByte(url, buffer, false);
  31             }
  32         }
  33         catch (Exception e)
  34         {
  35         }

  

   

• 文件分割类
  

   1 package ishitong.mppsp.android.util;
   2 
   3 import java.io.*;
   4 
   5 public class FileAccessI implements Serializable
   6 {
   7 
   8     RandomAccessFile oSavedFile;
   9     long nPos;
  10 
  11 
  12     public FileAccessI() throws IOException
  13     {
  14         this("", 0);
  15     }
  16     public FileAccessI(String sName, long nPos) throws IOException
  17     {
  18         oSavedFile = new RandomAccessFile(sName, "rw");//创建一个随机访问文件类，可读写模式
  19         this.nPos = nPos;
  20         oSavedFile.seek(nPos);
  21     }
  22     public synchronized int write(byte[] b, int nStart, int nLen)
  23     {
  24         int n = -1;
  25         try
  26         {
  27             oSavedFile.write(b, nStart, nLen);
  28             n = nLen;
  29         }
  30         catch (IOException e)
  31         {
  32             e.printStackTrace();
  33         }
  34         return n;
  35     }
  36     //每次读取102400字节
  37     public synchronized Detail getContent(long nStart)
  38     {
  39         Detail detail = new Detail();
  40         detail.b = new byte[102400];
  41         try
  42         {
  43             oSavedFile.seek(nStart);
  44             detail.length = oSavedFile.read(detail.b);
  45         }
  46         catch (IOException e)
  47         {
  48             e.printStackTrace();
  49         }
  50         return detail;
  51     }
  52 
  53 
  54     public class Detail
  55     {
  56 
  57         public byte[] b;
  58         public int length;
  59     }
  60 
  61     //获取文件长度
  62     public long getFileLength()
  63     {
  64         Long length = 0l;
  65         try
  66         {
  67             length = oSavedFile.length();
  68         }
  69         catch (IOException e)
  70         {
  71             // TODO Auto-generated catch block
  72             e.printStackTrace();
  73         }
  74         return length;
  75     }
  76 }

  
• 服务端获得分割的文件，利用RandomAccessFile进行文件整理
  

   1 /**
   2      * 音视频图片处理
   3      * @param mStr
   4      * @return
   5      * @throws Exception
   6      */
   7     public static String f_uploadVedio(String mStr) throws Exception
   8     {
   9         String mResult = Usual.mEmpty;
  10         String fileType = Usual.mEmpty;
  11         int startPosL = 0;
  12         RandomAccessFile oSavedFile = null;
  13         JSONObject jsonObject = new JSONObject(mStr);
  14         String vedioJsonStr = jsonObject.getString("VEDIO");
  15         byte[] vedioBytes = Usual.f_fromBase64String(vedioJsonStr);
  16         startPosL = (Integer) jsonObject.get("start"); //接收客户端的开始位置(文件读取到的字节大小)
  17         fileType = (String)jsonObject.getString("filetype");
  18         String fileName = (String)jsonObject.getString("FileName");
  19         if(fileType.equals("picture"))
  20         {
  21             oSavedFile = new RandomAccessFile("E:\\"+fileName+".jpg","rw");
  22         }
  23         else if(fileType.equals("photo"))
  24         {
  25             oSavedFile = new RandomAccessFile("E:\\"+fileName+".jpg","rw");
  26         }
  27         else if(fileType.equals("voice"))
  28          {
  29             oSavedFile = new RandomAccessFile("E:\\"+fileName+".mp3","rw");
  30         }
  31         else if(fileType.equals("video")) 
  32         {
  33             oSavedFile = new RandomAccessFile("E:\\"+fileName+".mp4", "rw");
  34         }
  35         //设置标志位,标志文件存储的位置
  36         oSavedFile.seek(startPosL);
  37         oSavedFile.write(vedioBytes);
  38         oSavedFile.close();
  39         mResult = "000";
  40         return mResult;
  41     }

  

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