
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。
//文件分割上传
public void cutFileUpload(String fileType,String filePath)
{
try
{
FileAccessI fileAccessI = new FileAccessI(filePath, 0);
Long nStartPos = 0l;
Long length = fileAccessI.getFileLength();
int mBufferSize = 1024 * 100; //每次处理1024 * 100字节
byte[] buffer = new byte[mBufferSize];
FileAccessI.Detail detail;
long nRead = 0l;
String vedioFileName = Usual.f_getUUID(); //分配一个文件名
long nStart = nStartPos;
int i = 0;
while (nStart < length)
{
detail = fileAccessI.getContent(nStart);
nRead = detail.length;
buffer = detail.b;
JSONObject mInDataJson = new JSONObject();
mInDataJson.put("a", "282");
mInDataJson.put("FileName", vedioFileName);
mInDataJson.put("start", nStart); //服务端获取开始文章进行写文件
mInDataJson.put("filetype", fileType);
nStart += nRead;
nStartPos = nStart;
String url = UsualA.f_getXmlSOAUrl(UsualA.mServiceFastByteUrl, "n.uploadvedio", mInDataJson.toString(),
"282");
HttpFastUtil.f_httpPostByte(url, buffer, false);
}
}
catch (Exception e)
{
} - 文件分割类
package ishitong.mppsp.android.util; import java.io.*; public class FileAccessI implements Serializable
{ RandomAccessFile oSavedFile;
long nPos; public FileAccessI() throws IOException
{
this("", 0);
}
public FileAccessI(String sName, long nPos) throws IOException
{
oSavedFile = new RandomAccessFile(sName, "rw");//创建一个随机访问文件类,可读写模式
this.nPos = nPos;
oSavedFile.seek(nPos);
}
public synchronized int write(byte[] b, int nStart, int nLen)
{
int n = -1;
try
{
oSavedFile.write(b, nStart, nLen);
n = nLen;
}
catch (IOException e)
{
e.printStackTrace();
}
return n;
}
//每次读取102400字节
public synchronized Detail getContent(long nStart)
{
Detail detail = new Detail();
detail.b = new byte[102400];
try
{
oSavedFile.seek(nStart);
detail.length = oSavedFile.read(detail.b);
}
catch (IOException e)
{
e.printStackTrace();
}
return detail;
} public class Detail
{ public byte[] b;
public int length;
} //获取文件长度
public long getFileLength()
{
Long length = 0l;
try
{
length = oSavedFile.length();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return length;
}
} - 服务端获得分割的文件,利用RandomAccessFile进行文件整理
/**
* 音视频图片处理
* @param mStr
* @return
* @throws Exception
*/
public static String f_uploadVedio(String mStr) throws Exception
{
String mResult = Usual.mEmpty;
String fileType = Usual.mEmpty;
int startPosL = 0;
RandomAccessFile oSavedFile = null;
JSONObject jsonObject = new JSONObject(mStr);
String vedioJsonStr = jsonObject.getString("VEDIO");
byte[] vedioBytes = Usual.f_fromBase64String(vedioJsonStr);
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)
fileType = (String)jsonObject.getString("filetype");
String fileName = (String)jsonObject.getString("FileName");
if(fileType.equals("picture"))
{
oSavedFile = new RandomAccessFile("E:\\"+fileName+".jpg","rw");
}
else if(fileType.equals("photo"))
{
oSavedFile = new RandomAccessFile("E:\\"+fileName+".jpg","rw");
}
else if(fileType.equals("voice"))
{
oSavedFile = new RandomAccessFile("E:\\"+fileName+".mp3","rw");
}
else if(fileType.equals("video"))
{
oSavedFile = new RandomAccessFile("E:\\"+fileName+".mp4", "rw");
}
//设置标志位,标志文件存储的位置
oSavedFile.seek(startPosL);
oSavedFile.write(vedioBytes);
oSavedFile.close();
mResult = "000";
return mResult;
}