android 大文件分割上传(分块上传)

由于android自身的原因,对大文件(如视频文件)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;
       }

文件转为string字符串参考:

http://blog.csdn.net/jdsjlzx/article/details/51194719


用HttpUrlConnection模拟post表单进行文件上传平时很少使用,比较麻烦。

 

原理是: 分析文件上传的数据格式,然后根据格式构造相应的发送给服务器的字符串。

格式如下:这里的httppost123是我自己构造的字符串,可以是其他任何的字符串

----------httppost123 (\r\n)
Content-Disposition: form-data; name="img"; filename="t.txt" (\r\n)
Content-Type: application/octet-stream (\r\n)

(\r\n)

sdfsdfsdfsdfsdf (\r\n)
----------httppost123 (\r\n)
Content-Disposition: form-data; name="text" (\r\n)

(\r\n)

text tttt (\r\n)
----------httppost123-- (\r\n)
(\r\n)

 

上面的(\r\n)表示各个数据必须以(\r\n)结尾。

 

具体Java代码如下:

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

public class HttpPostUtil {
	URL url;
	HttpURLConnection conn;
	String boundary = "--------httppost123";
	Map textParams = new HashMap();
	Map fileparams = new HashMap();
	DataOutputStream ds;

	public HttpPostUtil(String url) throws Exception {
		this.url = new URL(url);
	}
    //重新设置要请求的服务器地址,即上传文件的地址。
	public void setUrl(String url) throws Exception {
		this.url = new URL(url);
	}
    //增加一个普通字符串数据到form表单数据中
	public void addTextParameter(String name, String value) {
		textParams.put(name, value);
	}
    //增加一个文件到form表单数据中
	public void addFileParameter(String name, File value) {
		fileparams.put(name, value);
	}
    // 清空所有已添加的form表单数据
	public void clearAllParameters() {
		textParams.clear();
		fileparams.clear();
	}
    // 发送数据到服务器,返回一个字节包含服务器的返回结果的数组
	public byte[] send() throws Exception {
		initConnection();
		try {
			conn.connect();
		} catch (SocketTimeoutException e) {
			// something
			throw new RuntimeException();
		}
		ds = new DataOutputStream(conn.getOutputStream());
		writeFileParams();
		writeStringParams();
		paramsEnd();
		InputStream in = conn.getInputStream();
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		int b;
		while ((b = in.read()) != -1) {
			out.write(b);
		}
		conn.disconnect();
		return out.toByteArray();
	}
    //文件上传的connection的一些必须设置
	private void initConnection() throws Exception {
		conn = (HttpURLConnection) this.url.openConnection();
		conn.setDoOutput(true);
		conn.setUseCaches(false);
		conn.setConnectTimeout(10000); //连接超时为10秒
		conn.setRequestMethod("POST");
		conn.setRequestProperty("Content-Type",
				"multipart/form-data; boundary=" + boundary);
	}
    //普通字符串数据
	private void writeStringParams() throws Exception {
		Set keySet = textParams.keySet();
		for (Iterator it = keySet.iterator(); it.hasNext();) {
			String name = it.next();
			String value = textParams.get(name);
			ds.writeBytes("--" + boundary + "\r\n");
			ds.writeBytes("Content-Disposition: form-data; name=\"" + name
					+ "\"\r\n");
			ds.writeBytes("\r\n");
			ds.writeBytes(encode(value) + "\r\n");
		}
	}
    //文件数据
	private void writeFileParams() throws Exception {
		Set keySet = fileparams.keySet();
		for (Iterator it = keySet.iterator(); it.hasNext();) {
			String name = it.next();
			File value = fileparams.get(name);
			ds.writeBytes("--" + boundary + "\r\n");
			ds.writeBytes("Content-Disposition: form-data; name=\"" + name
					+ "\"; filename=\"" + encode(value.getName()) + "\"\r\n");
			ds.writeBytes("Content-Type: " + getContentType(value) + "\r\n");
			ds.writeBytes("\r\n");
			ds.write(getBytes(value));
			ds.writeBytes("\r\n");
		}
	}
    //获取文件的上传类型,图片格式为image/png,image/jpg等。非图片为application/octet-stream
	private String getContentType(File f) throws Exception {
		
//		return "application/octet-stream";  // 此行不再细分是否为图片,全部作为application/octet-stream 类型
		ImageInputStream imagein = ImageIO.createImageInputStream(f);
		if (imagein == null) {
			return "application/octet-stream";
		}
		Iterator it = ImageIO.getImageReaders(imagein);
		if (!it.hasNext()) {
			imagein.close();
			return "application/octet-stream";
		}
		imagein.close();
		return "image/" + it.next().getFormatName().toLowerCase();//将FormatName返回的值转换成小写,默认为大写

	}
    //把文件转换成字节数组
	private byte[] getBytes(File f) throws Exception {
		FileInputStream in = new FileInputStream(f);
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		byte[] b = new byte[1024];
		int n;
		while ((n = in.read(b)) != -1) {
			out.write(b, 0, n);
		}
		in.close();
		return out.toByteArray();
	}
	//添加结尾数据
	private void paramsEnd() throws Exception {
		ds.writeBytes("--" + boundary + "--" + "\r\n");
		ds.writeBytes("\r\n");
	}
	// 对包含中文的字符串进行转码,此为UTF-8。服务器那边要进行一次解码
    private String encode(String value) throws Exception{
    	return URLEncoder.encode(value, "UTF-8");
    }
	public static void main(String[] args) throws Exception {
		HttpPostUtil u = new HttpPostUtil("http://localhost:3000/up_load");
		u.addFileParameter("img", new File(
				"D:\\素材\\圆月.jpg"));
		u.addTextParameter("text", "中文");
		byte[] b = u.send();
		String result = new String(b);
		System.out.println(result);

	}

}

如果不把中文转成UTF-8的格式进行传输,则后台显示中文乱码。

同样,如果其他参数包含中文,则也应当先转码。

当然,具体什么编码要和后台接收的编码一致。


简单的demo:https://github.com/jdsjlzx/uploadFile


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