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) {// somethingthrow 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-streamprivate 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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