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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;
- }
- }
- /**
- * 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<String, String> textParams = new HashMap<String, String>();
- Map<String, File> fileparams = new HashMap<String, File>();
- 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<String> keySet = textParams.keySet();
- for (Iterator<String> 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<String> keySet = fileparams.keySet();
- for (Iterator<String> 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<ImageReader> 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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