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 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