java代码实现，上传下载MP3 以及MP4 是怎么是现实的呢？ Java文件下载怎么实现的
\u7528java\u5b9e\u73b0\u6587\u4ef6\u7684\u4e0a\u4f20\u4e0e\u4e0b\u8f7d1.\u4e0b\u8f7d\u7b80\u5355\uff0c\u65e0\u975e\u662f\u628a\u670d\u52a1\u5668\u4e0a\u7684\u6587\u4ef6\u6216\u8005\u6570\u636e\u5e93\u4e2d\u7684BLob(\u6216\u5176\u4ed6\u4e8c\u8fdb\u5236\u578b)\uff0c\u7528\u6d41\u8bfb\u51fa\u6765\uff0c\u7136\u540e\u5199\u5230\u5ba2\u6237\u7aef\u5373\u53ef\uff0c\u8981\u6ce8\u610f ContentType\u3002
2.\u4e0a\u4f20\uff0c\u53ef\u4ee5\u7528Apache Commons Upload\u7b49\u5f00\u6e90\u5de5\u5177\uff0c\u6216\u8005\u81ea\u5df1\u5199\uff1a
form\u8981\u7528enctype="multipart/form-data"
\u7136\u540e\u670d\u52a1\u5668\u7aef\u4e5f\u662f\u7528IO\u628a\u5ba2\u6237\u7aef\u63d0\u4ea4\u7684\u6587\u4ef6\u6d41\u8bfb\u5165\uff0c\u7136\u540e\u5199\u5230\u670d\u52a1\u5668\u7684\u6587\u4ef6\u7cfb\u7edf\u6216\u8005\u6570\u636e\u5e93\u91cc\u3002\u4e0d\u540c\u7684\u6570\u636e\u5e93\u5bf9Lob\u5b57\u6bb5\u64cd\u4f5c\u53ef\u80fd\u6709\u6240\u4e0d\u540c\uff0c\u5efa\u8bae\u7528Hibernate,JPA\u7b49\u6210\u719f\u7684ORM\u6846\u67b6\uff0c\u53ef\u4ee5\u4e0d\u8003\u8651\u6570\u636e\u5e93\u7ec6\u8282\u3002
\u4e0b\u8f7d\u5c31\u5f88\u7b80\u5355\u4e86
\u628a\u4f60\u8981\u4e0b\u8f7d\u7684\u6587\u4ef6\u505a\u6210\u8d85\u7ea7\u94fe\u63a5\uff0c\u53ef\u4ee5\u4e0d\u7528\u4efb\u4f55\u7ec4\u4ef6
\u6bd4\u5982\u8bf4
\u4e0b\u8f7d\u4e00\u4e2aword\u6587\u6863
\u540d\u79f0.doc
\u8def\u5f84\u4f60\u81ea\u5df1\u5199
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.URI;
import java.net.URL;
import java.util.Random;
/**
*
* \u5b9e\u73b0\u4e86\u4e0b\u8f7d\u7684\u529f\u80fd*/
public class SimpleTh {
public static void main(String[] args){
// TODO Auto-generated method stub
//String path = "http://www.7cd.cn/QingTengPics/\u5029\u5973\u5e7d\u9b42.mp3";//MP3\u4e0b\u8f7d\u7684\u5730\u5740
String path ="http://img.99luna.com/music/%CF%EB%C4%E3%BE%CD%D0%B4%D0%C5.mp3";
try {
new SimpleTh().download(path, 3); //\u5bf9\u8c61\u8c03\u7528\u4e0b\u8f7d\u7684\u65b9\u6cd5
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String getFilename(String path){//\u83b7\u5f97\u6587\u4ef6\u7684\u540d\u5b57
return path.substring(path.lastIndexOf('/')+1);
}
public void download(String path,int threadsize) throws Exception//\u4e0b\u8f7d\u7684\u65b9\u6cd5
{//\u53c2\u6570 \u4e0b\u8f7d\u5730\u5740\uff0c\u7ebf\u7a0b\u6570\u91cf
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();//\u83b7\u53d6HttpURLConnection\u5bf9\u8c61
conn.setRequestMethod("GET");//\u8bbe\u7f6e\u8bf7\u6c42\u683c\u5f0f\uff0c\u8fd9\u91cc\u662fGET\u683c\u5f0f
conn.setReadTimeout(5*1000);//
int filelength = conn.getContentLength();//\u83b7\u53d6\u8981\u4e0b\u8f7d\u6587\u4ef6\u7684\u957f\u5ea6
String filename = getFilename(path);
File saveFile = new File(filename);
RandomAccessFile accessFile = new RandomAccessFile(saveFile, "rwd");
accessFile.setLength(filelength);
accessFile.close();
int block = filelength%threadsize ==0?filelength/threadsize:filelength/threadsize+1;
for(int threadid = 0;threadid<=threadsize;threadid++){
new DownloadThread(url,saveFile,block,threadid).start();
}
}
private final class DownloadThread extends Thread{
private URL url;
private File saveFile;
private int block;//\u6bcf\u6761\u7ebf\u7a0b\u4e0b\u8f7d\u7684\u957f\u5ea6
private int threadid;//\u7ebf\u7a0bid
public DownloadThread(URL url,File saveFile,int block,int threadid){
this.url = url;
this.saveFile= saveFile;
this.block = block;
this.threadid = threadid;
}
@Override
public void run() {
//\u8ba1\u7b97\u5f00\u59cb\u4f4d\u7f6e\u7684\u516c\u5f0f\uff1a\u7ebf\u7a0bid*\u6bcf\u6761\u7ebf\u7a0b\u4e0b\u8f7d\u7684\u6570\u636e\u957f\u5ea6=\uff1f
//\u8ba1\u7b97\u7ed3\u675f\u4f4d\u7f6e\u7684\u516c\u5f0f\uff1a\uff08\u7ebf\u7a0bid+1\uff09*\u6bcf\u6761\u7ebf\u7a0b\u4e0b\u8f7d\u6570\u636e\u957f\u5ea6-1=\uff1f
int startposition = threadid*block;
int endposition = (threadid+1)*block-1;
try {
try {
RandomAccessFile accessFile = new RandomAccessFile(saveFile, "rwd");
accessFile.seek(startposition);//\u8bbe\u7f6e\u4ece\u4ec0\u4e48\u4f4d\u7f6e\u5199\u5165\u6570\u636e
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(5*1000);
conn.setRequestProperty("Range","bytes= "+startposition+"-"+endposition);
InputStream inStream = conn.getInputStream();
byte[]buffer = new byte[1024];
int len = 0;
while((len = inStream.read(buffer))!=-1){
accessFile.write(buffer, 0, len);
}
inStream.close();
accessFile.close();
System.out.println("\u7ebf\u7a0bid\uff1a"+threadid+"\u4e0b\u8f7d\u5b8c\u6210");
} catch (FileNotFoundException e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
将文件读成二进制流传送到服务器
IO流,file对象
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