来自「用Java实现断点续传」· 代码 · 共 848 行 · 第 1/2 页

HttpURLConnection httpConnection =3D =
(HttpURLConnection)url.openConnection ();
httpConnection.setRequestProperty("User-Agent","NetFox");


int responseCode=3DhttpConnection.getResponseCode();
if(responseCode>=3D400)
{
processErrorCode(responseCode);
return -2; //-2 represent access is error
}


String sHeader;


for(int i=3D1;;i++)
{
//DataInputStream in =3D new =
DataInputStream(httpConnection.getInputStream ());
//Utility.log(in.readLine());
sHeader=3DhttpConnection.getHeaderFieldKey(i);
if(sHeader!=3Dnull)
{
if(sHeader.equals("Content-Length"))
{
nFileLength =3D =
Integer.parseInt(httpConnection.getHeaderField(sHeader));
break;
}
}
else
break;
}
}
catch(IOException e){e.printStackTrace ();}
catch(Exception e){e.printStackTrace ();}


Utility.log(nFileLength);


return nFileLength;
}


//=B1=A3=B4=E6=CF=C2=D4=D8=D0=C5=CF=A2=A3=A8=CE=C4=BC=FE=D6=B8=D5=EB=CE=BB=
=D6=C3=A3=A9
private void write_nPos()
{
try{
output =3D new DataOutputStream(new FileOutputStream(tmpFile));
output.writeInt(nStartPos.length);
for(int i=3D0;i<nStartPos.length;i++)
{
// output.writeLong(nPos[i]);
output.writeLong(fileSplitterFetch[i].nStartPos);
output.writeLong(fileSplitterFetch[i].nEndPos);
}
output.close();
}
catch(IOException e){e.printStackTrace ();}
catch(Exception e){e.printStackTrace ();}
}


//=B6=C1=C8=A1=B1=A3=B4=E6=B5=C4=CF=C2=D4=D8=D0=C5=CF=A2=A3=A8=CE=C4=BC=FE=
=D6=B8=D5=EB=CE=BB=D6=C3=A3=A9
private void read_nPos()
{
try{
DataInputStream input =3D new DataInputStream(new =
FileInputStream(tmpFile));
int nCount =3D input.readInt();
nStartPos =3D new long[nCount];
nEndPos =3D new long[nCount];
for(int i=3D0;i<nStartPos.length;i++)
{
nStartPos[i] =3D input.readLong();
nEndPos[i] =3D input.readLong();
}
input.close();
}
catch(IOException e){e.printStackTrace ();}
catch(Exception e){e.printStackTrace ();}
}


private void processErrorCode(int nErrorCode)
{
System.err.println("Error Code : " + nErrorCode);
}


//=CD=A3=D6=B9=CE=C4=BC=FE=CF=C2=D4=D8
public void siteStop()
{
bStop =3D true;
for(int i=3D0;i<nStartPos.length;i++)
fileSplitterFetch[i].splitterStop();


}
}
/*
**FileSplitterFetch.java
*/
package NetFox;


import java.io.*;
import java.net.*;


public class FileSplitterFetch extends Thread {


String sURL; //File URL
long nStartPos; //File Snippet Start Position
long nEndPos; //File Snippet End Position
int nThreadID; //Thread's ID
boolean bDownOver =3D false; //Downing is over
boolean bStop =3D false; //Stop identical
FileAccessI fileAccessI =3D null; //File Access interface


public FileSplitterFetch(String sURL,String sName,long nStart,long =
nEnd,int id) throws IOException
{
this.sURL =3D sURL;
this.nStartPos =3D nStart;
this.nEndPos =3D nEnd;
nThreadID =3D id;
fileAccessI =3D new FileAccessI(sName,nStartPos);
}


public void run()
{
while(nStartPos < nEndPos && !bStop)
{


try{
URL url =3D new URL(sURL);
HttpURLConnection httpConnection =3D =
(HttpURLConnection)url.openConnection ();
httpConnection.setRequestProperty("User-Agent","NetFox");
String sProperty =3D "bytes=3D"+nStartPos+"-";
httpConnection.setRequestProperty("RANGE",sProperty);
Utility.log(sProperty);


InputStream input =3D httpConnection.getInputStream();
//logResponseHead(httpConnection);


byte[] b =3D new byte[1024];
int nRead;
while((nRead=3Dinput.read(b,0,1024)) > 0 && nStartPos < =
nEndPos && !bStop)
{
nStartPos +=3D fileAccessI.write(b,0,nRead);
//if(nThreadID =3D=3D 1)
// Utility.log("nStartPos =3D " + nStartPos + ", nEndPos =3D " + =
nEndPos);
}


Utility.log("Thread " + nThreadID + " is over!");
bDownOver =3D true;
//nPos =3D fileAccessI.write (b,0,nRead);
}
catch(Exception e){e.printStackTrace ();}
}
}


//=B4=F2=D3=A1=BB=D8=D3=A6=B5=C4=CD=B7=D0=C5=CF=A2
public void logResponseHead(HttpURLConnection con)
{
for(int i=3D1;;i++)
{
String header=3Dcon.getHeaderFieldKey(i);
if(header!=3Dnull)
//responseHeaders.put(header,httpConnection.getHeaderField(header));
Utility.log(header+" : "+con.getHeaderField(header));
else
break;
}
}


public void splitterStop()
{
bStop =3D true;
}


}


/*
**FileAccess.java
*/
package NetFox;
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 =3D new RandomAccessFile(sName,"rw");
this.nPos =3D nPos;
oSavedFile.seek(nPos);
}


public synchronized int write(byte[] b,int nStart,int nLen)
{
int n =3D -1;
try{
oSavedFile.write(b,nStart,nLen);
n =3D nLen;
}
catch(IOException e)
{
e.printStackTrace ();
}


return n;
}


}


/*
**SiteInfoBean.java
*/
package NetFox;


public class SiteInfoBean {


private String sSiteURL; //Site's URL
private String sFilePath; //Saved File's Path
private String sFileName; //Saved File's Name
private int nSplitter; //Count of Splited Downloading File


public SiteInfoBean()
{
//default value of nSplitter is 5
this("","","",5);
}


public SiteInfoBean(String sURL,String sPath,String sName,int nSpiltter)
{
sSiteURL=3D sURL;
sFilePath =3D sPath;
sFileName =3D sName;
this.nSplitter =3D nSpiltter;


}


public String getSSiteURL()
{
return sSiteURL;
}


public void setSSiteURL(String value)
{
sSiteURL =3D value;
}


public String getSFilePath()
{
return sFilePath;
}


public void setSFilePath(String value)
{
sFilePath =3D value;
}


public String getSFileName()
{
return sFileName;
}


public void setSFileName(String value)
{
sFileName =3D value;
}


public int getNSplitter()
{
return nSplitter;
}


public void setNSplitter(int nCount)
{
nSplitter =3D nCount;
}
}


/*
**Utility.java
*/
package NetFox;


public class Utility {


public Utility()
{


}


public static void sleep(int nSecond)
{
try{
Thread.sleep(nSecond);
}
catch(Exception e)
{
e.printStackTrace ();
}
}


public static void log(String sMsg)
{
System.err.println(sMsg);
}


public static void log(int sMsg)
{
System.err.println(sMsg);
}
}


/*
**TestMethod.java
*/
package NetFox;


public class TestMethod {


public TestMethod()
{ ///xx/weblogic60b2_win.exe
try{
SiteInfoBean bean =3D new =
SiteInfoBean("http://localhost/xx/weblogic60b2_win.exe","L:\\temp","weblo=
gic60b2_win.exe",5);
//SiteInfoBean bean =3D new =
SiteInfoBean("http://localhost:8080/down.zip","L:\\temp","weblogic60b2_wi=
n.exe",5);
SiteFileFetch fileFetch =3D new SiteFileFetch(bean);
fileFetch.start();
}
catch(Exception e){e.printStackTrace ();}


}


public static void main(String[] args)
{
new TestMethod();
}
}
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