怎样在JAVA中实现断点继传的功能,有没有人知道? Http可以用Range: bytes=xxx-xxx的请求头Ftp可以用...忘记了具体你可以看看蚂蚁发送的命令 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 以前 CSDN 讨论过的:(一)断点续传的原理其实断点续传的原理很简单,就是在Http的请求上和一般的下载有所不同而已。打个比方,浏览器请求服务器上的一个文时,所发出的请求如下:假设服务器域名为wwww.sjtu.edu.cn,文件名为down.zip。GET /down.zip HTTP/1.1Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/msword, application/vnd.ms-powerpoint, */*Accept-Language: zh-cnAccept-Encoding: gzip, deflateUser-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)Connection: Keep-Alive服务器收到请求后,按要求寻找请求的文件,提取文件的信息,然后返回给浏览器,返回信息如下:200Content-Length=106786028Accept-Ranges=bytesDate=Mon, 30 Apr 2001 12:56:11 GMTETag=W/"02ca57e173c11:95b"Content-Type=application/octet-streamServer=Microsoft-IIS/5.0Last-Modified=Mon, 30 Apr 2001 12:56:11 GMT 所谓断点续传,也就是要从文件已经下载的地方开始继续下载。所以在客户端浏览器传给Web服务器的时候要多加一条信息--从哪里开始。下面是用自己编的一个"浏览器"来传递请求信息给Web服务器,要求从2000070字节开始。GET /down.zip HTTP/1.0User-Agent: NetFoxRANGE: bytes=2000070-Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2仔细看一下就会发现多了一行RANGE: bytes=2000070-这一行的意思就是告诉服务器down.zip这个文件从2000070字节开始传,前面的字节不用传了。服务器收到这个请求以后,返回的信息如下:206Content-Length=106786028Content-Range=bytes 2000070-106786027/106786028Date=Mon, 30 Apr 2001 12:55:20 GMTETag=W/"02ca57e173c11:95b"Content-Type=application/octet-streamServer=Microsoft-IIS/5.0Last-Modified=Mon, 30 Apr 2001 12:55:20 GMT和前面服务器返回的信息比较一下,就会发现增加了一行:Content-Range=bytes 2000070-106786027/106786028返回的代码也改为206了,而不再是200了。知道了以上原理,就可以进行断点续传的编程了。(二)Java实现断点续传的关键几点(1)用什么方法实现提交RANGE: bytes=2000070-。当然用最原始的Socket是肯定能完成的,不过那样太费事了,其实Java的net包中提供了这种功能。代码如下:URL url = new URL("http://www.sjtu.edu.cn/down.zip");HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection ();//设置User-AgenthttpConnection.setRequestProperty("User-Agent","NetFox");//设置断点续传的开始位置httpConnection.setRequestProperty("RANGE","bytes=2000070");//获得输入流InputStream input = httpConnection.getInputStream();从输入流中取出的字节流就是down.zip文件从2000070开始的字节流。大家看,其实断点续传用Java实现起来还是很简单的吧。接下来要做的事就是怎么保存获得的流到文件中去了。保存文件采用的方法。我采用的是IO包中的RandAccessFile类。操作相当简单,假设从2000070处开始保存文件,代码如下:RandomAccess oSavedFile = new RandomAccessFile("down.zip","rw");long nPos = 2000070;//定位文件指针到nPos位置oSavedFile.seek(nPos);byte[] b = new byte[1024];int nRead;//从输入流中读入字节流,然后写到文件中while((nRead=input.read(b,0,1024)) > 0){oSavedFile.write(b,0,nRead);}怎么样,也很简单吧。接下来要做的就是整合成一个完整的程序了。包括一系列的线程控制等等。(三)断点续传内核的实现主要用了6个类,包括一个测试类。SiteFileFetch.java负责整个文件的抓取,控制内部线程(FileSplitterFetch类)。FileSplitterFetch.java负责部分文件的抓取。FileAccess.java负责文件的存储。SiteInfoBean.java要抓取的文件的信息,如文件保存的目录,名字,抓取文件的URL等。Utility.java工具类,放一些简单的方法。TestMethod.java测试类。下面是源程序: /***SiteFileFetch.java*/package NetFox;import java.io.*;import java.net.*;public class SiteFileFetch extends Thread {SiteInfoBean siteInfoBean = null; //文件信息Beanlong[] nStartPos; //开始位置long[] nEndPos; //结束位置FileSplitterFetch[] fileSplitterFetch; //子线程对象long nFileLength; //文件长度boolean bFirst = true; //是否第一次取文件boolean bStop = false; //停止标志File tmpFile; //文件下载的临时信息DataOutputStream output; //输出到文件的输出流public SiteFileFetch(SiteInfoBean bean) throws IOException{siteInfoBean = bean;//tmpFile = File.createTempFile ("zhong","1111",new File(bean.getSFilePath()));tmpFile = new File(bean.getSFilePath()+File.separator + bean.getSFileName()+".info");if(tmpFile.exists ()){bFirst = false;read_nPos();}else{nStartPos = new long[bean.getNSplitter()];nEndPos = new long[bean.getNSplitter()];}}public void run(){//获得文件长度//分割文件//实例FileSplitterFetch//启动FileSplitterFetch线程//等待子线程返回try{if(bFirst){nFileLength = getFileSize();if(nFileLength == -1){System.err.println("File Length is not known!");}else if(nFileLength == -2){System.err.println("File is not access!");}else{for(int i=0;i<nStartPos.length;i++){nStartPos[i] = (long)(i*(nFileLength/nStartPos.length));}for(int i=0;i<nEndPos.length-1;i++){nEndPos[i] = nStartPos[i+1];}nEndPos[nEndPos.length-1] = nFileLength;}}//启动子线程fileSplitterFetch = new FileSplitterFetch[nStartPos.length];for(int i=0;i<nStartPos.length;i++){fileSplitterFetch[i] = new FileSplitterFetch(siteInfoBean.getSSiteURL(),siteInfoBean.getSFilePath() + File.separator + siteInfoBean.getSFileName(),nStartPos[i],nEndPos[i],i);Utility.log("Thread " + i + " , nStartPos = " + nStartPos[i] + ", nEndPos = " + nEndPos[i]);fileSplitterFetch[i].start();}// fileSplitterFetch[nPos.length-1] = new FileSplitterFetch(siteInfoBean.getSSiteURL(),siteInfoBean.getSFilePath() + File.separator + siteInfoBean.getSFileName(),nPos[nPos.length-1],nFileLength,nPos.length-1);// Utility.log("Thread " + (nPos.length-1) + " , nStartPos = " + nPos[nPos.length-1] + ",nEndPos = " + nFileLength);// fileSplitterFetch[nPos.length-1].start();//等待子线程结束//int count = 0;//是否结束while循环boolean breakWhile = false;while(!bStop){write_nPos();Utility.sleep(500);breakWhile = true;for(int i=0;i<nStartPos.length;i++){if(!fileSplitterFetch[i].bDownOver){breakWhile = false;break;}}if(breakWhile)break;//count++;//if(count>4)// siteStop();}System.err.println("文件下载结束!");}catch(Exception e){e.printStackTrace ();}}//获得文件长度public long getFileSize(){int nFileLength = -1;try{URL url = new URL(siteInfoBean.getSSiteURL());HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection ();httpConnection.setRequestProperty("User-Agent","NetFox");int responseCode=httpConnection.getResponseCode();if(responseCode>=400){processErrorCode(responseCode);return -2; //-2 represent access is error}String sHeader;for(int i=1;;i++){//DataInputStream in = new DataInputStream(httpConnection.getInputStream ());//Utility.log(in.readLine());sHeader=httpConnection.getHeaderFieldKey(i);if(sHeader!=null){if(sHeader.equals("Content-Length")){nFileLength = Integer.parseInt(httpConnection.getHeaderField(sHeader));break;}}elsebreak;}}catch(IOException e){e.printStackTrace ();}catch(Exception e){e.printStackTrace ();}Utility.log(nFileLength);return nFileLength;}//保存下载信息(文件指针位置)private void write_nPos(){try{output = new DataOutputStream(new FileOutputStream(tmpFile));output.writeInt(nStartPos.length);for(int i=0;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 ();}}//读取保存的下载信息(文件指针位置)private void read_nPos(){try{DataInputStream input = new DataInputStream(new FileInputStream(tmpFile));int nCount = input.readInt();nStartPos = new long[nCount];nEndPos = new long[nCount];for(int i=0;i<nStartPos.length;i++){nStartPos[i] = input.readLong();nEndPos[i] = 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);}//停止文件下载public void siteStop(){bStop = true;for(int i=0;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 URLlong nStartPos; //File Snippet Start Positionlong nEndPos; //File Snippet End Positionint nThreadID; //Thread's IDboolean bDownOver = false; //Downing is overboolean bStop = false; //Stop identicalFileAccessI fileAccessI = null; //File Access interfacepublic FileSplitterFetch(String sURL,String sName,long nStart,long nEnd,int id) throws IOException{this.sURL = sURL;this.nStartPos = nStart;this.nEndPos = nEnd;nThreadID = id;fileAccessI = new FileAccessI(sName,nStartPos);}public void run(){while(nStartPos < nEndPos && !bStop){try{URL url = new URL(sURL);HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection ();httpConnection.setRequestProperty("User-Agent","NetFox");String sProperty = "bytes="+nStartPos+"-";httpConnection.setRequestProperty("RANGE",sProperty);Utility.log(sProperty);InputStream input = httpConnection.getInputStream();//logResponseHead(httpConnection);byte[] b = new byte[1024];int nRead;while((nRead=input.read(b,0,1024)) > 0 && nStartPos < nEndPos && !bStop){nStartPos += fileAccessI.write(b,0,nRead);//if(nThreadID == 1)// Utility.log("nStartPos = " + nStartPos + ", nEndPos = " + nEndPos);}Utility.log("Thread " + nThreadID + " is over!");bDownOver = true;//nPos = fileAccessI.write (b,0,nRead);}catch(Exception e){e.printStackTrace ();}}}//打印回应的头信息public void logResponseHead(HttpURLConnection con){for(int i=1;;i++){String header=con.getHeaderFieldKey(i);if(header!=null)//responseHeaders.put(header,httpConnection.getHeaderField(header));Utility.log(header+" : "+con.getHeaderField(header));elsebreak;}}public void splitterStop(){bStop = 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 = new RandomAccessFile(sName,"rw");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;}}/***SiteInfoBean.java*/package NetFox;public class SiteInfoBean {private String sSiteURL; //Site's URLprivate String sFilePath; //Saved File's Pathprivate String sFileName; //Saved File's Nameprivate int nSplitter; //Count of Splited Downloading Filepublic SiteInfoBean(){//default value of nSplitter is 5this("","","",5);}public SiteInfoBean(String sURL,String sPath,String sName,int nSpiltter){sSiteURL= sURL;sFilePath = sPath;sFileName = sName;this.nSplitter = nSpiltter;}public String getSSiteURL(){return sSiteURL;}public void setSSiteURL(String value){sSiteURL = value;}public String getSFilePath(){return sFilePath;}public void setSFilePath(String value){sFilePath = value;}public String getSFileName(){return sFileName;}public void setSFileName(String value){sFileName = value;}public int getNSplitter(){return nSplitter;}public void setNSplitter(int nCount){nSplitter = 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.exetry{SiteInfoBean bean = new SiteInfoBean("http://localhost/xx/weblogic60b2_win.exe","L:\\temp","weblogic60b2_win.exe",5);//SiteInfoBean bean = new SiteInfoBean("http://localhost:8080/down.zip","L:\\temp","weblogic60b2_win.exe",5);SiteFileFetch fileFetch = new SiteFileFetch(bean);fileFetch.start();}catch(Exception e){e.printStackTrace ();}}public static void main(String[] args){new TestMethod();}} 借花献佛::)如果你比较细心的话,你会发现当用蚂蚁下载的时候,如果把提交者(Referer)属性清空,则用蚂蚁也不能下载了,下载下来的是提醒你的JPG图片……因为下载的时候,服务器会读取你的Referer属性,然后判断这个属性指向的网址是否属于他的域,是才让你下载,所以,用JAVA写下载程序的时候,记得把这个属性提交就行了……只需要这样就行:Referer: http://www.9sky.com/9sky2/cd/adddown.asp根据上面文章中的设置方法,加上这一句就OK了:httpConnection.setRequestProperty("Referer","http://www.9sky.com/9sky2/cd/adddown.asp");我还没有试过,不过应该可以的……你试试,不行再说一下,我再看看…… 回复人: bootcool(bootcool) (2001-8-23 16:06:15) 得0分 我想了一下那个问题, 又查看了netants下载时发送给服务器的信息, 发现关键有一处很重要。 这是netants发送的消息:2001/08/22 20:33:25 解析主机地址 ...2001/08/22 20:33:25 主机地址已确认2001/08/22 20:33:25 连接到主机 (downb.9sky.com:84) ...2001/08/22 20:33:25 成功连接到主机2001/08/22 20:33:25 GET /10mp3/248_4310_45680.mp3 HTTP/1.12001/08/22 20:33:25 Host: downb.9sky.com:842001/08/22 20:33:25 Accept: */*2001/08/22 20:33:25 Referer: http://www.9sky.com/9sky2/cd/adddown.asp?ss_id=45680&dntype=1&si_cname=玛莉雅%20凯瑞2001/08/22 20:33:25 User-Agent: Mozilla/4.06 [en] (Win98; I)2001/08/22 20:33:25 Pragma: no-cache2001/08/22 20:33:25 Cache-Control: no-cache2001/08/22 20:33:25 Connection: close2001/08/22 20:33:25 Range: bytes=51200-其中提交 Referer:很重要。这是用socket解决的方法:import java.io.*;import java.net.*;public class HTTPTest {public HTTPTest(){}public static void main(String args[]){try{ final int PORT =84; InetAddress ip = InetAddress.getByName("downb.9sky.com"); Socket socket =new Socket(ip,PORT); BufferedReader in =new BufferedReader( new InputStreamReader(socket.getInputStream())); PrintWriter out =new PrintWriter(socket.getOutputStream(),true); send(out, "GET /10mp3/248_4310_45680.mp3 HTTP/1.1 \r\n" +"Host: downb.9sky.com:84\r\n" +"Accept: */*\r\n" +"Referer: http://www.9sky.com/9sky2/cd/adddown.asp?ss_id=45676&dntype=1&si_cname=玛莉雅%20凯瑞\r\n" +"User-Agent: NetFox/0.9\r\n" +"Pragma: no-cache\r\n" +"Cache-Control: no-cache\r\n" +"Connection: close\r\n"); String fileline = null; while((fileline = in.readLine())!=null){ System.out.println(fileline); } } catch(Exception e){}}static void send (PrintWriter out, String command) throws IOException{ out.println(command); }}/////////////////////////////////////////////////////////////////////////////以下是对作者的程序的一些改进关键是要设置该下载连接是从哪个网页提交的,即referer。这样就可以了。只是用户要自己输入referer网页的url,以及要下载的文件的url.我想一般情况下服务器都不验证是从哪个网页referer过来的。SiteFileFetch.javaimport java.io.*;import java.net.*;public class SiteFileFetch implements Runnable {private SiteInfoBean siteInfoBean = null; private long[] nStartPos; private long[] nEndPos; private FileSplitterFetch[] fileSplitterFetch; private long nFileLength; private boolean bFirst = true; private boolean bStop = false; private File tmpFile; private DataOutputStream output;public SiteFileFetch(SiteInfoBean bean) throws IOException{ siteInfoBean = bean; tmpFile = new File(bean.getSFilePath()+File.separator + bean.getSFileName()+".info"); if(tmpFile.exists ()){ bFirst = false; read_nPos(); } else{ nStartPos = new long[bean.getNSplitter()]; nEndPos = new long[bean.getNSplitter()]; }}public void start(){ Thread t = new Thread(this); t.start(); try{ t.join(5); } catch (Exception exception){}}public void run(){ try{ if(bFirst){ nFileLength = getFileSize(); if(nFileLength == -1){ System.err.println("File Length is not known!"); } else if(nFileLength == -2){ System.err.println("File is not access!"); } else{ for(int i=0;i<nStartPos.length;i++) nStartPos[i] = (long)(i*(nFileLength/nStartPos.length)); for(int i=0;i<nEndPos.length-1;i++) nEndPos[i] = nStartPos[i+1]; nEndPos[nEndPos.length-1] = nFileLength; } } fileSplitterFetch = new FileSplitterFetch[nStartPos.length]; for(int i=0;i<nStartPos.length;i++){ fileSplitterFetch[i] = new FileSplitterFetch(siteInfoBean.getSSiteURL(), siteInfoBean.getSFilePath() + File.separator + siteInfoBean.getSFileName(), nStartPos[i],nEndPos[i],i); Utility.log("Thread " + i + " , nStartPos = " + nStartPos[i] + ", nEndPos = " + nEndPos[i]); fileSplitterFetch[i].start(); } boolean breakWhile = false; while(!bStop){ write_nPos(); Utility.sleep(100); breakWhile = true; for(int i=0;i<nStartPos.length;i++){ if(!fileSplitterFetch[i].bDownOver){ breakWhile = false; break; } } if(breakWhile){ siteStop(); } } System.err.println("文件下载结束!"); } catch(Exception e){e.printStackTrace ();}} public long getFileSize(){ int nFileLength = -1; try{ URL url= new URL(siteInfoBean.getSSiteURL()); HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection(); httpConnection.setUseCaches(false); httpConnection.setDoOutput(true); httpConnection.setRequestProperty("GET",url.getFile()); httpConnection.setRequestProperty("Host","downb.9sky.com:84"); httpConnection.setRequestProperty("Accept","*'/'*"); httpConnection.setRequestProperty("Referer","http://www.9sky.com/9sky2/cd/adddown.asp?ss_id=45676&dntype=1&si_cname=玛莉雅%20凯瑞"); httpConnection.setRequestProperty("User-Agent","NetFox"); httpConnection.setRequestProperty("Pragma","no-cache"); httpConnection.setRequestProperty("Cache-Control","no-cache"); httpConnection.setRequestProperty("Connection","close"); int responseCode=httpConnection.getResponseCode(); if(responseCode>=400){ processErrorCode(responseCode); return -2; } String sHeader; for(int i=1;;i++){ sHeader=httpConnection.getHeaderFieldKey(i); if(sHeader!=null){ System.out.println(httpConnection.getHeaderField(sHeader)); if(sHeader.equals("Content-Length")){ nFileLength = Integer.parseInt(httpConnection.getHeaderField(sHeader)); break; } } else break; } } catch(IOException e){e.printStackTrace ();} catch(Exception e){e.printStackTrace ();} Utility.log(nFileLength); return nFileLength;}private void write_nPos(){ try{ output = new DataOutputStream(new FileOutputStream(tmpFile)); output.writeInt(nStartPos.length); for(int i=0;i<nStartPos.length;i++){ output.writeLong(fileSplitterFetch[i].nStartPos); output.writeLong(fileSplitterFetch[i].nEndPos); } output.close(); } catch(IOException e){e.printStackTrace ();} catch(Exception e){e.printStackTrace ();}} private void read_nPos(){ try{ DataInputStream input = new DataInputStream(new FileInputStream(tmpFile)); int nCount = input.readInt(); nStartPos = new long[nCount]; nEndPos = new long[nCount]; for(int i=0;i<nStartPos.length;i++){ nStartPos[i] = input.readLong(); nEndPos[i] = 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); } public void siteStop(){ bStop = true; for(int i=0;i<nStartPos.length;i++) fileSplitterFetch[i].splitterStop(); }}/////////////////////////////////////////////////////////////////////////FileSplitterFetch.javaimport java.io.*;import java.net.*;import java.util.*;public class FileSplitterFetch extends Thread { private String sURL; public long nStartPos; public long nEndPos; private int nThreadID; public boolean bDownOver = false; private boolean bStop = false; private FileAccessI fileAccessI = null; public FileSplitterFetch(String sURL,String sName,long nStart,long nEnd,int id) throws IOException{ this.sURL = sURL; this.nStartPos = nStart; this.nEndPos = nEnd; nThreadID = id; fileAccessI = new FileAccessI(sName,nStartPos);}public void run(){ while(nStartPos < nEndPos && !bStop) { try{ URL url = new URL("http","downb.9sky.com",84,"/10mp3/248_4310_45680.mp3"); URLConnection urlConnection = url.openConnection(); urlConnection.setRequestProperty("GET",url.getFile()); urlConnection.setRequestProperty("Host","downb.9sky.com:84"); urlConnection.setRequestProperty("Accept","*'/'*"); urlConnection.setRequestProperty("Referer","http://www.9sky.com/9sky2/cd/adddown.asp?ss_id=45676&dntype=1&si_cname=玛莉雅%20凯瑞"); urlConnection.setRequestProperty("User-Agent","NetFox"); urlConnection.setRequestProperty("Pragma","no-cache"); urlConnection.setRequestProperty("Cache-Control","no-cache"); urlConnection.setRequestProperty("Connection","close"); String sProperty = "bytes="+nStartPos+"-"; urlConnection.setRequestProperty("RANGE",sProperty); Utility.log(sProperty); InputStream input = urlConnection.getInputStream(); byte[] b = new byte[1024]; int nRead; while((nRead=input.read(b,0,1024)) > 0 && nStartPos < nEndPos && !bStop) nStartPos += fileAccessI.write(b,0,nRead); System.out.println(nThreadID+":"+nStartPos); } catch(Exception e){e.printStackTrace ();}}bDownOver = true;Utility.log("Thread " + nThreadID + " is over!");}public void logResponseHead(HttpURLConnection con){ for(int i=1;;i++){ String header=con.getHeaderFieldKey(i); if(header!=null) Utility.log(header+" : "+con.getHeaderField(header)); else break; }}public void splitterStop(){ bStop = true;}} 谢谢,不过如果连接协议是https而不是http,如上原理还能行的通吗? to linger521(chyu)我也不知道。:( super的用法(初学者问题) 怎么知道一个java.sql.Timestamp表示的时间距离现在多少个工作日? 我有一个笔试,题目,哪位大侠能帮忙作一下笔试题目? 如何用Java实现多个图层的切换? Java有没有形参,实参,引用,指针? 学习开发JAVA程序都需要哪些工具啊?请教大侠!----在线等 如何把java代码编译成*.exe的应用程序 delphi vs java Java中放图片的问题? 请问如何知道邮件中的邮件哪个是新邮件,我是用POP3协议。请各位大虾指点一下。 To cna fly 关于路径的问题!!!谢谢
其实断点续传的原理很简单,就是在Http的请求上和一般的下载有所不同而已。
打个比方,浏览器请求服务器上的一个文时,所发出的请求如下:
假设服务器域名为wwww.sjtu.edu.cn,文件名为down.zip。
GET /down.zip HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-
excel, application/msword, application/vnd.ms-powerpoint, */*
Accept-Language: zh-cn
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)
Connection: Keep-Alive
服务器收到请求后,按要求寻找请求的文件,提取文件的信息,然后返回给浏览器,返回信息如下:
200
Content-Length=106786028
Accept-Ranges=bytes
Date=Mon, 30 Apr 2001 12:56:11 GMT
ETag=W/"02ca57e173c11:95b"
Content-Type=application/octet-stream
Server=Microsoft-IIS/5.0
Last-Modified=Mon, 30 Apr 2001 12:56:11 GMT 所谓断点续传,也就是要从文件已经下载的地方开始继续下载。所以在客户端浏览器传给
Web服务器的时候要多加一条信息--从哪里开始。
下面是用自己编的一个"浏览器"来传递请求信息给Web服务器,要求从2000070字节开始。
GET /down.zip HTTP/1.0
User-Agent: NetFox
RANGE: bytes=2000070-
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
仔细看一下就会发现多了一行RANGE: bytes=2000070-
这一行的意思就是告诉服务器down.zip这个文件从2000070字节开始传,前面的字节不用传了。
服务器收到这个请求以后,返回的信息如下:
206
Content-Length=106786028
Content-Range=bytes 2000070-106786027/106786028
Date=Mon, 30 Apr 2001 12:55:20 GMT
ETag=W/"02ca57e173c11:95b"
Content-Type=application/octet-stream
Server=Microsoft-IIS/5.0
Last-Modified=Mon, 30 Apr 2001 12:55:20 GMT
和前面服务器返回的信息比较一下,就会发现增加了一行:
Content-Range=bytes 2000070-106786027/106786028
返回的代码也改为206了,而不再是200了。
知道了以上原理,就可以进行断点续传的编程了。
(二)Java实现断点续传的关键几点
(1)用什么方法实现提交RANGE: bytes=2000070-。
当然用最原始的Socket是肯定能完成的,不过那样太费事了,其实Java的net包中提供了这种功能。代码如下:
URL url = new URL("http://www.sjtu.edu.cn/down.zip");
HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection ();
//设置User-Agent
httpConnection.setRequestProperty("User-Agent","NetFox");
//设置断点续传的开始位置
httpConnection.setRequestProperty("RANGE","bytes=2000070");
//获得输入流
InputStream input = httpConnection.getInputStream();
从输入流中取出的字节流就是down.zip文件从2000070开始的字节流。
大家看,其实断点续传用Java实现起来还是很简单的吧。
接下来要做的事就是怎么保存获得的流到文件中去了。
保存文件采用的方法。
我采用的是IO包中的RandAccessFile类。
操作相当简单,假设从2000070处开始保存文件,代码如下:
RandomAccess oSavedFile = new RandomAccessFile("down.zip","rw");
long nPos = 2000070;
//定位文件指针到nPos位置
oSavedFile.seek(nPos);
byte[] b = new byte[1024];
int nRead;
//从输入流中读入字节流,然后写到文件中
while((nRead=input.read(b,0,1024)) > 0)
{
oSavedFile.write(b,0,nRead);
}怎么样,也很简单吧。
接下来要做的就是整合成一个完整的程序了。包括一系列的线程控制等等。(三)断点续传内核的实现
主要用了6个类,包括一个测试类。
SiteFileFetch.java负责整个文件的抓取,控制内部线程(FileSplitterFetch类)。
FileSplitterFetch.java负责部分文件的抓取。
FileAccess.java负责文件的存储。
SiteInfoBean.java要抓取的文件的信息,如文件保存的目录,名字,抓取文件的URL等。
Utility.java工具类,放一些简单的方法。
TestMethod.java测试类。
下面是源程序:
/*
**SiteFileFetch.java
*/
package NetFox;
import java.io.*;
import java.net.*;
public class SiteFileFetch extends Thread {
SiteInfoBean siteInfoBean = null; //文件信息Bean
long[] nStartPos; //开始位置
long[] nEndPos; //结束位置
FileSplitterFetch[] fileSplitterFetch; //子线程对象
long nFileLength; //文件长度
boolean bFirst = true; //是否第一次取文件
boolean bStop = false; //停止标志
File tmpFile; //文件下载的临时信息
DataOutputStream output; //输出到文件的输出流
public SiteFileFetch(SiteInfoBean bean) throws IOException
{
siteInfoBean = bean;
//tmpFile = File.createTempFile ("zhong","1111",new File(bean.getSFilePath()));
tmpFile = new File(bean.getSFilePath()+File.separator + bean.getSFileName()+".info");
if(tmpFile.exists ())
{
bFirst = false;
read_nPos();
}
else
{
nStartPos = new long[bean.getNSplitter()];
nEndPos = new long[bean.getNSplitter()];
}}
public void run()
{
//获得文件长度
//分割文件
//实例FileSplitterFetch
//启动FileSplitterFetch线程
//等待子线程返回
try{
if(bFirst)
{
nFileLength = getFileSize();
if(nFileLength == -1)
{
System.err.println("File Length is not known!");
}
else if(nFileLength == -2)
{
System.err.println("File is not access!");
}
else
{
for(int i=0;i<nStartPos.length;i++)
{
nStartPos[i] = (long)(i*(nFileLength/nStartPos.length));
}
for(int i=0;i<nEndPos.length-1;i++)
{
nEndPos[i] = nStartPos[i+1];
}
nEndPos[nEndPos.length-1] = nFileLength;
}
}
//启动子线程
fileSplitterFetch = new FileSplitterFetch[nStartPos.length];
for(int i=0;i<nStartPos.length;i++)
{
fileSplitterFetch[i] = new FileSplitterFetch(siteInfoBean.getSSiteURL(),
siteInfoBean.getSFilePath() + File.separator + siteInfoBean.getSFileName(),
nStartPos[i],nEndPos[i],i);
Utility.log("Thread " + i + " , nStartPos = " + nStartPos[i] + ", nEndPos = " + nEndPos[i]);
fileSplitterFetch[i].start();
}
// fileSplitterFetch[nPos.length-1] = new FileSplitterFetch(siteInfoBean.getSSiteURL(),
siteInfoBean.getSFilePath() + File.separator + siteInfoBean.getSFileName(),nPos[nPos.length-1],nFileLength,nPos.length-1);
// Utility.log("Thread " + (nPos.length-1) + " , nStartPos = " + nPos[nPos.length-1] + ",
nEndPos = " + nFileLength);
// fileSplitterFetch[nPos.length-1].start();
//等待子线程结束
//int count = 0;
//是否结束while循环
boolean breakWhile = false;
while(!bStop)
{
write_nPos();
Utility.sleep(500);
breakWhile = true;
for(int i=0;i<nStartPos.length;i++)
{
if(!fileSplitterFetch[i].bDownOver)
{
breakWhile = false;
break;
}
}
if(breakWhile)
break;
//count++;
//if(count>4)
// siteStop();
}
System.err.println("文件下载结束!");
}
catch(Exception e){e.printStackTrace ();}
}
//获得文件长度
public long getFileSize()
{
int nFileLength = -1;
try{
URL url = new URL(siteInfoBean.getSSiteURL());
HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection ();
httpConnection.setRequestProperty("User-Agent","NetFox");
int responseCode=httpConnection.getResponseCode();
if(responseCode>=400)
{
processErrorCode(responseCode);
return -2; //-2 represent access is error
}
String sHeader;
for(int i=1;;i++)
{
//DataInputStream in = new DataInputStream(httpConnection.getInputStream ());
//Utility.log(in.readLine());
sHeader=httpConnection.getHeaderFieldKey(i);
if(sHeader!=null)
{
if(sHeader.equals("Content-Length"))
{
nFileLength = Integer.parseInt(httpConnection.getHeaderField(sHeader));
break;
}
}
else
break;
}
}
catch(IOException e){e.printStackTrace ();}
catch(Exception e){e.printStackTrace ();}
Utility.log(nFileLength);
return nFileLength;
}
//保存下载信息(文件指针位置)
private void write_nPos()
{
try{
output = new DataOutputStream(new FileOutputStream(tmpFile));
output.writeInt(nStartPos.length);
for(int i=0;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 ();}
}
//读取保存的下载信息(文件指针位置)
private void read_nPos()
{
try{
DataInputStream input = new DataInputStream(new FileInputStream(tmpFile));
int nCount = input.readInt();
nStartPos = new long[nCount];
nEndPos = new long[nCount];
for(int i=0;i<nStartPos.length;i++)
{
nStartPos[i] = input.readLong();
nEndPos[i] = 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);
}
//停止文件下载
public void siteStop()
{
bStop = true;
for(int i=0;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 = false; //Downing is over
boolean bStop = false; //Stop identical
FileAccessI fileAccessI = null; //File Access interface
public FileSplitterFetch(String sURL,String sName,long nStart,long nEnd,int id) throws IOException
{
this.sURL = sURL;
this.nStartPos = nStart;
this.nEndPos = nEnd;
nThreadID = id;
fileAccessI = new FileAccessI(sName,nStartPos);
}
public void run()
{
while(nStartPos < nEndPos && !bStop)
{
try{
URL url = new URL(sURL);
HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection ();
httpConnection.setRequestProperty("User-Agent","NetFox");
String sProperty = "bytes="+nStartPos+"-";
httpConnection.setRequestProperty("RANGE",sProperty);
Utility.log(sProperty);
InputStream input = httpConnection.getInputStream();
//logResponseHead(httpConnection);
byte[] b = new byte[1024];
int nRead;
while((nRead=input.read(b,0,1024)) > 0 && nStartPos < nEndPos && !bStop)
{
nStartPos += fileAccessI.write(b,0,nRead);
//if(nThreadID == 1)
// Utility.log("nStartPos = " + nStartPos + ", nEndPos = " + nEndPos);
}
Utility.log("Thread " + nThreadID + " is over!");
bDownOver = true;
//nPos = fileAccessI.write (b,0,nRead);
}
catch(Exception e){e.printStackTrace ();}
}
}
//打印回应的头信息
public void logResponseHead(HttpURLConnection con)
{
for(int i=1;;i++)
{
String header=con.getHeaderFieldKey(i);
if(header!=null)
//responseHeaders.put(header,httpConnection.getHeaderField(header));
Utility.log(header+" : "+con.getHeaderField(header));
else
break;
}
}
public void splitterStop()
{
bStop = 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 = new RandomAccessFile(sName,"rw");
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;
}
}
/*
**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= sURL;
sFilePath = sPath;
sFileName = sName;
this.nSplitter = nSpiltter;
}
public String getSSiteURL()
{
return sSiteURL;
}
public void setSSiteURL(String value)
{
sSiteURL = value;
}
public String getSFilePath()
{
return sFilePath;
}
public void setSFilePath(String value)
{
sFilePath = value;
}
public String getSFileName()
{
return sFileName;
}
public void setSFileName(String value)
{
sFileName = value;
}
public int getNSplitter()
{
return nSplitter;
}
public void setNSplitter(int nCount)
{
nSplitter = 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 = new SiteInfoBean("http://localhost/xx/weblogic60b2_win.exe","L:\\temp","weblogic60b2_win.exe",5);
//SiteInfoBean bean = new SiteInfoBean("http://localhost:8080/down.zip","L:\\temp","weblogic60b2_win.exe",5);
SiteFileFetch fileFetch = new SiteFileFetch(bean);
fileFetch.start();
}
catch(Exception e){e.printStackTrace ();}
}
public static void main(String[] args)
{
new TestMethod();
}
}
因为下载的时候,服务器会读取你的Referer属性,然后判断这个属性指向的网址是否属于他的域,是才让你下载,所以,用JAVA写下载程序的时候,记得把这个属性提交就行了……
只需要这样就行:Referer: http://www.9sky.com/9sky2/cd/adddown.asp根据上面文章中的设置方法,加上这一句就OK了:
httpConnection.setRequestProperty("Referer","http://www.9sky.com/9sky2/cd/adddown.asp");
我还没有试过,不过应该可以的……你试试,不行再说一下,我再看看……
回复人: bootcool(bootcool) (2001-8-23 16:06:15) 得0分
我想了一下那个问题,
又查看了netants下载时发送给服务器的信息,
发现关键有一处很重要。
这是netants发送的消息:2001/08/22 20:33:25 解析主机地址 ...
2001/08/22 20:33:25 主机地址已确认
2001/08/22 20:33:25 连接到主机 (downb.9sky.com:84) ...
2001/08/22 20:33:25 成功连接到主机
2001/08/22 20:33:25 GET /10mp3/248_4310_45680.mp3 HTTP/1.1
2001/08/22 20:33:25 Host: downb.9sky.com:84
2001/08/22 20:33:25 Accept: */*
2001/08/22 20:33:25 Referer: http://www.9sky.com/9sky2/cd/adddown.asp?ss_id=45680&dntype=1&si_cname=玛莉雅%20凯瑞
2001/08/22 20:33:25 User-Agent: Mozilla/4.06 [en] (Win98; I)
2001/08/22 20:33:25 Pragma: no-cache
2001/08/22 20:33:25 Cache-Control: no-cache
2001/08/22 20:33:25 Connection: close
2001/08/22 20:33:25 Range: bytes=51200-其中提交 Referer:很重要。
这是用socket解决的方法:
import java.io.*;
import java.net.*;public class HTTPTest {
public HTTPTest(){
}public static void main(String args[]){
try{
final int PORT =84;
InetAddress ip = InetAddress.getByName("downb.9sky.com");
Socket socket =new Socket(ip,PORT);
BufferedReader in =new BufferedReader(
new InputStreamReader(socket.getInputStream()));
PrintWriter out =new PrintWriter(socket.getOutputStream(),true);
send(out, "GET /10mp3/248_4310_45680.mp3 HTTP/1.1 \r\n"
+"Host: downb.9sky.com:84\r\n"
+"Accept: */*\r\n"
+"Referer: http://www.9sky.com/9sky2/cd/adddown.asp?ss_id=45676&dntype=1&si_cname=玛莉雅%20凯瑞\r\n"
+"User-Agent: NetFox/0.9\r\n"
+"Pragma: no-cache\r\n"
+"Cache-Control: no-cache\r\n"
+"Connection: close\r\n");
String fileline = null;
while((fileline = in.readLine())!=null){
System.out.println(fileline);
}
}
catch(Exception e){}
}static void send (PrintWriter out, String command)
throws IOException{
out.println(command);
}
}
/////////////////////////////////////////////////////////////////////////////
以下是对作者的程序的一些改进
关键是要设置该下载连接是从哪个网页提交的,即referer。
这样就可以了。只是用户要自己输入referer网页的url,以及要下载的文件的url.
我想一般情况下服务器都不验证是从哪个网页referer过来的。SiteFileFetch.javaimport java.io.*;
import java.net.*;public class SiteFileFetch implements Runnable {private SiteInfoBean siteInfoBean = null;
private long[] nStartPos;
private long[] nEndPos;
private FileSplitterFetch[] fileSplitterFetch;
private long nFileLength;
private boolean bFirst = true;
private boolean bStop = false;
private File tmpFile;
private DataOutputStream output;public SiteFileFetch(SiteInfoBean bean) throws IOException{
siteInfoBean = bean;
tmpFile = new File(bean.getSFilePath()+File.separator + bean.getSFileName()+".info");
if(tmpFile.exists ()){
bFirst = false;
read_nPos();
}
else{
nStartPos = new long[bean.getNSplitter()];
nEndPos = new long[bean.getNSplitter()];
}
}public void start(){
Thread t = new Thread(this);
t.start();
try{
t.join(5);
}
catch (Exception exception){}
}public void run(){
try{
if(bFirst){
nFileLength = getFileSize();
if(nFileLength == -1){
System.err.println("File Length is not known!");
}
else if(nFileLength == -2){
System.err.println("File is not access!");
}
else{
for(int i=0;i<nStartPos.length;i++)
nStartPos[i] = (long)(i*(nFileLength/nStartPos.length));
for(int i=0;i<nEndPos.length-1;i++)
nEndPos[i] = nStartPos[i+1];
nEndPos[nEndPos.length-1] = nFileLength;
}
}
fileSplitterFetch = new FileSplitterFetch[nStartPos.length];
for(int i=0;i<nStartPos.length;i++){
fileSplitterFetch[i] = new FileSplitterFetch(siteInfoBean.getSSiteURL(),
siteInfoBean.getSFilePath() + File.separator + siteInfoBean.getSFileName(),
nStartPos[i],nEndPos[i],i);
Utility.log("Thread " + i + " , nStartPos = " + nStartPos[i] + ", nEndPos = " + nEndPos[i]);
fileSplitterFetch[i].start();
}
boolean breakWhile = false;
while(!bStop){
write_nPos();
Utility.sleep(100);
breakWhile = true;
for(int i=0;i<nStartPos.length;i++){
if(!fileSplitterFetch[i].bDownOver){
breakWhile = false;
break;
}
}
if(breakWhile){
siteStop();
}
}
System.err.println("文件下载结束!");
}
catch(Exception e){e.printStackTrace ();}
}
public long getFileSize(){
int nFileLength = -1;
try{
URL url= new URL(siteInfoBean.getSSiteURL());
HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection();
httpConnection.setUseCaches(false);
httpConnection.setDoOutput(true);
httpConnection.setRequestProperty("GET",url.getFile());
httpConnection.setRequestProperty("Host","downb.9sky.com:84");
httpConnection.setRequestProperty("Accept","*'/'*");
httpConnection.setRequestProperty("Referer","http://www.9sky.com/9sky2/cd/adddown.asp?ss_id=45676&dntype=1&si_cname=玛莉雅%20凯瑞");
httpConnection.setRequestProperty("User-Agent","NetFox");
httpConnection.setRequestProperty("Pragma","no-cache");
httpConnection.setRequestProperty("Cache-Control","no-cache");
httpConnection.setRequestProperty("Connection","close");
int responseCode=httpConnection.getResponseCode();
if(responseCode>=400){
processErrorCode(responseCode);
return -2;
}
String sHeader;
for(int i=1;;i++){
sHeader=httpConnection.getHeaderFieldKey(i);
if(sHeader!=null){
System.out.println(httpConnection.getHeaderField(sHeader));
if(sHeader.equals("Content-Length")){
nFileLength = Integer.parseInt(httpConnection.getHeaderField(sHeader));
break;
}
}
else break;
}
}
catch(IOException e){e.printStackTrace ();}
catch(Exception e){e.printStackTrace ();}
Utility.log(nFileLength);
return nFileLength;
}private void write_nPos(){
try{
output = new DataOutputStream(new FileOutputStream(tmpFile));
output.writeInt(nStartPos.length);
for(int i=0;i<nStartPos.length;i++){
output.writeLong(fileSplitterFetch[i].nStartPos);
output.writeLong(fileSplitterFetch[i].nEndPos);
}
output.close();
}
catch(IOException e){e.printStackTrace ();}
catch(Exception e){e.printStackTrace ();}
}
private void read_nPos(){
try{
DataInputStream input = new DataInputStream(new FileInputStream(tmpFile));
int nCount = input.readInt();
nStartPos = new long[nCount];
nEndPos = new long[nCount];
for(int i=0;i<nStartPos.length;i++){
nStartPos[i] = input.readLong();
nEndPos[i] = 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);
} public void siteStop(){
bStop = true;
for(int i=0;i<nStartPos.length;i++)
fileSplitterFetch[i].splitterStop();
}
}
/////////////////////////////////////////////////////////////////////////
FileSplitterFetch.java
import java.io.*;
import java.net.*;
import java.util.*;public class FileSplitterFetch extends Thread { private String sURL;
public long nStartPos;
public long nEndPos;
private int nThreadID;
public boolean bDownOver = false;
private boolean bStop = false;
private FileAccessI fileAccessI = null; public FileSplitterFetch(String sURL,String sName,long nStart,long nEnd,int id) throws IOException{
this.sURL = sURL;
this.nStartPos = nStart;
this.nEndPos = nEnd;
nThreadID = id;
fileAccessI = new FileAccessI(sName,nStartPos);
}public void run(){
while(nStartPos < nEndPos && !bStop) {
try{
URL url = new URL("http","downb.9sky.com",84,"/10mp3/248_4310_45680.mp3");
URLConnection urlConnection = url.openConnection();
urlConnection.setRequestProperty("GET",url.getFile());
urlConnection.setRequestProperty("Host","downb.9sky.com:84");
urlConnection.setRequestProperty("Accept","*'/'*");
urlConnection.setRequestProperty("Referer","http://www.9sky.com/9sky2/cd/adddown.asp?ss_id=45676&dntype=1&si_cname=玛莉雅%20凯瑞");
urlConnection.setRequestProperty("User-Agent","NetFox");
urlConnection.setRequestProperty("Pragma","no-cache");
urlConnection.setRequestProperty("Cache-Control","no-cache");
urlConnection.setRequestProperty("Connection","close");
String sProperty = "bytes="+nStartPos+"-";
urlConnection.setRequestProperty("RANGE",sProperty);
Utility.log(sProperty);
InputStream input = urlConnection.getInputStream();
byte[] b = new byte[1024];
int nRead;
while((nRead=input.read(b,0,1024)) > 0 && nStartPos < nEndPos && !bStop)
nStartPos += fileAccessI.write(b,0,nRead);
System.out.println(nThreadID+":"+nStartPos);
}
catch(Exception e){e.printStackTrace ();}
}
bDownOver = true;
Utility.log("Thread " + nThreadID + " is over!");
}public void logResponseHead(HttpURLConnection con){
for(int i=1;;i++){
String header=con.getHeaderFieldKey(i);
if(header!=null)
Utility.log(header+" : "+con.getHeaderField(header));
else break;
}
}public void splitterStop(){
bStop = true;
}
}
我也不知道。:(