可能有如下几个原因:
一。NetAnts有自己的连接方式,9SKY对其作了特别分析,只让NetAnts或FlashGet下载
二。注意Refer页,9SKY一般是用右键菜单选择"用…下载"进行下载的,这样FlashGet等就会在下载时向服务器发送这个下载URL是从哪个页面得来的,服务器检查它是不是合法的。
一。NetAnts有自己的连接方式,9SKY对其作了特别分析,只让NetAnts或FlashGet下载
二。注意Refer页,9SKY一般是用右键菜单选择"用…下载"进行下载的,这样FlashGet等就会在下载时向服务器发送这个下载URL是从哪个页面得来的,服务器检查它是不是合法的。
谢谢。
但是你看过没有,在www.9sky.com
中下载Mp3文件只支持netants,这是为什么呢?
用java的urlconnection不能正确下载。
难道用自己用socket,实现http协议吗?
敬请提示。
手头上刚好有一篇这样的文档。(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/1.1
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();
}
}
我已经看过了。
不过你试过没有,用它去下载www.9sky.com上的mp3就不行。
www.9sky.com上的mp3下载只能用netants这是为什么呢?
有什么建议吗?
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……
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;
}
}
至少是关于每个 http 头的描述要看一遍,弄懂。
只是,现在的工作中大多没有那么多时间去看。只有自己为自己编代码的时候,才能够真正找到编程的乐趣。
他确实是应该只是判断是否属于这个域而已……