社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 11100阅读
  • 0回复

http断点续传简单实现(java)

发帖
8
铜板
1641
人品值
95
贡献值
0
交易币
0
好评度
8
信誉值
0
金币
0
所在楼道
/* 3!OO_  
**SiteFileFetch.java }Efz+>F 02  
*/ =D"H0w <zw  
package NetFox; 6 pQbh*  
import java.io.*; 2o\GU  
import java.net.*; ENEnHu^  
pEn3:.l<  
`"#0\Wh  
public class SiteFileFetch extends Thread { cfg_xrW0^  
w{HDCPuS  
NETji:d  
SiteInfoBean siteInfoBean = null; //文件信息Bean (K}Md~  
long[] nStartPos; //开始位置 qOi3`6LCV  
long[] nEndPos; //结束位置 82q_"y>6  
FileSplitterFetch[] fileSplitterFetch; //子线程对象 F[65)"^  
long nFileLength; //文件长度 =q4 QBAW  
boolean bFirst = true; //是否第一次取文件 a BHV  
boolean bStop = false; //停止标志 R'.YE;leBG  
File tmpFile; //文件下载的临时信息 jxt^d  
DataOutputStream output; //输出到文件的输出流 VHUOI64*  
'h:[[D%H`  
//负责整个文件的抓取,控制内部线程(FileSplitterFetch类) 4 <&8`Q  
public SiteFileFetch(SiteInfoBean bean) throws IOException 6$l6>A  
{ 2Q/#.lNL  
siteInfoBean = bean; qDPpGI-Y2e  
//tmpFile = File.createTempFile ("zhong","1111",new File(bean.getSFilePath())); Ijs"KAW ?  
tmpFile = new File(bean.getSFilePath()+File.separator + bean.getSFileName()+".info"); u3Jsu=Nx-  
if(tmpFile.exists ()) ^&|$&7  
{ |RdiM&C7  
bFirst = false; n5yPUJK2L6  
read_nPos(); !N:: 1c@C  
} 3XeCaq'N  
else QvF UFawN  
{ [8sL);pJO  
nStartPos = new long[bean.getNSplitter()]; X`QfOs#\  
nEndPos = new long[bean.getNSplitter()];  B3Yj  
} o3mxtE]  
)%}?p2.  
Q%AD6G(7  
gkN|3^  
} ];|;")#=  
BU|bo")  
~ 3HI;  
public void run() ?b&~(,A{  
{ ,uFdhA(i@'  
//获得文件长度 nvyyV\w  
//分割文件 2yFXX9!@  
//实例FileSplitterFetch ZUW~ZZ7Z:  
//启动FileSplitterFetch线程 HKr6h?Si^  
//等待子线程返回 &>!WhC16  
try{ tVf1]3(_>  
if(bFirst) LAoX'^6  
{ gXR1nnK  
nFileLength = getFileSize(); %mda=%Yn  
if(nFileLength == -1) x7s75  
{ $jDp ^ -  
System.err.println("File Length is not known!"); m>@$T x  
} CDz-IQi  
else if(nFileLength == -2) n-cz xq%n  
{ Xu1tN9:oE  
System.err.println("File is not access!"); h.\9a3B:r  
} f"0{e9O]2  
else o~Im5j],*  
{ mh4NZ @;  
for(int i=0;i<nStartPos.length;i++) #hBDOXHPf  
{ qP"<vZ  
nStartPos = (long)(i*(nFileLength/nStartPos.length)); *+E9@r=HF  
} D\:~G}M  
for(int i=0;i<nEndPos.length-1;i++) sf|[oD  
{ TV>UD q  
nEndPos = nStartPos[i+1]; 8^H <dR  
} *(~=L%s  
nEndPos[nEndPos.length-1] = nFileLength; uQ;b'6Jcp  
} <3!jra,h  
} A3UC=z<y  
iG[an*#X  
JvHGu&Nr!  
//启动子线程 y`~[R7E  
fileSplitterFetch = new FileSplitterFetch[nStartPos.length]; ((U-JeFW   
for(int i=0;i<nStartPos.length;i++) S> f8j?n  
{ sQT0y(FW  
fileSplitterFetch = new FileSplitterFetch(siteInfoBean.getSSiteURL(), T1@]:`&  
siteInfoBean.getSFilePath() + File.separator + siteInfoBean.getSFileName(), Hm?zMyO.k  
nStartPos,nEndPos,i); j HOE%  
Utility.log("Thread " + i + " , nStartPos = " + nStartPos + ", nEndPos = " + nEndPos); T/^ /U6JB  
fileSplitterFetch.start(); #_tixg  
} 2<aBUGA  
// fileSplitterFetch[nPos.length-1] = new FileSplitterFetch(siteInfoBean.getSSiteURL(), pvJsSX  
siteInfoBean.getSFilePath() + File.separator + siteInfoBean.getSFileName(),nPos[nPos.length-1],nFileLength,nPos.length-1); nKFua l3  
// Utility.log("Thread " + (nPos.length-1) + " , nStartPos = " + nPos[nPos.length-1] + ", m|O7@N  
nEndPos = " + nFileLength); 6 ]@H.8+  
// fileSplitterFetch[nPos.length-1].start(); .[-d( #l{l  
C^po*(W6  
?PIOuN=  
//等待子线程结束 K"cN`Kj<*-  
//int count = 0; <B;l).[6  
//是否结束while循环 r )cG ee  
boolean breakWhile = false; e1dT~l  
5o~;0K]  
Ksq{=q-T  
while(!bStop) dpO ZqhRs.  
{ T(<C8  
write_nPos(); G<C[A  
Utility.sleep(500); <Gy)|qpK[  
breakWhile = true; +oY[uF  
'm@0[i  
9HlRf6S  
for(int i=0;i<nStartPos.length;i++) r^ ?Qo  
{ ZJ} V>Bu-  
if(!fileSplitterFetch.bDownOver) hsVf/%  
{ pJ6Z/3]  
breakWhile = false; Qwn/ ,  
break; 7_WD)Y2yS  
} v1yNVs \}  
} IYq)p /  
if(breakWhile) 'IweN  
break; (u81p  
Tp.0@aC  
r00 fvZyK  
//count++; S x';Cj-  
//if(count>4) "-Lbz)k  
// siteStop(); W9~vBU  
} !3{> F"  
C>q,c3s5  
V:rq}F}  
System.err.println("文件下载结束!"); **V^8'W<  
} ">}l8MA  
catch(Exception e){e.printStackTrace ();} I| qoHN,g  
} dnVl;L8L3  
@, D 3$P8}  
)W!8,e+%  
//获得文件长度 8[SiIuIV  
public long getFileSize() [kx_Izi/T  
{ 2T &<jt  
int nFileLength = -1; `}ak;^Me  
try{ $srb!&~_>  
URL url = new URL(siteInfoBean.getSSiteURL()); LB_y lfg  
HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection (); k&4@$;Ap  
httpConnection.setRequestProperty("User-Agent","NetFox"); 3jIi$X06  
=dD<[Iz6  
?b0VB  
int responseCode=httpConnection.getResponseCode(); MR/jM@8  
if(responseCode>=400) (MiEXU~v  
{ j?ihUNY!+  
processErrorCode(responseCode); -b "7WBl  
return -2; //-2 represent access is error yjODa90!G  
} 7@u0;5p|  
=(ts~^  
OPR+K ?  
String sHeader; C`c;I7  
r>1M&Y=<  
[?mDTD8zU  
for(int i=1;;i++) Y,OSQBgk  
{ P g.PD,&U  
//DataInputStream in = new DataInputStream(httpConnection.getInputStream ()); 6LRI~*F=3  
//Utility.log(in.readLine()); m!3L/UZ  
sHeader=httpConnection.getHeaderFieldKey(i); V3fd]rIP  
if(sHeader!=null) EOu\7;kE9  
{ 6CBk,2DswI  
if(sHeader.equals("Content-Length")) L;=:OX 0  
{ & IVwm"  
nFileLength = Integer.parseInt(httpConnection.getHeaderField(sHeader)); $ Scb8<  
break; 7u]0dHj  
} ]q DhGt  
} aJlSIw*Q,  
else Be+CV">2  
break; $E@L{5Yt  
} |'WaBy1  
} +U9Gj#  
catch(IOException e){e.printStackTrace ();} DTrS9j?z  
catch(Exception e){e.printStackTrace ();} n*G[ZW*Uc  
S?Q4u!FC  
S+>1yvr),  
Utility.log(nFileLength); Bi9b"*LN  
w*`5b!+/  
|?6r&bT  
return nFileLength; il `O*6-  
} XQ&iV7   
%pmowo~{  
5inmFT?9Z  
//保存下载信息(文件指针位置) Q.H y"~  
private void write_nPos() nYG$V)iCb  
{ dg/OjiD[P  
try{ 0lR/6CB  
output = new DataOutputStream(new FileOutputStream(tmpFile)); !>T.*8  
output.writeInt(nStartPos.length); fyIL/7hzf4  
for(int i=0;i<nStartPos.length;i++) Xxcv 5.ug  
{ 3+_? /}<  
// output.writeLong(nPos); }R:eKj  
output.writeLong(fileSplitterFetch.nStartPos); ^& ZlV  
output.writeLong(fileSplitterFetch.nEndPos); ab8uY.j  
} *[jG^w0z8~  
output.close(); ]Ln2|$R  
} z"8%W?o>  
catch(IOException e){e.printStackTrace ();} WmTSxneo  
catch(Exception e){e.printStackTrace ();} rD)yEuYX  
} Dk4Jg++  
+HNY!fv9  
XYIZ^_My  
//读取保存的下载信息(文件指针位置) [8AGW7_  
private void read_nPos() sJ)XoK syW  
{ ''S*B|:  
try{ 4`5jq)  
DataInputStream input = new DataInputStream(new FileInputStream(tmpFile)); Jr m<u t  
int nCount = input.readInt(); AVyO5>w  
nStartPos = new long[nCount]; v;" [1w}  
nEndPos = new long[nCount]; vt}+d StUm  
for(int i=0;i<nStartPos.length;i++) 8qL*Nf  
{ Xk%92Pto  
nStartPos = input.readLong(); g#qt<d}j  
nEndPos = input.readLong(); #?.Yc%5B  
} yS0YWqv]6@  
input.close(); @O9.~6  
} N*w/\|  
catch(IOException e){e.printStackTrace ();} kFmd):U!R  
catch(Exception e){e.printStackTrace ();} %7 h _D  
} <CIJ g*  
s@sRdoTdF  
DK 4 8  
private void processErrorCode(int nErrorCode) h}fz`ti U  
{ _2+}_ >d  
System.err.println("Error Code : " + nErrorCode); & .VciSq6  
} o5KpiibFM  
XL>v$7`#  
x'_I{$C &  
//停止文件下载 %[0V>  
public void siteStop() |SC^H56+  
{ VE5w!of  
bStop = true; KCd}N  
for(int i=0;i<nStartPos.length;i++) [YG\a5QK  
fileSplitterFetch.splitterStop(); @ SaU2  
s7=CH   
V8ka*VJ(B  
} B9pro%R1Bo  
} j+AAhn  
//负责部分文件的抓取 n;8[WR)  
**FileSplitterFetch.java U<J4\|1?7'  
*/ fCTdM+t  
package NetFox; (&R /ns~  
HbQ `b  
'PRsZ`x.  
import java.io.*; R=P=?U.  
import java.net.*; Y`jvza%  
$j*%}x~[  
%Cbqi.iuQ  
public class FileSplitterFetch extends Thread { |k$^RU<OF  
FWI<_KZ O  
]s-;*o\H  
String sURL; //File URL x? 3U3\W  
long nStartPos; //File Snippet Start Position W1S7%6y_1  
long nEndPos; //File Snippet End Position 8P5yaS_  
int nThreadID; //Thread's ID Rhh5r0 \5  
boolean bDownOver = false; //Downing is over ||3%REliC  
boolean bStop = false; //Stop identical !'uL  
FileAccessI fileAccessI = null; //File Access interface V(Ll]g/T_;  
PjZsMHW%  
Ag=>F5  
public FileSplitterFetch(String sURL,String sName,long nStart,long nEnd,int id) throws IOException  ZaJg$  
{ mne4uW  
this.sURL = sURL; - y[nMEE  
this.nStartPos = nStart;  (c;F%m|  
this.nEndPos = nEnd; -Yx'qz@  
nThreadID = id; y<(q<V#0!S  
fileAccessI = new FileAccessI(sName,nStartPos);//定位 !gA<9h  
} *YmR7g|k  
sFv68Ag+  
Z18T<e  
public void run() nNJU@<|{*  
{ ?g gl8bzA  
while(nStartPos < nEndPos && !bStop) GlkTpX^b  
{ NrH2U Jm  
FJo  ?~  
8qGK"%{ ~  
try{ ("-Co,4ey  
URL url = new URL(sURL); ApHs`0=(  
HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection (); [4 L[.N@  
httpConnection.setRequestProperty("User-Agent","NetFox"); #DK@&Gv  
String sProperty = "bytes="+nStartPos+"-"; ^\=<geEj  
httpConnection.setRequestProperty("RANGE",sProperty); "8}p>gS  
Utility.log(sProperty); As0E'n85  
D^ZG-WR  
;hb;%<xqT  
InputStream input = httpConnection.getInputStream(); e;L++D  
//logResponseHead(httpConnection);  h>\T1PM  
\d$fi*{  
.l?sYe64S  
byte[] b = new byte[1024]; C+ar]Vi  
int nRead; " &2Kvsz  
while((nRead=input.read(b,0,1024)) > 0 && nStartPos < nEndPos && !bStop) "D#+:ix8G|  
{ 91%QO?hz  
nStartPos += fileAccessI.write(b,0,nRead); BSt^QH-'  
//if(nThreadID == 1) }jHS  
// Utility.log("nStartPos = " + nStartPos + ", nEndPos = " + nEndPos); ~I[Z 2&I  
} "TW%-67  
y#F`yXUj  
GaV6h|6_  
Utility.log("Thread " + nThreadID + " is over!"); Q@]~O-  
bDownOver = true; _8x:%$   
//nPos = fileAccessI.write (b,0,nRead); u^.7zL+  
} | 4/'~cYV  
catch(Exception e){e.printStackTrace ();}  `{w.OK  
} 52Sq;X  
} N$>.V7H&  
$yxwB/O(  
d%+oCoeb  
//打印回应的头信息 ,z<J`n  
public void logResponseHead(HttpURLConnection con) ipzv]c&  
{ \Ps}1)wT  
for(int i=1;;i++) cV]c/*z A  
{ J>_|hg=  
String header=con.getHeaderFieldKey(i); {wsO8LX  
if(header!=null) )CgKZ"  
//responseHeaders.put(header,httpConnection.getHeaderField(header)); @BQJKPF*  
Utility.log(header+" : "+con.getHeaderField(header)); x\( @ v  
else "#zSk=52z  
break; y!_*CYZ~m  
} S,ZlS<Z#  
} e4:,W+g,9  
s Dq{h  
7{jB!Xj  
public void splitterStop() 2to~=/.  
{ |2RoDW  
bStop = true; ~,#zdm1r@  
} l0Rjq*5hJ  
RcJ.=?I!  
a)L\+$@*  
} 581Jp'cje  
 TA;r  
."`mh&+`  
/* >]b>gc?3  
**FileAccess.java akR+QZ,)  
*//文件访问(定位,写) ])`+ 78  
package NetFox; x=-dv8N?  
import java.io.*; =NJ:%kvF  
#63)I9>  
\ a}6NIo  
public class FileAccessI implements Serializable{ 5e)2Jt:  
;B Lw?kf  
//RandomAccessFile类用于在任意一个文件的特定位置上读/写字节 GSlvT:k  
RandomAccessFile oSavedFile; [=3f:>ssm  
long nPos; /hrVnki*  
*[XVkt`H  
_#f+@)vR  
public FileAccessI() throws IOException `)i'1E[9  
{ 2=R}u-@6p  
this("",0); W=QT-4  
} S  ^5EG;[  
Ug}dw a  
Sr$&]R]^  
public FileAccessI(String sName,long nPos) throws IOException D,$!.5OA  
{ j%w}hGW%,  
oSavedFile = new RandomAccessFile(sName,"rw"); 6?B'3~ r  
this.nPos = nPos; K;uOtbdOK  
oSavedFile.seek(nPos); R0 yPmh,{  
} cXcrb4IKD  
pTzwyj!SD  
+=_^4  
public synchronized int write(byte[] b,int nStart,int nLen) TNi4H:\  
{ SynL%Y9)|,  
int n = -1; w_gFN%8  
try{ +-%&,>R  
oSavedFile.write(b,nStart,nLen); VIIBw  
n = nLen; YgiLfz iT  
} u/s,#  
catch(IOException e) "6^~-` O  
{ (w1M\yodV  
e.printStackTrace (); .~3s~y*s  
} ,Z3 (`ftC  
B7'rbc'  
>JSk/]"  
return n; NY(z 3G  
} 5Q/&,NP  
!UzMuGj  
8%+F.r  
} Wi;wu*  
)Bz2-|\  
/5**2Kgv1  
/* J&hzr t  
**SiteInfoBean.java a9f!f %9  
*/ AiF'*!1  
package NetFox; w(,K  
'R-Ly^:Qd  
UrC>n  
public class SiteInfoBean { N}|<P[LW  
g$^:2MT"aQ  
NA :_yA"  
private String sSiteURL; //Site's URL E*B6k!:  
private String sFilePath; //Saved File's Path H$@5\pP>  
private String sFileName; //Saved File's Name {fd/:B 7T  
private int nSplitter; //Count of Splited Downloading File 9~rrN60Q  
;nSOe AF)Q  
. X:  
public SiteInfoBean() \Fh#CI  
{//nSplitter的缺省值为5 bmid;X|  
//default value of nSplitter is 5 fen~k#|l  
this("","","",5);  AhyV  
} UnE[FYx  
},]G +L;R  
$.5f-vQp  
public SiteInfoBean(String sURL,String sPath,String sName,int nSpiltter) c4Leh"ry  
{ ~[N"Q|D3Y  
sSiteURL= sURL; B2kKEMdGg  
sFilePath = sPath; 1WP(=7$.  
sFileName = sName; ~dtS  
this.nSplitter = nSpiltter; n)<S5P?  
;h"St0   
B=<Z@u  
} hf`5NcnP  
VG=mA4Dd  
5 LX'fL7zU  
public String getSSiteURL() ~K 2.T7=  
{ TXWYQ~]3w  
return sSiteURL; mVs<XnA47  
} lSG"c+iV  
\jpm   
_\ &N<  
public void setSSiteURL(String value) .%"s| D  
{ 5R%4fzr&g  
sSiteURL = value; A &tMj?  
} G u4mP  
n OQvBc  
m>:zwz< ;  
public String getSFilePath() SDbR(oV  
{ Ovhd%qV;Y  
return sFilePath; ]ZI ?U<0  
} ^o8o  
e[($rsx  
AE@N:a  
public void setSFilePath(String value) ll^#I/  
{ 6rll0c~  
sFilePath = value; />dH\KvN  
} u}0U!  
H[DBL  
vU9j|z  
public String getSFileName() MXP3Z N'  
{ + FG Xx  
return sFileName; K;'s+ZD  
} *dpKo&y  
xm*6I  
<tn6=IV  
public void setSFileName(String value) n7p,{KSQ  
{ xgQ&'&7l  
sFileName = value; uLq%Nu  
} S2\|bs7;J,  
&_o.:SL|  
cYx.<b JH  
public int getNSplitter() @s % !R  
{ Q1 5h \!u  
return nSplitter; it)!-[:bm  
} )KbzgmLr  
Q~-MB]'  
RQ*oTsq  
public void setNSplitter(int nCount) w7e+~8|  
{ *%aWGAu:  
nSplitter = nCount; Z[GeU>?P  
} 5<77o|  
} &<Iz?AVr  
*Z}9S9YtN  
gNaB^IY  
/* 8r\;8all  
**Utility.java Y7GHIzX  
*/ @\?QZX(H  
package NetFox; "~,3gNTzV  
2S@aG%-)  
gw_]Y^U  
public class Utility { I=c}6  
!)//b]  
g&?RQ  
public Utility() "V>p  
{ J5#shs[M:  
"eH.<&  
P>wTp)  
} *V[6ta'  
*R_mvJlT  
//线程睡眠 5`A^"}0  
public static void sleep(int nSecond) 5-B %08T  
{ 48g`i  
try{ ;0JK>c ]#  
Thread.sleep(nSecond); e"^n^_9  
} `&/~%>  
catch(Exception e) Z9p`78kYyh  
{ *Hed^[sO  
e.printStackTrace (); ( SiwO.TZ  
} X775j"<d  
} i"GCm`  
9*CJWS;  
//日志 p;P cD  
public static void log(String sMsg) BW{&A&j  
{ Uy;e5<<  
System.err.println(sMsg); +2Wijrn  
} H^J waF  
-;RW)n^n  
z$b'y;k  
public static void log(int sMsg) )Q)H!yin  
{ b Sm*/Q  
System.err.println(sMsg); Cp!Qd e  
} 7 P/1'f3  
} b3^d!#KVM  
)D8V;g(7F  
<wj}y0(  
/* QQW]j;'~  
**TestMethod.java oeF0t'%  
*/ 1 R,?kUa  
package NetFox; Y8@TY?  
hNUkaP  
0oNy  
public class TestMethod { K['Gp>l  
nmy!.0SQ-  
dA[S@ysvG  
public TestMethod() ]`T*}$|  
{ ///xx/weblogic60b2_win.exe 5o2vj8::  
try{ hw)#TEt   
SiteInfoBean bean = new SiteInfoBean("http://localhost/xx/weblogic60b2_win.exe","L:\\temp","weblogic60b2_win.exe",5); ;pVnBi  
//SiteInfoBean bean = new SiteInfoBean("http://localhost:8080/down.zip","L:\\temp","weblogic60b2_win.exe",5); Y:KIaYkk  
SiteFileFetch fileFetch = new SiteFileFetch(bean); %C =?Xhnv  
fileFetch.start(); /PTk296@  
} . yN.  
catch(Exception e){e.printStackTrace ();} Xb\de_8!  
+xojnv  
7Ug^aA  
} dW} m44X  
tJ9-8ZT*  
x>eV$UJ  
public static void main(String[] args) +GFK!Pf  
{ ^M7pCetjdW  
new TestMethod(); Q'R*a(pm  
} K/IG6s;Xj  
}  zPW_  
点击下载更多相关资料
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
10+5=?,请输入中文答案:十五