java实现断点续传

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。






回页首




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。



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：

Java代码
/* 
**SiteFileFetch.java 
*/ 
import java.io.DataInputStream;  
import java.io.DataOutputStream;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.net.HttpURLConnection;  
import java.net.URL;  
 
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();  
    }  
} 

/*
**SiteFileFetch.java
*/
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

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();
}
}


Java代码
/* 
**FileSplitterFetch.java 
*/ 
import java.io.IOException;  
import java.io.InputStream;  
import java.io.RandomAccessFile;  
import java.io.Serializable;  
import java.net.HttpURLConnection;  
import java.net.URL;  
 
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;  
    }  
} 

/*
**FileSplitterFetch.java
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.io.Serializable;
import java.net.HttpURLConnection;
import java.net.URL;

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;
}
}


Java代码
/* 
**FileAccess.java 
*/ 
import java.io.*;  
 
public class FileAccessI implements Serializable {  
    /**  */ 
    private static final long serialVersionUID = 265981599353224785L;  
    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;  
    }  
} 

/*
**FileAccess.java
*/
import java.io.*;

public class FileAccessI implements Serializable {
/**  */
private static final long serialVersionUID = 265981599353224785L;
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;
}
}


Java代码
/* 
**SiteInfoBean.java 
*/ 
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;  
    }  
} 

/*
**SiteInfoBean.java
*/
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;
}
}


Java代码
/* 
**Utility.java 
*/ 
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);  
    }  
} 

/*
**Utility.java
*/
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);
}
}




Java代码
/* 
**TestMethod.java 
*/ 
 
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();  
    }  
}