多线程的问题，请帮帮我
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
public class Alexa implements Runnable {

public ArrayList s = new ArrayList();

public static void main(String[] args) throws IOException {
Alexa alexa = new Alexa();
alexa.readFile( "c:\\sss.txt ");
Thread t = new Thread(alexa);
t.start();
}
public void run() {

String a = " ";
for (int i = 0; i < s.size(); i++) {
a = (String) s.get(i);
try {
saveBinaryFile(a);
System.out.println( "i= " + i);
System.out.println( "a= " + a);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

public void saveBinaryFile(String url1) throws IOException {

BufferedInputStream in = null;
OutputStream out = null;
try {

URL url = new URL(url1);
URLConnection conn = url.openConnection();

in = new BufferedInputStream(conn.getInputStream());

out = new FileOutputStream(new File( "c://tmp// "
+ System.currentTimeMillis()));
int n = 0;
byte[] bytes = new byte[1024];

while ((n = in.read(bytes)) != -1) {
out.write(bytes, 0, n);
}
} catch (Exception e) {
} finally {
try {
in.close();
out.close();
} catch (Exception ioe) {
ioe.getStackTrace();
}
}

}

public void readFile(String path) {
String fileline;
ArrayList domains = new ArrayList();
try {
BufferedReader d = new BufferedReader(new FileReader(path));

while ((fileline = d.readLine()) != null) {
domains.add(fileline);
System.out.println(fileline);
}

} catch (Exception e) {
System.out.println( "readFile.Error: " + e.getMessage() + " "
+ e.getClass());
e.printStackTrace();
} finally {
try {

} catch (Exception e) {

}
}
s = domains;
}

}
c:\\sss.txt 放了一些htm的连接，我想将这些页面下载下来，想用多线程，但是其中saveBinaryFile(a);不执行，但是
System.out.println( "i= " + i);
System.out.println( "a= " + a);却打印出来了，请问怎么回事？请指教，谢谢

[解决办法]
有什么错误信息啊？
[解决办法]
我试了你的代码

可以下载页面源代码

不知道你的不执行是什么状况


[解决办法]
你没把异常打出来看看吧：
c:\tmp\1175136790484 (系统找不到指定的路径。)

你的目录不存在！
加上下面代码：

File dir = new File( "c://tmp// ");
if (!dir.exists()){
dir.mkdirs();
}
在
out = new FileOutputStream(new File( "c://tmp// "+ System.currentTimeMillis()));
之前
[解决办法]
} catch (Exception e) {
} finally {}
这样只捕获异常不处理异常，你看不到异常状态的
[解决办法]
700多线程同时跑。。。。
不妨你试试线程池管理，每次同时跑10-20个先程就可以了：
ThreadPool thePool = new DefaultThreadPool(10);
thePool.invokeLater(
new Thread() {
public void run() {
.....
}
}

还有一种办法：
MultiThreadedHttpConnectionManager manager=new MultiThreadedHttpConnectionManager();
manager.getParams().setConnectionTimeout(20000);
manager.getParams().setSoTimeout(10000);
manager.getParams().setDefaultMaxConnectionsPerHost(20);
manager.getParams().setMaxTotalConnections(50);
HttpClient client = new HttpClient(manager);
String url= "...... ";
PostMethod postMethod = new PostMethod(url);
int statusCode = client.executeMethod(postMethod);
InputStream is = postMethod.getResponseBodyAsStream();
InputStreamReader isr = new InputStreamReader(is, "gb2312 ");
BufferedReader in = new BufferedReader(isr);
String inputLine = in.readLine();
StringBuffer resultBuffer = new StringBuffer();
while (inputLine != null) {
resultBuffer.append(inputLine);
resultBuffer.append( "\n ");

inputLine = in.readLine();
}

String result = resultBuffer.toString();
......