org.apache.commons.net.io.Util使用InputStream，在流终止之前无法解析直播。这是正确还是不正确？
IOUtil课程对我来说是一个黑盒子。它使用org.apache.commons.net.io.Util，但同样不透明。
具体来说，Util.copyStream(remoteInput, localOutput);的{{1}}行很有趣：
IOUtil
如何读取原始流或其副本进入？实时telnet连接将具有copyStream
public static final long copyStream(InputStream source,
OutputStream dest)
throws CopyStreamException
Same as copyStream(source, dest, DEFAULT_COPY_BUFFER_SIZE);
Throws:
CopyStreamException
，但不会终止。我在API中看不到这样的功能。
或者，重新实现Apache InputStream可以回到最初的问题：
examples.util.IOUtil要么我有一个基本的误解，或者，如果没有重新实现（或者使用反射），这些API不允许处理实时，未终止的 package weathertelnet;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Logger;
public class StreamReader {
private final static Logger LOG = Logger.getLogger(StreamReader.class.getName());
private StringBuilder stringBuilder = new StringBuilder();
private InputStream inputStream;
public StreamReader() {
}
public void setInputStream(InputStream inputStream) throws IOException {
this.inputStream = inputStream;
readWrite();
}
public void readWrite() throws IOException {
Thread reader = new Thread() {
@Override
public void run() {
do {
try {
char ch = (char) inputStream.read();
stringBuilder.append(ch);
} catch (IOException ex) {
}
} while (true); //never stop reading the stream..
}
};
Thread writer = new Thread() {
@Override
public void run() {
//Util.copyStream(remoteInput, localOutput);
//somehow write the *live* stream to file *as* it comes in
//or, use org.apache.commons.net.io.Util to "get the data"
}
};
}
}
。
我真的不倾向于在这里使用反射，我认为下一阶段是要开始分解InputStream做什么以及它是如何做到的，但那真的是在兔子洞里。它在哪里结束？
答案 0 :(得分：1)
您可以复制流“ live ”但是当没有更多输入时，InputStream可能会阻止。
您可以看到org.apache.commons.net.io.Util#copyStream(...) here
答案 1 :(得分：0)
先输出：
thufir@dur:~$
thufir@dur:~$ java -jar NetBeansProjects/SSCCE/dist/SSCCE.jar
print..
makeString..
cannot remove java.util.NoSuchElementException
------------------------------------------------------------------------------
* Welcome to THE WEATHER UNDERGROUND telnet service! *
------------------------------------------------------------------------------
* *
* National Weather Service information provided by Alden Electronics, Inc. *
* and updated each minute as reports come in over our data feed. *
* *
* **Note: If you cannot get past this opening screen, you must use a *
* different version of the "telnet" program--some of the ones for IBM *
* compatible PC's have a bug that prevents proper connection. *
* *
* comments: jmasters@wunderground.com *
------------------------------------------------------------------------------
Press Return to continue:finally -- waiting for more data..
cannot remove java.util.NoSuchElementException
finally -- waiting for more data..
------------------------------------------------------------------------------
* Welcome to THE WEATHER UNDERGROUND telnet service! *
------------------------------------------------------------------------------
* *
* National Weather Service information provided by Alden Electronics, Inc. *
* and updated each minute as reports come in over our data feed. *
* *
* **Note: If you cannot get past this opening screen, you must use a *
* different version of the "telnet" program--some of the ones for IBM *
* compatible PC's have a bug that prevents proper connection. *
* *
* comments: jmasters@wunderground.com *
------------------------------------------------------------------------------
Press Return to continue:
cannot remove java.util.NoSuchElementException
^Cthufir@dur:~$
thufir@dur:~$
然后代码：
thufir@dur:~$ cat NetBeansProjects/SSCCE/src/weathertelnet/Telnet.java
package weathertelnet;
import static java.lang.System.out;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.logging.Logger;
import org.apache.commons.net.telnet.TelnetClient;
public final class Telnet {
private final static Logger LOG = Logger.getLogger(Telnet.class.getName());
private TelnetClient telnetClient = new TelnetClient();
public Telnet() throws SocketException, IOException {
InetAddress host = InetAddress.getByName("rainmaker.wunderground.com");
int port = 3000;
telnetClient.connect(host, port);
final InputStream inputStream = telnetClient.getInputStream();
final ConcurrentLinkedQueue<Character> clq = new ConcurrentLinkedQueue();
final StringBuilder sb = new StringBuilder();
Thread print = new Thread() {
@Override
public void run() {
out.println("print..");
try {
char ch = (char) inputStream.read();
while (255 > ch && ch >= 0) {
clq.add(ch);
out.print(ch);
ch = (char) inputStream.read();
}
} catch (IOException ex) {
out.println("cannot read inputStream:\t" + ex);
}
}
};
Thread makeString = new Thread() {
@Override
public void run() {
out.println("makeString..");
do {
try {
do {
char ch = clq.remove();
sb.append(ch);
// out.println("appended\t" + ch);
} while (true);
} catch (java.util.NoSuchElementException | ClassCastException e) {
out.println("cannot remove\t\t" + e);
try {
Thread.sleep(1000);
} catch (InterruptedException interruptedException) {
out.println("cannot sleep1\t\t" + interruptedException);
}
} finally {
out.println("finally -- waiting for more data..\n\n" + sb + "\n\n\n");
try {
Thread.sleep(1000);
} catch (InterruptedException interruptedException) {
out.println("cannot sleep1\t\t" + interruptedException);
}
}
} while (true);
}
};
print.start();
makeString.start();
}
private void cmd(String cmd) throws IOException {//haven't tested yet..
byte[] b = cmd.getBytes();
System.out.println("streamreader has\t\t" + cmd);
int l = b.length;
for (int i = 0; i < l; i++) {
telnetClient.sendCommand(b[i]);
}
}
public static void main(String[] args) throws SocketException, IOException {
new Telnet();
}
}thufir@dur:~$
thufir@dur:~$