[英]java telnet socket : BufferedReader / BufferedWriter
[英]Socket connection using BufferedReader / BufferedWriter
我的服務器沒有向客戶端發送帶有BufferedWriter
的響應。 似乎代碼停止在int amountOfNumbersToBeGenerated = Integer.parseInt(bufferedReader.readLine());
我相信客戶端上的bufferedreader.readline()
調用在某種意義上是引起和發出並阻塞了連接的。
import java.io.*;
import java.net.Socket;
import java.util.ArrayList;
public class ThreadedConnection implements Runnable {
private Socket connection;
private InputStream in;
private OutputStream out;
public ThreadedConnection(Socket connection) {
this.connection = connection;
try {
this.in = this.connection.getInputStream();
this.out = this.connection.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void run() {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(out));
try {
String lotteryType = bufferedReader.readLine(); //reads first line of input stream
int amountOfNumbersToBeGenerated = Integer.parseInt(bufferedReader.readLine());
System.out.println("3"+amountOfNumbersToBeGenerated);
switch (lotteryType) {
case "LuckyForLife":
generateLotteryNumbers(amountOfNumbersToBeGenerated, 48, 18, bufferedWriter);
break;
case "MegaMillions":
generateLotteryNumbers(amountOfNumbersToBeGenerated, 70, 25, bufferedWriter);
break;
case "PowerBall":
generateLotteryNumbers(amountOfNumbersToBeGenerated, 69, 26, bufferedWriter);
break;
default:
break;
}
bufferedWriter.flush();
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
connection.close();
bufferedReader.close();
bufferedWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void generateLotteryNumbers(int amountOfNumbersToBeGenerated, int upperLimitOfGeneratedNumbers, int upperLimitOfExtraNumber, BufferedWriter bufferedWriter){
RandomNumberGenerator randomNumbers = new RandomNumberGenerator(amountOfNumbersToBeGenerated,upperLimitOfGeneratedNumbers);
RandomNumberGenerator extraNumber = new RandomNumberGenerator(1,upperLimitOfExtraNumber);
ArrayList randomNumbersArrayList = randomNumbers.NumberGenerator();
ArrayList extraNumberArrayList = extraNumber.NumberGenerator();
String randomNumbersString = randomNumbersArrayList.toString();
randomNumbersString = randomNumbersString.substring(1, randomNumbersString.length()-1);
String extraNumberString = extraNumberArrayList.toString();
extraNumberString = extraNumberString.substring(1, extraNumberString.length()-1);
try {
bufferedWriter.write(randomNumbersString);
bufferedWriter.newLine();
bufferedWriter.write(extraNumberString);
bufferedWriter.newLine();
bufferedWriter.flush();
} catch (IOException e) {
e.printStackTrace();
}
// System.out.println(randomNumbersString);
// System.out.println(extraNumberString);
}
}
這是客戶端的代碼。 我認為第一個String gerneretedNumber = bufferedReader.readLine();
造成了問題。 當沒有任何內容從服務器寫出,然后弄亂服務器端的讀取時,幾乎就像調用讀取一樣。 如果我阻止了兩個readline()
調用,則服務器上的代碼可以工作,並且可以在控制台上打印出一些內容。
static void runClient(){
OutputStream outputStream;
InputStream inputStream;
Socket client;
BufferedWriter bufferedWriter;
BufferedReader bufferedReader;
try {
System.out.println("Creating client socket ");
client = new Socket("127.0.0.1", 5000);
outputStream = client.getOutputStream();
inputStream = client.getInputStream();
bufferedWriter = new BufferedWriter(new
OutputStreamWriter(outputStream));
//bufferedReader = new BufferedReader(new
InputStreamReader(System.in));
bufferedReader = new BufferedReader(new
InputStreamReader(inputStream));
bufferedWriter.write("LuckyForLife");
bufferedWriter.newLine();
bufferedWriter.write("5");
bufferedWriter.flush();
String generetedNumber = bufferedReader.readLine();
String extraNumber = bufferedReader.readLine();
System.out.println(gerneretedNumber);
System.out.println(extraNumber);
System.out.println("Guess its null");
bufferedReader.close();
bufferedWriter.close();
client.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
如果需要更多信息,我很樂意將其發布。
您的客戶永遠不會發送第二個換行符。 給定您的協議,客戶端不會半關閉(輸出關閉),因此服務器無法檢測到流的末尾。
順便說一句,嘗試在關閉套接字(tcp RST)之前關閉流(tcp FIN); 這更“合乎道德”! 順便說一句,tcp rst是一個殺手,未決字節可能不會被刷新掉(盡管您在這里有很多刷新,但這只是個好習慣)。
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