我开始使用java套接字并且输出奇怪[缺少]。这是我的套接字方法的来源:
客户端源代码:
public void loginToServer(String host, String usnm ) {
try {
Socket testClient = new Socket(host,1042);
System.out.println ("Connected to host at " + host);
logString = ("CONNECTED: " + host);
outGoing = new PrintWriter(testClient.getOutputStream(), true);
outGoing.print("Hello from " + testClient.getLocalSocketAddress());
InputStream inFromServer = testClient.getInputStream();
DataInputStream in = new DataInputStream(inFromServer);
System.out.println("Server says " + in.readLine());
testClient.close();
}
catch (Exception e) {
System.err.println ("Error connecting to host at " + host + ":1042.\n Reason: " + e);
logString = ("CONNECT FAILED: " + host + ":1042: " + e);
}
printLog(logString);
// send server usnm and os.name [System.getProperty(os.name)] ?
}
服务器代码:
public void runServer() {
try{
server = new ServerSocket(1042);
}
catch (IOException e) {
printLog("LISTEN FAIL on 1042: " + e);
System.err.println("Could not listen on port 1042.");
System.exit(-1);
}
try{
client = server.accept();
}
catch (IOException e) {
printLog("ACCEPT FAIL on 1042: " + e);
System.err.println("Accept failed: 1042");
System.exit(-1);
}
try{
inComing = new BufferedReader(new InputStreamReader(client.getInputStream()));
outGoing = new PrintWriter(client.getOutputStream(), true);
}
catch (IOException e) {
printLog("READ FAIL on 1042: " + e);
System.err.println("Read failed");
System.exit(-1);
}
while(true){
try{
clientData = inComing.readLine();
//processingUnit(clientData, client);
outGoing.print("Thank you for connecting to " + server.getLocalSocketAddress() + "\nGoodbye!");
}
catch (IOException e) {
printLog("READ FAIL on 1042: " + e);
System.out.println("Read failed");
System.exit(-1);
}
}
}
客户提供的输出仅为Connected to host at localhost
。
发生了什么事?
答案 0 :(得分:2)
您正在撰写文字和阅读二进制文件。由于您的输出和输入不匹配,因此很可能会挂起。
我建议您使用带有writeUTF / readUTF的二进制文件或带有println / readLine的文本。
BTW:readUTF读取两个字节以确定要读取的数据长度。由于前两个字节是ASCII文本,因此在返回之前可能会等待大约16,000个字符。
答案 1 :(得分:2)
您正在阅读线路,但您没有发送线路。将print()
更改为println()
。 readLine()
将永远阻止等待换行符。它将在流的末尾返回null,即当对等体关闭连接时,但你没有检查它,所以你无限期地循环。