Java - 从套接字读取？
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Java - Read from socket?
提问by user207421
SO I just tried to read text from a socket, and I did the following:
所以我只是试图从套接字读取文本，我做了以下事情：
import java.io.*;
import java.net.*;
public class apples{
public static void main(String args[]) throws IOException{
Socket client = null;
PrintWriter output = null;
BufferedReader in = null;
try {
client = new Socket("127.0.0.1", 2235);
output = new PrintWriter(client.getOutputStream(), false);
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
while (true) {
System.out.println("Line: " + client.getOutputStream());
}
}
catch (IOException e) {
System.out.println(e);
}
output.close();
in.close();
client.close();
}
}
This prints out weird numbers and stuff like:
这会打印出奇怪的数字和类似的东西：
java.net.SocketOutputStream@316f673e
I'm not really sure of all the Java functions and things, so how would I make the output print out as text?
我不太确定所有的 Java 函数和东西，那么我如何将输出打印为文本呢？
回答by galchen
look at:
看着：
while (true) {
System.out.println("Line: " + client.getOutputStream());
}
getOutputSteam() returns an object that represents a stream. you can use this object to send data through the stream. here's an example:
getOutputSteam() 返回一个表示流的对象。您可以使用此对象通过流发送数据。这是一个例子：
BufferedOutputStream out = new BufferedOutputStream(this._socket.getOutputStream());
out.write("hello");
out.flush();
this will send the message "hello" through the socket
这将通过套接字发送消息“hello”
to read the data, you will use the inputstream instead
要读取数据，您将改用输入流
let me just point out - this is a client that you are creating. You also need to create a server. Use java's ServerSocket class for creating a server
让我指出 - 这是您正在创建的客户端。您还需要创建一个服务器。使用 java 的 ServerSocket 类来创建服务器
EDIT: you want to write a client/server application in java. you need to implement 2 processes: a client and a server. the server will listen on some port (using ServerSocket). the client will connect to that port, and send a message.
编辑：您想用 java 编写客户端/服务器应用程序。您需要实现 2 个进程：客户端和服务器。服务器将侦听某个端口（使用 ServerSocket）。客户端将连接到该端口，并发送一条消息。
first object you need to understand is ServerSocket. Server code:
您需要了解的第一个对象是 ServerSocket。服务器代码：
ServerSocket s = new ServerSocket(61616); // this will open port 61616 for listening
Socket incomingSocket = s.accept(); // this will accept new connections
s.accept method is blocking - it waits for incoming connections, and goes to the next line only after a connection has been accepted. it creates a Socket object. for this socket object you will set up an input stream and output stream (to send/receive data).
s.accept 方法是阻塞的——它等待传入的连接，并且只有在连接被接受后才转到下一行。它创建一个 Socket 对象。对于此套接字对象，您将设置输入流和输出流（以发送/接收数据）。
on the client:
在客户端：
Socket s = new Socket(serverIp, serverPort);
this will open a socket to the server. ip in your case will be "127.0.0.1" or "localhost" (local machine), and port will be 61616.
这将打开一个到服务器的套接字。在您的情况下，ip 将是“127.0.0.1”或“localhost”（本地机器），端口将是 61616。
you will again, set up input/output stream, to send/receive messages
您将再次设置输入/输出流，以发送/接收消息
if you are connecting to a server that already exists, you only need to implement the client of course
如果你连接到一个已经存在的服务器，你当然只需要实现客户端
you can find many examples online
你可以在网上找到很多例子
回答by user207421
You aren't reading anythingwith this code:
您没有使用此代码阅读任何内容：
while (true) {
System.out.println("Line: " + client.getOutputStream());
}
should be:
应该：
String line;
while ((line = in.readLine()) != null) {
System.out.println("Line: " + line);
}
