英文:
Conversion of unreadable string from TCP IP port in java
问题
以下是您要求的翻译部分：
我正在尝试使用Java Socket编程ServerSocket从系统的TCP IP端口读取连续数据，但我得到的是像下面这张图片中一样的无法读取的字符串数据：
（图片链接）
1: https://i.stack.imgur.com/3i5kY.png
我正在使用以下代码从TCP IP端口读取数据：
ServerSocket server_socket;
BufferedReader input;
try {
server_socket = new ServerSocket(6666);
LOGGER.info("Server waiting for client on port "
+ server_socket.getLocalPort());
System.out.println("Server waiting for client on port "
+ server_socket.getLocalPort());
while (true) {
Socket socket = server_socket.accept();
input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
try {
while (true) {
String message = input.readLine();
if (message == null) {
break;
}
}
} catch (Exception e) {
socket.close();
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
因此，请告诉我上面图片中是什么类型的数据，我应该进行什么样的转换？
提前谢谢。
英文:
I am trying to read continuous data from TCP IP port of system using Java Socket Programming ServerSocket but I am getting unreadable string data like in following following image :
I am using following code for read data from TCP IP port :
ServerSocket server_socket;
BufferedReader input;
try {
server_socket = new ServerSocket(6666);
LOGGER.info("Server waiting for client on port "
+ server_socket.getLocalPort());
System.out.println("Server waiting for client on port "
+ server_socket.getLocalPort());
while (true) {
Socket socket = server_socket.accept();
input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
try {
while (true) {
String message = input.readLine();
if (message == null) {
break;
}
}
} catch (Exception e) {
socket.close();
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
So please let me know what kind of data are in above image and what conversion I should do?
Thanks in advance.
答案1
得分: 0
一处缺陷：
InputStreamReader 负责将二进制数据（InputStream）转换为读取器（（Unicode）文本）。为此，您可以并且应该指定一个文本编码，即 Charset。您正在使用默认的平台编码。
input = new BufferedReader(
new InputStreamReader(socket.getInputStream(), StandardCharsets.ISO_8859_1));
您现在可以通过 telnet 或其他终端工具访问此服务器应用程序。甚至可以通过 http://localhost:6666/ （telnet://localhost:6666/？）在浏览器中访问。
您所看到的内容似乎是非文本二进制数据 - 默认编码是否不是中文或类似的。
此外，通过从线程池中获取一个新线程来处理来自 accept 的 socket，可以改进代码。
应注意发送的头行（您未输出）以及之后的接收。
英文:
One flaw:
The InputStreamReader is responsible for converting binary data (an InputStream) to a Reader ((Unicode) text). For that you can & should specify a text encoding, a Charset. You are using the default, platform encoding.
input = new BufferedReader(
new InputStreamReader(socket.getInputStream(), StandardCharsets.ISO_8859_1));
You can now access this server application yourself by telnet or an other terminal tool. Or even the browser by http://localhost:6666/ (telnet://localhost:6666/?).
What you are seeing does look like non-text binary data - should the default encoding not be Chinese or such.
Furthermore the code would be improved by a new thread from a thread pool handling the socket from the accept.
One should pay attention to the header lines one sends (you do not output) and then receive.
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