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[英]How do I receive byte array sent from a server and read 4 single bytes at a time
[英]Is it possible to decode bytes on a server which were sent from a client as a byte array?
我只是想测试通过TCP套接字连接发送的字节,我知道这并不是真的,但是我只是想弄清楚这是否可行
我正在尝试做的是:
从客户端上的字符串获取字节
将其作为字节发送到服务器
获取服务器上的字节并将其解码回原始字符串
客户:
package ByteClientServer;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.*;
public class Client {
String hostAddress = "localhost";
int port = 1010;
public Client()
{
try {
Socket socket = new Socket(hostAddress, port);
String test = "hello"; //dycrypt bytes from this string on server side
byte[] byteArray = test.getBytes();
OutputStream out = socket.getOutputStream();
DataOutputStream dos = new DataOutputStream(out);
dos.write(byteArray);
}
catch (UnknownHostException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
public static void main(String[] args)
{
new Client();
}
}
服务器:
package ByteClientServer;
import java.io.*;
import java.net.*;
public class Server {
public static void main(String[] args)
{
try
{
ServerSocket server = new ServerSocket(1010);
server.setSoTimeout(0);
Socket connectionToClient = server.accept();
InputStream is = connectionToClient.getInputStream();
DataInputStream dis = new DataInputStream(is);
byte[] data = dis.readUTF().getBytes();
//dis.readFully(data, 0, data.length);
String s = new String(data);
System.out.println(s);
}
catch(IOException e)
{
e.printStackTrace();
//System.err.println("Server was terminated.");
}
}
}
它不喜欢服务器上的这一行:
byte [] data = dis.readUTF()。getBytes();
并抛出异常:
java.net.SocketException:连接重置在java.net.SocketInputStream.read(未知源)在java.net.SocketInputStream.read(未知源)在java.io.DataInputStream.readFully(未知源)在java.io.DataInputStream ByteClientServer.Server.main(Server.java:21)上的java.io.DataInputStream的.readUTF(未知源).readUTF(未知源)
如果要使用readUTF
则需要使用writeUTF
。 如果您只想写字节,则只需要读字节。
您正在使用默认编码写入字节,然后将其读取为UTF-8编码。 那就是问题。 这是John Skeets博客,解释了如何调试这些错误和一些陷阱
我想出了一个简单的解决方法
客户:
import java.io.*;
import java.net.*;
public class Client {
public static void main(String[] args)
{
String hostAddress = "localhost";
int port = 8080;
Socket socket = null;
String test = "hello"; //decode bytes from this string on the server
byte[] byteArray = test.getBytes();
try
{
socket = new Socket(hostAddress, port);
OutputStream out = socket.getOutputStream();
DataOutputStream dos = new DataOutputStream(out);
dos.write(byteArray, 0, byteArray.length);
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
服务器:
import java.io.*;
import java.net.*;
public class Server {
public static void main(String[] args) throws SocketException
{
try
{
ServerSocket server = new ServerSocket(8080);
server.setSoTimeout(0);
Socket connectionToClient = server.accept();
InputStream is = connectionToClient.getInputStream();
DataInputStream dis = new DataInputStream(is);
int buffersize = connectionToClient.getReceiveBufferSize();
byte[] bytes = new byte[buffersize];
if(dis.read(bytes) > 0)
{
String s = new String(bytes);
System.out.print(s);
}
dis.close();
server.close();
}
catch(IOException e)
{
e.printStackTrace();
System.err.println("Server was terminated.");
}
}
}
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