[英]How to read byte[] of variable size from DataInputStream in Java?
[英]Read byte arrays from DataInputStream
我有一个Java中的TCP Client
,可以与C# TCP Server
通信,反之亦然。 它们通过发送byte
数组进行通信。 我在读取客户端中的字节数组时遇到问题。 字节数组的固定长度为4。
例如,当服务器发送:
[2,4,0,2]
[2,4,0,0]
客户端输出为:
连接端口:10000
刚连接到/192.168.1.101:10000
服务器说[2,4,0,0]
我该如何解决? 似乎第一个数组被覆盖了吗?
TCPClient.java
public class TCPClient {
private OutputStream outToServer=null;
private DataOutputStream out=null;
private ByteProtocol byteProtocol;
Socket client;
InputStream inFromServer;
DataInputStream in;
public void initConnection(){
try {
int serverPort = 10000;
InetAddress host = InetAddress.getByName("192.168.1.101");
System.out.println("Connecting to port :" + serverPort);
client = new Socket(host, serverPort);
System.out.println("Just connected to " + client.getRemoteSocketAddress());
outToServer = client.getOutputStream();
out=new DataOutputStream(outToServer);
} catch (IOException e) {
e.printStackTrace();
}
}
public void readBytes(){
try {
inFromServer = client.getInputStream();
in = new DataInputStream(inFromServer);
byte[] buffer = new byte[4];
int read = 0;
while ((read = in.read(buffer, 0, buffer.length)) != -1) {
in.read(buffer);
System.out.println("Server says " + Arrays.toString(buffer));
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
public void sendBytes(byte [] byteArray) throws IOException{
out.write(byteArray);
}
public void closeClient() throws IOException{
client.close();
}
}
您好像两次读入缓冲区:
while ((read = in.read(buffer, 0, buffer.length)) != -1) {
in.read(buffer);
因此,在循环头中读取的内容将被第二个read()
覆盖。
while ((read = in.read(buffer, 0, buffer.length)) != -1) {
in.read(buffer);
System.out.println("Server says " + Arrays.toString(buffer));
}
您应该使用DataInputStream.readFully()
而不是此read()
构造,请参阅此相关问题 。 否则,您将无法确定是否已填满缓冲区。
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