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【提问】关于C++与java socket 通信的乱码问题（UDP）

C++ UDP 服务器端 utf-8编码，代码如下
#include <stdio.h>
#include <Winsock2.h>
void main()
//编码方式Utf-8
{
SOCKET socket1;
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL
{
printf("Winsock无法初始化!\n");
WSACleanup();
return;
}
struct sockaddr_in local;
struct sockaddr_in from;
int fromlen =sizeof(from);
local.sin_family=AF_INET;
local.sin_port=htons(27015); ///监听端口
local.sin_addr.s_addr=INADDR_ANY; ///本机
socket1=socket(AF_INET,SOCK_DGRAM,0);
bind(socket1,(struct sockaddr*)&local,sizeof(local));
while (1)
{
char buffer[1024]="\0";
printf("等待-------------\n");
if (recvfrom(socket1,buffer,sizeof(buffer),0,(struct sockaddr*)&from,&fromlen)!=SOCKET_ERROR)
{
printf("消息来自 %s--%s\n",inet_ntoa(from.sin_addr),buffer);
sendto(socket1,buffer,sizeof(buffer),0,(struct sockaddr*)&from,fromlen);
}
}
closesocket(socket1);
}


java代码如下，UDP 客户端 utf-8编码
package xj.ne;
/**
* UDP客户端 UTF-8编码
*/
import java.io.*;
import java.net.*;
public class UDPClient{
public static void main(String[] args)throws IOException{
DatagramSocket client = new DatagramSocket();
System.out.println("请输入内容");
BufferedReader wt = new BufferedReader(new InputStreamReader(System.in));
String sendStr = wt.readLine();
byte[] sendBuf;
sendBuf = sendStr.getBytes("UTF-8");
InetAddress addr = InetAddress.getByName("127.0.0.1");
int port = 27015;
DatagramPacket sendPacket
= new DatagramPacket(sendBuf ,sendBuf.length , addr , port);
client.send(sendPacket);
byte[] recvBuf = new byte[100];
DatagramPacket recvPacket
= new DatagramPacket(recvBuf , recvBuf.length);
client.receive(recvPacket);
String recvStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength());
System.out.println("收到:" + recvStr);
client.close();
}
}


2025-07-10 09:48:42
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C++出现乱码情况，


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