java通过tcp协议与qt通信

来源：互联网发布：mac下python开发环境编辑：程序博客网时间：2024/06/03 20:56

最近碰到一个项目，用qt写了一个服务器，java写客户端，然后客户端发送信息，请求服务器的数据。网上很多资料都是qt与qt通信，java与java通信，既然都是利用tcp协议，理论上也是可以进行java与qt的通信的，但是有许多细节需要注意。比如双方接收数据时都是使用byte数组类型，另外qt发送数据时不能把QString插入数据流中，这样java端接收的数据就是一个空串。以下是我简化的一段代码，java客户端发送一个数据（比如 0001），qt服务器端发回java客户端处理后的数据（0001 is ok ！）。代码如下：

qt服务器端

tcpserver.h

#ifndefTCPSERVER_H

#define TCPSERVER_H

#include <QTcpServer>

class TcpServer : public QTcpServer

    Q_OBJECT

public:

    explicit TcpServer(QObject *parent = 0, int port = 0);

signals:

private:

    void incomingConnection(int socketDescriptor);

public slots:

};

#endif // TCPSERVER_H

tcpserver.cpp

#include"tcpserver.h"

#include "tcpsocket.h"

#include <QDebug>

TcpServer::TcpServer(QObject *parent, int port) :

    QTcpServer(parent)

    if( !this->listen(QHostAddress::Any, port) ) {

    //if( !this->listen()) {

        qDebug() << "Server listen fail";

        exit(1);

    //port = this->serverPort();

    qDebug() << "Port: " << port;

    qDebug() << "Server listening......";

    //while(1);

void TcpServer::incomingConnection(int socketDescriptor)

    TcpSocket *socket = new TcpSocket(this);

    socket->setSocketDescriptor(socketDescriptor);

tcpsocket.h

#ifndefTCPSOCKET_H

#define TCPSOCKET_H

#include <QTcpSocket>

class TcpSocket : public QTcpSocket

    Q_OBJECT

public:

    explicit TcpSocket(QObject *parent = 0);

signals:

private:

    QString msg;

    void sendResponse();

private slots:

    void dataReceived();

};

#endif // TCPSOCKET_H

tcpsocket.cpp

#include"tcpsocket.h"

#include <QByteArray>

#include <QVariant>

#include <QDebug>

#include <QTime>

TcpSocket::TcpSocket(QObject *parent) :

    QTcpSocket(parent)

    connect(this,SIGNAL(readyRead()),this,SLOT(dataReceived()));

void TcpSocket::dataReceived()

    //qDebug() << "Hello data";

    QByteArray qdb = this->readAll();

    QString ss = QVariant(qdb).toString();

    this->msg = ss;

    //qDebug() << this->msg;

    QString curTime = QTime::currentTime().toString("hh:mm:ss");

    QString str = curTime + " :  " + this->msg + " tested";

    qDebug() << str;

    this->sendResponse();

void TcpSocket::sendResponse()

    QString response = this->msg + " is ok !";

    this->write(response.toStdString().c_str(),strlen(response.toStdString().c_str()));

    disconnectFromHost();

    waitForDisconnected();

main.cpp

#include<QApplication>

#include "tcpserver.h"

int main(int argc,char *argv[])

  QApplication a(argc,argv);

  int port = 8010;

  TcpServer *tcpServer = new TcpServer(0, port);

  return a.exec();

最后在pro文件中添加QT += network即可

此时，qt客户端程序已经写好，本人已经测试成功。

java客户端

SocketUtil.java

import java.io.DataOutputStream;
import java.io.DataInputStream;
import java.net.Socket;

public class SocketUtil {
   public static void main(String[] args) {
       //String str = null;
       Socket clientSocket;
       DataInputStream in = null;
       DataOutputStream out = null;

       try {
           clientSocket = new Socket("127.0.0.1",8010);
           in = new DataInputStream(clientSocket.getInputStream());
           out = new DataOutputStream(clientSocket.getOutputStream());
           //out.writeUTF("hello");
//           out.writeUTF("0001");
//           out.write("0001");
           //out.writeBytes("1000");
           //out.writeChars("0001");

           String temp=new String("0003");
            out.write(temp.getBytes("UTF-8"));

            System.out.println("Hello");
           byte[] by = new byte[1024];
            in.read(by);

            //System.out.println(by);
            String str1 = new String(by);
            System.out.println(str1);

            //System.out.println("End");
            in.close();
            out.close();


           /*
           while(true) {
               str = in.readUTF();
               //out.writeUTF(((int) (Math.random()*10) +1) + "");
               System.out.println("Client:" + str);
           }
           */

       }catch(Exception e) {
           e.printStackTrace();
       }


   }

}

至此，java客户端也已经写完。测试成功。

以下是运行结果：

java客户端：

qt服务器端：

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