这里用的无线网：ipconfig查看下ip

QT之UDP通信_java

udpsend：

udpSend.cpp：

#include "udpSend.h"//#include <QUdpSocket>#include <QMessageBox>
udpSend::udpSend(QWidget *parent)  : QMainWindow(parent){  ui.setupUi(this);
  mSocket = new QUdpSocket();
 }void udpSend::on_sendBt_clicked() {       //单播      qint64 len = mSocket->writeDatagram(ui.textEdit->toPlainText().toUtf8(),QHostAddress("192.168.0.194"),8007);           //组播ip地址范围：224.0.0.0-239.255.255.255         //qint64 len = mSocket->writeDatagram(ui.textEdit->toPlainText().toUtf8(),QHostAddress("224.0.0.100"),6677);          //广播       //  qint64 len = mSocket->writeDatagram(ui.textEdit->toPlainText().toUtf8(), QHostAddress::Broadcast, 8007);  //QMessageBox::information(this, "Warning", ui.textEdit->toPlainText().toUtf8());  }

udpSend.h

#pragma once
#include <QtWidgets/QMainWindow>#include "ui_udpSend.h"#include <QUdpSocket>

class udpSend : public QMainWindow{  Q_OBJECT
public:  udpSend(QWidget *parent = Q_NULLPTR);
private:  Ui::udpSendClass ui;  QUdpSocket *mSocket;
private slots:  void on_sendBt_clicked();};

udpRecv：

udpRecv.cpp

#include "udpRecv.h"#include <QMessageBox>#if _MSC_VER >= 1600#pragma execution_character_set("utf-8")#endif
udpRecv::udpRecv(QWidget *parent)  : QMainWindow(parent){  ui.setupUi(this);   //创建对象 初始化    mSocket = new QUdpSocket();
    //绑定    mSocket->bind(QHostAddress::AnyIPv4,8007);  //QMessageBox::information(this, "Warning", QString(QHostAddress::AnyIPv4));//不会乱码    //关联读数据信号readyread    connect(mSocket,SIGNAL(readyRead()),this,SLOT(read_data())); }
 void udpRecv::read_data() {     QByteArray array;     QHostAddress address;     quint16 port;     array.resize(mSocket->bytesAvailable());//根据可读数据来设置空间大小     mSocket->readDatagram(array.data(),array.size(),&address,&port); //读取数据     ui.listWidget->addItem(array);//显示数据    //发送反馈数据  }  void udpRecv::on_checkBox_clicked(bool checked) {     if(checked)     {         //加入组播         mSocket->joinMulticastGroup(QHostAddress("224.0.0.100"));     }      else     {         //退出组播         mSocket->leaveMulticastGroup(QHostAddress("224.0.0.100"));      }  }

udpRecv.h：

#pragma once
#include <QtWidgets/QMainWindow>#include "ui_udpRecv.h"#include <QUdpSocket>
class udpRecv : public QMainWindow{  Q_OBJECT
public:  udpRecv(QWidget *parent = Q_NULLPTR);
private:  Ui::udpRecvClass ui;  QUdpSocket *mSocket;
 private slots:    void on_checkBox_clicked(bool);    void read_data();};

QT之UDP通信_java_02

测试结果：

QT之UDP通信_java_03