QT自制TCP服务器

TCP服务器

TCP服务器实现对TCP客户端的监听，实现对数据的发送与接收。

该TCP服务器入门级别，后面可以继续丰富。
界面

上图就是实现的界面，后面可以自己去丰富一下，上面的按钮，接收数据框，发送数据框，端口号输入框，文字显示等使用的控件为：

• 文字显示（除去按钮，按钮可以直接写）
  
  
• 端口号输入框
  和后面发送框一样的控件
  
  
• 按钮
  
  
• 发送框
  
  
• 接收框
  

注意：此控件设置为只读模式，因为不需要我们输入。
逻辑代码

.pro文件

1. QT       += core gui network//这个地方需要加上这个就可以了
3. greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
5. CONFIG += c++11
7. # The following define makes your compiler emit warnings if you use
8. # any Qt feature that has been marked deprecated (the exact warnings
9. # depend on your compiler). Please consult the documentation of the
10. # deprecated API in order to know how to port your code away from it.
11. DEFINES += QT_DEPRECATED_WARNINGS
13. # You can also make your code fail to compile if it uses deprecated APIs.
14. # In order to do so, uncomment the following line.
15. # You can also select to disable deprecated APIs only up to a certain version of Qt.
16. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
18. SOURCES += \
19.     main.cpp \
20.     widget.cpp
22. HEADERS += \
23.     widget.h
25. FORMS += \
26.     widget.ui
28. # Default rules for deployment.
29. qnx: target.path = /tmp/$${TARGET}/bin
30. else: unix:!android: target.path = /opt/$${TARGET}/bin
31. !isEmpty(target.path): INSTALLS += target

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.h文件

1. #ifndef WIDGET_H
2. #define WIDGET_H
4. #include <QWidget>
5. #include <QTcpServer>
6. #include <QTcpSocket>
7. #include <QHostAddress>
8. #include <QtNetwork>//需要的头文件
9. QT_BEGIN_NAMESPACE
10. namespace Ui { class Widget; }
11. QT_END_NAMESPACE
12. class Widget : public QWidget
13. {
14.     Q_OBJECT
15. public:
16.     Widget(QWidget *parent = nullptr);
17.     ~Widget();
18.     QTcpServer *tcpServer;
19.     QTcpSocket *tcpSocket;
20. private slots:
21.     void newConnection_Slot();
22.     void readyRead_Slot();
23.     void disconnected_Slot();
24.     void on_openbt_clicked();
25.     void on_closeBt_clicked();
26.     void on_sendBT_clicked();
27. private:
28.     Ui::Widget *ui;
29. };
30. #endif // WIDGET_H

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  此处添加头文件，声明槽函数。
  .cpp文件

1. #include "widget.h"
2. #include "ui_widget.h"
4. Widget::Widget(QWidget *parent)
5.     : QWidget(parent)
6.     , ui(new Ui::Widget)
7. {
8.     ui->setupUi(this);
9.     tcpServer = new QTcpServer(this);
10.     tcpSocket = new QTcpSocket(this);
11. //    tcpServer->listen(QHostAddress::LocalHost, ui->duankouEdit_2->text().toUInt());
12. //    connect(tcpServer, SIGNAL(newConnection()), this, SLOT(newConnection_Slot()));
13. }
14. void Widget::newConnection_Slot()
15. {
16.     static int i = 0;
17.     tcpSocket = tcpServer->nextPendingConnection();//创建socket连接
18.     connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readyRead_Slot()));//创建读数据凹槽
19.     connect(tcpSocket, SIGNAL(disconnected()), this, SLOT(disconnected_Slot()));//创建服务端失联凹槽
20.     i++;
21. }
22. void Widget::readyRead_Slot()
23. {
24.     QString buf;
25.     buf = tcpSocket->readAll();
26.     ui->receiveEdit->appendPlainText(buf);
27. }
28. void Widget::disconnected_Slot()
29. {
30. }
31. Widget::~Widget()
32. {
33.     delete ui;
34. }
35. void Widget::on_openbt_clicked()
36. {
37.     tcpServer->listen(QHostAddress::Any, ui->duankouEdit_2->text().toUInt());
38.     connect(tcpServer, SIGNAL(newConnection()), this, SLOT(newConnection_Slot()));
39.     QString localhostName = QHostInfo::localHostName();
40.     QHostInfo info = QHostInfo::fromName(localhostName);
41.     ui->receiveEdit->appendPlainText(localhostName);
42.     ui->receiveEdit->appendPlainText(info.addresses().back().toString());//first:ipv6地址，back:ipv4地址
43.     foreach(QHostAddress address,info.addresses())//寻找ipv4地址
44.     {
45.          if(address.protocol() == QAbstractSocket::IPv4Protocol)
46.             ui->receiveEdit->appendPlainText(address.toString());
47.     }
48.     quint16 port = tcpServer->serverPort();
49.     QString st = QString::number(port);
50.     ui->receiveEdit->appendPlainText(st);
51. }
52. void Widget::on_closeBt_clicked()
53. {
54.     tcpServer->close();
55.     tcpSocket->close();
56.     disconnect(tcpServer, SIGNAL(newConnection()), this, SLOT(newConnection_Slot()));
57. }
58. void Widget::on_sendBT_clicked()
59. {
60.      tcpSocket->write(ui->sendEdit->text().toLocal8Bit().data());
61. }

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打开服务器获取主机IP地址的两种方法：

1.         QHostInfo info = QHostInfo::fromName(localhostName);
2.     ui->receiveEdit->appendPlainText(localhostName);
3.     ui->receiveEdit->appendPlainText(info.addresses().back().toString());
4.     //first:ipv6地址，back:ipv4地址
5.     foreach(QHostAddress address,info.addresses())//寻找ipv4地址
6.     {
7.          if(address.protocol() == QAbstractSocket::IPv4Protocol)
8.             ui->receiveEdit->appendPlainText(address.toString());
9.     }
10.    

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项目展示

tcp服务器：

tcp客户端：
打开服务器的时候，服务器端会自动输出当前服务器的IP地址和端口号。
然后将IP地址和端口号输入到客户端里面，打开客户端连接就可以了。
实现了服务器与客户端的通信。
源码资源下载

https://download.csdn.net/download/qq_30255657/85675636

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