qt tcp/ip协议简单的用户图书管理系统（若有错误，请提醒，谢谢）

tcp协议的本身在百度还有别的什么资料上很多介绍我就不介绍。

我直接上代码 和一些简单的介绍了

首先数据肯定是要的 这个我就不说了 链接数据库网上一大把 ，如果不知道的，可以留言，我给你代码吧。（不要问我为啥不贴出来）

首先建立两个项目一个server端（也就是服务端） 一个是client（也就是客户端）（记得在pro里面加入 network，如果要用数据库也加上sql）

首先我们先去做server项目

这个是头文件 我基本上都标注了 不懂得话 可以留言 错误的 也可以 留言 

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QtNetwork>
#include <QTcpSocket>
#include <QTcpServer>
#include <QMainWindow>
#include "sql_library.h"//我自己的数据库
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
     void r();//接受客服端的信息 进行处理
private:
    Ui::MainWindow *ui;
    QTcpServer *tcpServer;//用于连接
    QTcpSocket *tcpClient;//用于数据发送
   int serverPort=6666;//du
    QString serverIP="127.0.0.1";
    QString clientMessage;
    QString serverMessage;
    QString message;
    quint16 blockSize;//存放文件大小的信息;
    QTcpSocket *clientConnection;
private slots:
    void serverSendMessage();//发送消息
    void serverReadMessage();//收获信息，阅读信息;
    void displayError(QAbstractSocket::SocketError);
    void screateServerSocket();
    void on_pushButton_clicked();
    void on_pushButton_2_clicked();
};
#endif // MAINWINDOW_H

cpp文件

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{  ui->setupUi(this);

     sql_library s;

     s.sql_connect();//数据库连接

    ui->pushButton_2->setEnabled(false);//发送消息的按钮不让其操作

     connect(ui->pushButton_2,SIGNAL(clicked()),this,SLOT(serverSendMessage()));

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::r()//信息处理处

{

    QDateTime dt;

    dt=QDateTime::currentDateTime();

    QString time=dt.toString("yyyy:MM:dd");

    sql_library s;//数据库的实例化

    QStringList t=message.split(",");

    if(!message.isEmpty())//处理客户端信息处

    {

        QString a;

        if(t[2]=="登陆")//登陆信息处理

        {

            if(s.sql_manageverify(t[0],t[1])==1)

            {

                serverMessage="登陆成功";

               a="用户:"+t[0]+"   "+"时间:"+time+"   "+"操作:"+t[2]+"   "+"状态:"+serverMessage;

               ui->textBrowser->insertPlainText (tr("%1\n").arg (a));

            }

            else if(s.sql_manageverify(t[0],t[1])==0)

            {

                 serverMessage="密码错误";

               a="用户:"+t[0]+"   "+"时间:"+time+"   "+"操作:"+t[2]+"   "+"状态:"+serverMessage;

               ui->textBrowser->insertPlainText (tr("%1\n").arg (a));

            }

             else

            {

                 serverMessage="不存在id";

                 a="用户:"+t[0]+"   "+"时间:"+time+"   "+"操作:"+t[2]+"   "+"状态:"+serverMessage;

                ui->textBrowser->insertPlainText (tr("%1\n").arg (a));

            }

        }

      else  if(t[2]=="用户查询")

        {

            QList<QStringList> t2=s.sql_selectuser(t[0],t[1]);

            serverMessage=s.QlisttoQString1(t2);

            a="时间:"+time+"   "+"操作:"+t[2]+"   "+"状态:"+serverMessage;

            ui->textBrowser->insertPlainText (tr("%1\n").arg (a));

            qDebug()<<serverMessage;

        }

        else  if(t[2]=="用户删除")

          {

              QString t0=t[0];

              QStringList t2=t0.split("#");

              qDebug()<<t2;

              QString t1=s.sql_deleteuser(t2);

              serverMessage=t1;

              a="时间:"+time+"   "+"操作:"+t[2]+"   "+"状态:"+t1;

              ui->textBrowser->insertPlainText (tr("%1\n").arg (a));

              qDebug()<<serverMessage;

          }

        else  if(t[2]=="用户修改")

          {

              QString t0=t[0];

              QStringList t2=t0.split("#");

              qDebug()<<t2;

              QString t1=s.sql_modifyuser(t2);

              serverMessage=t1;

              a="时间:"+time+"   "+"操作:"+t[2]+"   "+"状态:"+t1;

              ui->textBrowser->insertPlainText (tr("%1\n").arg (a));

              qDebug()<<serverMessage;

          }

        else  if(t[2]=="用户增添")

          {

              QString t0=t[0];

              QStringList t2=t0.split("#");

              qDebug()<<t2;

              QString t1=s.sql_insertuser(t2);

              serverMessage=t1;

              a="时间:"+time+"   "+"操作:"+t[2]+"   "+"状态:"+t1;

              ui->textBrowser->insertPlainText (tr("%1\n").arg (a));

              qDebug()<<serverMessage;

          }

    }

}

void MainWindow::serverReadMessage()

{

    QDataStream in(clientConnection);

    in.setVersion (QDataStream::Qt_4_7);

    if(blockSize == 0)

    {

        // 判断接收的数据是否有两字节，也就是文件的大小信息

        // 如果有则保存到 blockSize 变量中，没有则返回，继续接收数据

        if(clientConnection->bytesAvailable () < (int)sizeof(quint16))

            return ;

        in >> blockSize;

    }

    if(clientConnection->bytesAvailable () < blockSize)// 如果没有得到全部的数据，则返回，继续接收数据

        return;

    in >> message;

    qDebug()<<message;

   if(!message.isEmpty())

    ui->pushButton_2->clicked();

    ui->textBrowser->insertPlainText (tr("reveived message: %1 \n").arg (message));

    blockSize = 0;

}

//服务器端发送信息

void MainWindow::serverSendMessage ()

{

    if(!clientConnection) //判断有没有实例化

        if(!(clientConnection = tcpServer->nextPendingConnection ())) //没有客户端连接

        {

            return;

        }

    if(!serverMessage.isEmpty ())

    {

    QByteArray block;

    QDataStream out(&block, QIODevice::WriteOnly);

    out.setVersion (QDataStream::Qt_4_7);//设置版本

    out << (quint16) 0;

    out << serverMessage;

    out.device ()->seek (0);

    out << (quint16) (block.size () - sizeof(quint16));

    connect(clientConnection, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(displayErrorS(QAbstractSocket::SocketError)));

    clientConnection->write (block);

  }

}

void MainWindow::screateServerSocket ()

{

    clientConnection = tcpServer->nextPendingConnection ();

    blockSize = 0;//初始化

    connect (clientConnection, SIGNAL(disconnected()), clientConnection, SLOT(deleteLater()));//监测是否连接是否断开

    connect (clientConnection, SIGNAL(readyRead()), this, SLOT(serverReadMessage()));//监测是否有信息发过来，有，则进行处理现实

    qDebug()<<"链接成功";

}

 //服务器端错误提示

void MainWindow::displayError(QAbstractSocket::SocketError)//错误信息提示

{

  //  QMessageBox::warning (this, tr("Warnning"), clientConnection->errorString ());

    ui->textBrowser->insertPlainText (clientConnection->errorString ());

    connect (clientConnection, SIGNAL(disconnected()), clientConnection, SLOT(deleteLater()));

    clientConnection->disconnectFromHost ();

}

void MainWindow::on_pushButton_clicked()//打开服务器

{

                        //创建新的server；

    if(ui->pushButton->text()=="打开服务器")

        {

        tcpServer=new QTcpServer(this);

        if(!tcpServer->listen(QHostAddress::Any,6666))//准许链接的IP和端口

        {

            QMessageBox::warning(this,tr("Warnning"),tcpServer->errorString());

            close();

        }

     else

            qDebug()<<"可以连接。。。。。。";

        //connect(tcpServer,SIGNAL(newConnection()),this,SLOT(updateStatus()));//建立链接发生啥事

        connect(tcpServer,SIGNAL(newConnection()),this,SLOT(screateServerSocket()));//建立链接，创捷新的套接字

        ui->pushButton->setText("关闭服务器");

    }

    else

    {

        tcpServer->close();

         ui->pushButton->setText("打开服务器");

    }

}

void MainWindow::on_pushButton_2_clicked()//发送消息

{

    r();

}

下面是客服端的代码

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QtNetwork>

#include <QTcpSocket>

#include <QMainWindow>

#include <QTcpServer>

#include <QMessageBox>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

    void on_connect();//链接服务器;

    void tablewidget(int x,int y,QStringList c);//设置行数，列数,标题头

 private:

     Ui::MainWindow *ui;

     QTcpServer *tcpServer;

     QTcpSocket *tcpClient;

     int clientPort=6666;

     QString serverIP="127.0.0.1";//"115.159.189.90";

     QString clientMessage;

     QString message;

     quint16 blockSize;//存放文件大小的信息;

     QTcpSocket *clientConnection;

 private slots:

       void changeText(int rwo,int column);//获取checkbox信息

     void clientSendMessage();

     void updateStatus();

     void readMessage();

     void displayError(QAbstractSocket::SocketError);

     void createServerSocket();

     void updateClientStatusConnect();

     void updateClientStatusDisconnect();

     void on_pushButton_clicked();

     void on_pushButton_user_clicked();

     void on_tableWidget_clicked(const QModelIndex &index);

     void on_pushButton_search_clicked();

     void on_pushButton_delete_clicked();

     void on_pushButton_modify_clicked();

     void on_pushButton_insert_clicked();

};

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QDebug>

#include <QDateTime>

#include <QWidget>

int t[100];//储存check信息

int t1=0;//作为t数组的地址

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    ui->groupBox_2->hide();//隐藏操作界面

    ui->groupBox_3->hide();//隐藏操作界面

    on_connect();//链接服务器

    connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(clientSendMessage()));//登陆发送信息

    connect(ui->pushButton_user,SIGNAL(clicked()),this,SLOT(clientSendMessage()));//用户信息查询请求信息

     connect(ui->pushButton_search,SIGNAL(clicked()),this,SLOT(clientSendMessage()));//信息查询请求信息

      connect(ui->pushButton_delete,SIGNAL(clicked()),this,SLOT(clientSendMessage()));//信息删除请求信息

       connect(ui->pushButton_modify,SIGNAL(clicked()),this,SLOT(clientSendMessage()));//信息修改请求信息

       connect(ui->pushButton_insert,SIGNAL(clicked()),this,SLOT(clientSendMessage()));//信息增添请求信息

     connect(ui->tableWidget, SIGNAL(cellChanged(int,int)), this, SLOT(changeText(int,int)));//用cell函数获取checkbox的信息

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::tablewidget(int x, int y,QStringList c)//设置tablewidget

{

    //有bug 必须点击信息让其显示在line中才能去选checkbox；

    //或者把table click中的显示在line中 注释掉

    ui->tableWidget->setColumnCount(x);//列数

    ui->tableWidget->setRowCount(y);//行数

    ui->tableWidget->setHorizontalHeaderLabels(c);

     ui->tableWidget->setEditTriggers ( QAbstractItemView::NoEditTriggers );//表格不可编辑

    ui->tableWidget->setColumnWidth(0,ui->tableWidget->size ().width ()/20);

    for(int i=0;i<y;i++)

    {

        QTableWidgetItem *check=new QTableWidgetItem;

        check->setCheckState (Qt::Unchecked);

         ui->tableWidget->setItem(i,0,check); //插入复选框

    }

}

void MainWindow::changeText(int row,int colunm)

{

    if(ui->tableWidget->item(row, colunm)->checkState()==Qt::Checked) //选中

    {

        t[t1++]=row+1;

        qDebug()<<row;

    }

    else

    {

         for(int i=0;i<=t1;i++)

         {

             if(t[i]==row+1)

             {

                  t[i]=0;

             }

         }

    }

}

void MainWindow::on_connect()//链接服务器

{

    tcpClient=new QTcpSocket(this);//创建tcpsocket

    connect(tcpClient,SIGNAL(readyRead()),this,SLOT(readMessage()));//信息阅读

    connect(tcpClient,SIGNAL(error(QAbstractSocket::SocketError)),this,

            SLOT(displayError(QAbstractSocket::SocketError)));//错误信息提示

    connect(tcpClient,SIGNAL(connected()),this,SLOT(updateClientStatusConnect()));//链接后做的updatClientstatusconnect（）做的事

    connect(tcpClient,SIGNAL(disconnected()),this,SLOT(updateClientStatusDisconnect()));//断开连接做的事

            blockSize=0;

    tcpClient->abort();//刷新

    tcpClient->connectToHost(serverIP,clientPort);//链接

}

void MainWindow::clientSendMessage()//发送消息

{

    if(clientMessage.isEmpty())

    {

        //QMessageBox::warning(this,tr("Warnning"),tr("请输入发送的数据"));

        return;

    }

    QByteArray block;

    QDataStream out(&block,QIODevice::WriteOnly);

    out.setVersion(QDataStream::Qt_4_7);

    out<<(quint16)0;

    out<<clientMessage;

    out.device()->seek(0);

    out<<(quint16)(block.size()-sizeof(quint16));

    tcpClient->write(block);

     qDebug()<<block;//测试；

}

void MainWindow::displayError(QAbstractSocket::SocketError)

{

    QMessageBox::warning(this,tr("Warnning"),tcpClient->errorString());

    tcpClient->close();

}

void MainWindow::updateClientStatusConnect()//链接时给的测试

{

  qDebug()<<"已经链接到服务器了";

  //ui->label_4->setText("已连接");

}

void MainWindow::updateClientStatusDisconnect()//断开链接时给的测试

{

    qDebug()<<"已经断开服务器连接";

    //ui->label_4->setText("未连接");

    tcpClient->close();

}

void MainWindow::updateStatus()

{

}

void MainWindow::readMessage()//接受消息

{

    QDataStream in(tcpClient);

    int j=0,n=0;

    in.setVersion(QDataStream::Qt_4_7);

    if(blockSize==0)

    {

        if(tcpClient->bytesAvailable()<(int)sizeof(quint16))

            return;

        in>>blockSize;

    }

    if(tcpClient->bytesAvailable()<blockSize)

        return;

    in>>message;

    blockSize=0;

   /*、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、*/

    QStringList data1=clientMessage.split(",");

     QStringList data=message.split(",");

    if(!message.isEmpty()&&data1[2]=="登陆")//

    {

         if(message=="登陆成功")

         {

              qDebug()<<"登陆成功!";

             ui->groupBox->hide();  //隐藏登陆界面

             ui->groupBox_2->show(); //显示操作界面

         }

         else{

            qDebug()<<"登陆失败";

             //QMessageBox::warning(this,tr("Warnning"),tr("登陆失败"));

            }

    }

    else if(!message.isEmpty()&&data1[2]=="用户查询")//

    {

         int j=0,n=0;

         QStringList c;

         c<<"选择"<<"编号"<<"姓名"<<"余额"<<"总借书本数"<<"已借书本书"<<"学院"<<"专业";

         tablewidget(8,data.length()/7,c);

        for(int i=0;i<data.length()/7;i++)

        {

               ui->tableWidget->setItem(i,j+1,new QTableWidgetItem(data[n])); n+=1;

               ui->tableWidget->setItem(i,j+2,new QTableWidgetItem(data[n])); n+=1;

               ui->tableWidget->setItem(i,j+3,new QTableWidgetItem(data[n])); n+=1;

               ui->tableWidget->setItem(i,j+4,new QTableWidgetItem(data[n])); n+=1;

               ui->tableWidget->setItem(i,j+5,new QTableWidgetItem(data[n])); n+=1;

               ui->tableWidget->setItem(i,j+6,new QTableWidgetItem(data[n])); n+=1;

               ui->tableWidget->setItem(i,j+7,new QTableWidgetItem(data[n])); n+=1;

        }

    }

    else if(!message.isEmpty()&&data1[2]=="用户删除")//

    {

         qDebug()<<message;

         on_pushButton_user_clicked();

    }

    else if(!message.isEmpty()&&data1[2]=="用户修改")//

    {

         qDebug()<<message;

         on_pushButton_user_clicked();

    }

}

void MainWindow::createServerSocket()

{

    clientConnection=tcpServer->nextPendingConnection();

    connect(clientConnection,SIGNAL(disconnected()),clientConnection,SLOT(deleteLater()));

}

void MainWindow::on_pushButton_clicked()//登陆

{

    if(ui->lineEdit->text()==""||ui->lineEdit_2->text()=="")

    {

        qDebug()<<"不能为空!";

      QMessageBox::warning(this,tr("警告！"),tr("id和密码不能为空!"));

    }

    else

    {

        QDateTime dt;

        dt=QDateTime::currentDateTime();

        QString time=dt.toString("yyyy:MM:dd");

        clientMessage=ui->lineEdit->text()+","+ui->lineEdit_2->text()+","+"登陆"+","+time;//账号，密码，登陆，时间

    }

}

void MainWindow::on_pushButton_user_clicked()//用户信息管理

{

    ui->tableWidget->clear();

    ui->groupBox_2->setTitle("用户信息管理");

    ui->groupBox_3->show();

    QDateTime dt;

    dt=QDateTime::currentDateTime();

    QString time=dt.toString("yyyy:MM:dd");

    QString s=NULL;

    clientMessage=s+","+s+","+"用户查询"+","+time;//用户查询

}

void MainWindow::on_tableWidget_clicked(const QModelIndex &index)

{

    int row=ui->tableWidget->currentRow();//获取当前得行数；

    ui->lineEdit_3->setText(ui->tableWidget->item(row,1)->text());//信息显示

    ui->lineEdit_4->setText(ui->tableWidget->item(row,2)->text());

    ui->lineEdit_5->setText(ui->tableWidget->item(row,3)->text());//信息显示

    ui->lineEdit_6->setText(ui->tableWidget->item(row,4)->text());

    ui->lineEdit_7->setText(ui->tableWidget->item(row,5)->text());//信息显示

}

void MainWindow::on_pushButton_search_clicked()//查询操作

{

      ui->tableWidget->clear();

    if(ui->groupBox_2->title()=="用户信息管理")

    {

        QDateTime dt;

        dt=QDateTime::currentDateTime();

        QString time=dt.toString("yyyy:MM:dd");

        clientMessage=ui->lineEdit_3->text()+","+ui->lineEdit_4->text()+","+"用户查询"+","+time;//用户查询

    }

}

void MainWindow::on_pushButton_delete_clicked()//信息删除

{

    QDateTime dt;

    dt=QDateTime::currentDateTime();

    QString time=dt.toString("yyyy:MM:dd");

    if(ui->groupBox_2->title()=="用户信息管理")

    {

        QString s=NULL;

        qDebug()<<t1;

        for(int i=0;i<t1;i++)

        {

            if(t[i]!=0)

            {

                s+="#"+ui->tableWidget->item((t[i]-1),1)->text();

                 qDebug()<<s;

            }

        }

       qDebug()<<s;

       if(t1==0)

        {

            QMessageBox::warning(this,tr("警告！"),tr("删除信息不能空!"));

            return;

        }

        else{

            clientMessage=s+","+" "+","+"用户删除"+","+time;//用户删除

        }

    }

    //ui->tableWidget->clear();

}

void MainWindow::on_pushButton_modify_clicked()//修改

{

    QDateTime dt;

    dt=QDateTime::currentDateTime();

    QString time=dt.toString("yyyy:MM:dd");

    if(ui->groupBox_2->title()=="用户信息管理")

    {

        //ui->lineEdit_3->setReadOnly(true);

        if(ui->lineEdit_3->text().isEmpty())

        {

            QMessageBox::warning(this,tr("警告！"),tr("修改信息不能空!"));

        }

        else

        {

            QString s=ui->lineEdit_3->text()+"#"+ui->lineEdit_4->text()+"#"+ui->lineEdit_5->text()+"#"+ui->lineEdit_6->text()+"#"+ui->lineEdit_7->text();

             clientMessage=s+","+" "+","+"用户修改"+","+time;//用户修改

        }

    }

}

void MainWindow::on_pushButton_insert_clicked()//增添

{

    QDateTime dt;

    dt=QDateTime::currentDateTime();

    QString time=dt.toString("yyyy:MM:dd");

    if(ui->groupBox_2->title()=="用户信息管理")

    {

        //ui->lineEdit_3->setReadOnly(true);

        if(ui->lineEdit_3->text().isEmpty())

        {

            QMessageBox::warning(this,tr("警告！"),tr("增添信息不能空!"));

        }

        else

        {

            QString s=ui->lineEdit_3->text()+"#"+ui->lineEdit_4->text()+"#"+ui->lineEdit_5->text()+"#"+ui->lineEdit_6->text()+"#"+ui->lineEdit_7->text();

             clientMessage=s+","+" "+","+"用户增添"+","+time;//用户增添

        }

    }

}

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