一.简介

1、简介

这是本人大二学期专业课程设计所设计的一个很简易的音乐播放器（功能有限，好多地方还有不足），如今大四即将毕业，难忘那时为了课程设计而苦学Qt的激情，心中不禁回忆满满，“大学才四年，疫情占三年”，希望同学们都能珍惜大学校园生活，珍惜青春。在此特将源码和课程设计报告书分享出来，供需要的同学参考。

2、界面部分截图

（1）从本地添加音乐界面：

（2）在线搜索界面：

（3）历史播放界面：

3、功能描述

实现的功能有：
（1）自定义背景图片
（2）在线搜索
（3）播放本地音乐
（4）播放历史
（5）基本播放控制功能
（6）数据库的记录

二.代码

1、工程目录

2、代码展示

（1）mainwidget.h代码：

#ifndef MAINWIDGET_H
#define MAINWIDGET_H#include <QWidget>
#include <QPainter>
#include<QMenu>
#include<QtMultimedia/QMediaPlayer>
#include<QtMultimedia/QMediaPlaylist>
#include<QListWidgetItem>
#include <QNetworkAccessManager>QT_BEGIN_NAMESPACE
namespace Ui { class mainWidget; }
QT_END_NAMESPACEclass mainWidget : public QWidget
{Q_OBJECTpublic:mainWidget(QWidget *parent = nullptr);~mainWidget();private slots:void on_btn_Title_clicked();void on_btn_About_clicked();void on_btn_Skin_clicked();void on_btn_Min_clicked();void on_btn_Close_clicked();void on_btn_CurrentMusic_clicked();void on_btn_LocalMusic_clicked();void on_btn_FavorMusic_clicked();void on_btn_Pre_clicked();void on_btn_play_clicked();void on_btn_Next_clicked();void on_btn_PlayMode_clicked();void on_btn_AddMusic_clicked();//添加音频文件void on_btn_Voice_clicked();void background_to_default();//切换到默认皮肤void background_setting();//切换到自定义皮肤void on_listWidget_localMusic_itemDoubleClicked(QListWidgetItem *item);//播放列表双击来播放音乐void onDurationChanged(qint64 duration); //文件时长变化，更新当前播放文件名显示；duration为播放文件数据总大小的信号， 它可以获得文件时间长度。void onPositionChanged(qint64 position); //当前文件播放位置变化，更新进度显示；position为播放到什么位置的信号， 参数是以毫秒来计算的。void on_PositionSlider_valueChanged(int value);void on_VolumeSlider_valueChanged(int value);void on_PositionSlider_sliderReleased();void initSearch();//初始化在线搜索void search();//在线搜索void on_tableWidget_cellDoubleClicked(int row, int column);//双击播放在线搜索中歌曲播放歌曲private:Ui::mainWidget *ui;QMenu *menu_changeSkin;     //更换皮肤的菜单QMediaPlayer * player;QMediaPlaylist * playlist;QString durationTime;QString positionTime;int M_Amount=0;//用来记录文件总数int M_Value=0;//当前播放的文件标记void init_Actions();//初始化菜单项void init_Settings();//初始化配置void init_Sql();//数据库初始化void insertSql(const QString& name);//存入数据库void read_fromSQL();//从数据中恢复本歌单void paintEvent(QPaintEvent *event) override;//绘制重写事件QNetworkAccessManager *NAM;//歌曲资源地址QUrl url;//歌手QString author;//歌曲名QString title;//时长qint64 duration;//唱片集QString albumTitle;//比特率int audioBitRate;
};
#endif // MAINWIDGET_H

（2）myQss.h代码：

#ifndef MYQSS_H
#define MYQSS_H
#include<QString>
#endif // MYQSS_H//该文件是一些控件的样式表
inline QString LoopStyle()
{return "QPushButton"
" {"
"background-image:url(:/image/image/loop.png);"
"   background-repeat:no-repeat;"
"  background-position:center center;"
"   border:none;""    }""QPushButton:hover{"
"  background-repeat:no-repeat;"
"   background-position:center center;"
"background-image:url(:/image/image-hover/loop-hover.png);"" }"
" QPushButton:pressed{"
"background-repeat:no-repeat;"
" background-position:center center;"
" background-image:url(:/image/image/loop.png);""}";
}inline QString LoopOneStyle()
{return "QPushButton"" {""background-image:url(:/image/image/loop-one.png);""   background-repeat:no-repeat;""  background-position:center center;""   border:none;""    }""QPushButton:hover{""  background-repeat:no-repeat;""   background-position:center center;""background-image:url(:/image/image-hover/loop-one-hover.png);"" }"" QPushButton:pressed{""background-repeat:no-repeat;"" background-position:center center;"" background-image:url(:/image/image/loop-one.png);""}";}inline QString RandomStyle()
{return "QPushButton"" {""background-image:url(:/image/image/play-random.png);""   background-repeat:no-repeat;""  background-position:center center;""   border:none;""    }""QPushButton:hover{""  background-repeat:no-repeat;""   background-position:center center;""background-image:url(:/image/image-hover/play-random-hover.png);"" }"" QPushButton:pressed{""background-repeat:no-repeat;"" background-position:center center;"" background-image:url(:/image/image/play-random.png);""}";}

（3）main.cpp代码:

#include "mainwidget.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);mainWidget w;w.show();return a.exec();
}

（4）mainwidget.cpp代码:

#include "mainwidget.h"
#include "ui_mainwidget.h"
#include <QStyleOption>
#include<QFileDialog>
#include <QMessageBox>
#include<QAction>
#include<QStandardPaths>
#include<QSettings>
#include<QDebug>
#include<QUrl>
#include"myQss.h"
#include<QNetworkReply>
#include <QNetworkRequest>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include<QTableWidgetItem>
#include <QEventLoop>
#include<QByteArray>
#include<QSqlDatabase>
#include<QSqlQuery>
#include<QtSql>mainWidget::mainWidget(QWidget *parent): QWidget(parent), ui(new Ui::mainWidget)
{ui->setupUi(this);this->setWindowTitle("小何音乐播放器");init_Actions();init_Settings();
}mainWidget::~mainWidget()
{delete ui;
}void mainWidget::init_Actions()//初始化
{//“换肤”的菜单项QAction *action_backgroud_to_default = new QAction(QIcon(":/image/image/image/default.png"),u8"更换到默认背景");connect(action_backgroud_to_default,&QAction::triggered,this,&mainWidget::background_to_default);QAction *action_backgroud_setting=new QAction(QIcon(":/image/image/image/setting.png"),u8"自定义背景");connect(action_backgroud_setting,&QAction::triggered,this,&mainWidget::background_setting);menu_changeSkin=new QMenu(this);menu_changeSkin->addAction(action_backgroud_to_default);menu_changeSkin->addAction(action_backgroud_setting);}void mainWidget::init_Settings()//初始化相关设置
{//1.皮肤初始化QSettings mysettings("./LightMusicPlayer.ini",QSettings::IniFormat);mysettings.setIniCodec("UTF8");QString fileName = mysettings.value("background/image-url").toString();QImage testImage(fileName);qDebug() << fileName;if(!fileName.isEmpty()&&!testImage.isNull()){setStyleSheet(QString("QWidget#mainWidget{""border-radius:10px;""border-image: url(%1);}").arg(fileName));}else{fileName=":/image/background/MenuSceneBg.png";QSettings mysettings("./LightMusicPlayer.ini",QSettings::IniFormat);mysettings.setIniCodec("UTF8");mysettings.setValue("background/image-url",fileName);setStyleSheet(QString("QWidget#mainWidget{""border-radius:10px;""border-image: url(%1);}").arg(fileName));}//2.ui中stackedwidget默认开启页面设置为1ui->stackedWidget->setCurrentIndex(1);//3.播放器初始化player = new QMediaPlayer(this);playlist = new QMediaPlaylist(this);playlist->setPlaybackMode(QMediaPlaylist::Loop);//设置循环模式player->setPlaylist(playlist);//获取将播放列表要播放的文件//4.进度条和歌曲时间显示变化connect(player,SIGNAL(positionChanged(qint64)),this,SLOT(onPositionChanged(qint64)));connect(player,SIGNAL(durationChanged(qint64)),this,SLOT(onDurationChanged(qint64)));//5.主界面音量滑动条默认显示为隐藏ui->VolumeSlider->hide();//6.窗口设置圆角后，会出现留白，需要添加以下代码setAttribute(Qt::WA_TranslucentBackground, true);//7.在线搜索//ui->lineEdit_page->setValidator(new QIntValidator(1,50));connect(ui->lineEdit,SIGNAL(returnPressed()),this,SLOT(initSearch()));//8.初始化数据库init_Sql();//9.read_fromSQL();//10}void mainWidget::init_Sql()//初始化数据库
{QSqlDatabase database;if (QSqlDatabase::contains("qt_sql_default_connection")){database = QSqlDatabase::database("qt_sql_default_connection");}else{database = QSqlDatabase::addDatabase("QSQLITE");database.setDatabaseName("Xiaohe.db");database.setUserName("Xiaohe");database.setPassword("Xiaohe");if (!database.open()){QMessageBox::critical(this,"无法打开数据库文件：Xiaohe.db",database.lastError().databaseText());exit(-1);}}//检查数据库是否存在,不存在则创建不存在的表QSqlQuery query;query.exec(QString("select count(*) from sqlite_master where type='table' and name='%1'").arg("MusicList"));//执行qsl语句if(query.next()){if(query.value(0).toInt()==0){QSqlQuery sql_query;QString create_sql = "create table Musiclist (name varchar(30))";sql_query.prepare(create_sql);sql_query.exec();}}
}void mainWidget::insertSql(const QString &name)//插入数据库
{QSqlQuery sql_query;QString insert_sql = "insert into Musiclist values (?)";sql_query.prepare(insert_sql);sql_query.addBindValue(name);//sql_query.exec();if(!sql_query.exec()){qDebug() << "插入失败: "<<sql_query.lastError();}else{qDebug() << "插入成功!";}
}void mainWidget::read_fromSQL()//从数据库中读取
{QSqlQuery sql_query;QString select_sql = "select *from Musiclist";sql_query.prepare(select_sql);qDebug()<<"读取成功1";if(sql_query.exec()){while(sql_query.next()){QString resource= (sql_query.value(0).toString());qDebug()<<"读取成功1后"<<resource;ui->listWidget_localMusic->addItem(resource);qDebug()<<"读取成功2";}}
}void mainWidget::paintEvent(QPaintEvent *event)//重写事件，为了是背景图在主界面显示
{QStyleOption opt;opt.init(this);QPainter p(this);style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);QWidget::paintEvent(event);
}void mainWidget::on_btn_Title_clicked()
{QMessageBox::about(this,"关于","小何播放器 | 一款精致小巧又清新的音乐播放器\n""著作人：小何同学\n""版本号：1.0\n""希望小何播放器能给您带来享受音乐的快乐\n");
}void mainWidget::on_btn_About_clicked()
{QMessageBox::about(this,"关于","小何播放器 | 一款精致小巧又清新的音乐播放器\n""著作人：小何同学\n""版本号：1.0\n""希望小何播放器能给您带来享受音乐的快乐\n");
}void mainWidget::on_btn_Skin_clicked()
{menu_changeSkin->exec(QCursor::pos());
}void mainWidget::on_btn_Min_clicked()
{showMinimized();
}void mainWidget::on_btn_Close_clicked()
{this->close();
}void mainWidget::on_btn_CurrentMusic_clicked()
{ui->stackedWidget->setCurrentIndex(0);
}void mainWidget::on_btn_LocalMusic_clicked()
{ui->stackedWidget->setCurrentIndex(1);
}void mainWidget::on_btn_FavorMusic_clicked()
{ui->stackedWidget->setCurrentIndex(2);
}void mainWidget::on_btn_Pre_clicked()
{if(M_Value == 0){M_Value =playlist->mediaCount()-1;}else{M_Value--;}QListWidgetItem *item = ui->listWidget_localMusic->item(M_Value);item->setSelected(true);player->stop();player->setMedia(QUrl::fromLocalFile(item->text()));if(player->state() == QMediaPlayer::StoppedState){ui->btn_play->setIcon(QIcon(":/image/image-hover/play-hover.png"));}player->play();ui->label_Position->setText(item->text());//显示歌曲信息ui->label_Motto->setText(item->text());//显示歌曲信息
}void mainWidget::on_btn_play_clicked()
{if(player->state() == QMediaPlayer::PlayingState){player->pause();ui->btn_play->setIcon(QIcon(":/image/image-hover/pase-hover.png"));}else if(player->state() == QMediaPlayer::PausedState){player->play();ui->btn_play->setIcon(QIcon(":/image/image-hover/play-hover.png"));}}void mainWidget::on_btn_Next_clicked()
{if(M_Value ==playlist->mediaCount()-1){M_Value =0;}else{M_Value++;}QListWidgetItem *item = ui->listWidget_localMusic->item(M_Value);item->setSelected(true);player->stop();player->setMedia(QUrl::fromLocalFile(item->text()));if(player->state() == QMediaPlayer::StoppedState){ui->btn_play->setIcon(QIcon(":/image/image-hover/play-hover.png"));}player->play();ui->label_Position->setText(item->text());//显示歌曲信息ui->label_Motto->setText(item->text());//显示歌曲信息
}void mainWidget::on_btn_PlayMode_clicked()
{QAction *random=new QAction(QIcon(":/image/image/random2.png"),"随机播放");QAction *itemloop=new QAction(QIcon(":/image/image/loop-one2.png"),"单曲循环");QAction *loop=new QAction(QIcon(":/image/image/loop2.png"),"循环播放");//随机播放
connect(random,&QAction::triggered,this,[=](){ui->btn_PlayMode->setStyleSheet(RandomStyle());ui->btn_PlayMode->setIcon(QIcon(":/image/image/play-random.png"));ui->btn_PlayMode->setToolTip(u8"随机播放");playlist->setPlaybackMode(QMediaPlaylist::Random);});//单曲循环
connect(itemloop,&QAction::triggered,this,[=](){qDebug()<<"ok1";ui->btn_PlayMode->setStyleSheet(LoopOneStyle());ui->btn_PlayMode->setIcon(QIcon(":/image/image/loop-one.png"));ui->btn_PlayMode->setToolTip(u8"单曲循环");playlist->setPlaybackMode(QMediaPlaylist::CurrentItemInLoop);});//循环播放
connect(loop,&QAction::triggered,this,[=](){ui->btn_PlayMode->setStyleSheet(LoopStyle());ui->btn_PlayMode->setIcon(QIcon(":/image/image/loop.png"));ui->btn_PlayMode->setToolTip(u8"循环播放");playlist->setPlaybackMode(QMediaPlaylist::Loop);});
QMenu *mode=new QMenu(this);
mode->addAction(random);
mode->addAction(itemloop);
mode->addAction(loop);
mode->exec(QCursor::pos());
}void mainWidget::on_btn_AddMusic_clicked()//添加本地音乐
{QString filter="音频文件(*.mp3 *.wav *.wma)mp3文件(*.mp3);;wav文件(*.wav);;wma文件(*.wma);;所有文件(*.*)";QStringList fileList = QFileDialog::getOpenFileNames(this,"选择音频文件","D:",filter);  for(auto i=0; i<fileList.count(); ++i){QString path=fileList.at(i);playlist->addMedia(QUrl::fromLocalFile(path));//QString fileName=path.split("/").last();ui->listWidget_localMusic->addItem(path);//insertSql(fileList.at(i));insertSql(path);}
}void mainWidget::on_btn_Voice_clicked()//调节音量
{if(ui->VolumeSlider->isHidden()){ui->VolumeSlider->show();}else{ui->VolumeSlider->hide();}
}void mainWidget::background_to_default()//默认背景
{QString fileName=":/image/background/MenuSceneBg.png";QSettings mysettings("./LightMusicPlayer.ini",QSettings::IniFormat);mysettings.setIniCodec("UTF8");mysettings.setValue("background/image-url",fileName);setStyleSheet(QString("QWidget#mainWidget{""border-radius:10px;""border-image: url(%1);}").arg(fileName));
}void mainWidget::background_setting()//设置背景
{//从默认图片位置打开文件选择框QString filter = "All file(*.*);;Text file(*.png);;Xml File(*.ipg)";QString fileName=QFileDialog::getOpenFileName(this,("选择自定义背景图片"),"/home/hezexi",filter);if(!fileName.isEmpty()){QImage testImage(fileName);if(!testImage.isNull()){QSettings mysettings("./LightMusicPlayer.ini",QSettings::IniFormat);mysettings.setIniCodec("UTF8");mysettings.setValue("background/image-url",fileName);setStyleSheet(QString("QWidget#mainWidget{""border-radius:10px;""border-image: url(%1);}").arg(fileName));}}
}void mainWidget::on_listWidget_localMusic_itemDoubleClicked(QListWidgetItem *item)//双击音乐以播放
{player->stop();player->setMedia(QUrl::fromLocalFile(item->text()));player->setVolume(50);player->play();ui->btn_play->setIcon(QIcon(":/image/image-hover/play-hover.png"));ui->label_Motto->setText(item->text());//显示歌曲信息M_Value = ui->listWidget_localMusic->row(item);ui->listWidget_HistorytMusic->addItem(item->text());
}void mainWidget::onDurationChanged(qint64 duration)
{ui->PositionSlider ->setMaximum(duration); //设置进度条最大值 也就是歌曲时长 msint secs = duration/1000; //全部秒数int mins = secs/60;//分secs = secs % 60;//秒durationTime = QString::asprintf("%d:%d",mins,secs);ui->label_Position->setText(positionTime+"/"+durationTime);}void mainWidget::onPositionChanged(qint64 position)
{if(ui->PositionSlider->isSliderDown())return;//如果手动调整进度条，则不处理ui->PositionSlider->setSliderPosition(position);int secs = position/1000;int mins = secs/60;secs = secs % 60;positionTime = QString::asprintf("%d:%d",mins,secs);ui->label_Position->setText(positionTime+"/"+durationTime);if(positionTime == durationTime){if(M_Value ==playlist->mediaCount()-1){M_Value =0;}else{M_Value++;}QListWidgetItem *item = ui->listWidget_localMusic->item(M_Value);item->setSelected(true);player->stop();player->setMedia(QUrl::fromLocalFile(item->text()));if(player->state() == QMediaPlayer::StoppedState || player->state() == QMediaPlayer::PausedState){ui->btn_play->setIcon(QIcon(":/image/image-hover/play-hover.png"));}player->play();ui->label_Position->setText(positionTime+"/"+durationTime);//显示歌曲信息ui->label_Motto->setText(item->text());//显示歌曲信息}}void mainWidget::on_PositionSlider_valueChanged(int value)
{//player->setPosition(value);
}void mainWidget::on_VolumeSlider_valueChanged(int value)//进度条声音调节
{player->setVolume(value);
}void mainWidget::on_PositionSlider_sliderReleased()//音乐进度条变化
{player->setPosition(ui->PositionSlider->value());
}void mainWidget::initSearch()
{//ui->lineEdit_page->setText(QString::number(1));search();
}void mainWidget::search()//在线搜索
{QString word = ui->lineEdit->text();NAM =new QNetworkAccessManager();if (word != "") {qDebug() << word;QString surl = "http://c.y.qq.com/soso/fcgi-bin/client_search_cp?t=0&aggr=1&lossless=1&cr=1&catZhida=1&format=json&p=1&n=40&w=" + word;qDebug() <<  surl;QUrl url = QString(surl);QNetworkRequest request(url);QNetworkReply *reply = reply= NAM->get(request);QEventLoop loop;connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));loop.exec();QByteArray BA = reply->readAll();qDebug() << BA;// 调试：写log/*QFile file("search.log");if (file.open(QFile::WriteOnly)) {file.write(QString(BA).toUtf8());file.close();}*/QJsonDocument json = QJsonDocument::fromJson(BA);QJsonArray list = json.object().value("data").toObject().value("song").toObject().value("list").toArray();ui->tableWidget->setRowCount(0);QStringList header;header<<"歌名"<<"歌手";ui->tableWidget->setHorizontalHeaderLabels(header);for (int i=0; i<list.size(); i++) {ui->tableWidget->insertRow(i);ui->tableWidget->setItem(i,0,new QTableWidgetItem(list[i].toObject().value("songname").toString()));ui->tableWidget->setItem(i,1,new QTableWidgetItem(list[i].toObject().value("singer").toArray()[0].toObject().value("name").toString()));ui->tableWidget->setItem(i,2,new QTableWidgetItem(list[i].toObject().value("songmid").toString()));ui->tableWidget->setItem(i,3,new QTableWidgetItem(list[i].toObject().value("albummid").toString()));}ui->tableWidget->resizeColumnsToContents();ui->tableWidget->scrollToTop();}
}void mainWidget::on_tableWidget_cellDoubleClicked(int row, int column)
{Q_UNUSED(column);ui->label_Motto->setText(ui->tableWidget->item(row,0)->text() + " - " + ui->tableWidget->item(row,1)->text());ui->listWidget_HistorytMusic->addItem(ui->tableWidget->item(row,0)->text() + " - " + ui->tableWidget->item(row,1)->text());QString songmid = ui->tableWidget->item(row,2)->text();QString surl = "https://u.y.qq.com/cgi-bin/musicu.fcg?-=getplaysongvkey2682247447678878&g_tk=5381&loginUin=956581739&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq.json&needNewCode=0&data={\"req_0\":{\"module\":\"vkey.GetVkeyServer\",\"method\":\"CgiGetVkey\",\"param\":{\"guid\":\"2796982635\",\"songmid\":[\"" + songmid + "\"],\"songtype\":[0],\"uin\":\"956581739\",\"loginflag\":1,\"platform\":\"20\"}},\"comm\":{\"uin\":956581739,\"format\":\"json\",\"ct\":24,\"cv\":0}}";QNetworkRequest request;request.setUrl(QUrl(surl));QNetworkReply *reply = NAM->get(request);QEventLoop loop;connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));loop.exec();QByteArray BA = reply->readAll();QJsonDocument JD = QJsonDocument::fromJson(BA);QString purl = JD.object().value("req_0").toObject().value("data").toObject().value("midurlinfo").toArray()[0].toObject().value("purl").toString();surl = "http://ws.stream.qqmusic.qq.com/" + purl;qDebug() << surl;player->stop();player->setMedia(QUrl(surl));player->play();ui->btn_play->setIcon(QIcon(":/image/image-hover/play-hover.png"));ui->PositionSlider->setMaximum(player->duration());}

（5）mainwidget.ui截图：

（6）.pro配置文件截图：

3、工程地址

（1）工程源码提取码：u2x9
（2）报告书部分页面截图：

报告书提取码9veq
（3）因为qt是跨平台的，因此在windows平台、linux平台下也可运行，但是可能也会因qt版本不同或者其他问题而造成运行失败问题。

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