Qt 实现重定义qDebug()日志系统，且用到线程锁，将所有输出类型进行重定义，工程可直接下载编译。

#include "logtextedit.h" LogTextEdit::LogTextEdit(QWidget *parent) { connect(MsgHandlerWapper::instance(), SIGNAL(message(QtMsgType,QMessageLogContext ,QString)), SLOT(outputMessage(QtMsgType,QMessageLogContext ,QString))); // setLogFileDevice(filepath); //如果自定义文件路径则不需要构造调用 } LogTextEdit::~LogTextEdit() { logFile.flush(); logFile.close(); gOutStream.flush(); } void LogTextEdit::outputMessage(QtMsgType type, const QMessageLogContext &context, const QString &msg) { QByteArray localMsg = msg.toLocal8Bit(); QString text; switch (type) { case QtDebugMsg: //组包数据 text = QString::fromLocal8Bit("Debug: %1 (%2:%3, %4)\n").arg(QString::fromLocal8Bit(localMsg.constData())).arg(context.file).arg(context.line).arg(context.function); break; case QtInfoMsg: text = QString::fromLocal8Bit("Info: %1 (%2:%3, %4)\n").arg(QString::fromLocal8Bit(localMsg.constData())).arg(context.file).arg(context.line).arg(context.function); break; case QtWarningMsg: text = QString::fromLocal8Bit("Warning: %1 (%2:%3, %4)\n").arg(QString::fromLocal8Bit(localMsg.constData())).arg(context.file).arg(context.line).arg(context.function); break; case QtCriticalMsg: text = QString::fromLocal8Bit("Critical: %1 (%2:%3, %4)\n").arg(QString::fromLocal8Bit(localMsg.constData())).arg(context.file).arg(context.line).arg(context.function); break; case QtFatalMsg: text = QString::fromLocal8Bit("Fatal: %1 (%2:%3, %4)\n").arg(QString::fromLocal8Bit(localMsg.constData())).arg(context.file).arg(context.line).arg(context.function); break; default: text = QString::fromLocal8Bit("Default: %1 (%2:%3, %4)\n").arg(QString::fromLocal8Bit(localMsg.constData())).arg(context.file).arg(context.line).arg(context.function); break; } //组包数据，将数据输出 gOutStream << QDateTime::currentDateTime().toString("[yyyy-MM-dd hh.mm.ss]\t") + text; //输出到txt文件 gOutStream .flush(); //刷新缓冲区 } void LogTextEdit::setLogFileDevice(const QString &filePath) { logFile.setFileName(filePath); if(!logFile.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append)) { return; } else { //设置文件输出流设备 gOutStream.setDevice(&logFile); } }