目录
背景
演示
搭建Java Web环境
QTcpSocket获取服务器数据
QNetworkAccessManager获取服务器数据
Qt中有2个方式可以实现HTTP协议的发送,一个是使用QNetworkAccessManager,这个是非常常见的,另外是使用QTcpSocket自己构造HTTP格式,也是可以的。
web程序运行如下:
输入10086后:
使用telnet获取web网站数据:
发送命令以及接收如下:
使用QNetworkAccessManager获取服务器数据:
使用QTcpSocket获取数据:
java源码结构如下:
源码如下:
DataSource.java
package my;
import java.util.ArrayList;
public class DataSource {
ArrayList m_records = new ArrayList();
public DataSource(){
m_records.add(new Record("XiaoMing", "10086"));
m_records.add(new Record("XiaoHong", "10087"));
m_records.add(new Record("XiaoGang", "10088"));
}
public Record query(String qq){
for(Record e : m_records){
if(e.qq.equals(qq)){
return e;
}
}
return null;
}
public class Record {
public String name = "";
public String qq = "0000";
public Record(String name, String qq){
this.name = name;
this.qq = qq;
}
}
}
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
My JSP 'index.jsp' starting page
query.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
My JSP 'query.jsp' starting page
<%@ page import="my.*" %>
<%
String qq = request.getParameter("qq");
DataSource db = new DataSource();
DataSource.Record result = db.query(qq);
if(result == null)
{
out.print(" 不存在此记录
");
}
else
{
out.print(" 姓名: " + result.name + ", QQ: " + result.qq + "
");
}
%>
程序结构如下:
widget.ui如下:
源码:
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include
QT_BEGIN_NAMESPACE
class QTcpSocket;
QT_END_NAMESPACE
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();
protected slots:
void btnClicked();
void onConnect();
void onReadyRead();
private:
Ui::Widget *ui;
QTcpSocket *m_socket;
};
#endif // WIDGET_H
main.cpp
#include "widget.h"
#include
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
widget.cpp
#include "widget.h"
#include "ui_widget.h"
#include
#include
#include
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
this->setWindowTitle("QTcpSocket");
m_socket = new QTcpSocket(this);
connect(m_socket, SIGNAL(connected()), this, SLOT(onConnect()));
connect(m_socket, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(btnClicked()));
}
Widget::~Widget()
{
delete ui;
}
void Widget::btnClicked()
{
m_socket->connectToHost("47.101.40.99", 8080);
}
void Widget::onConnect()
{
m_socket->write("GET /GetPostDemo/query.jsp?qq=10086\r\n"
"Host: 47.101.40.99\r\n\r\n");
}
void Widget::onReadyRead()
{
qDebug() << QString::fromUtf8(m_socket->readAll());
}
程序结构如下:
widget.ui是这样的:
源码如下:
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include
QT_BEGIN_NAMESPACE
class QNetworkAccessManager;
class QNetworkReply;
QT_END_NAMESPACE
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
protected slots:
void btnClicked();
void replyFinished(QNetworkReply *reply);
private:
Ui::Widget *ui;
QNetworkAccessManager *m_manager;
};
#endif // WIDGET_H
main.cpp
#include "widget.h"
#include
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
widget.cpp
#include "widget.h"
#include "ui_widget.h"
#include
#include
#include
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
this->setWindowTitle("QNetworkAccessManager");
m_manager = new QNetworkAccessManager(this);
connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(btnClicked()));
connect(m_manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
}
Widget::~Widget()
{
delete ui;
}
void Widget::btnClicked()
{
m_manager->get(QNetworkRequest(QUrl("http://47.101.40.99:8080/GetPostDemo/query.jsp?qq=10086")));
}
void Widget::replyFinished(QNetworkReply *reply)
{
qDebug() << QString::fromUtf8(reply->readAll());
}