Qt实现客户端发送Http请求

ゝ一纸荒年。 2023-02-20 06:29 93阅读 0赞

首先开发一个Http的服务器，这里使用springboot快速开发一个Get接口和一个Post接口

@RestController
    public class httpServer {
    
    
        @GetMapping("/get")
        public String getTest(String a){
            return "get return:hello "+a;
        }
    
        @PostMapping("/post")
        public String postTest(String b){
            return "post return:hello "+b;
        }
    }

指定服务器的端口为8088

ok，下面回到qt ，新建一个QWidget窗口，

添加网络支持

QT += network

进入ui设计,拖入4个label控件和一个button控件

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E4OTcxODA2NzM_size_16_color_FFFFFF_t_70]

回到wid窗口对应的代码区

输入一下代码

#include "widget.h"
    #include "ui_widget.h"
    #include<QNetworkAccessManager>
    #include<QNetworkReply>
    
    
    Widget::Widget(QWidget *parent)
        : QWidget(parent)
        , ui(new Ui::Widget)
    {
        ui->setupUi(this);
    
      }
    
    void Widget::finishedSlot(QNetworkReply *reply)
    {
         if (reply->error() == QNetworkReply::NoError)
         {
             QByteArray bytes = reply->readAll();
             qDebug() << bytes;
             if(reply->url()==QUrl("http://127.0.0.1:8088/get?a=qt")){
                  ui->label_3->setText(bytes);
             }else{
                  ui->label_4->setText(bytes);
             }
    
    
    
         }
         else
         {
             qDebug() << "finishedSlot errors here";
             qDebug( "found error .... code: %d\n", (int)reply->error());
             qDebug(qPrintable(reply->errorString()));
         }
         reply->deleteLater();
    }
    
    Widget::~Widget()
    {
        delete ui;
    }
    
    
    
    void Widget::on_pushButton_clicked()
    {
    
        QNetworkAccessManager *accessManager = new QNetworkAccessManager(this);
    
        connect(accessManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(finishedSlot(QNetworkReply*)));
    
        QNetworkRequest request;
        request.setUrl(QUrl("http://127.0.0.1:8088/get?a=qt"));
    
        //get
       accessManager->get(request);
    
    
        request.setUrl(QUrl("http://127.0.0.1:8088/post"));
        QByteArray postData;
        postData.append("b=qt");
    
        //post
        accessManager->post(request, postData);
    
    }

在button的clicked的槽函数中添加http请求的处理，分别发送Get请求和Post请求

启动项目看看：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E4OTcxODA2NzM_size_16_color_FFFFFF_t_70 1]

点击发送

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E4OTcxODA2NzM_size_16_color_FFFFFF_t_70 2]

成功了 还是比较简单的。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E4OTcxODA2NzM_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200623224500372.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E4OTcxODA2NzM=,size_16,color_FFFFFF,t_70
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