多线程与网络之NSURLConnection发送请求

时间：2023-03-10 04:49:15
多线程与网络之NSURLConnection发送请求

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h4 {
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img {
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span.frame {
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float: left; }
span.frame span span {
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color: #333333;
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padding: 5px 0 0; }
span.align-center {
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span.align-center > span {
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span.align-center span img {
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-->

HTTP

  • 1.简介
    • 1.URL:统一资源分配符
    • 2.协议名://主机地址/路径
    • 3.HTTP: 超文本传输协议

NSURLConnection

  • 1.基本简介:

    • 1.1 NSURLRequest: 一个这对象代表一个请求,里面有:
      • 一个NSURL对象
      • 请求方法,请求头,请求体
      • 请求超时...
    • 1.2 NSMutableURLRequest: NSURLRequest的子类

  • 2.使用步骤:

    • 2.1 创建一个NSURL对象,设置请求路径(协议名://主机地址/路径 + ? + 参数1 & 参数2)
    • 2.2 传入NSURL创建一个NSURLRequest对象,设置请求头和请求体(默认就有)
    • 2.3 使用NSURLConnection发送请求(得到服务器返回的数据)
    • 2.5 解析服务器响应的数据(将NSData转成NSString)

  • 3.发送GET请求

    // 第一种:同步
    
// 1.创建一个NSURL对象,设置请求路径
    
NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=xiao&pwd=xiao&type=JSON"];

// 2.传入NSURL创建一个NSURLRequest对象,设置请求头和请求体(默认存在)
    
NSURLRequest *request = [NSURLRequest requestWithURL:url];

// 3.使用NSURLConnection发送请求,得到服务器返回的NSData数据
    
NSURLResponse *response = nil;  // 真实类型是NSHTTPURLResponse
    
NSError *error = nil;
    
/*
    
 第一个参数:请求对象
    
 第二个参数:响应头信息,传地址
    
 第三个参数:错误信息, 传地址
    
 */
    
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

// 第二种:异步
    
// 1.创建一个NSURL对象.设置请求路径
    
NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=520it&pwd=520it&type=JSON"];
    
// 2.创建一个NSURLRequest对象,设置请求头和请求体(默认存在)
    
NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
// 3.使用NSURLConnection发送网络请求
    
[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init]
    
    completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {

    NSLog(@"%@", [NSThread currentThread]);
    
    // 4.解析服务器响应的数据
    
    NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    
    NSLog(@"%@", str);
    
}];

// 第三种:(异步代理)注意data一定要拼接
    
- (void)sendAsyncDelegate
    
{
    
// 1.创建一个NSURL对象,设置请求路径
    
NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=520it&pwd=520it&type=JSON"];
    
// 2.创建一个NSURLRequest对象,设置请求头和请求体(默认存在)
    
NSURLRequest *request = [NSURLRequest requestWithURL:url];

// 3.使用NSURLConnection来发送请求(返回服务器响应的数据)
    
//    [NSURLConnection connectionWithRequest:request delegate:self]; // 第一种
    
//    [[NSURLConnection alloc] initWithRequest:request delegate:self]; // 第二种

NSURLConnection *connect = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO]; // 第三种
    
// 如果 startImmediately 设置成NO时,必须调用start方法调用
    
[connect start];
    
}
    
// 实现代理方法
    
// 1.当接受到服务器响应的时候调用
    
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
    
{
    
self.dataM = [NSMutableData data];
    
}
    
// 2.当接收到服务器返回的二进制数据的时候调用, 会调用多次
    
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
    
{
    
[self.dataM appendData:data];
    
}
    
// 3.当请求失败或者错误的时候调用(请求超时)
    
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
    
{}
    
// 4.当请求结束的事后调用
    
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
    
{
    
// 解析数据
    
NSString *str = [[NSString alloc] initWithData:self.dataM encoding:NSUTF8StringEncoding];
    
NSLog(@"%@", str);
    
}

  • 4.发送POST请求

    // 1.创建NSURL
    
NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login"];

// 2.创建NSMutableURLRequest
    
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
// 2.1 设置NSMutableURLRequest的属性
    
request.HTTPMethod = @"POST";
    
request.HTTPBody = [@"username=520it&pwd=520it&type=JSON" dataUsingEncoding:NSUTF8StringEncoding];

request.timeoutInterval = 10.0; //过期时间

[request setValue:@"ios10" forHTTPHeaderField:@"User-Agent"];

// 3.发送请求
    
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue]
    
    completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {

    // 解析数据
    
    NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    
}];

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