iOS学习--网络基础

#pragma mark - 测试get方式
-(IBAction)getLogin:(UIButton *)btn
{
    static NSString * loginUrl =@"http://192.168.1.102:8080/IOSApplication/LoginServletController.do";
    
    //初始化数据
    _receiveDate = [NSMutableData data];
    
    //定义URL
    NSString * urlStr = [NSString stringWithFormat:@"%@?username=%@&password=%@",loginUrl,_userName.text,_password.text];
    
    // 注意：网络请求的URL，需要编码才可以使用！！！_
    NSURL *url = [NSURL URLWithString:urlStr];
    
    //// 定义请求
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    //定义连接
    NSURLConnection *cont = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    
    [cont start];
}

#pragma mark - 网络连接错误判断
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"网络连接错误%@",error.localizedDescription);
}

#pragma mark - 接收响应
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"开始接收的响应");
}


#pragma mark - 收到数据
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSLog(@"收到服务器返回的数据：%@",data);
    
    [_receiveDate appendData:data];
}

#pragma mark - 连接结束
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSString *backString = [[NSString alloc]initWithData:_receiveDate encoding:NSUTF8StringEncoding];
    NSLog(@"结束接收的数据 %@",backString);
    
    _receiveDate = nil;
}

#pragma mark - 测试post方式
-(IBAction)postLogin:(UIButton *)btn
{
    
    static NSString * loginUrl =@"http://192.168.1.102:8080/IOSApplication/LoginServletController.do";
    
    //初始化数据
    _receiveDate = [NSMutableData data];
    
    // 定义URL，字母及数字组成的url不需要编码
    NSURL * url = [NSURL URLWithString:loginUrl];
    
    //定义请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    //等待服务器响应时间5
    [request setTimeoutInterval:5.0];
    
    //设置请求方式
    [request setHTTPMethod:@"post"];

    NSString *bodyString = [NSString stringWithFormat:@"username=%@&password=%@",_userName.text,_password.text];
    
    //生成请求数据并编码
    NSData *body = [bodyString dataUsingEncoding:NSUTF8StringEncoding];
    
    // 设置HTTP请求数据体，NSMutableURLRequest会自动在请求头中加入Content-Length
    [request setHTTPBody:body];
    
    //设置连接
    NSURLConnection *cont = [[NSURLConnection alloc]initWithRequest:request delegate:self];
    
    //开始连接
    [cont start];
    
}

#pragma mark - 发送数据给服务器，POST请求使用此方法
- (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite
{
    NSLog(@"发送数据给服务器 bytesWritten: %ld, totalBytesWritten %ld totalBytesExpectedToWrite %ld", bytesWritten,totalBytesWritten,totalBytesExpectedToWrite);
}

//生成post请求
-(NSMutableURLRequest *)postLoginRequest
{
    
    static NSString * loginUrl =@"http://192.168.1.102:8080/IOSApplication/LoginServletController.do";
    
    //初始化数据
    _receiveDate = [NSMutableData data];
    
    // 定义URL，字母及数字组成的url不需要编码
    NSURL * url = [NSURL URLWithString:loginUrl];
    
    //定义请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    //等待服务器响应时间5
    [request setTimeoutInterval:5.0];
    
    //设置请求方式
    [request setHTTPMethod:@"post"];
    
    NSString *bodyString = [NSString stringWithFormat:@"username=%@&password=%@",_userName.text,_password.text];
    
    //生成请求数据并编码
    NSData *body = [bodyString dataUsingEncoding:NSUTF8StringEncoding];
    
    // 设置HTTP请求数据体，NSMutableURLRequest会自动在请求头中加入Content-Length
    [request setHTTPBody:body];
    
    return request;

}

#pragma mark - post 同步方式登录
-(IBAction) synchronizationLogin:(UIButton *)btn
{
    NSMutableURLRequest *request = [self postLoginRequest];
    NSError *error;
    NSURLResponse *response;
    
    NSDate * date = [NSURLConnection  sendSynchronousRequest:request returningResponse:&response error:&error];
    
    // 注意，只有同步请求结束之后，才会执行后续操作，修改LOGIN_URL可以看到效果
    if (!date) {
        NSLog(@"同步访问错误：%@",error.localizedDescription);
    }
    else{
        //解码数据
        NSString *string = [[NSString alloc]initWithData:date encoding:NSUTF8StringEncoding];
        NSLog(@"同步数据 %@",string);
    }

}


#pragma mark - post 异步方式登录
-(IBAction)asynchronizationLogin:(UIButton *)btn
{
    NSMutableURLRequest *request = [self postLoginRequest];
    
    // 注意此处使用了块代码！异步请求队列使用的是操作队列的主队列
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        
        
        if([data length]>0 && connectionError==nil)
        {
            NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
            NSLog(@"异步成功返回的数据%@",string);
        }
        else if ([data length] <=0 && connectionError==nil)
        {
            
            NSLog(@"没有接收到返回数据");
        }
        else
        {
            NSLog(@"异步访问错误%@",connectionError.localizedDescription);
        }
    }];
}