iOS网络-AFNetworking序列化

AFN它内部默认把服务器响应的数据当做json来进行解析，所以如果服务器返回给我的不是JSON数据那么请求报错，这个时候需要设置AFN对响应信息的解析方式。AFN提供了三种解析响应信息的方式，分别是：

AFJSONResponseSerializer---------JSON 默认模式

AFXMLParserResponseSerializer---XML
AFHTTPResponseSerializer---------二进制响应数据

还有一种情况就是服务器返回给我们的数据格式不太一致（开发者工具Content-Type:text/xml）,那么这种情况也有可能请求不成功。解决方法:

直接在源代码中修改，添加相应的Content-Type
拿到这个属性，添加到它的集合中

AFJSONResponseSerializer模式示例代码:

-(void)json
{
    //1.创建会话管理者
    AFHTTPSessionManager* manager =  [AFHTTPSessionManager manager];

    NSDictionary *dictM = @{
                            @"username":@"520it",
                            @"pwd":@"520it",
                            @"type":@"JSON"
                            };

    //2.发送GET
    [manager GET:@"http://120.25.226.186:32812/login" parameters:dictM progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSLog(@"成功--%@",responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"失败--%@",error);
    }];
}

AFXMLParserResponseSerializer模式示例代码:

-(void)xml
{
    //1.创建会话管理者
    AFHTTPSessionManager* manager =  [AFHTTPSessionManager manager];

    NSDictionary *dictM = @{
                            @"type":@"XML"
                            };

     manager.responseSerializer = [AFXMLParserResponseSerializer serializer];

    //2.发送GET
    [manager GET:@"http://120.25.226.186:32812/video" parameters:dictM progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSXMLParser *parser) {

        //设置代理
        parser.delegate = self;

        //开始解析
        [parser parse];

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"失败--%@",error);
    }];

}
#pragma mark - NSXMLParserDelegate
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict
{
    NSLog(@"%@---%@",elementName,attributeDict);
}

AFHTTPResponseSerializer模式示例代码:

-(void)http
{
    //1.创建会话管理者
    AFHTTPSessionManager* manager =  [AFHTTPSessionManager manager];

    NSString *urlStr = @"http://img4q.duitang.com/uploads/item/201411/21/20141121231731_PkXNk.jpeg";

    //调整AFN的解析方式
//    manager.responseSerializer = [AFJSONRequestSerializer serializer];//默认
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];

    //2.发送GET
    [manager GET:urlStr parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSLog(@"成功--%@",[responseObject class]);
        NSLog(@"%@",[NSThread currentThread]);
        self.imageView.image = [UIImage imageWithData:responseObject];

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"失败--%@",error);
    }];
}

-(void)http2
{
    //1.创建会话管理者
    AFHTTPSessionManager* manager =  [AFHTTPSessionManager manager];

    NSString *urlStr = @"http://www.baidu.com";

    //调整AFN的解析方式 如果报错(text/html是在报错里面提供的),百分之七八十都是因为缺少这俩句代码原因
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
    //Error Domain=com.alamofire.error.serialization.response Code=-1016 "Request failed: unacceptable content-type: text/html",缺少上面代码报的错误
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    //Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set.",缺少上面代码报的错误

    //2.发送GET
    [manager GET:urlStr parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSLog(@"成功--%@",[responseObject class]);

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"失败--%@",error);
    }];
}