POST请求的forHTTPHeaderField

//
//  NETWorkRequest.h
//  NETWork
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import <Foundation/Foundation.h>

// block的相关定义
typedef void (^NETWorkRequestBlock)(NSMutableURLRequest *request);


@interface NETWorkRequest : NSObject

@property (nonatomic, strong, readonly) NSMutableURLRequest *request;

- (void)configRequest:(NETWorkRequestBlock)block;

@end

//
//  NETWorkRequest.m
//  NETWork
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import "NETWorkRequest.h"

@interface NETWorkRequest ()

@end

@implementation NETWorkRequest

- (instancetype)init
{
    self = [super init];
    if (self)
    {
        _request = [NSMutableURLRequest new];
    }
    return self;
}

- (void)configRequest:(NETWorkRequestBlock)block
{
    block(self.request);
}

@end

//
//  NETWorkConnection.h
//  NETWork
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import <Foundation/Foundation.h>
@class NETWorkRequest;

// block的相关定义
typedef void (^NETWorkConnectionBlock)(NSDictionary *info, NSData *data, NSError *error);

@interface NETWorkConnection : NSObject

@property (nonatomic, strong, readonly) NETWorkRequest  *request;

- (instancetype)initWithRequest:(NETWorkRequest *)request;
- (void)resultBlock:(NETWorkConnectionBlock)block;
- (void)start;

@end

//
//  NETWorkConnection.m
//  NETWork
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import "NETWorkConnection.h"
#import "NETWorkRequest.h"

@interface NETWorkConnection ()<NSURLConnectionDelegate, NSURLConnectionDataDelegate>

@property (nonatomic, copy)   NETWorkConnectionBlock  onncetionBlock;   // 网络连接用block
@property (nonatomic, assign) unsigned long long      expectedLength;   // 从服务器获取期望文件的大小

@property (nonatomic, strong) NSURLConnection        *conncetion;       // 网络连接
@property (nonatomic, strong) NSMutableData          *cacheData;        // 用于缓存的data数据
@property (nonatomic, strong) NSURLResponse          *response;         // 回复
@property (nonatomic, strong) NSMutableDictionary    *info;             // 一些链接的信息

@end

@implementation NETWorkConnection

- (instancetype)initWithRequest:(NETWorkRequest *)request
{
    self = [super init];
    if (self)
    {
        // 开始创建连接
        _conncetion =         [[NSURLConnection alloc] initWithRequest:request.request
                                        delegate:self
                                startImmediately:NO];
        
        // 创建数据容器
        _cacheData = [NSMutableData data];
        
        // 储存一些信息
        _info = [NSMutableDictionary new];
    }
    return self;
}

- (void)start
{
    [self.conncetion start];
}

#pragma mark - delegate
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // 存储一些网络回复的信息
    [_info setObject:@(response.expectedContentLength) forKey:@"expectedContentLength"];
    if (response.suggestedFilename)
        [_info setObject:response.suggestedFilename forKey:@"suggestedFilename"];
    if (response.MIMEType)
        [_info setObject:response.MIMEType          forKey:@"MIMEType"];
    if (response.textEncodingName)
        [_info setObject:response.textEncodingName  forKey:@"textEncodingName"];
    if (response.URL.description)
        [_info setObject:response.URL.description   forKey:@"URL"];
    
    // 走HTTP协议的网络链接会执行括号类的方法
    if([response isKindOfClass:[NSHTTPURLResponse class]])
    {
        NSHTTPURLResponse *r = (NSHTTPURLResponse *)response;
        
        // 获取response
        _response = response;
        
        [_info setObject:r.allHeaderFields forKey:@"allHeaderFields"];
        [_info setObject:@(r.statusCode)   forKey:@"statusCode"];
        
        // 如果能获取到期望的数据长度就执行括号中的方法
        if ([r expectedContentLength] != NSURLResponseUnknownLength)
        {
            // 获取期望下载的数值
            _expectedLength  = [r expectedContentLength];
        }
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData
{    
    // 存储缓存数据
    [_cacheData appendData:theData];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // 如果存在block则执行
    if (_onncetionBlock)
    {
        // 调用block
        _onncetionBlock(_info, _cacheData, nil);
    }
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    // 如果存在block则执行
    if (_onncetionBlock)
    {
        // 调用block
        _onncetionBlock(_info, nil, error);
    }
}

- (void)resultBlock:(NETWorkConnectionBlock)block
{
    // 防止循环引用
    __weak NSMutableDictionary *infoDic = _info;
    
    // 初始化block
    _onncetionBlock = ^(NSDictionary *info, NSData *data, NSError *error)
    {
        // 调用block
        block(infoDic, data, error);
    };
}

- (void)dealloc
{
    /* After this method is called, the connection’s delegate no longer 
     receives any messages for the connection. If you want to reattempt 
     the connection, you should create a new connection object. */
    [_conncetion cancel];
}

@end

#define NUM_STRING(num)  [NSString stringWithFormat:@"%lu", (num)]

/**
 执行一个java脚本获取User-Agent字符串
 
 @return User-Agent字符串
 */
NS_INLINE NSString* UserAgent()
{
    UIWebView* webView = [[UIWebView alloc] initWithFrame:CGRectZero];
    NSString *userAgentString = [webView stringByEvaluatingJavaScriptFromString:
                                 @"navigator.userAgent"];
    
    return userAgentString;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // 创建链接
    /* ============================================================================== */
    NETWorkRequest *request = [NETWorkRequest new];
    [request configRequest:^(NSMutableURLRequest *request)
     {
         // 配置网址链接
         request.URL = [NSURL URLWithString:@"http://webservice.webxml.com.cn/WebServices/MobileCodeWS.asmx/getMobileCodeInfo"];
         
         // 配置请求类型
         request.HTTPMethod = @"POST";
         
         // 配置请求报文
         NSString *dataString = @"mobileCode=15910514636&userID=";
         
         [request setValue:UserAgent()
        forHTTPHeaderField:@"User-Agent"];
         
         [request setValue:@"application/x-www-form-urlencoded"
        forHTTPHeaderField:@"Content-Type"];
         
         [request setValue:NUM_STRING([dataString toUTF8Data].length)
        forHTTPHeaderField:@"Content-Length"];
         
         // 配置包体
         request.HTTPBody = [dataString toUTF8Data];
         
         // 设置时间间隔
         request.timeoutInterval = 1.f;
         
         // 设置缓存策略
         request.cachePolicy = NSURLRequestUseProtocolCachePolicy;
     }];
    
    // 创建请求
    /* ============================================================================== */
    NETWorkConnection *connection = [[NETWorkConnection alloc] initWithRequest:request];
    [connection resultBlock:^(NSDictionary *info, NSData *data, NSError *error) {
        
        ONOXMLDocument *document = [ONOXMLDocument XMLDocumentWithData:data
                                                                 error:nil];
        NSLog(@"%@", document);

    }];
    
    // 开始请求
    /* ============================================================================== */
    [connection start];
}