ASIHTTPRequest足够了吗

ASIHTTPRequest足够了吗？

        大家都知道ASIHTTPRequest系列的类很好用，功能很强大。但也像NSURLConnection一样，一个网络请求就需要实例化一个对象，而且无法避免重复请求的问题。

        我个人不习惯用ASIHTTPRequest，因为它功能太强大了，函数太多了，而我们平时的项目仅仅是处理基于HTTP协议的网络交互，用ASIHTTPRequest未免太“奢侈”了。更重要的是，它并无法避免网络的重复请求的问题，而且无法控制网络请求数量，所以仅仅使用ASIHTTPRequest还不够。

        事实上，用NSURLConnection足够了。下面是我写的封装

HTTPConnection.h

//// HTTPConnection.m// //// Created by Jianhong Yang on 12-1-3.// Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import "HTTPConnection.h"@interface HTTPConnection (Private)- (void)startHTTPConnection;@end@implementation HTTPConnection@synthesize delegate = _delegate;- (id)init{ self = [super init]; if (self) { // Custom initialization. _numberOfHTTPConnection = 0; _marrayTaskDic = [[NSMutableArray alloc] initWithCapacity:5]; } return self;}- (void)dealloc{ //清空任务 [self clearRequest]; // [_marrayTaskDic release]; [super dealloc];}#pragma mark -#pragma mark Public// 根据URL获取Web数据// dicParam// type:int,请求类型- (BOOL)requestWebDataWithURL:(NSString *)strURL andParam:(NSDictionary *)dicParam{ if (nil == dicParam) { return NO; } NSURL *url = [NSURL URLWithString:strURL]; NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url]; BOOL success = [self requestWebDataWithRequest:request andParam:dicParam]; [request release]; return success;}// 根据URLRequest获取Web数据// dicParam// type:int,请求类型- (BOOL)requestWebDataWithRequest:(NSURLRequest *)request andParam:(NSDictionary *)dicParam{ if (nil == dicParam) { return NO; } //请求类型必须存在 if (nil == [dicParam objectForKey:@"type"]) { HTTPLOG(@"任务参数不足"); return NO; } //正在处理或等待处理的任务不再接收 for (NSDictionary *dicTask in _marrayTaskDic) { // if ([dicParam isEqualToDictionary:[dicTask objectForKey:@"param"]]) { HTTPLOG(@"任务重复:%@", dicParam); return NO; } } HTTPLOG(@"添加新任务，参数:%@", dicParam); NSMutableDictionary *mdicTask = [[NSMutableDictionary alloc] initWithCapacity:3]; //设置数据缓存 NSMutableData *mdataCache = [[NSMutableData alloc] init]; [mdicTask setObject:mdataCache forKey:@"cache"]; [mdataCache release]; //参数 [mdicTask setObject:dicParam forKey:@"param"]; //创建HTTP网络连接 NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; [mdicTask setObject:urlConnection forKey:@"connect"]; [urlConnection release]; //保存到数组 [_marrayTaskDic addObject:mdicTask]; [mdicTask release]; [self startHTTPConnection]; return YES;}//取消网络请求- (BOOL)cancelRequest:(NSDictionary *)dicParam{ if (nil == dicParam) { return NO; } //遍历所有任务 for (int i = 0; i < _marrayTaskDic.count; i++) { //查看任务是否相同 NSDictionary *dicTask = [_marrayTaskDic objectAtIndex:i]; if ([dicParam isEqualToDictionary:[dicTask objectForKey:@"param"]]) { //取消网络请求 NSURLConnection *connect = [dicTask objectForKey:@"connect"]; [connect cancel]; //从任务队列中删除 [_marrayTaskDic removeObjectAtIndex:i]; _numberOfHTTPConnection -= 1; return YES; } } return NO;}//清空网络请求- (void)clearRequest{ //遍历所有任务 for (NSDictionary *dicTask in _marrayTaskDic) { NSURLConnection *connect = [dicTask objectForKey:@"connect"]; [connect cancel]; // _numberOfHTTPConnection -= 1; } //从任务队列中删除 [_marrayTaskDic removeAllObjects];}#pragma mark -#pragma mark NSURLConnectionDataDelegate- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ HTTPLOG(@"网络请求错误:%@", error); // NSDictionary *dicTask = nil; for (int i = 0; i < _marrayTaskDic.count; i++) { NSDictionary *dic = [_marrayTaskDic objectAtIndex:i]; //找到网络连接相应的数据字典 if ([dic objectForKey:@"connect"] == connection) { dicTask = dic; break; } } // if (dicTask) { [dicTask retain]; //删除 [_marrayTaskDic removeObject:dicTask]; NSDictionary *dicParam = [dicTask objectForKey:@"param"]; if ([_delegate respondsToSelector:@selector(httpConnect:error:with:)]) { [_delegate httpConnect:self error:error with:dicParam]; } [dicTask release]; _numberOfHTTPConnection -= 1; } // [self startHTTPConnection];}- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ HTTPLOG(@"网络请求收到响应"); // NSDictionary *dicTask = nil; for (int i = 0; i < _marrayTaskDic.count; i++) { NSDictionary *dic = [_marrayTaskDic objectAtIndex:i]; //找到网络连接相应的数据字典 if ([dic objectForKey:@"connect"] == connection) { dicTask = dic; break; } } // if ([response isMemberOfClass:NSHTTPURLResponse.class]) { NSHTTPURLResponse *responseHTTP = (NSHTTPURLResponse *)response; NSUInteger statusCode = responseHTTP.statusCode; NSDictionary *dicAllHeaderFields = responseHTTP.allHeaderFields; NSDictionary *dicParam = [dicTask objectForKey:@"param"]; //收到服务器返回的HTTP信息头 SEL receiveResponse = @selector(httpConnect:receiveResponseWithStatusCode:andAllHeaderFields:with:); if ([self.delegate respondsToSelector:receiveResponse]) { [self.delegate httpConnect:self receiveResponseWithStatusCode:statusCode andAllHeaderFields:dicAllHeaderFields with:dicParam]; } }}- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ HTTPLOG(@"网络请求收到数据"); // NSDictionary *dicTask = nil; for (int i = 0; i < _marrayTaskDic.count; i++) { NSDictionary *dic = [_marrayTaskDic objectAtIndex:i]; //找到网络连接相应的数据字典 if ([dic objectForKey:@"connect"] == connection) { dicTask = dic; break; } } // if (dicTask) { //向缓存中添加数据 NSMutableData *mdataCache = [dicTask objectForKey:@"cache"]; [mdataCache appendData:data]; NSDictionary *dicParam = [dicTask objectForKey:@"param"]; HTTPLOG(@"该数据的参数：%@", dicParam); //收到部分数据 if ([self.delegate respondsToSelector:@selector(httpConnect:receiveData:with:)]) { [self.delegate httpConnect:self receiveData:data with:dicParam]; } } HTTPLOG(@"网络请求收到数据并处理完成");}- (void)connectionDidFinishLoading:(NSURLConnection *)connection{ HTTPLOG(@"网络请求结束"); // NSDictionary *dicTask = nil; for (int i = 0; i < _marrayTaskDic.count; i++) { NSDictionary *dic = [_marrayTaskDic objectAtIndex:i]; //找到网络连接相应的数据字典 if ([dic objectForKey:@"connect"] == connection) { dicTask = dic; break; } } // if (dicTask) { [dicTask retain]; //删除 [_marrayTaskDic removeObject:dicTask]; NSData *dataCache = [dicTask objectForKey:@"cache"]; NSDictionary *dicParam = [dicTask objectForKey:@"param"]; if ([_delegate respondsToSelector:@selector(httpConnect:finish:with:)]) { [_delegate httpConnect:self finish:dataCache with:dicParam]; } [dicTask release]; _numberOfHTTPConnection -= 1; } [self startHTTPConnection];}#pragma mark - Private- (void)startHTTPConnection{ if (_numberOfHTTPConnection < MAXNUMBER_HTTPCONNECTION) { if (_numberOfHTTPConnection < _marrayTaskDic.count) { NSDictionary *dicTask = [_marrayTaskDic objectAtIndex:_numberOfHTTPConnection]; NSURLConnection *urlConnection = [dicTask objectForKey:@"connect"]; [urlConnection start]; // _numberOfHTTPConnection += 1; } } HTTPLOG(@"正在处理的网络请求数：%i，等待处理的网络请求：%i", _numberOfHTTPConnection, _marrayTaskDic.count-_numberOfHTTPConnection);}@end
        这个类有四个接口，后两个是取消网络请求的，不必讨论。前两个是发起网络请求的，用的最多的就是这两个接口了。如果只是通过GET方法从服务器取数据，第一个接口足够了。当然也可以用第二个。如果需要用POST方式向服务器发送数据，得用第二个接口。

        第一个接口的第一个参数是URL字符串，第二个参数用来区分网络请求的，如果两次请求的第二个参数一样，第二次请求会被过滤掉。这个参数还有一个作用，就是协议回调函数的参数，用来让上层区分网络请求的。

        第二个接口的第一个参数是NSURLRequest类型，用来设置网络请求参数的，比如POST、要发送的数据流、HTTP信息头等。第二个参数的作用跟第一个接口的第二个参数一样。

        该类对应的协议就不必谈了，大家能看懂的。该类功能的具体实现，大家自己分析。

        有什么问题记得联系我O

1楼yjh4866昨天 11:55

对了，dicParam字典里要加个type关键字的值啊，意思是网络请求类型。n当然也可以不用这个关键字，但要把71,72,73,74注掉啊，至少要注掉73行的return NO;

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