字符串拼接的get网络请求方法

最新推荐文章于 2024-07-15 03:09:44 发布

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本文介绍了一种使用Objective-C实现GET请求的方法，通过创建一个名为Connection的类并遵循NSURLConnectionDataDelegate协议，实现了网络数据的异步获取。文章详细解释了如何构造请求URL、发送请求及处理响应。

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</pre><pre name="code" class="objc"><span style="font-family:SimHei;font-size:24px;"></span>

</pre><pre name="code" class="objc"><span style="font-family:SimHei;font-size:24px;">我们经常要在代码中通过网络请求来获得数据,其中的一种方法就是get方法,下面为异步请求方法:</span>

<span style="font-family:SimHei;font-size:24px;">先要创建一个名字为Connection的继承于nsobject的类;</span>

<span style="font-family:SimHei;font-size:24px;">在.h文件中需要遵循一下<<span style="color: rgb(52, 149, 175);">NSURLConnectionDataDelegate</span>><span style="color: rgb(52, 149, 175);">协议</span></span>

<span style="font-family:SimHei;font-size:24px;">然后写一个类方法组作为接口:</span>

+ (void)connectionWithUrl:(NSString *)strUrl parmaters:(NSDictionary *)parmaters delegate:(id<ConnectionDelegate>)delegate flag:(NSInteger)flag;

// 网址分为两部分,一部分是固定的,一部分是参数

- (void)startRequest:(NSString *)urlStr parmaters:(NSDictionary *)parmaters

{

NSString *str = @"";

网址的拼接:

for (NSString *key in [parmaters allKeys]) {

if ([str length] == 0) {

str = [NSString stringWithFormat:@"?%@=%@", key, [parmaters objectForKey:key]];

}

else

{

str = [NSString stringWithFormat:@"%@&%@=%@", str, key, [parmaters objectForKey:key]];

}

// 网址不能有空格和汉字

str = [NSString stringWithFormat:@"%@%@", urlStr, str];

str = [str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

// NSLog(@"%@", str);

NSURL *url = [NSURL URLWithString:str];

封装为request请求:

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

[request setHTTPMethod:@"GET"];

建立连接:

[NSURLConnection connectionWithRequest:request delegate:self];

}

+ (void)connectionWithUrl:(NSString *)strUrl parmaters:(NSDictionary *)parmaters delegate:(id<ConnectionDelegate>)delegate flag:(NSInteger)flag

{

Connection *con = [[Connection alloc] init];

con.delegate = delegate;

con.flag = flag;

[con startRequest:strUrl parmaters:parmaters];

[con release];

}

协议执行:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

将数据进行拼接:

[self.data appendData:data];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

用协议将数据返回:

if ([self.delegate respondsToSelector:@selector(selData:flag:)]) {

[self.delegate selData:self.data flag:self.flag];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

}

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