get post小結(jié)

屏幕快照 2017-02-22 下午11.48.25.png

本文demo下載

HTTP簡(jiǎn)介:

HTTP(Hypertext transfer protocol),先說(shuō)下著幾個(gè)單詞，Hypertext是超文本(除了HTML外，也可以是帶有超鏈接的XML或JSON),protocol是協(xié)議，transfer翻譯應(yīng)該是移交(也可以翻譯成傳輸,運(yùn)輸，還有一個(gè)更具體的詞是transport)，最開(kāi)始學(xué)校學(xué)習(xí)Http的所有市面能見(jiàn)到的書(shū)籍都翻譯成超文本傳輸協(xié)議，Http設(shè)計(jì)的本身是為了移交和操作資源

Http提供了幾種方法訪(fǎng)問(wèn)資源.

Http協(xié)議中定義了與服務(wù)器之間交互的八個(gè)方法:get(獲取資源),post(向指定資源提交數(shù)據(jù)進(jìn)行處理請(qǐng)求，增加或者更新資源)，put(向指定資源位置上傳其最新內(nèi)容 ),delete(請(qǐng)求服務(wù)器刪除Request-URI所標(biāo)識(shí)的資源)；

GET和POST異同點(diǎn)

1.可見(jiàn)性,get訪(fǎng)問(wèn)時(shí)URL是所有人都可見(jiàn)的，post則是不可見(jiàn)的.

2.長(zhǎng)度限制
get和post傳遞長(zhǎng)度都是是沒(méi)有限制的
之所以有人說(shuō)get的長(zhǎng)度是有限制的,是因?yàn)間et是放在URL中一起去請(qǐng)求的,瀏覽器限制了URL的長(zhǎng)度導(dǎo)致GET的參數(shù)不能太長(zhǎng),大概長(zhǎng)讀是1 KB;其實(shí)HTTP協(xié)議對(duì)URL的長(zhǎng)度進(jìn)行限制
POST是請(qǐng)求大小是沒(méi)有限制的，Web服務(wù)器會(huì)對(duì)post請(qǐng)求進(jìn)行控制,postIIS請(qǐng)求限制為最多為28.6M，get請(qǐng)求IIS限制為2KB,如有需要可根據(jù)需求修改長(zhǎng)度大小

3.安全性,與 post相比，get的安全性較差，因?yàn)樗l(fā)送的數(shù)據(jù)是 URL 的一部分(登錄的時(shí)候提交數(shù)據(jù)應(yīng)該沒(méi)人會(huì)用get)，post比get更安全，因?yàn)閰?shù)不會(huì)被保存在瀏覽器歷史或 web 服務(wù)器日志中。

4.數(shù)據(jù)類(lèi)型,get只允許 ASCII 字符; post傳遞沒(méi)有限制，也允許二進(jìn)制數(shù)據(jù)。
5 . 編碼類(lèi)型, form的enctype屬性為表單控件的內(nèi)容編碼方式,常見(jiàn)有兩種: application/x-www-form-urlencoded(默認(rèn))和multipart/form-data, 不管get還是post都可以使用者兩種編碼方式,當(dāng)表單中含有type=file文件控件的時(shí)候發(fā)送方式只能使用post,內(nèi)容編碼方式只能使用multipart/part/form-data.
6 . 書(shū)簽, 緩存 , get請(qǐng)求可以收藏為書(shū)簽,能被緩存, post不可以被收藏為書(shū)簽,不可以被緩存
7 . 取值方式 , ASP.NET中對(duì)于get請(qǐng)求Request.QueryString取值, 對(duì)Post請(qǐng)求使用Request.Form

我們?cè)诖a中是如何實(shí)現(xiàn)的呢?

#define BASE_URL @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"
//把上面的數(shù)字換成兩部分 以 ？為分界線(xiàn)
#define URL_POST1 @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"
#define URL_POST2 @"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"

GET同步 <注意這里使用了MJExtension字典轉(zhuǎn)模型框架>

MJExtension:http://www.itdecent.cn/p/bbe7c88d5756

#pragma mark ----------------GET同步--------------
-(IBAction)getTong:(UIButton *)sender{
    // 1 創(chuàng)建URL對(duì)象
    NSURL *url = [NSURL URLWithString:BASE_URL];
    
    // 2 創(chuàng)建請(qǐng)求對(duì)象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    // 2.1 創(chuàng)建請(qǐng)求方式 (默認(rèn)是get這一步可以不寫(xiě))
    [request setHTTPMethod:@"get"];
    
    // 3 創(chuàng)建響應(yīng)對(duì)象(有時(shí)會(huì)出錯(cuò))
    NSURLResponse *response= nil;
    
    // 4 創(chuàng)建連接對(duì)象(同步)
    NSError *error;
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
   
    // http://www.itdecent.cn/p/bbe7c88d5756
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    NSNumber *lastUpdateTime = dict[@"lastUpdateTime"];
    NSLog(@"lastUpdateTime = %@",lastUpdateTime);
    NSArray *Array = dict[@"news"];
    self.dataArray = [NewsModel mj_objectArrayWithKeyValuesArray:Array];
    
    for (NewsModel *newsModal in self.dataArray) {
        NSLog(@"newsModal.title = %@",newsModal.title);
    }
}

POST同步

#pragma mark ---------------POST同步-----------------
- (IBAction)postAction1:(UIButton *)sender {
    NSLog(@"Post同步");
    
    //1 創(chuàng)建URL對(duì)象
    NSURL *url =[NSURL URLWithString:URL_POST1];
    
    //2 創(chuàng)建請(qǐng)求對(duì)象
    NSMutableURLRequest *resuest =[NSMutableURLRequest requestWithURL:url];
    
    //2.1 創(chuàng)建請(qǐng)求方式
    [resuest setHTTPMethod:@"post"];//get可以省略 但是post必須要寫(xiě)
    
    //3 設(shè)置請(qǐng)求參數(shù)
    NSData *tempData = [URL_POST2 dataUsingEncoding:NSUTF8StringEncoding];
    [resuest setHTTPBody:tempData];//設(shè)置請(qǐng)求主體 外界看不見(jiàn)數(shù)據(jù)
    //4 創(chuàng)建響應(yīng)對(duì)象
    NSURLResponse *response = nil;
    
    //5 創(chuàng)建連接對(duì)象
    NSError *error;
    NSData *data = [NSURLConnection sendSynchronousRequest:resuest returningResponse:&response error:&error];
    
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
    
    
    NSNumber *lastUpdateTime = dict[@"lastUpdateTime"];
    NSLog(@"lastUpdateTime = %@",lastUpdateTime);
    NSArray *Array = dict[@"news"];
    self.dataArray = [NewsModel mj_objectArrayWithKeyValuesArray:Array];
    
    for (NewsModel *newsModal in self.dataArray) {
        NSLog(@"newsModal.title = %@",newsModal.title);
    }

}

GET connection異步

#pragma mark ---------------GET connection異步-----------------
-(IBAction)getYibu:(UIButton *)sender{
    
    NSURL *url = [NSURL URLWithString:BASE_URL];
    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestReloadRevalidatingCacheData timeoutInterval:10];
    //連接服務(wù)器
    NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
    [connection start];
    
}


//NSURLConnectionDataDelegate代理方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
{
    NSLog(@"didReceiveResponse");
    _tempData = [NSMutableData data];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;{
    NSLog(@"didReceiveData");
      [_tempData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection;{
    _dataArray = [NSMutableArray arrayWithCapacity:1];
    
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:_tempData options:NSJSONReadingAllowFragments error:nil];
    
    
    NSNumber *lastUpdateTime = dict[@"lastUpdateTime"];
    NSLog(@"lastUpdateTime = %@",lastUpdateTime);
    NSArray *Array = dict[@"news"];
    self.dataArray = [NewsModel mj_objectArrayWithKeyValuesArray:Array];
    
    for (NewsModel *newsModal in self.dataArray) {
        NSLog(@"newsModal.title = %@",newsModal.title);
    }
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    NSLog(@"%@",error);
}

GET Session異步

#pragma mark --------------GET Session異步請(qǐng)求-----------------

- (IBAction)getSession:(UIButton *)sender {
    NSURL *url =[NSURL URLWithString:BASE_URL];
    
    //創(chuàng)建session對(duì)象
    NSURLSession *session =[NSURLSession sharedSession];
    __weak typeof(self)temp =self;
    //創(chuàng)建task（該方法內(nèi)部默認(rèn)使用get）直接進(jìn)行傳遞url即可
    NSURLSessionDataTask *dataTask =[session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        temp.dataArray = [NSMutableArray arrayWithCapacity:1];
        //數(shù)據(jù)操作
        NSDictionary *dict =[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
        
        NSNumber *lastUpdateTime = dict[@"lastUpdateTime"];
        NSLog(@"lastUpdateTime = %@",lastUpdateTime);
        NSArray *Array = dict[@"news"];
        self.dataArray = [NewsModel mj_objectArrayWithKeyValuesArray:Array];
        
        for (NewsModel *newsModal in self.dataArray) {
            NSLog(@"newsModal.title = %@",newsModal.title);
        }
        
        NSLog(@"idStr = %@",self.dataArray[1].type);
        
    }];
    
    //數(shù)據(jù)操作
    [dataTask resume];
    // 注意數(shù)據(jù)操作之后無(wú)法獲得數(shù)據(jù)
    for (NewsModel *newsModal in self.dataArray) {
        NSLog(@"newsModal.title = %@",newsModal.title);
    }
    
}

POST Session異步請(qǐng)求

#pragma mark -------POST Session異步請(qǐng)求---------

- (IBAction)postSession:(UIButton *)sender {
    //創(chuàng)建URL對(duì)象
    NSURL *url =[NSURL URLWithString:URL_POST1];
    //創(chuàng)建請(qǐng)求對(duì)象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"post"];
    NSData *tempdata = [URL_POST2 dataUsingEncoding:NSUTF8StringEncoding];
    [request setHTTPBody:tempdata];
    // 3 建立會(huì)話(huà) session支持三種類(lèi)型的任務(wù)
    
    //    NSURLSessionDataTask  //加載數(shù)據(jù)
    //    NSURLSessionDownloadTask  //下載
    //    NSURLSessionUploadTask   //上傳
    NSURLSession *session =[NSURLSession sharedSession];
    //    NSLog(@"%d",[[NSThread currentThread] isMainThread]);
    
    __weak typeof(self)weakSelf = self;
    
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        //解析
        _dataArray = [NSMutableArray arrayWithCapacity:1];
        NSDictionary *dict =[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
        
        
        NSNumber *lastUpdateTime = dict[@"lastUpdateTime"];
        NSLog(@"lastUpdateTime = %@",lastUpdateTime);
        NSArray *Array = dict[@"news"];
        self.dataArray = [NewsModel mj_objectArrayWithKeyValuesArray:Array];
        
        for (NewsModel *newsModal in weakSelf.dataArray) {
            NSLog(@"newsModal.title = %@",newsModal.title);
        }
        
        NSLog(@"當(dāng)前的線(xiàn)程為%@",[NSThread currentThread]);
        //回到主線(xiàn)程 刷新數(shù)據(jù) 要是刷新就在這里面
        dispatch_async(dispatch_get_main_queue(), ^{
            
            for (NewsModel *model in weakSelf.dataArray) {
                NSLog(@"summary = %@",model.summary);
            }
            
        });
    }];
    //啟動(dòng)任務(wù)
    [dataTask resume];
}
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