get-post请求

Single View Application

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController


@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()<NSURLConnectionDataDelegate>
- (IBAction)synGET:(id)sender;
- (IBAction)synPOST:(id)sender;
- (IBAction)asynGET:(id)sender;
- (IBAction)asynPOST:(id)sender;
- (IBAction)asynGETBlock:(id)sender;
@property(nonatomic, retain)NSMutableData *data;
@property(nonatomic, retain)UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(110, 400, 150, 150)];
    self.imageView.backgroundColor = [UIColor cyanColor];
    [self.view addSubview:self.imageView];
    [_imageView release];

//    NSUserDefaults

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)synGET:(id)sender {
    //  同步GET请求
    NSString *strURL = @"http://api.map.baidu.com/place/v2/search?query=银行&region=大连&output=json&ak=6E823f587c95f0148c19993539b99295";
    //  因为网址里面不允许有汉字, 只能有26个字母的大小写, 和一些特定的符号, 不如&, %, / 等吗所以有中文的网址要先把中文编程相对应的数字编码
    //  时间戳
    NSString *strURLEncode = [strURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    //  1. 创建一个URL
    NSURL *url = [NSURL URLWithString:strURLEncode];
    //  2. 发送一个请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    //  3. 建立一个连接
//    NSURLSession 网络请求 自己看
    //  参数1: 把创建好的请求发送
    //  参数2: 返回的响应信息
    //  参数3: 错误信息
    NSURLResponse *response = nil;
    NSError *error = nil;
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    //  把data进行json解析
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    NSLog(@"**同步get**%@", dic);
//    NSLog(@"%@", response);


}

- (IBAction)synPOST:(id)sender {
    //  post请求需要在请求的过程里, 添加一个body, 添加之后才可以获取数据
    NSString *urlStr = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
    //  1. 创建一个URL
    NSURL *url = [NSURL URLWithString:urlStr];
    //  2. 创建一个请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    //  指定请求的方式, 默认是get请求
    [request setHTTPMethod:@"POST"];
    //  body的字符串
    NSString *bodyStr = @"date=20131129&startRecord=1&len=30&udid=1234567890&terminalType=Iphone&cid=213";
    //  body的字符串变成NSData
    NSData *bodyData = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];
    //  把bodyData放到request中
    [request setHTTPBody:bodyData];

    //  3. 建立一个连接
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    //  json解析
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    NSLog(@"**同步post**%@", dic);

//    NSArray *firstArr = dic[@"news"];
//    for (NSDictionary *tempDic in firstArr) {
//        NSLog(@"!~!%@", tempDic[@"summary"]);
//    }

}

- (IBAction)asynGET:(id)sender {
    NSString *strURL = @"http://img4.duitang.com/uploads/item/201207/28/20120728105310_jvAjW.thumb.600_0.jpeg";
    //  1. 创建URL
    NSURL *url = [NSURL URLWithString:strURL];
    //  2. 创建一个请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    //  连接
    //  这个方法可以在2.0到9.0之间的版本使用, 9.0以上的版本不能使用这个方法, 注意!!!
    [NSURLConnection connectionWithRequest:request delegate:self];



}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    //  这个方法会返回响应信息
    //  初始化装数据的容器
    self.data = [NSMutableData data];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    //  这个方法会接收返回的数据
    //  append是累加的意思
    [self.data appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    self.imageView.image = [UIImage imageWithData:self.data];
}

- (IBAction)asynPOST:(id)sender {
    //  异步post请求数据
    NSString *strURL = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
    //  1. 创建URL
    NSURL *url = [NSURL URLWithString:strURL];
    //  2. 创建一个请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    //  设置请求的方式
    [request setHTTPMethod:@"POST"];
    //  body的字符串
    NSString *bodyStr = @"date=20131129&startRecord=1&len=30&udid=1234567890&terminalType=Iphone&cid=213";
    //  body转换成NSData
    NSData *bodyData = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];
    //  把bodyData添加到请求中
    [request setHTTPBody:bodyData];
    //  建立连接
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        //  data就是请求下来的数据
        //  block里进行数据的解析
        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        NSLog(@"**异步post**%@", dic);

    }];

}

- (IBAction)asynGETBlock:(id)sender {

    NSString *strURL = @"http://project.lanou3g.com/teacher/yihuiyun/lanouproject/movielist.php";
    NSURL *url = [NSURL URLWithString:strURL];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        NSLog(@"**异步getBlock**%@", dic);
    }];
}
@end

#pragma mark    总结: 常用的请求方式有两种, 一个是GET, 一个是POST, 它俩本质上没有任何区别, 只是POST在请求的时候需要添加一个body, 同步和异步: 都是用异步的方式进行加载, 加载过程中还可以操作其他的功能, 不会出现卡死的情况, 从同步演化出异步, 请求分为三步: 1. 创建URL, 2. 创建请求request, 3. 建立连接, 完成数据请求, iOS9.0之后, NSURLConnection用的越来越局限, NSURLSession未来更重要