UI_GET&POST请求

ViewController.m#import "ViewController.h"#import "MBProgressHUD.h"@interface ViewController ()<NSURLConnectionDataDelegate,MBProgressHUDDelegate>- (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;@property(nonatomic, retain)MBProgressHUD *hud;@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(100, 400, 150, 150)];    self.imageView.backgroundColor = [UIColor cyanColor];    [self.view addSubview:self.imageView];    [_imageView release];    1.创建刷新效果图    self.hud = [[MBProgressHUD showHUDAddedTo:self.view animated:YES] retain];    self.hud.delegate = self;   }- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}2.GET同步请求- (IBAction)synGET:(id)sender {#pragma mark 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,数字和一些特定的符号,比如$,%,/等,所以有中文的网址要先把中文变成相对应的数字编码.    // 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.    // 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:NSJSONReadingMutableContainers error:nil];    NSLog(@"%@", dic);    NSLog(@"%@", response);   }3.POST同步请求.- (IBAction)synPOST:(id)sender {#pragma mark 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];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    2.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.建立连接    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];    // json解析    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];    NSLog(@"%@", dic);    NSLog(@"******************************************************************");//    NSMutableArray *arr = [NSMutableArray array];//    arr = dic[@"news"];    for (NSMutableDictionary *temp in dic[@"news"]) {        NSLog(@"%@", temp[@"summary"]);    }}4.GET异步请求.- (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.请求.    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    3.连接.    // 这个方法只能在2.0~9.0之间的版本使用.    [NSURLConnection connectionWithRequest:request delegate:self];}- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {    // 这个方法会返回相应信息.    // 初始化装数据的容器.    self.data = [NSMutableData data];    }- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {    // 这个方法会接受返回的数据.    [self.data appendData:data];}- (void)connectionDidFinishLoading:(NSURLConnection *)connection {    self.imageView.image = [UIImage imageWithData:self.data];}5.POST异步请求- (IBAction)asynPOST:(id)sender {#pragma mark 异步POST请求数据.    NSString *strURL = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";    NSURL *url = [NSURL URLWithString:strURL];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    // 设置请求方式    [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添加到请求里    [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(@"%@", dic);        }];}6.GETBlock异步请求- (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(@"%@", dic);    }];   }@end#pragma mark 总结:常用的请求方式有两种,一个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