UI - RequestNetWork

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<ViewController.h>

#import <UIKit/UIKit.h>@interface ViewController : UIViewController@end

<ViewController.m>

#import "ViewController.h"#import "RequestHandle.h"#define kNewsURL @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"#define kPicURL @"http://image.zcool.com.cn/56/13/1308200901454.jpg"#define kTuDouURL @"http://api.tudou.com/v3/gw?method=album.channel.get&appKey=myKey&format=xml&channel=c&pageNo=1&pageSize=15"@interface ViewController ()<NSURLConnectionDataDelegate,RequestHandleDelegate>@property (retain, nonatomic) IBOutlet UIImageView *imageView;@property (nonatomic,retain)NSMutableData *data;//存储获取数据@end@implementation ViewController/* HTTP 是应用层的网络传输协议,对 HTTP 请求主要流行的方式有两种 GET 请求以及 POST 请求  GET 请求和 POST 请求区别和联系: 1.GET请求,服务器网址以及参数都会出现在我们网络请求的接口中,也就是说参数会作为请求接口的一部分.而POST请求,在接口中只有服务器网址,而参数会作为请求体交给服务器 2.因为 GET 请求参数会作为接口的一部分出现在接口中,所以信息容易捕获,不安全,而 POST 请求参数会被封装在请求体中,作为二进制数据进行传输,不易捕获,安全性高 3.因为接口有字节限制,虽然从理论上 GET请求 和 POST请求都可以进行请求数据和上传数据,但GET 请求参数会占用字节,所以只能进行小数据上传,而 POST 请求参数在请求体二进制数据中,理论上是无限的,所以,我们一般使用 GET 请求获取数据, POST 请求上传数据   *///同步 GET- (IBAction)synGET:(id)sender {        //1.创建 NSURL 对象    //(1)获取 urlString    NSString *urlString = [NSString stringWithFormat:kPicURL];    //(2)重新编码    NSString *newStr = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];        NSURL *url = [NSURL URLWithString:newStr];    //2.创建 NSURLRequeste 请求对象    NSURLRequest *request = [NSURLRequest requestWithURL:url];    //3.请求数据    NSURLResponse *response = nil;    NSError *error = nil;        NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];    NSLog(@"---%@---",response);    NSLog(@"===%@===",error);    NSLog(@"***%@***",data);    //解析//    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];//    NSLog(@"###%@###",dic);        self.imageView.image = [UIImage imageWithData:data];    }//同步 POST- (IBAction)synPOST:(id)sender {    //1.创建 NSURL 对象    NSString *urlString = [NSString stringWithFormat:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"];//一般的,?之前是网址,?之后是参数,这里写入的是网址    NSURL *url = [NSURL URLWithString:urlString];    //2.请求可变请求对象    NSMutableURLRequest *muRequest = [NSMutableURLRequest requestWithURL:url];    //3.设置请求体和请求方式    //(1)创建请求参数    NSString *parameterStr = [NSString stringWithFormat:@"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"];//参数部分    //(2)将请求参数封装成对象        NSData *paraData = [parameterStr dataUsingEncoding:NSUTF8StringEncoding];    //设置请求体和请求方式    [muRequest setHTTPBody:paraData];    [muRequest setHTTPMethod:@"POST"];        //4.请求数据    NSData *data = [NSURLConnection sendSynchronousRequest:muRequest returningResponse:nil error:nil];    //数据处理    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];    NSLog(@"%@",dic);    }//异步 GET- (IBAction)asynGET:(id)sender {        //1.创建 NSURL对象    //(1)创建 urlString    NSString *urlString = [NSString stringWithFormat:kPicURL];    //(2)重新编码    NSString *newString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];    //(3)创建 url    NSURL *url = [NSURL URLWithString:newString];    //2.创建请求对象    NSURLRequest *request = [NSURLRequest requestWithURL:url];    //3.请求数据    //a 使用代理方法回调进行异步网络请求//    [NSURLConnection connectionWithRequest:request delegate:self];//此代理需要服从<NSURLConnectionDataDelegate>协议,其中又服从<NSURLConnectionDelegate>    //b  使用block进行异步网络请求    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {        //当数据获取成功时执行        self.imageView.image = [UIImage imageWithData:data];    }];}//异步 POST- (IBAction)asynPOST:(id)sender {        //创建 NSURL对象    NSString *urlString = [NSString stringWithFormat:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"];    NSURL *url = [NSURL URLWithString:urlString];    //2.创建请求对象    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    //3.设置请求体和请求方式    //(1)获取参数字符串    NSString *paraStr = [NSString stringWithFormat:@"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"];    //(2)转化为 NSData 对象    NSData *paraData = [paraStr dataUsingEncoding:NSUTF8StringEncoding];    request.HTTPBody = paraData;    request.HTTPMethod = @"POST";        //4.请求数据    //a 代理方法回调    [NSURLConnection connectionWithRequest:request delegate:self];    //b 使用 block 进行异步网络请求    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {        NSMutableDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];        NSLog(@"%@",dic);    }];}//================================NSURLConnectionDataDelegate=========================//连接到服务器-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{    NSLog(@"建立链接");    //当连接到服务器的时候  创建对象    self.data = [NSMutableData data ];}//获取数据-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{    NSLog(@"获取数据");    //将所有数据进行拼接    [self.data appendData:data];}//完成请求-(void)connectionDidFinishLoading:(NSURLConnection *)connection{    NSLog(@"请求完成");    //数据请求完成 可以进行数据的操作    //异步GET  //  self.imageView.image = [UIImage imageWithData:_data];    // 异步 POST 解析    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:_data options:0 error:nil];    NSLog(@"%@",dic);    }//请求失败-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{    NSLog(@"请求失败");}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    [[RequestHandle alloc]initWithURLString:kNewsURL paraString:nil method:@"GET" delegate:self];    }-(void)requestHandle:(RequestHandle *)requestHandle didSucceedWithData:(NSMutableData *)data{    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];    NSLog(@"%@",dic);}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (void)dealloc {    [_imageView release];    [super dealloc];}@end

<RequestHandle.h>

#import <Foundation/Foundation.h>@class RequestHandle;@protocol RequestHandleDelegate <NSObject>//请求成功-(void)requestHandle:(RequestHandle *)requestHandle didSucceedWithData:(NSMutableData *)data;//请求失败-(void)requestHandle:(RequestHandle *)requestHandle didfailWithError:(NSError *)error;@end@interface RequestHandle : NSObject@property (nonatomic,assign)id<RequestHandleDelegate>delegate;@property (nonatomic,retain)NSURLConnection *connection;//初始化方法-(id)initWithURLString:(NSString *)urlString paraString:(NSString *)paraString method:(NSString *)method delegate:(id<RequestHandleDelegate>)delegate;//取消请求-(void)cancle;@end

<RequestHandle.m>

#import "RequestHandle.h"@interface RequestHandle ()<NSURLConnectionDataDelegate>@property (nonatomic,retain)NSMutableData *data;//数据存储@end@implementation RequestHandle//初始化方法-(id)initWithURLString:(NSString *)urlString paraString:(NSString *)paraString method:(NSString *)method delegate:(id<RequestHandleDelegate>)delegate{    if ([super init])    {        self.delegate = delegate;        //根据 method 进行 GET  POST 请求的选择        if ([method isEqualToString:@"GET"]) {            //GET 请求            [self requestByGETWithURLString:urlString];                    }else if ([method isEqualToString:@"POST"]){            //POST 请求            [self requestByPOSTWithURLString:urlString paraString:paraString];        }    }    return self;}//GET 请求-(void)requestByGETWithURLString:(NSString *)urlString{    //1.NSURL    NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];    //2.创建请求对象    NSURLRequest *request = [NSURLRequest requestWithURL:url];    //3.建立连接请求数据   self.connection = [NSURLConnection connectionWithRequest:request delegate:self];    }//取消 GET请求-(void)cancle{    [self.connection cancel];}//POST 请求-(void)requestByPOSTWithURLString:(NSString *)urlString paraString:(NSString *)paraString{    //1.NSURL    NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];    //2.创建请求对象    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    //3.请求体和请求方式    NSData *paradata = [paraString dataUsingEncoding:NSUTF8StringEncoding];    request.HTTPBody = paradata;    request.HTTPMethod = @"POST";    //4.请求数据   self.connection = [NSURLConnection connectionWithRequest:request delegate:self];    }//=======================================NSURLConnectionDataDelegate================================//建立连接-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{    self.data = [NSMutableData data];}//获取数据-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{    [self.data appendData:data];}//完成请求-(void)connectionDidFinishLoading:(NSURLConnection *)connection{    if ([self.delegate respondsToSelector:@selector(requestHandle:didSucceedWithData:)]) {        //当数据请求完成之后 告知代理调用协议中的方法将数据拿走        [self.delegate requestHandle:self didSucceedWithData:_data];    }   }//请求失败-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{    if ([self.delegate respondsToSelector:@selector(requestHandle:didfailWithError:)]) {        [self.delegate requestHandle:self didfailWithError:error];    }}@end

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