UI - RequestNetWork

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

#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

#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

#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