IOS 网络编程 代码

//  ViewController.m

//  16_网络编程

//  Created by lanou3g on 14-12-19.

//  Copyright (c) 2014年 mxt. All rights reserved.

#import "ViewController.h"

#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"

#define BASE_POST_URL @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?"

#define POST @"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"

@interface ViewController ()<NSURLConnectionDataDelegate>

@property(nonatomic,retain)NSMutableData *mutaData;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

/*

不同点:

1、给服务器传输数据的⽅方式:

GET :通过网址字符串。

POST:通过data

2、传输数据的大小:

GET :网址字符串最多255字节。

POST:使⽤用NSData,容量超过1G

3、安全性:

GET:所有传输给服务器的数据,显示在网址⾥里,类似于密码的明⽂输入,直接可见。

POST:数据被转成NSData(二进制数据),类似于密码的密⽂输入,无法直接读取

*/

//GET 同步

- (IBAction)getSyncButton:(id)sender {

//1, 创建URL

NSURL *url = [NSURL URLWithString:BASE_URL];

//2, 创建NSURLRequest  请求对象

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

//2, 1

[request setHTTPMethod:@"GET"];

//3,返回结果对象：返回值信息

NSURLResponse *response = nil;

NSError *error = nil;

//4,创建链接对象 NSURLConnection

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

// NSLog(@"返回类型 %@ ",response);//打印返回值信息

// NSLog(@"--------------------%@",data);

//6 解析

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

//NSLog(@"+++++++++%@",dic);

// NSLog(@"%@",[dic valueForKey:@"news"]);

}

//post 同步

- (IBAction)postSyncButton:(id)sender {

//1,创建URL

NSURL *url = [NSURL URLWithString:BASE_POST_URL];

//1,1 设置请求体中的参数，进行编码

NSString *post = [NSString stringWithFormat:POST];

NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding];

//2,创建NSURLRequest  请求对象(可变 是因为要设置参数)

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

//2,1

[request setHTTPMethod:@"POST"];

[request setHTTPBody:postData];

NSError *error = nil;

//3,创建链接对象 NSURLConnection  （同步 不设置代理）

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&error];

// NSLog(@"--------------------%@",data);

//6 解析

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

NSLog(@"+++++++++%@",dic);

// NSLog(@"%@",[dic valueForKey:@"news"]);

}

/*

异步联接有两种实现⽅方式:

1, 设置代理,接收数据

2, 实现block（多线程）

*/

//GET异步

- (IBAction)getAsyncButton:(id)sender {

//  GET异步 + block

//1, 创建URL

NSURL *url = [NSURL URLWithString:BASE_URL];

//2, 创建NSURLRequest  请求对象

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

//2,1

[request setHTTPMethod:@"GET"];

//创建操作队列

NSOperationQueue *queue = [[NSOperationQueue alloc] init];

//3,创建链接对象 NSURLConnection (在block 内部完成解析)

__block ViewController *weakSelf = self;

[NSURLConnection  sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

//3,1 解析

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

//NSLog(@"+++++++++%@",dic);

//永远不要在子线程更新UI

dispatch_async(dispatch_get_main_queue(), ^{

//回到主线程 更新UI

weakSelf.textView.text = [NSString stringWithFormat:@"%@",dic];

});

}];

NSLog(@">>>>>>>>>>>>>>><<<>>%lu",_textView.retainCount);

[queue release];

/*

//1, 创建URL

NSURL *url = [NSURL URLWithString:BASE_URL];

//2, 创建NSURLRequest  请求对象

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

//2,1

[request setHTTPMethod:@"GET"];

//3, 创建链接对象 发送请求  设置代理

[NSURLConnection connectionWithRequest:request delegate:self];

*/

}

#pragma mark -NSURLConnectionDataDelegate

//开始接受

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)respons

{

NSLog(@"开始接受");

self.mutaData = [NSMutableData data];

NSLog(@"%lu",_mutaData.retainCount);

}

//接受数据

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

NSLog(@"---------接受数据");

[self.mutaData appendData:data];

}

//接受完毕

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

NSLog(@"++接受完毕");

//解析

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:_mutaData options:NSJSONReadingMutableContainers error:nil];

NSLog(@"%@",dic);

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

NSLog(@"错误");

}

//POST 异步

- (IBAction)postAsyncButton:(id)sender {

//1,创建URL

NSURL *url = [NSURL URLWithString:BASE_POST_URL];

//1,1 设置请求体中的参数，进行编码

NSString *post = [NSString stringWithFormat:POST];

NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding];

//2,创建NSURLRequest  请求对象(可变 是因为要设置参数)

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

//2,1

[request setHTTPMethod:@"POST"];

[request setHTTPBody:postData];

//创建操作队列

NSOperationQueue *queue = [[NSOperationQueue alloc] init];

//3,创建链接对象 NSURLConnection (在block 内部完成解析)

__block ViewController *weakSelf = self;

[NSURLConnection  sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

//3,1 解析

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

//NSLog(@"+++++++++%@",dic);

//永远不要在子线程更新UI

dispatch_async(dispatch_get_main_queue(), ^{

//回到主线程 更新UI

weakSelf.textView.text = [NSString stringWithFormat:@"%@",dic];

});

}];

NSLog(@">>>>>>>>>>>>>>><<<>>%lu",_textView.retainCount);

[queue release];

}

- (void)dealloc

{

[_mutaData release];

[_textView release];

[super dealloc];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end