demo 
//  Created by apple on 15/1/6.
//  Copyright (c) 2015年 huweibin. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
@property(nonatomic,strong)UITextView *textView;
@property(nonatomic,copy)NSString *BASE_URL;
@property(nonatomic,copy)NSString *BASE_URL1_PARAM;
@property(nonatomic,strong)NSMutableData *mutableData;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    // Do any additional setup after loading the view, typically from a nib.
}
#pragma mark - get同步
- (IBAction)getSyncButtonAction:(UIButton *)sender
{
    NSString * BASE_URL= @"www.baidu.com";
    //1.准备URL地址
    NSURL *url = [NSURL URLWithString:BASE_URL];
    
    //2.准备请求对象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    //2.1设置请求方式
    [request setHTTPMethod:@"GET"];
    
    //3.准备返回结果
    NSURLResponse *response = nil;
    NSError *error = nil;
    
    //4.创建链接对象,并发送请求,并获取结果(需要的数据)
    NSData *data =http://www.sjsjw.com/100/000571MYM030394/ [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    
    //5.打印获取到的一些信息
    NSLog(@"结果类型:%@",response.MIMEType);
    NSLog(@"请求的网址:%@",response.URL);
    NSLog(@"结果长度:%lld",response.expectedContentLength);
    NSLog(@"请求到的结果:%@",data);
    
    //6.解析文件
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
    
    //7.显示在textView里
    self.textView.text = [NSString stringWithFormat:@"%@",dict];
    
}
#pragma mark - get异步
- (IBAction)getAsyncButtonAction:(UIButton *)sender
{
    //1.准备url地址
    NSURL *url = [NSURL URLWithString:_BASE_URL];
    //2.创建请求对象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    //3.创建链接对象,发送请求
    [NSURLConnection connectionWithRequest:request delegate:self];
    
}
#pragma mark - POST同步
- (IBAction)postSyncButtonAction:(UIButton *)sender
{
    //1.准备网址
    NSURL *url = [NSURL URLWithString:_BASE_URL];
    
    //2.准备请求对象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    //2.1设置请求方式
    [request setHTTPMethod:@"POST"];
    
    //2.2设置请求参数
#warning 设置请求参数,需要的是NSData类型
    NSData *param = [_BASE_URL1_PARAM dataUsingEncoding:NSUTF8StringEncoding];
    [request setHTTPBody:param];
    
    //3.创建链接对象,并发送请求,获取结果
    NSData *data = http://www.sjsjw.com/100/000571MYM030394/[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    
    //4.解析
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
    
    //5.显示
    self.textView.text = [NSString stringWithFormat:@"%@",dict];
}
#pragma mark - POST异步
- (IBAction)postAsyncButtonAction:(UIButton *)sender
{
    __block ViewController *weakSelf = self;
    
    //1.准备地址
    NSURL *url = [NSURL URLWithString:_BASE_URL];
    //2.创建请求对象,并设置请求方法和参数
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:[_BASE_URL1_PARAM dataUsingEncoding:NSUTF8StringEncoding]];
    
    //3.创建链接对象,发送请求,在block内部完成分析
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue new]  completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        //NSLog(@"%@",data);
        
        //4.解析
        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
        
        //5.回到主线程,进行更新页面
        dispatch_sync(dispatch_get_main_queue(), ^{
            weakSelf.textView.text = [NSString stringWithFormat:@"%@",dict];
        });
        
    }];
    
    
    
}
#pragma mark - 清除
- (IBAction)clearButtonAction:(UIButton *)sender
{
    _textView.text = nil;
}
#pragma mark - 实现协议方法
#pragma mark 开始接收请求结果
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    //初始化
    self.mutableData = http://www.sjsjw.com/100/000571MYM030394/[NSMutableData data];
}
#pragma mark - 接收数据
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    //拼接接收到的数据
    [self.mutableData appendData:data];
    
}
#pragma makr - 接收完毕
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    //解析
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:_mutableData options:NSJSONReadingAllowFragments error:nil];
    _textView.text = [NSString stringWithFormat:@"%@",dict];
}
#pragma mark - 接收错误
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    
}- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end