CYC- 數據解析2

原創

2020-02-20 17:51

GET 與 POST 區別
1. get請求請求的網址全部明文顯示安全性不高
2. get請求請求的網址有字符數的限制大概255個
3. post 請求請求的網址不光是有一個請求的網址還可以攜帶請求體這個請求體是以NSData形式攜帶 NSDATA(以二進制形式存在) 安全性較高
4. post請求網址沒有字符數限制

一般公司都使用 post請求

#import "SecondViewController.h"

@interface SecondViewController ()<NSURLConnectionDataDelegate, NSURLConnectionDelegate>
// 聲明一個可變data 進行異步請求接收數據
@property (nonatomic, retain) NSMutableData *data;

// 聲明屬性 再界面被消毀的時候 用於終止網絡請求
@property (nonatomic ,retain) NSURLConnection *connection;

@end

@implementation SecondViewController

- (void)dealloc
{
    [_connection release];
    [_data release];
    [_connection cancel];
    [super dealloc];
}

- (void)viewDidLoad {


    [self addBarButtonItme];
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)addBarButtonItme
{
    UIBarButtonItem *leftButton = [[ UIBarButtonItem alloc] initWithTitle:@"Post同步" style:(UIBarButtonItemStylePlain) target:self action:@selector(actionLeft:)];
    self.navigationItem.leftBarButtonItem = leftButton;
    [leftButton release];

    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"Post異步" style:(UIBarButtonItemStylePlain) target:self action:@selector(actionRight:)];
    self.navigationItem.rightBarButtonItem = rightButton;
    [rightButton release];
}

#pragma mark - Post同步請求
- (void)actionLeft:(UIBarButtonItem *)leftButton
{
    // 創建 網址對象
    NSURL *url = [NSURL URLWithString:kNewsListURL];

    // 利用網址對象 創建一個請求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:(NSURLRequestUseProtocolCachePolicy) timeoutInterval:30.0];

    // 設置請求類型
    [request setHTTPMethod:@"POST"];

    // 注意:給這個請求 攜帶一個請求體
    // 構建一個請求體 NSData類型
    NSData *pramData = [kNewsListParam dataUsingEncoding:NSUTF8StringEncoding];

    // 攜帶到 請求當中
    [request setHTTPBody:pramData];
    // 利用這個請求 創建一個鏈接 並得到返回的數據
    NSURLResponse *response = nil;
    NSError *error = nil;
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

    NSMutableDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:data options:(NSJSONReadingMutableContainers) error:nil];
    NSLog(@"%@", dataDic);


}

- (void)actionRight:(UIBarButtonItem *)rightButton
{
    // 利用網址字符串 創建網址對象
    NSURL *url = [NSURL URLWithString:kNewsListURL];
    // 利用網址對象 創建請求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0];
    // 設置請求的類型
    [request setHTTPMethod:@"POST"];
    // 給這個請求 攜帶請求體
    NSData *paramData = [kNewsListParam dataUsingEncoding:NSUTF8StringEncoding];
    [request setHTTPBody:paramData];

    /*
    // 利用Block方法 完成異步請求

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

        // data 就是異步請求完成的數據 解析就行
        // 解析數據

        NSMutableDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        NSLog(@"%@", dataDic);

        // 剝香蕉
    }];

    */

    // 利用請求 創建鏈接 利用代理方法 實現異步請求數據
    self.connection = [NSURLConnection connectionWithRequest:request delegate:self];
    [self.connection start];

}

#pragma mark - 代理方法實現
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"請求失敗,錯誤信息");
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    self.data = [NSMutableData data];
    NSLog(@"返回服務器信息, 證明鏈接成功了");
}


- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // 拼接
    [self.data appendData:data];

    NSLog(@"每次返回一點數據 多次執行");
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSMutableDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:(self.data) options:(NSJSONReadingMutableContainers) error:nil];
    NSLog(@"%@", dataDic);
    NSLog(@"完成請求, 此時可以進行數據解析");
}