1//2//ZFViewController.m3//0628-表单验证4//5//Created by zfan on 14-6-28.6//Copyright (c) 2014年 zfan. All rights reserved.7//89#import"ZFViewController.h"10#import"MBPRogressHUD+MJ.h"1112@interfaceZFViewController ()1314@property (weak, nonatomic) IBOutlet UITextField *userNameTextField;15@property (weak, nonatomic) IBOutlet UITextField *passWordTextField;1617@end1819@implementationZFViewController2021- (void)viewDidLoad22{23[super viewDidLoad];24}2526- (IBAction)login:(id)sender27{28//验证账号和密码是否合法29if(self.userNameTextField.text.length ==0)30{31[MBProgressHUD showError:@"请输入账号"];32return;33}3435if(self.passWordTextField.text.length ==0)36{37[MBProgressHUD showError:@"请输入密码"];38return;39}4041//取出账号和密码42NSString *userName =self.userNameTextField.text;43NSString *password =self.passWordTextField.text;4445//生成URL46NSString *urlPath = [NSString stringWithFormat:@"http://192.168.1.101:8080/ZFServer/login?username=%@&pwd=%@", userName, password];47NSURL *url =[NSURL URLWithString:urlPath];4849//生成连接50NSURLRequest *urlRequest =[NSURLRequest requestWithURL:url];5152//建立连接并接收返回数据(同步执行)53//NSData *loginData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:nil error:nil];545556//建立连接并接收返回数据(异步执行)57NSOperationQueue *queue =[[NSOperationQueue alloc] init];58[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {59NSData *loginData =data;60NSLog(@"%ld", (unsignedlong)loginData.length);61}];6263//打印返回的数据长度64NSLog(@"%@", self.userNameTextField.text);65NSLog(@"%@", self.passWordTextField.text);66//NSLog(@"%ld", (unsigned long)loginData.length);67}6869@end
知识要点:
1>通过NSString类方法拼接字符串,生成完整的URL路径;
2>通过NSURLRequest的类方法,利用URL建立一个NSURLRequest连接实例;
3>通过NSConnection的类方法建立连接并接受返回数据,可通过同步方式和异步方式实现:
3.1>同步方式
[NSURLConnection sendSynchronousRequest:urlRequest returningResponse:nil error:nil];
此方法不会新建线程,返回值为NSData,由于未新建线程,因此在该方法未完成前,线程不会继续向下运行,容易造成卡死;
3.2>异步方式
NSOperationQueue *queue =[[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
NSData*loginData =data;
NSLog(@"%ld", (unsignedlong)loginData.length);
}];
此方法会建立一个新的线程用于接受网络端返回数据,返回值为void,当数据接受完毕后会执行block中的语句;