iOS.访问 Web Service.异步GET请求方法

#import <UIKit/UIKit.h>
#import "T20140628024750NSNumber+Message.h"
#import "T20140628024750NSString+URLEncoding.h"

@interface T20140628024750ViewController : UITableViewController<NSURLConnectionDelegate>

@property (nonatomic,strong) NSMutableArray *listData;

//接收从服务器返回数据。
@property (strong,nonatomic) NSMutableData *datas;

// 查询所有
-(void)findAll;

@end

#import "T20140628024750ViewController.h"

@interface T20140628024750ViewController ()

@end

@implementation T20140628024750ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // 1、初始化数据
    [self findAll];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

#pragma mark table dataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.listData.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // 1、初始化重用Cell
    static NSString *reUseCell = @"reUseCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reUseCell];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reUseCell];
    }
    
    // 2、配置重用Cell数据
    NSMutableDictionary*  dict = self.listData[indexPath.row];
    cell.textLabel.text = [dict objectForKey:@"Content"];
    cell.detailTextLabel.text = [dict objectForKey:@"CDate"];
    return cell;
}
-(void)findAll
{
    NSString *strURL = [[NSString alloc] initWithFormat:@"http://127.0.0.1:8080/kujizu/test01.html"];
    NSURL *url = [NSURL URLWithString:[strURL URLEncodedString]];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    
    if (connection) {
        _datas = [NSMutableData new];
    }
}
#pragma mark- NSURLConnection 回调方法
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [_datas appendData:data];
}


-(void) connection:(NSURLConnection *)connection didFailWithError: (NSError *)error {
    
    NSLog(@"%@",[error localizedDescription]);
}

- (void) connectionDidFinishLoading: (NSURLConnection*) connection {
    NSLog(@"请求完成...");
    NSDictionary* resDict = [NSJSONSerialization JSONObjectWithData:_datas options:NSJSONReadingAllowFragments error:nil];
    
    if (resDict == nil) {
        
        self.listData = [[NSMutableArray alloc] init];
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"错误信息" message:@"没有数据。" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
        [alertView show];
    }else{
        
        NSNumber *resultCodeObj = [resDict objectForKey:@"ResultCode"];
        if ([resultCodeObj integerValue] >=0){
            
            self.listData = [resDict objectForKey:@"Record"];
            [self.tableView reloadData];
        } else {
            
            NSString *errorStr = [resultCodeObj errorMessage];
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"错误信息" message:errorStr delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
            [alertView show];
        }
    }
    
}
@end