Objective-C 处理JSON的数据源

// 注意！ 需要在工程中添加JSON.framework
    items = [[NSMutableArray alloc] init];

    // 初始化JSON解析器
    SBJSON *parser = [[SBJSON alloc] init];

// 定义JSON数据的来源，例如 http://localhost/MN_MemeberList.php
    NSString *memberListUrl = [NSString stringWithFormat:@"%@/MN_MemberList.php?act=%@",
                               [config getBaseUrl],
                               @"null"
    ];
    NSLog(@"%@",memberListUrl);
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:memberListUrl]];

// 把url的结果返回给response
    NSData *response = [NSURLConnection sendSynchronousRequest:request

    returningResponse:nil error:nil];

// 取得JSON数据的字符串
    NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];

// 把JSON转为数组
    NSArray *memberList = [[NSArray alloc] initWithArray:[parser objectWithString:json_string error:nil]];
    
    for(NSDictionary *member in memberList)
    {
        //NSLog(@"%@",[member objectForKey:@"username"]);
        dataItem *item = [[dataItem alloc] init];
        [item setFullName:[member objectForKey:@"username"] password:[member objectForKey:@"password"] overdue:[member objectForKey:@"overdue"] allow_edit:[member objectForKey:@"allow_edit"]];
        [items addObject:item];
        [item release];
    }
    
    [parser release];
    [memberList release];
    [json_string release];