Objective-C——NSMutableURLRequest发送POST请求,使用NSJSONSerialization解析JSON字符串

NSString *reqData = @"Data=";
NSData *postDatas = nil;
NSString *urlPath = @"url";

//组json字符串数据
NSMutableDictionary *mulDic = [[[NSMutableDictionary alloc] init] autorelease];
[mulDic setValue:@"P003" forKey:@"type"];

//NSJSONSerialization 组json字符串
if ([NSJSONSerialization isValidJSONObject:mulDic]) {

    postDatas = [NSJSONSerialization dataWithJSONObject:mulDic options:NSJSONWritingPrettyPrinted error:nil];
    NSString *str = [[NSString alloc] initWithData:postDatas encoding:NSUTF8StringEncoding];
    reqData = [reqData stringByAppendingString:str];
    NSLog(@"reqData:%@",reqData);

    //NSData *postData = [reqData dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    postDatas = [NSData dataWithBytes:[reqData UTF8String] length:[reqData length]];

}

NSString *len = [NSString stringWithFormat:@"%d",(int)[postDatas length]];
NSURL *url = [NSURL URLWithString:urlPath];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
//[request setValue:@"*/*" forKey:@"accept"];
//[request setValue:@"Keep-Alive" forKey:@"connection"];
//[request setValue:@"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" forKey:@"user-agent"];
//[request setValue:len forHTTPHeaderField:@"Content-Length"];
//[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postDatas];

NSData *retData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *ret = [[NSString alloc] initWithData:retData encoding:NSUTF8StringEncoding];
NSLog(@"%@",ret)

//解析返回的数据JSON格式字符串
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:retData options:NSJSONReadingMutableLeaves error:nil];
NSLog(@"%@",dic);