[iOS AFNetworking框架实现HTTP请求、多文件图片上传下载]

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[iOS AFNetworking框架实现HTTP请求、多文件图片上传下载]

[iOS AFNetworking框架实现HTTP请求、多文件图片上传下载]

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简单的JSON的HTTP传输就不说了，看一个简单的DEMO吧。

主要明白parameters是所填参数，类型是字典型。我把这部分代码封装起来了，以便多次调用。也许写在一起更清楚点。

#pragma mark - JSON方式post提交数据
- (void)postJSONWithUrl:(NSString *)urlStr parameters:(id)parameters success:(void (^)(id responseObject))success fail:(void (^)())fail
{AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];// 设置请求格式manager.requestSerializer = [AFJSONRequestSerializer serializer];// 设置返回格式manager.responseSerializer = [AFHTTPResponseSerializer serializer];[manager POST:urlStr parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {//查看返回数据//NSString *result = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];if (success) {success(responseObject);}} failure:^(AFHTTPRequestOperation *operation, NSError *error) {NSLog(@"%@", error);if (fail) {fail();}}];
}

下面是调用方式：返回的json会存在id的变量里，这个jsondataAFN框架有自动转换成字典型，用健直接可以取到值。

//jason解析,根据上传id从数据库取出用户信息
-(void)jasontest{//访问的URLNSString *url = @"http://localhost:8888/chepaishibie/selectuser.php";//需要传进去的参数NSDictionary *parameter = @{@"Driverid": @"10000"};//GET或者POST请求[[ShenAFN sharedInstance] JSONDataWithUrl:url parameter:parameter success:^(id jsondata) {//返回的字符,并输出NSLog(@"success:\n%@", jsondata);//如果是其他字符，可以用以下语句解析返回的语句//NSString *result = [[NSString alloc] initWithData:jsondata encoding:NSUTF8StringEncoding];//如果是json格式，可以通过这种方式获取变量id info1=jsondata[@"info1"];_personname=info1[@"personname"];} fail:^{NSLog(@"请求失败");}];
}

网上实现多图片的上传的教程几乎没，所以在这里特别说下。方便别人学习。

首先看下浏览器端的上传实现：.asp

一般情况下for表单都是默认键值对传输的，当表单类型设置为enctype="multipart/form-data"时，传输会按照二进制传输。

PHP后台和W3C教程基本一样，我稍微改了下，用foreach就能实现动态的单个文件上传或者多个文件上传了。

说明一下，上传文件都放在$_FILES的数组里，获取方式$_FILES["file0"]或者$_FILES["file1"],这个file0就是再下面iOS工程里定义的name。

PHP后台代码如下：

<?    header("Content-type: text/html; charset=UTF-8");include("../configmysql.php");mysql_select_db("chepaiDB",$q); //数据库  //POST获取键值对参数$TEMPid=$_POST['Driverid'];echo "\nDriverid is ".$TEMPid."\n";foreach ($_FILES as $_eachFile) {//file文件处理if ($_eachFile["error"] > 0){echo "错误: " . $_eachFile["error"] . "\n";}else{echo "文件名: " . $_eachFile["name"] . "\n";echo "类型: " . $_eachFile["type"] . "\n";echo "大小: " . ($_eachFile["size"] / 1024) . " Kb\n"; }if (file_exists("uploadimage/" . $_eachFile["name"])){echo $_eachFile["name"] . " 文件已经存在. ";}else{move_uploaded_file($_eachFile["tmp_name"],"uploadimage/" . $_eachFile["name"]);echo "文件已经被存储到: " . "uploadimage/" . $_eachFile["name"]."\n";}}/*//file文件处理if ($_FILES["file"]["error"] > 0){echo "错误: " . $_FILES["file"]["error"] . "\n";}else{echo "文件名: " . $_FILES["file"]["name"] . "\n";echo "类型: " . $_FILES["file"]["type"] . "\n";echo "大小: " . ($_FILES["file"]["size"] / 1024) . " Kb\n"; }if (file_exists("uploadimage/" . $_FILES["file"]["name"])){echo $_FILES["file"]["name"] . " 文件已经存在. ";}else{move_uploaded_file($_FILES["file"]["tmp_name"],"uploadimage/" . $_FILES["file"]["name"]);echo "文件已经被存储到: " . "uploadimage/" . $_FILES["file"]["name"]."\n";}*/
?>

在AFN框架里，FORMDATA的体现，就是[manager POST:urlStr parameters:parameter constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {}这个函数是专门用于formData上传的，还可携带其他参数。

单图上传：

#pragma mark - 单个图片上传
- (void)uploadimgWithurl:(NSString *)urlStr image:(UIImage *)image fileName:(NSString *)fileName success:(void (^)(id responseObject))success fail:(void (^)())fail
{//需要传递的参数,jason格式NSDictionary *parameter = @{@"Driverid": @"10000"};AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];manager.responseSerializer = [AFHTTPResponseSerializer serializer];[manager POST:urlStr parameters:parameter constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {/*文件命名参考代码// 在网络开发中，上传文件时，是文件不允许被覆盖，文件重名// 要解决此问题，// 可以在上传时使用当前的系统事件作为文件名NSDateFormatter *formatter = [[NSDateFormatter alloc] init];// 设置时间格式formatter.dateFormat = @"yyyyMMddHHmmss";NSString *str = [formatter stringFromDate:[NSDate date]];NSString *newfileName = [NSString stringWithFormat:@"%@.png", str];*/[formData appendPartWithFileData:UIImagePNGRepresentation(image) name:@"file" fileName:fileName mimeType:@"image/png"];} success:^(AFHTTPRequestOperation *operation, id responseObject) {if (success) {//NSLog(@"success\n");
            success(responseObject);}} failure:^(AFHTTPRequestOperation *operation, NSError *error) {if (fail) {//NSLog(@"fail\n");
            fail();}}];
}

调用：

//单图片上传
-(void)uploadimg{NSString *url = @"http://localhost:8888/chepaishibie/uploadimage.php";UIImage *image=[UIImage imageNamed:@"swift"];[[ShenAFN sharedInstance] uploadimgWithurl:url image:image fileName:@"myswift.png" success:^(id jsondata) {NSString *result = [[NSString alloc] initWithData:jsondata encoding:NSUTF8StringEncoding];NSLog(@"%@", result);} fail:^{NSLog(@"请求失败");}];
}

多图片上传：主要是利用appendPartWithFileData函数，一个for循环把NSMutablearray里的图片都添加进去。

- (void)uploadMutableimgWithurl:(NSString *)urlStr imagearray:(NSMutableArray *)imgarray success:(void (^)(id responseObject))success fail:(void (^)())fail
{//需要传递的参数,jason格式NSDictionary *parameter = @{@"Driverid": @"10000"};AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];manager.responseSerializer = [AFHTTPResponseSerializer serializer];[manager POST:urlStr parameters:parameter constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {/*文件命名参考代码// 在网络开发中，上传文件时，是文件不允许被覆盖，文件重名// 要解决此问题，// 可以在上传时使用当前的系统事件作为文件名NSDateFormatter *formatter = [[NSDateFormatter alloc] init];// 设置时间格式formatter.dateFormat = @"yyyyMMddHHmmss";NSString *str = [formatter stringFromDate:[NSDate date]];NSString *newfileName = [NSString stringWithFormat:@"%@.png", str];*/for (int i=0; i<[imgarray count]; i++) {[formData appendPartWithFileData:UIImagePNGRepresentation([imgarray objectAtIndex:i]) name:[NSString stringWithFormat:@"file%d",i ] fileName:[NSString stringWithFormat:@"pic%d.png",i] mimeType:@"image/png"];}} success:^(AFHTTPRequestOperation *operation, id responseObject) {if (success) {//NSLog(@"success\n");
            success(responseObject);}} failure:^(AFHTTPRequestOperation *operation, NSError *error) {if (fail) {//NSLog(@"fail\n");
            fail();}}];
}

调用：

//多图片上传
-(void)uploadmutableimg{NSString *url = @"http://localhost:8888/chepaishibie/uploadimage.php";UIImage *image1=[UIImage imageNamed:@"0"];UIImage *image2=[UIImage imageNamed:@"1"];NSMutableArray *imgarray=[[NSMutableArray alloc]init];[imgarray addObject:image1];[imgarray addObject:image2];[[ShenAFN sharedInstance] uploadMutableimgWithurl:url imagearray:imgarray success:^(id jsondata) {NSString *result = [[NSString alloc] initWithData:jsondata encoding:NSUTF8StringEncoding];NSLog(@"%@", result);} fail:^{NSLog(@"请求失败");}];
}

另外JPEG的图片压缩可以用：

UIImageJPEGRepresentation(image,0.5);

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