IOS开发--上传图片

IOS图片上传功能实现总结

IOS图片上传主要分两种方式实现，一个是将图片信息以表单的形式上传，一种是将图片以JSON的格式上传。

首先要讲的是以这两个方式上传的一个比较明显的区别就是HTTP Header是如何标记的，以表单的形式上传时HTTP Header应该设置为multipart/form-data，以JSON格式上传时HTTP Header应该设置为application/json。

Content-Type: multipart/form-data; boundary=${bound}

Content-Type: application/json

了解了这些那我们在IOS项目中应该如何运用他们呢？

一、表单上传图片

       

//分界线的标识符
NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";
//根据url初始化request
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
                                                       cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                   timeoutInterval:10];
//分界线 --AaB03x
NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];
//结束符 AaB03x--
NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];
//要上传的图片
UIImage *image=[params objectForKey:@"pic"];
//得到图片的data
NSData* data = UIImagePNGRepresentation(image);
//http body的字符串
NSMutableString *body=[[NSMutableString alloc]init];
//参数的集合的所有key的集合
NSArray *keys= [params allKeys];

//遍历keys
for(int i=0;i<[keys count];i++)
{
    //得到当前key
    NSString *key=[keys objectAtIndex:i];
    //如果key不是pic，说明value是字符类型，比如name：Boris
    if(![key isEqualToString:@"pic"])
    {
        //添加分界线，换行
        [body appendFormat:@"%@
",MPboundary];
        //添加字段名称，换2行
        [body appendFormat:@"Content-Disposition: form-data; name="%@"

",key];
        //添加字段的值
        [body appendFormat:@"%@
",[params objectForKey:key]];
    }
}

////添加分界线，换行
[body appendFormat:@"%@
",MPboundary];
//声明pic字段，文件名为boris.png
[body appendFormat:@"Content-Disposition: form-data; name="pic"; filename="boris.png"
"];
//声明上传文件的格式
[body appendFormat:@"Content-Type: image/png

"];

//声明结束符：--AaB03x--
NSString *end=[[NSString alloc]initWithFormat:@"
%@",endMPboundary];
//声明myRequestData，用来放入http body
NSMutableData *myRequestData=[NSMutableData data];
//将body字符串转化为UTF8格式的二进制
[myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];
//将image的data加入
[myRequestData appendData:data];
//加入结束符--AaB03x--
[myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];

//设置HTTPHeader中Content-Type的值
NSString *content=[[NSString alloc]initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];
//设置HTTPHeader
[request setValue:content forHTTPHeaderField:@"Content-Type"];
//设置Content-Length
[request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];
//设置http body
[request setHTTPBody:myRequestData];
//http method
[request setHTTPMethod:@"POST"];

//建立连接，设置代理
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];

//设置接受response的data
if (conn) {
    mResponseData = [[NSMutableData data] retain];
}

二、JSON上传图片

     

    //根据url初始化request
    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                       timeoutInterval:10];

    //要上传的图片
    UIImage *image=[params objectForKey:@"pic"];
    //得到图片的data
    NSData* data = UIImagePNGRepresentation(image);
    //base64编码
    NSString *photoStr = [data base64Encoding];

    //参数字典
    NSDictionary *params = [[NSDictionary alloc] init];
    [params setObject:@{@"avatar": photoStr} forKey:@"profile"];
    NSData *myRequestData  = [NSMutableData dataWithData:[NSJSONSerialization dataWithJSONObject:params options:NSJSONWritingPrettyPrinted error:nil]];

//设置http header
[request.request setValue:@"application/json" forHTTPHeaderField:@"Content-type"];
    [request.request setValue:@"application/json" forHTTPHeaderField:@"Accept"];

    //设置http body
    [request setHTTPBody:myRequestData];
    //http method
    [request setHTTPMethod:@"POST"];

    //建立连接，设置代理
    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    //设置接受response的data
    if (conn) {
        mResponseData = [[NSMutableData data] retain];
    }