post上传图片到服务器

           这几天,项目需要将图片,音频文件(如mp3)上传到服务器,以方便之后的使用。在网上查询了很多资料,一般有以下几种方式,1.ASIHTTPRequest 方式

2. AFNetWorking方式,3. ASIFormDataRequest方式    4 .NSMutableURLRequest方式。前面3种方式都需要加载对应的库或者第3方库,我并没有搞出来。所以现在就第3种方式进行说明。

       JAVA可以使用表单方式直接上传图片,音频等等。但IOS并没有提供类似的方式,如果要使用的话,就需要模拟出类似的post请求,java段post源代码为:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Form Page</title>
</head>
<body>
  <h1>Upload a File</h1>
  
     <form action="http://192.168.2.153:28080/upload" method="post" enctype="multipart/form-data">
 
        <p>
         Select a file : <input type="file" name="file" size="50" />
        </p>
 
        <input type="submit" value="Upload It" />
     </form>
 
 </body>
 </html>


 

以下是我封装的代码,参考网上进行修改的:

+(NSString*)uploadImage:(NSString*)url param:(NSMutableDictionary*)params format:(NSString*)fmat
{
    //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=[UIImage imageNamed:[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:@"%@\r\n",MPboundary];
            //添加字段名称,换2行
            [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];
            //添加字段的值
            [body appendFormat:@"%@\r\n",[params objectForKey:key]];
        }
    }
    
    ////添加分界线,换行
    [body appendFormat:@"%@\r\n",MPboundary];
    //声明pic字段,文件名为boris.png
    //[body appendFormat:@"Content-Disposition: form-data; name=\"pic\"; filename=\"text02.png\"\r\n"];
    
    [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n",FORM_FLE_INPUT,[params objectForKey:@"pic"]];

    //声明上传文件的格式
    //[body appendFormat:@"Content-Type: image/png,image/jpeg\r\n\r\n"];
    NSString *contype = [NSString stringWithFormat:@"Content-Type: %@\r\n\r\n",fmat];
    NSLog(@"content type=%@",contype);
    [body appendFormat:@"Content-Type: %@\r\n\r\n",fmat];
    
    //声明结束符:--AaB03x--
    NSString *end=[[NSString alloc]initWithFormat:@"\r\n%@",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) {
        NSLog(@"connect successs");
        
        NSHTTPURLResponse *urlResponese = nil;
        NSError *error;
        NSData* resultData = [NSURLConnection sendSynchronousRequest:request   returningResponse:&urlResponese error:&error];
        
        NSString* result= [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];
        NSLog(@"error=%@",[error localizedFailureReason]);
        NSLog(@"返回结果=====%@ resuct code=%d ",result,[urlResponese statusCode]);
        
        return result;
    }
    
    return nil;

}

 调用的方式如下:
NSMutableDictionary *pa = [NSMutableDictionary dictionaryWithCapacity:1];
    [pa setValue:@"view1.jpg" forKey:@"pic"];
    [pa setValue:@"view1" forKey:@"field1"];
    //[pa setValue:@"jpeg" forKey:@"format"];
    NSString* result = [具体类 uploadImage: urlstring param:pa format:@"image/jpeg"];
    NSLog(@"result = %@",result);

第一个参数为上传服务器的ip地址字符串,第2个参数为body值参数,根据具体情况可能有所不同,第3个参数为上传图片的格式。

   

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