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。

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1. 1. 
      
2. Content-Type: multipart/form-data; boundary=${bound}
   1. 
      

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1. 1. 
      
2. Content-Type: application/json
   1. 
      

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

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1. 1. 
      
2. //分界线的标识符
3. NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";
4. //根据url初始化request
5. NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
6. cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
7. timeoutInterval:10];
8. //分界线 --AaB03x
9. NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];
10. //结束符 AaB03x--
11. NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];
12. //要上传的图片
13. UIImage *image=[params objectForKey:@"pic"];
14. //得到图片的data
15. NSData* data = UIImagePNGRepresentation(image);
16. //http body的字符串
17. NSMutableString *body=[[NSMutableString alloc]init];
18. //参数的集合的所有key的集合
19. NSArray *keys= [params allKeys];
20. 
    
21. //遍历keys
22. for(int i=0;i<[keys count];i++)
23. {
24. //得到当前key
25. NSString *key=[keys objectAtIndex:i];
26. //如果key不是pic，说明value是字符类型，比如name：Boris
27. if(![key isEqualToString:@"pic"])
28. {
29. //添加分界线，换行
30. [body appendFormat:@"%@\r\n",MPboundary];
31. //添加字段名称，换2行
32. [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];
33. //添加字段的值
34. [body appendFormat:@"%@\r\n",[params objectForKey:key]];
35. }
36. }
37. 
    
38. ////添加分界线，换行
39. [body appendFormat:@"%@\r\n",MPboundary];
40. //声明pic字段，文件名为boris.png
41. [body appendFormat:@"Content-Disposition: form-data; name=\"pic\"; filename=\"boris.png\"\r\n"];
42. //声明上传文件的格式
43. [body appendFormat:@"Content-Type: image/png\r\n\r\n"];
44. 
    
45. //声明结束符：--AaB03x--
46. NSString *end=[[NSString alloc]initWithFormat:@"\r\n%@",endMPboundary];
47. //声明myRequestData，用来放入http body
48. NSMutableData *myRequestData=[NSMutableData data];
49. //将body字符串转化为UTF8格式的二进制
50. [myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];
51. //将image的data加入
52. [myRequestData appendData:data];
53. //加入结束符--AaB03x--
54. [myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];
55. 
    
56. //设置HTTPHeader中Content-Type的值
57. NSString *content=[[NSString alloc]initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];
58. //设置HTTPHeader
59. [request setValue:content forHTTPHeaderField:@"Content-Type"];
60. //设置Content-Length
61. [request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];
62. //设置http body
63. [request setHTTPBody:myRequestData];
64. //http method
65. [request setHTTPMethod:@"POST"];
66. 
    
67. //建立连接，设置代理
68. NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
69. 
    
70. //设置接受response的data
71. if (conn) {
72. mResponseData = [[NSMutableData data] retain];
73. }
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二、JSON上传图片

1. 1. //根据url初始化request
   2. NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]
   3. cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
   4. timeoutInterval:10];
   5. 
      
   6. //要上传的图片
   7. UIImage *image=[params objectForKey:@"pic"];
   8. //得到图片的data
   9. NSData* data = UIImagePNGRepresentation(image);
   10. //base64编码
   11. NSString *photoStr = [data base64Encoding];
   12. 
       
   13. //参数字典
   14. NSDictionary *params = [[NSDictionary alloc] init];
   15. [params setObject:@{@"avatar": photoStr} forKey:@"profile"];
   16. NSData *myRequestData = [NSMutableData dataWithData:[NSJSONSerialization dataWithJSONObject:params options:NSJSONWritingPrettyPrinted error:nil]];
   17. 
       
   18. //设置http header
   19. [request.request setValue:@"application/json" forHTTPHeaderField:@"Content-type"];
   20. [request.request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
   21. 
       
   22. //设置http body
   23. [request setHTTPBody:myRequestData];
   24. //http method
   25. [request setHTTPMethod:@"POST"];
   26. 
       
   27. //建立连接，设置代理
   28. NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
   29. 
       
   30. //设置接受response的data
   31. if (conn) {
   32. mResponseData = [[NSMutableData data] retain];
   33. }
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