java - Objective C iOS 中文件上传图像文件代码

Question

我是 iOS 应用程序开发新手，我只想使用 NSMutableURLRequest 上传图像文件。请求正文应包含在图像中。我只想将如下图像作为java代码发送

 HttpPut mCreatePost = new HttpPut(params[0]+"/data");
 FileEntity fileEntity = new FileEntity(uploadFile, "image/jpeg");
 mCreatePost.setEntity(fileEntity);
 mHttpClient.execute(mCreatePost);

请帮我写一下上面的 Objective C 代码。提前致谢。

Answer 1

流程

1. 创建 NSMutableURLRequest
2. 设置 NSMutableURLRequest 的 URL
3. 为 NSMutableURLRequest 设置 HTTP 方法
4. 为 NSMutableURLRequest 设置 header 字段
5. 为 NSMutableURLRequest 设置 HTTP 正文。这将包括图像文件和任何其他参数(下面的示例代码)
6. 初始化先前声明的 NSMutableData 对象。这用于存储来自服务器的响应(下面的示例代码)
7. 初始化先前声明的 NSURLConnection 对象并设置其委托(delegate)。在示例代码中，我创建了与委托(delegate)相同的类并实现了委托(delegate)方法。

示例代码

- (void)uploadImage    
    NSString *urlStr = @"your link to the server";

        NSMutableURLRequest *urlRequest = [[[NSMutableURLRequest alloc] init] autorelease];
        [urlRequest setURL:[NSURL URLWithString:urlStr]];

        [urlRequest setHTTPMethod:@"POST"];

        NSString *myboundary = [NSString stringWithFormat:@"---------------------------14737809831466499882746641449"];
        NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",myboundary];
        [urlRequest addValue:contentType forHTTPHeaderField: @"Content-Type"];

        NSMutableData *postData = [NSMutableData data];

        NSString *filePath = @"path to file you want to upload";

            NSData *zipData = [NSData dataWithContentsOfFile:filePath];
            if(zipData != nil){
                [postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", myboundary] dataUsingEncoding:NSUTF8StringEncoding]];
                [postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@\"\r\n", @"file.zip"]dataUsingEncoding:NSUTF8StringEncoding]];
                [postData appendData:[[NSString stringWithFormat:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
                [postData appendData:[NSData dataWithData:zipData]];
            }


        NSString *params =@"Any other parameters you want to send with the file";

            NSLog(@"%@",params);
            [postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", myboundary] dataUsingEncoding:NSUTF8StringEncoding]];
            [postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", @"params"] dataUsingEncoding:NSUTF8StringEncoding]];
            [postData appendData:[[NSString stringWithFormat:@"%@", params] dataUsingEncoding:NSUTF8StringEncoding]];


        [postData appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", myboundary] dataUsingEncoding:NSUTF8StringEncoding]];

        [urlRequest setHTTPBody:postData];

        [urlRequest setValue:[SettingsDataStore getSharedInstance].cooike forHTTPHeaderField:@"Cookie"];

        responsedata = [[NSMutableData alloc] initWithData:nil];
        conn =  [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];

    }

    //NSURLConnection Delegate

    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        [responsedata appendData:data];
    }
    - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
        NSLog(@"error occured %@", [error localizedDescription]);
        [responseData release];
        [conn release];


    }

    - (void)connectionDidFinishLoading:(NSURLConnection *)connection {

        //Do something with responseData and release it

        [responseData release];
        [conn release];

    }