上传文件的API(参考)

这个API是用来上传文件的,具体项目具体分析.
项目例子:

// 如果未上传则调用接口上传
    NSData * fileData = [[NSData alloc] initWithContentsOfFile:path];
    if (!fileData) {
        return nil;
    }
    // 上传成功,返回服务器的URLStr
    NSInteger errorCode = 0;
    NSString * fileURI = [CMDataRequestProtocol uploadFileData:fileData
                                                  withFileName:@"uploadPic"
                                                   withFileExt:@"jpg"
                                                 withErrorCode:&errorCode];

    if (errorCode) {
        return nil;
    }else{
        if (!fileURI) {
            fileURI = @"";
        }
        return fileURI;
    }

上传文件的方法

/**
 *  @method + (NSString *)uploadFileData:(NSData *)fileData withErrorCode:(NSInteger *)errorCode
 *
 *  @abstract 上传文件
 *
 *  @param fileData   文件数据
 *  @param errorCode  [out]错误代码
 *
 *  @return 如果上传成功则返回资源路径
 */
+ (NSString *)uploadFileData:(NSData *)fileData
                withFileName:(NSString *)fileName
                 withFileExt:(NSString *)fileExt
               withErrorCode:(NSInteger *)errorCode
{
    NSMutableString * uploadFileURL = [[NSMutableString alloc] initWithCapacity:20];
    [uploadFileURL appendFormat:@"http://%@/upload_file",UPLOAD_HOST];
    [uploadFileURL appendFormat:@"?%@",[self getURLSuffixWithURL]];
    
    //创建Request对象
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:uploadFileURL]];
    [request setHTTPMethod:@"POST"];
    NSMutableData *body = [NSMutableData data];
    
    //设置表单项分隔符
    NSString *boundary = @"---------------------------20140601chrrsmusic1703";
    
    //设置内容类型
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];
    
    //写入图片的内容
    NSString * fileFullName = [NSString stringWithFormat:@"%@.%@",fileName,fileExt];
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n",fileName,fileFullName] dataUsingEncoding:NSUTF8StringEncoding]];
    NSString * contentTypeStr = [NSString stringWithFormat:@"Content-Type: image/%@\r\n\r\n",fileExt];
    [body appendData:[contentTypeStr dataUsingEncoding:NSUTF8StringEncoding]];
    //    NSString * appendDataStr = [[NSString alloc] initWithData:body encoding:NSUTF8StringEncoding];
    //    DELOG(@"appendDataStr: \r\n%@",appendDataStr);
    [body appendData:fileData];
    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    
    //写入尾部内容
    [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    
    [request setHTTPBody:body];
    
    NSHTTPURLResponse *urlResponese = nil;
    NSError *error = [[NSError alloc]init];
    NSData* resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponese error:&error];
    if (!resultData) {
        *errorCode = -1;
        return nil;
    }
    NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:resultData options:NSJSONReadingMutableLeaves error:nil];
    NSInteger statusCode = [[NSString ensureStringFor:[jsonData objectForKey:@"state"]] integerValue];
    *errorCode = statusCode;
    if (statusCode == 402) {
        // 发出需要登录的通知
        dispatch_async(dispatch_get_main_queue(), ^{
            [[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_NEED_LOGINTOKEN
                                                                object:nil];
        });
    }
    
    if (statusCode != 0) {
        *errorCode = statusCode;
        return nil;
    }else{
        NSDictionary * data = [jsonData objectForKey:@"data"];
        if (![data isKindOfClass:[NSDictionary class]]) {
            return nil;
        }else{
            NSString * fileURL = [NSString ensureStringFor:[data objectForKey:@"uri"]];
            return fileURL;
        }
    }
}