将图像从 iOS 上传到 Grails

Question

我一直在努力将图像从我的 iOS 应用程序上传到我的 Grails 后端，但没有成功。在与另一位开发人员（间接）交谈后，建议我将内容类型从多部分/表单数据更改为多部分/二进制。 Objective-C 代码是在查看了大量示例后编写的。

请求正在由控制器处理，但是当我尝试访问请求中的文件 (request.fileName('imageToAttach')) 时，我得到一个空值。

以下是我的应用程序的三个部分（后端和客户端）。有人看到我可能做错了什么吗？

+ (BOOL)uploadImage:(UIImage *)image withName:(NSString *)fileName toURL:(NSURL *)url {
// url points to /my/uploadImage which is the uploadImage action in MyController
NSData *imageData = UIImageJPEGRepresentation(image, 100);
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
[request setHTTPMethod:@"POST"];

NSString *boundary = @"0xOhHaiICanHazB0undary";
NSString *contentType = [NSString stringWithFormat:@"multipart/binary; boundary=%@", boundary];
[request addValue:contentType forHTTPHeaderField:@"Content-Type"];

NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\n--%@--\n",boundary] dataUsingEncoding: NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: binary; name=\"imageToAttach\"; filename=\"%@\"\n",fileName]dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Type: application/octet-stream\n\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:@"\n--%@--\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:body];

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSLog(@"%@",returnString);

return YES;

}

MyController.groovy:

def attachImageToOi = {
println "Uploading image..."
def result
def fileNames = []

if(request.method == 'POST') {
    def imageFile = request.getFile('imageToAttach')
    println imageFile?.inputStream?.text
    if (imageFile && !imageFile.isEmpty()){
        def imagePath = fileUploadService.uploadFile(imageFile, params.imageFileName, "/userFiles")
        if (imagePath != null) {
            fileNames << imagePath
        }
    } else {
        println "Looks like the image file is empty or null..."
    }
} else {
    render "This action only accepts POST"
    return
}

result = [status:200, data:[fileNames:fileNames]]
render result as JSON
return

}

FileUploadService.groovy:

def uploadFile(MultipartFile file, String name, String destinationDirectory) {

def servletContext = ServletContextHolder.servletContext
def storagePath = servletContext.getRealPath(destinationDirectory)

// create storage path directory if it does not exist
def storagePathDirectory = new File(storagePath)
if (!storagePathDirectory.exist()) {
    println "Creating directory: ${storagePath}"
    if (storagePathDirectory.mkdirs()){
        println "success"
    } else {
        println "failed"
    }
}

// store the file
if (!file.isEmpty()) {
    def fullPathToFile = "${storagePath}/${name}"
    file.transferTo(new File(fullPathToFile))
    println "Saved file: ${fullPathToFile}"
    return fullPathToFile
} else {
    println "File ${file.inspect()} was empty!"
    return null
}

}

Answer 1

您的 Obj-C 代码生成的请求似乎存在一些结构问题。以下是一些指示和代码示例： http://lists .apple.com/archives/web-dev/2007/Dec/msg00017.html