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cocoahttpserver使用详解(二)
接下来,我们接着去学习如何去接收处理web上传的数据
.m文件
主要的代码就在 processDataChunk,我们只需要在这里面处理数据即可
1 首先我们创建一个
@interface WTZHTTPConnection : HTTPConnection
在这个类中我们用于处理接受文件并存储到app文档
同时不要忘记了设置httpserver的Connectio类
[httpServer setConnectionClass:[WTZHTTPConnectionclass]];
全部的代码如下
.h文件
#define UPLOAD_FILE_PROGRESS @"uploadfileprogress" #import <Foundation/Foundation.h> #import "HTTPConnection.h" @interface WTZHTTPConnection : HTTPConnection { int dataStartIndex; NSMutableArray *multipartData; BOOL postHeaderOK; } - (BOOL) isBeginOfOctetStream; @end
.m文件
#import "WTZHTTPConnection.h" @implementation WTZHTTPConnection - (void)dealloc { [multipartData release]; [super dealloc]; } //扩展HTTPServer支持的请求类型,默认支持GET,HEAD,不支持POST - (BOOL)supportsMethod:(NSString *)method atPath:(NSString *)relativePath { if ([@"POST" isEqualToString:method]) { return YES; } return [super supportsMethod:method atPath:relativePath]; } //处量返回的response数据 - (NSObject<HTTPResponse> *)httpResponseForMethod:(NSString *)method URI:(NSString *)path { return [super httpResponseForMethod:method URI:path]; } //处理POST请求提交的数据流(下面方法是改自 Andrew Davidson的类) - (void)processDataChunk:(NSData *)postDataChunk { NSLog(@"processDataChunk function called"); //multipartData初始化不放在init函数中, 当前类似乎不经init函数初始化 if (multipartData == nil) { multipartData = [[NSMutableArray alloc] init]; } //处理multipart/form-data的POST请求中Body数据集中的表单值域并创建文件 if (!postHeaderOK) { //0x0A0D: 换行符 UInt16 separatorBytes = 0x0A0D; NSData* separatorData = [NSData dataWithBytes:&separatorBytes length:2]; int l = (int)[separatorData length]; for (int i = 0; i < [postDataChunk length] - l; i++) { //每次取两个字节 比对下看看是否是换行 NSRange searchRange = {i, l}; //如果是换行符则进行如下处理 if ([[postDataChunk subdataWithRange:searchRange] isEqualToData:separatorData]) { //获取dataStartIndex标识的上一个换行位置到当前换行符之间的数据的Range NSRange newDataRange = {dataStartIndex, i - dataStartIndex}; //dataStartIndex标识的上一个换行位置到移到当前换行符位置 dataStartIndex = i + l; i += l - 1; //获取dataStartIndex标识的上一个换行位置到当前换行符之间的数据 NSData *newData = [postDataChunk subdataWithRange:newDataRange]; //如果newData不为空或还没有处理完multipart/form-data中表单变量值域则继续处理剩下的表单值域数据 if ([newData length] || ![self isBeginOfOctetStream]) { if ([newData length]) { [multipartData addObject:newData]; } } else { //将标识处理完multipart/form-data中表单变量值域的postHeaderOK变量设置为TRUE; postHeaderOK = TRUE; //这里暂时写成硬编码 弊端:每次增加表单变量都要改这里的数值 //获取Content-Disposition: form-data; name="xxx"; filename="xxx" NSString* postInfo = [[NSString alloc] initWithBytes:[[multipartData objectAtIndex:4] bytes] length:[[multipartData objectAtIndex:4] length] encoding:NSUTF8StringEncoding]; NSLog(@"postInfo is:%@", postInfo); NSArray* postInfoComponents = [postInfo componentsSeparatedByString:@"; filename="]; postInfoComponents = [[postInfoComponents lastObject] componentsSeparatedByString:@"\""]; NSLog(@"postInfoComponents0 :%@",postInfoComponents); if ([postInfoComponents count]<2) { return; } postInfoComponents = [[postInfoComponents objectAtIndex:1] componentsSeparatedByString:@"\\"]; NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSString* filename = [documentPath stringByAppendingPathComponent:[postInfoComponents lastObject]]; NSLog(@"filename :%@",filename); NSRange fileDataRange = {dataStartIndex, [postDataChunk length] - dataStartIndex}; [[NSFileManager defaultManager] createFileAtPath:filename contents:[postDataChunk subdataWithRange:fileDataRange] attributes:nil]; NSFileHandle *file = [[NSFileHandle fileHandleForUpdatingAtPath:filename] retain]; if (file) { [file seekToEndOfFile]; [multipartData addObject:file]; } [postInfo release]; break; } } } } else //表单值域已经处理过了 这之后的数据全是文件数据流 { [(NSFileHandle*)[multipartData lastObject] writeData:postDataChunk]; } float uploadProgress = (double)requestContentLengthReceived / requestContentLength; //实际应用时 当前类的实例是相当于单例一样被引用(因为只被实例化一次) if (uploadProgress >= 1.0) { postHeaderOK = NO; [multipartData release]; multipartData = nil; } [[NSNotificationCenter defaultCenter] postNotificationName:UPLOAD_FILE_PROGRESS object:[NSNumber numberWithFloat:uploadProgress] userInfo:nil]; } //检查是否已经处理完了multipart/form-data表单中的表单变量 - (BOOL) isBeginOfOctetStream { NSString *octetStreamFlag = @"Content-Type: application/octet-stream"; NSString *findData = [[NSString alloc] initWithData:(NSData *)[multipartData lastObject] encoding:NSUTF8StringEncoding]; for (NSData *d in multipartData) { NSString *temp = [[[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding] autorelease] ; NSLog(@"multipartData items: %@", temp); } //如果已经处理完了multipart/form-data表单中的表单变量 if ( findData != nil && [findData length] > 0 ) { NSLog(@"findData is :%@\n octetStreamFlag is :%@", findData, octetStreamFlag); if ([octetStreamFlag isEqualToString:findData]) { NSLog(@"multipart/form-data 变量值域数据处理完毕"); [findData release]; return YES; } [findData release]; return NO; } return NO; } @end
主要的代码就在 processDataChunk,我们只需要在这里面处理数据即可
以上代码主要转自github上 https://github.com/willonboy/CocoaHTTPServer---multipart-form-data点击打开链接
大家可以下载源码研究
下章将要讲解 web js代码
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