POST請求之表單上傳圖片

表單上傳:

表單上傳一般是用于上傳大型文件給服務(wù)器，比如圖片、視頻、音頻等，由于服務(wù)器在接收內(nèi)容的時候需要組合成類似于表格的形式，因此在上傳大型文件給服務(wù)器的時候就需要用到表單上傳的方式上傳內(nèi)容，而在上傳大型文件的時候采用POST形式長傳

相關(guān)說明:

在客戶端拼接表單格式的時候，首先應(yīng)聲明表單的分割線，然后才能上傳，聲明分割符在“請求頭”中添加，格式如下：

下面示例中name所對應(yīng)的是key值
lng對應(yīng)的值是key值
分隔符號是--OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp

拼接后的格式類似于

示例:

通過表單上傳格式上傳數(shù)據(jù)給服務(wù)器，格式如下：http://m.goufang.com/api/ershou/eshonglist
--0xKhTmLbOuNdArY
Content-Disposition: form-data; name="cityid"

dl
--0xKhTmLbOuNdArY
Content-Disposition: form-data; name="page"

1
--0xKhTmLbOuNdArY--

示例代碼:

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@protocol ConnectModelDelegate <NSObject>

- (void)connectFinished:(NSData *)data;

@end

@interface ConnectModel : NSObject<NSURLConnectionDataDelegate>
{
    int classIsa;
}
@property (nonatomic, assign) id<ConnectModelDelegate>delegate;

@property (nonatomic, retain) NSMutableData *receiveData;
- (void)startConnection:(NSString *)str parmaters:(NSDictionary *)parmaters;

+ (ConnectModel *)connectWithUrl:(NSString *)url delegate:(id<ConnectModelDelegate>)delegate parmaters:(NSDictionary *)parmaters;
@property (nonatomic, copy) NSString *requestUrl;

@end

#import "ConnectModel.h"
#import <objc/runtime.h>
#import <Foundation/NSObjCRuntime.h>

@implementation ConnectModel

+ (ConnectModel *)connectWithUrl:(NSString *)url delegate:(id<ConnectModelDelegate>)delegate parmaters:(NSDictionary *)parmaters
{
        ConnectModel *model = [[ConnectModel alloc] init];
        model.delegate = delegate;
        [model startConnection:url parmaters:parmaters];
        return model;
    
}

- (void)startConnection:(NSString *)str parmaters:(NSDictionary *)parmaters
{
    NSString *delegateDescription = [[self.delegate class] description];
    classIsa = (int)objc_getClass([delegateDescription UTF8String]);
    
    // 異步網(wǎng)絡(luò)連接
    NSString *string = [str stringByAppendingString:[parmaters objectForKey:@"cityid"]];
    self.requestUrl = str;
    
    NSString *bodyStr = @"--0xKhTmLbOuNdArY";
    
    bodyStr = [bodyStr stringByAppendingString:@"\r\n"];
    
    bodyStr = [bodyStr stringByAppendingString:@"Content-Disposition: form-data; name=\"cityid\"\r\n\r\n"];
    bodyStr = [bodyStr stringByAppendingString:[parmaters objectForKey:@"cityid"]];
    bodyStr = [bodyStr stringByAppendingString:@"\r\n"];
    bodyStr = [bodyStr stringByAppendingString:@"--0xKhTmLbOuNdArY\r\n"];
    bodyStr = [bodyStr stringByAppendingString:@"Content-Disposition: form-data; name=\"page\"\r\n\r\n"];
    bodyStr = [bodyStr stringByAppendingString:[parmaters objectForKey:@"page"]];
    bodyStr = [bodyStr stringByAppendingString:@"\r\n"];
    bodyStr = [bodyStr stringByAppendingString:@"--0xKhTmLbOuNdArY--"];
    
    
     NSLog(@"%@", str);
    
    
    str = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    
    NSURL *url = [NSURL URLWithString:str];
    
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    [request setHTTPMethod:@"POST"];
    [request setValue:@"multipart/form-data; charset=utf-8; boundary=0xKhTmLbOuNdArY" forHTTPHeaderField:@"Content-Type"];
    
    NSData *data = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];
    
    
    
    [request setHTTPBody:data];
    [NSURLConnection connectionWithRequest:request delegate:self];
    
    //    POST http://m.goufang.com/api/loupan/hometuijian HTTP/1.1
    //Host: m.goufang.com
    //    Proxy-Connection: keep-alive
    //    Content-Type: multipart/form-data; charset=utf-8; boundary=0xKhTmLbOuNdArY
    //    Content-Length: 162
    //Connection: keep-alive
    //Cookie: ASP.NET_SessionId=khkjhvak2mobhfi34pgdaqc5
    //    User-Agent: Paros/3.2.13
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    self.receiveData = [NSMutableData data];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [_receiveData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding (kCFStringEncodingGB_18030_2000);
    NSString *value = [[NSString alloc] initWithData:_receiveData encoding:enc];
    
    NSData *data = [value dataUsingEncoding:NSUTF8StringEncoding];
    NSLog(@"value = %@", value);
    [self.delegate connectFinished:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"error = %@", error);
}

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController


@end

#import "ViewController.h"
#import "ConnectModel.h"
@interface ViewController ()

@end

@implementation ViewController
- (IBAction)request:(id)sender {
    
     [ConnectModel connectWithUrl:@"http://m.goufang.com/api/ershou/eshonglist" delegate:nil parmaters:@{@"cityid":@"dl", @"page":@"1"}];
    
}

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}
@end

注意:

表單上傳必須嚴(yán)格按照http的規(guī)定格式去拼接url!!