实现一个简单的http请求工具类

OC自带的http请求用起来不直观，asihttprequest库又太大了，依赖也多，下面实现一个简单的http请求工具类

四个文件源码大致如下，还有优化空间

MYHttpRequest.h（类定义，类目定义）

#import <Foundation/Foundation.h>

@class MYHttpResponse;

@interface MYHttpRequest : NSObject
{
@private
    NSString *url;
    NSString *method;

    NSMutableDictionary *reqHeaders;
    NSMutableDictionary *postForms;
    NSMutableDictionary *postFiles;
}

-(MYHttpResponse *)get:(NSString *)url;
-(MYHttpResponse *)post:(NSString *)url;

@end

@interface MYHttpRequest (Create)

-(id)init;
-(void)dealloc;

@end

@interface MYHttpRequest (Config)

-(void)setUrl:(NSString *)_url;
-(void)setMethod:(NSString *)_method;
-(void)setReqHeaders:(NSDictionary *)_rheaders;
-(void)setPostForms:(NSDictionary *)_pforms;
-(void)setPostFiles:(NSDictionary *)_pfiles;

-(void)addHeaderName:(NSString *)headerName Value:(NSString *)headerValue;
-(void)addFormName:(NSString *)formName Value:(NSString *)formValue;
-(void)addFileFieldName:(NSString *)fieldName Data:(NSString *)filePath;

@end

MYHttpRequest.m（类实现，类目实现，延展实现私有方法）

#import "MYHttpRequest.h"
#import "MYHttpResponse.h"

@interface MYHttpRequest ()

-(NSURLRequest *)buildRequest;
-(MYHttpResponse *)sendRequest:(NSURLRequest *)req;

@end

@implementation MYHttpRequest

-(MYHttpResponse *)get:(NSString *)_url
{
    [self setUrl:_url];
    [self setMethod:@"GET"];

    NSURLRequest *req = [self buildRequest];
    return [self sendRequest:req];
}
-(MYHttpResponse *)post:(NSString *)_url
{
    [self setUrl:_url];
    [self setMethod:@"POST"];

    NSURLRequest *req = [self buildRequest];
    return [self sendRequest:req];
}

-(NSURLRequest *)buildRequest
{
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:url]];

    if([[method uppercaseString] isEqualToString:@"GET"]){
        [request setHTTPMethod:@"GET"];
        return request;
    }

    [request setHTTPMethod:@"POST"];

    NSArray *keys;

    NSString *boundary = [NSString stringWithFormat:@"---------------------------%f",[[NSDate date] timeIntervalSince1970]];
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

    NSMutableData *postData = [NSMutableData data]; 

    //Append Header
    keys = [reqHeaders allKeys];
    for (NSString *_key in keys)
    {
        [request addValue:[reqHeaders objectForKey:_key] forHTTPHeaderField: _key];
    }

    //Append Post Forms
    keys = [postForms allKeys];
    for (NSString *_key in keys)
    {
        [postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n", _key] dataUsingEncoding:NSUTF8StringEncoding]];
        [postData appendData:[[NSString stringWithString:@"Content-Type: text/plain\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [postData appendData:[[NSString stringWithFormat:@"%@", [postForms objectForKey:_key]] dataUsingEncoding:NSUTF8StringEncoding]];
    }

    // Append the Files
    keys = [postFiles allKeys];
    for (NSString *_key in keys)
    {
        NSString *filePath = [postFiles objectForKey:_key];

        [postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"fileupload\"; filename=\"%@\"\r\n", filePath]dataUsingEncoding:NSUTF8StringEncoding]];
        [postData appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

        NSData *photo = [[NSFileManager defaultManager] contentsAtPath:filePath];
        [postData appendData:[NSData dataWithData:photo]];
    }

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

    // Append
    [request setHTTPBody:postData];

    return request;
}

-(MYHttpResponse *)sendRequest:(NSURLRequest *)req
{
    MYHttpResponse *myresponse = nil;

    NSURLResponse *response;
    NSError *error = nil;
    NSData *responseData = [NSURLConnection sendSynchronousRequest:req returningResponse:&response error:&error];
    if (error) {
        NSLog(@"Something wrong: %@",[error description]);
    }else {
        NSString *responseString = nil;
        if (responseData) {
            responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
        }
        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
        NSInteger statusCode = [httpResponse statusCode];
        NSDictionary *responseHeaders = [httpResponse allHeaderFields];

        myresponse = [[MYHttpResponse alloc] initWithCode:statusCode Headers:responseHeaders Body:responseString];

        [responseString release];
    }
    [myresponse autorelease];

    return myresponse;
}

@end

@implementation MYHttpRequest (Create)

-(id)init
{
    if (self=[super init]) {
        url = [[NSString alloc] init];
        method = [[NSString alloc] init];

        reqHeaders = [[NSMutableDictionary alloc] init];
        postForms = [[NSMutableDictionary alloc] init];
        postFiles = [[NSMutableDictionary alloc] init];
    }
    return self;
}

-(void)dealloc
{
    [url release];
    [method release];

    [reqHeaders release];
    [postForms release];
    [postFiles release];

    [super dealloc];
}

@end

@implementation MYHttpRequest (Config)

-(void)setUrl:(NSString *)_url
{
    if(url != _url)
    {
        [url release];
        url = [_url retain];
    }
}
-(void)setMethod:(NSString *)_method
{
    if(method != _method)
    {
        [method release];
        method = [_method retain];
    }
}
-(void)setReqHeaders:(NSMutableDictionary *)_rheaders
{
    if(reqHeaders != _rheaders)
    {
        [reqHeaders release];
        reqHeaders = [_rheaders retain];
    }
}
-(void)setPostForms:(NSMutableDictionary *)_pforms
{
    if(postForms != _pforms)
    {
        [postForms release];
        postForms = [_pforms retain];
    }
}
-(void)setPostFiles:(NSMutableDictionary *)_pfiles
{
    if(postFiles != _pfiles)
    {
        [postFiles release];
        postFiles = [_pfiles retain];
    }
}

-(void)addHeaderName:(NSString *)headerName Value:(NSString *)headerValue
{
    [reqHeaders setValue:headerValue forKey:headerName];
}
-(void)addFormName:(NSString *)formName Value:(NSString *)formValue
{
    [postForms setValue:formValue forKey:formName];
}
-(void)addFileFieldName:(NSString *)fieldName Data:(NSString *)filePath
{
    [postFiles setValue:filePath forKey:fieldName];
}

@end

MYHttpResponse.h

#import <Foundation/Foundation.h>

@interface MYHttpResponse : NSObject
{
}

@property(nonatomic) NSInteger statusCode;
@property(nonatomic, retain) NSDictionary *responseHeaders;
@property(nonatomic, copy) NSString *responseBody;

@end

@interface MYHttpResponse (Create)

-(id)init;

-(id)initWithCode:(NSInteger)sCode
            Headers:(NSDictionary *)rHeaders
             Body:(NSString *)rBody;

-(id)initWithCode:(NSInteger)sCode
             Body:(NSString *)rBody;

-(id)initWithBody:(NSString *)rBody;

@end

MYHttpResponse.m

#import "MYHttpResponse.h"

@implementation MYHttpResponse

@synthesize statusCode;
@synthesize responseHeaders, responseBody;

@end

@implementation MYHttpResponse (Create)

-(id)init
{
    if (self=[super init]) {
    }
    return self;
}

-(id)initWithCode:(NSInteger)sCode
          Headers:(NSDictionary *)rHeaders
             Body:(NSString *)rBody
{
    if (self=[super init]) {
        statusCode = sCode;

        self.responseHeaders = rHeaders;
        self.responseBody = rBody;
    }
    return self;
}

-(id)initWithCode:(NSInteger)sCode
             Body:(NSString *)rBody
{
    return [self initWithCode:sCode Headers:nil Body:rBody];
}

-(id)initWithBody:(NSString *)rBody
{
    return [self initWithCode: Headers:nil Body:rBody];
}

@end

使用方法如下：

，引用头文件
#import "MYHttpRequest.h"
#import "MYHttpResponse.h"

，发起get请求
MYHttpRequest *request = [[MYHttpRequest alloc] init];
MYHttpResponse *response = [request get:@"http://localhost/get"];

NSLog(@"statuscode:%d",response.statusCode);
NSLog(@"headers:%@",response.responseHeaders);
NSLog(@"body:%@",response.responseBody);

[request release];

，发起post请求(multipart)
MYHttpRequest *request = [[MYHttpRequest alloc] init];
[request addHeaderName:@"Agent" Value:@"xiaomi"];
[request addFormName:@"uid" Value:@""];
MYHttpResponse *response = [request post:@"http://localhost/post"];

NSLog(@"statuscode:%d",response.statusCode);
NSLog(@"headers:%@",response.responseHeaders);
NSLog(@"body:%@",response.responseBody);

[request release];

，通过post请求上传文件
MYHttpRequest *request = [[MYHttpRequest alloc] init];
[request addFileFieldName:@"fileupload1" Data:@"/Users/penjin/Pictures/a.png"];
[request addFileFieldName:@"fileupload2" Data:@"/Users/penjin/Pictures/b.png"];
MYHttpResponse *response = [request post:@"http://localhost/postfile"];

NSLog(@"statuscode:%d",response.statusCode);
NSLog(@"headers:%@",response.responseHeaders);
NSLog(@"body:%@",response.responseBody);

[request release];