Iphone HTTP请求工具类详解

在项目中我封装了个http请求的工具类，因为项目中只用到post请求，所以get请求的方法只是刚开始试了下，行得通，不知到有没有错误，代码如下：
h文件：
[cpp]
#import <Foundation/Foundation.h>

/*
*自定义http代理
*/
@protocol MyhttpUitlDelegate <NSObject>
-(void) setServicereturnData:(NSString*)servicedata;
@end

@inte易做图ce MyHTTPUtil : NSObject<NSXMLParserDelegate> {
    NSMutableData *webData;//异步请求返易做图来的数据

    id<MyhttpUitlDelegate> myhttputildelegate;
    NSString *dialogcanshow;//防止快速两次请求以上弹出多个等待对话筐

    //等待对话筐
    UIAlertView *mt;
}

@property(nonatomic,retain)id<MyhttpUitlDelegate> myhttputildelegate;
@property(nonatomic,retain)UIAlertView *mt;
@property(nonatomic,retain) NSString *dialogcanshow;//防止快速两次请求以上弹出多个等待对话筐

+(NSString *)httpForTongbuGET:(NSString *)urlstring;
+(NSString *)httpForTongbuPOST:(NSString *)urlstring addParms:(NSData *)urlparms;
//-(void)httpForYibuPOST:(NSString *)urlstring addParms:(NSString *)urlparms;
-(void)httpForYibuPOSTForData:(NSString *)urlstring addParms:(NSData *)urlparms;
-(void)httpForYibuGET:(NSString *)urlstring addParms:(NSString *)urlparms;
-(void)httpForYibuPOSTPageparms:(NSString *)urlstring addParms:(NSData *)pageparms;
-(void)showwaitalertview;

@end

m文件
[cpp]
#import "MyHTTPUtil.h"
#import "FileUtils.h"

@implementation MyHTTPUtil
//url公用部分
//NSString *baseurl = @"http://192.168.0.63:8080/mbtravel/";
//NSString *baseurl = @"http://192.168.0.63:8081/mbtr/";
NSString *baseurl = @"http://192.168.128.1:8080/mbtravel/";
NSInteger PagingRows = 5;//每页的行数
@synthesize myhttputildelegate;
@synthesize dialogcanshow;
@synthesize mt;

-(void)dealloc{
    [myhttputildelegate release];
    [dialogcanshow release];
    [mt release];
    [super dealloc];
}

-(id)init{
    self.dialogcanshow = @"false";
   return [super init];
}

//http的同步get请求，返回服务器返回的数据
+(NSString *)httpForTongbuGET:(NSString *)urlstring{
    NSString *allurl = [NSString stringWithFormat:@"%@%@",baseurl,urlstring];
    NSURL* url = [NSURL URLWithString:allurl];

    NSMutableURLRequest* request = [[[NSMutableURLRequest alloc]init]autorelease];
    [request setURL:url];
    [request setHTTPMethod:@"GET"];
    NSString *contentType = [NSString stringWithFormat:@"text/xml"];//@"application/json"
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];
    NSHTTPURLResponse *urlResponese = nil;
    NSError *error = [[NSError alloc]init];
    NSData* data = [NSURLConnection sendSynchronousRequest:request   returningResponse:&urlResponese error:&error];
    NSString* result= [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    if([urlResponese statusCode] >=200&&[urlResponese statusCode]<300){

        return result;
    }
    return nil;
    [error release];
    [result release];
}

//异步get请求
-(void)httpForYibuGET:(NSString *)urlstring addParms:(NSString *)urlparms{
    //    if ([ValueUtils caseEquals:self.dialogcanshow to:@"true"]){
    //        [self showwaitalertview];//弹出等待对话筐
    //    }
    //
    NSString *allurl = [NSString stringWithFormat:@"%@%@%@",baseurl,urlstring,urlparms];
    NSLog(@"%@",allurl);
    NSURL *url = [NSURL URLWithString:allurl];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15];

    [theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    //[theRequest setTimeoutInterval:15];//设置了也是无效
    [theRequest setHTTPMethod:@"GET"];
    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self startImmediately:YES];

    if(theConnection) {
        webData = [[NSMutableData data] retain];

    }
}
//
////异步post请求,带参数
//
//-(void)httpForYibuPOST:(NSString *)urlstring addParms:(NSString *)urlparms{
////    if ([ValueUtils caseEquals:self.dialogcanshow to:@"true"]) {
////        [self showwaitalertview];//弹出等待对话筐
////    }
//
//    NSString *allurl = [NSString stringWithFormat:@"%@%@%@",baseurl,urlstring,urlparms];
//          //NSStringEncoding enc=CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);   //转换编码，包括中文
//   // NSString *allurl2=[allurl stringByAddingPercentEscapesUsingEncoding:enc];
//   NSString *allurl2= [allurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//    NSLog(@"url===%@",allurl2);
//    NSURL *url = [NSURL URLWithString:allurl2];
//    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15];
//    [theRequest setValue:@"zh-cn" forHTTPHeaderField:@"Accept-Language"];
//      [th

补充：移动开发 , IOS ,