ASIHTTPRequest类库中的ASIFormDataRequest是实现HTTP协议中的处理POST表单的很好的类库。使用起来非常简单。
在说明之前先需要了解HTTP请求的Get和Post方法。
Get方法一般是从服务器获取数据,而Post方法主要是向服务器传输一些数据。
Get是把参数数据队列加到提交表单的ACTION属性所指的URL中，值和表单内各个字段一一对应，在URL中可以看到完整的URL请求。ASIHTTPRequest类主要完成Get请求。
Post方法是将表单内各个字段与其内容放置在HTML HEADER内传送到ACTION属性所指的URL地址。用户看不到这个过程。ASIFormDataRequest类主要完成Post请求。
关于ASIHTTPRequest类库的安装配置详见《ASIHTTPRequest的环境配置和使用示例》
1,构造请求
需要包含头文件:#import "ASIFormDataRequest.h"
ASIFormDataRequest *request;
request=[ASIFormDataRequest requestWithURL:[NSURL URLWithString:@"http://www.tekuba.net"]];
//构造请求
[request setPostValue:emailFiled.text forKey:@"Mail"];
[request setPostValue:accountFiled.text forKey:@"UserAccount"];//帐户
[request setPostValue:[self md5:passwordFiled.text] forKey:@"PassWord"];//密码
[request setDelegate:self];
//配置代理为本类
[request setTimeOutSeconds:10];
//设置超时
[request setDidFailSelector:@selector(urlRequestFailed:)];
[request setDidFinishSelector:@selector(urlRequestSucceeded:)];
[request startSynchronous];//同步传输
//[request startAsynchronous];//异步传输
2,实现数据处理方法
//连接失败
-(void)urlRequestFailed:(ASIHTTPRequest *)request
{
NSError *error =[request error];
NSLog(@"%@",error);
NSLog(@"连接失败！");
UIAlertView * alt=[[UIAlertView alloc] initWithTitle:@"提示" message:@"连接失败" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alt show];
[alt release];
}
//请求成功
-(void)urlRequestSucceeded:(ASIHTTPRequest *)request
{
NSData *data=[request responseData];
NSXMLParser *parser=[[NSXMLParser alloc] initWithData:data];
NSLog(@"data length = %d",[data length]);
NSLog(@"xml data = %@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
[parser setDelegate:self];
[parser parse];//进入解析
}
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实例：
IPhone之ASIFormDataRequest POST操作架构设计
//开启iphone网络开关
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
ASIFormDataRequest *request = [[ASIFormDataRequest alloc] initWithURL:[NSURL URLWithString:host]];
//超时时间
request.timeOutSeconds = 30;
//定义异步方法
[request setDelegate:self];
[request setDidFailSelector:@selector(requestDidFailed:)];
[request setDidFinishSelector:@selector(requestDidSuccess:)];
//用户自定义数据 字典类型 （可选）
request.userInfo = [NSDictionary dictionaryWithObject:method forKey:@"Method"];
//post的数据
[request appendPostData:[body dataUsingEncoding:NSUTF8StringEncoding]];
//开始执行
[request startAsynchronous];
//执行成功
- (void)requestDidSuccess:(ASIFormDataRequest *)request
{
//获取头文件
NSDictionary *headers = [request responseHeaders];
//获取http协议执行代码
NSLog(@"Code:%d",[request responseStatusCode]);
if ([delegate respondsToSelector:@selector(OARequestSuccessed:withResponse:WithData:withHeaders:)])
{
//执行委托操作 （架构设计 自选）
[delegate OARequestSuccessed:method withResponse:[request responseString] WithData:[request responseData] withHeaders:headers];
}
//清空
if (request)
{
[request release];
}
//关闭网络
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
｝
//执行失败
- (void)requestDidFailed:(ASIFormDataRequest *)request{
//获取的用户自定义内容
NSString *method = [request.userInfo objectForKey:@"Method"];
//获取错误数据
NSError *error = [request error];
if ([delegate respondsToSelector:@selector(OARequestFailed:withError:)])
{
//执行委托 将错误数据传其他方式（架构设计 自选）
[delegate OARequestFailed:method withError:error];
}
if (request)
{
[request release];
}
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO
}
//执行成功函数
- (void)OARequestSuccessed:(NSString *)method withResponse:(NSString *)response WithData:(NSData *)data withHeaders:(NSDictionary *)headers
{
NSString *responseStr = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
//服务返回post后的数据
NSLog(@"response:
%@",responseStr);
}
//执行失败函数
- (void)OARequestFailed:(NSString *)method withError:(NSError *)error
{
NSLog(@"Error:%@",error);
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"出错了" message:@"网络连接失败, 请稍后重试." delegate:nil cancelButtonTitle:@"好的" otherButtonTitles:nil];
[alert show];
[alert release];
}