ASI中POST请求和文件下载

//POST请求
 1 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
 {
     // 1.URL
     NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/login"];

     // 2.创建一个请求对象
     ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];

     // 3.设置请求参数(建议使用setPostValue多一点)
     [request setPostValue:@"" forKey:@"username"];
     [request setPostValue:@"" forKey:@"pwd"];

     // 4.开始请求
     [request startAsynchronous];

     // 5.设置监听方法
     __weak typeof(request) weakRequest = request;
     [request setCompletionBlock:^{
         NSLog(@"请求完毕--%@", [weakRequest responseString]);
     }];
 }

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