网址存在中文转码

 // GET

NSString *strurl = @"http://120.25.226.186:32812/login2?username=(需要转的汉字)&pwd=520it&type=JSON";

//转码

 strurl = [strurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

// POST

 //转码

request.HTTPBody = [@"username=(需要转的汉字)&pwd=520it&type=JSON" dataUsingEncoding:NSUTF8StringEncoding ];