<?php    $q = mysql_connect("localhost","root","");    if(!$q)    {       die(‘Could not connect:  ‘ . mysql_error());    }    mysql_query("set names utf8"); //以utf8读取数据    mysql_select_db("jasontest",$q); //数据库    $sql = "select * from userinfo";    $query = mysql_query($sql);    while($row = mysql_fetch_array($query)){                    $com= $row;                }    echo json_encode($com);?>

- (IBAction)clickbutton:(id)sender {    [NSThread detachNewThreadSelector:@selector(getjasonstring) toTarget:self withObject:nil];}-(void)getjasonstring{    NSError *error;    //加载一个NSURL对象    NSURLRequest *request2 = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost/jasontest/connect.php"]];    //将请求的url数据放到NSData对象中    NSData *response = [NSURLConnection sendSynchronousRequest:request2 returningResponse:nil error:nil];    //IOS5自带解析类NSJSONSerialization从response中解析出数据放到字典中    NSDictionary *jasonDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];    NSLog(@"person‘s userid is %@",[jasonDic objectForKey:@"userid"]);    NSLog(@"person‘s name is %@",[jasonDic objectForKey:@"name"]);    NSLog(@"person‘s password is %@",[jasonDic objectForKey:@"password"]);    NSLog(@"person‘s phoneNo is %@",[jasonDic objectForKey:@"phoneNo"]);    }