如何解决java.lang.String无法转换为JSON对象的问题? [英] How do I solved java.lang.String cannot converted to JSON object?

问题描述

我对android和MySQL抱有宽容，并且对此网站有看法:

I have lerant about android and MySQL, and I have view about this web:http://codeoncloud.blogspot.tw/2013/07/android-mysql-php-json-tutorial.html

但是我不知道如何解决这个问题: 在此处输入图片描述

but I don't know how to solve this problem: enter image description here

<?php  
$host="sql113.byethost14.com"; //replace with database hostname 
$username=" xxx  "; //replace with database username 
$password=" xxx  "; //replace with database password 
$db_name="b14_16972597_food"; //replace with database name

$con=mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");
$sql = "select * from emp_info"; 
$result = mysql_query($sql);
$json = array();

if(mysql_num_rows($result)){
while($row=mysql_fetch_assoc($result)){
$json['emp_info'][]=$row;
}
}
mysql_close($con);
echo json_encode($json);  
?>

推荐答案

您可以通过返回有效的JSON字符串来解决此问题.

You solve this by returning a valid JSON string.

您可以使用服务来检查其有效性:

You can use a service to check its validity:

http://jsonlint.com/

您的脚本应返回JSON，并且仅返回JSON字符串.

Your script should return JSON and only a JSON string nothing else.

要在您的应用中对此进行调试，您应该记录该字符串并检查它，甚至尝试将其转换为JSON.

To debug this in your app you should log the string and check it before even attempting to convert it JSON.

这篇关于如何解决java.lang.String无法转换为JSON对象的问题?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！