The difference is that optString returns the empty string ("") if the key you specify doesn't exist.getString on the other hand throws a JSONException. Use getString if it's an error for the data to be missing, or optString if you're not sure if it will be there.
这个是在stackoverflow上面看到的,mark一下,简单来说就是optString会在得不到你想要的值时候返回空字符串”“,而getString会抛出异常。
[转载]:http://blog.youkuaiyun.com/xuewater/article/details/17221681
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