JSONObject optString与getString的区别

getString(String name)与optString(String name)，功能一样，只是当无返回值时，getString(String name)抛出错误，optString(String name)返回空值

• getString(String name)

Returns the value mapped by name if it exists, coercing it if necessary, or throws if no such mapping exists.

• optString(String name)

Returns the value mapped by name
if it exists, coercing it if necessary, or the empty string if no such mapping exists.