时间：2022-10-09 15:33:38 | 栏目：Android代码 | 点击：次
optString方法会在对应的key中的值不存在的时候返回一个空字符串，但是getString会抛一个JSONException 。
/**
* Returns the value mapped by {@code name} if it exists, coercing it if
* necessary, or throws if no such mapping exists.
*
* @throws JSONException if no such mapping exists.
*/
public String getString(String name) throws JSONException {
Object object = get(name);
String result = JSON.toString(object);
if (result == null) {
throw JSON.typeMismatch(name, object, "String");
}
return result;
}
/**
* Returns the value mapped by {@code name} if it exists, coercing it if
* necessary, or the empty string if no such mapping exists.
*/
public String optString(String name) {
return optString(name, "");
}