1. [代码]JSON解析的两个函数     跳至 //optJSONObject源码解析： /** * Returns the value mapped by {@code name} if it exists and is a {@code * JSONObject}. Returns null otherwise. */ public JSONObject optJSONObject(String name) { Object object = opt(name); return object instanceof JSONObject ? (JSONObject) object : null; } //当返回值不是JSONObject对象时，返回值为null，不抛出异常; //getJSONObject源码解析： /** * Returns the value mapped by {@code name} if it exists and is a {@code * JSONObject}. * @throws JSONException if the mapping doesn't exist or is not a {@code * JSONObject}. */ public JSONObject getJSONObject(String name) throws JSONException { Object object = get(name); if (object instanceof JSONObject) { return (JSONObject) object; } else { throw JSON.typeMismatch(name, object, "JSONObject"); } } //当返回值不是JSONObject对象时，抛出异常;