Attempt to invoke virtual method ‘int java.lang.String.length()‘

黑暗中的一束光1023

于 2021-12-16 02:13:28 发布

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分类专栏： AS 文章标签： java 开发语言后端

本文链接：https://blog.youkuaiyun.com/qq_43145360/article/details/121965558

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在安卓项目中：
String转JSONObject时出现
java.lang.NullPointerException: Attempt to invoke virtual method ‘int java.lang.String.length()’ on a null object reference
原因：

 int responseCode = httpURLConnection.getResponseCode();
                    if(responseCode == httpURLConnection.HTTP_OK)
                    {
                        InputStream inputStream = httpURLConnection.getInputStream();
                        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                        Log.e("TAG", "run: "+bufferedReader.readLine() );
                        JSONObject jsonstr = new JSONObject(removeBOM(bufferedReader.readLine()));
                        Log.e("result", "run: "+jsonstr.getString("code") );


                    }

bufferedReader.readLine() 在转json前输出，导致空指针

解决办法：
把 Log.e(“TAG”, "run: "+bufferedReader.readLine() );去掉，在转json前不要输出