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Java 使用安卓系统发布HTTP帖子-“;println需要一条消息;错误_Java_Android_Json_Http Post - Fatal编程技术网

Java 使用安卓系统发布HTTP帖子-“;println需要一条消息;错误

Java 使用安卓系统发布HTTP帖子-“;println需要一条消息;错误,java,android,json,http-post,Java,Android,Json,Http Post,这是我的活动,我想用JSON格式的数据发送Post请求 public class OrderActivity extends Activity { List<Piatto> ordine = new ArrayList<Piatto>(); Context context; @Override public void onCreate(Bundle savedInstanceState) {

这是我的活动,我想用JSON格式的数据发送Post请求

public class OrderActivity extends Activity {


        List<Piatto> ordine = new ArrayList<Piatto>();
        Context context;


        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.order_layout);




                TextView disptext = (TextView) findViewById(R.id.dispid);


                ordine = getIntent().getParcelableArrayListExtra("ordinelist");

                context = getApplicationContext();




                String json = "";
                Integer contatore = 0;
                for (Integer i = 0; i < ordine.size(); i++) { 
                    if (ordine.get(i) != null){
                        if (contatore > 0){
                            json = json+", ";
                        }
                        json = json+ordine.get(i).getJSON();

                    }
                }
                disptext.setText(json);

                POST("http://some.altervista.org/order.php", json);

                }



        public static String POST(String url, String json){
            InputStream inputStream = null;
            String result = "";
            try {

                // 1. create HttpClient
                HttpClient httpclient = new DefaultHttpClient();

                // 2. make POST request to the given URL
                HttpPost httpPost = new HttpPost(url);


                // 5. set json to StringEntity
                StringEntity se = new StringEntity(json);

                // 6. set httpPost Entity
                httpPost.setEntity(se);

                // 7. Set some headers to inform server about the type of the content   
                httpPost.setHeader("Accept", "application/json");
                httpPost.setHeader("Content-type", "application/json");

                // 8. Execute POST request to the given URL
                HttpResponse httpResponse = httpclient.execute(httpPost);


            } catch (Exception e) {
                Log.d("InputStream", e.getLocalizedMessage());
            }

            // 11. return result
            return result;
        }


}
你对此有什么想法吗?我没有关于println的直接代码。 或者你对实施这样的计划还有其他建议吗


非常感谢

这个问题也与内部调用println的Log类有关。例如,你有

Log.d("InputStream", e.getLocalizedMessage());

如果
e.getLocalizedMessage()
返回,您的应用程序将崩溃,出现异常情况

println由log.d调用,您调用它。看看stacktrace。您的异常没有本地化消息。这不是记录异常的好方法,应该改用printStackTrace。您可能会看到它是一个networkonmainthreadexception,这在很大程度上已经有文档记录了。也不要犹豫,直接从您喜欢的IDE使用调试工具。您知道为什么它不发送有效的http请求吗?非常感谢,
networkonMainthreadExecution
可能导致应用程序崩溃。尝试打印
Log.d(“InputStream”,“Error”,e)
e.printStackTrace()
以查看故障的真正原因exception@Blackbelt你能告诉我为什么你把我的问题标为重复的吗。在这样做之前,你必须先解决这个问题。你只是看了一下logcat并将其标记为重复。但我的问题有一个不同的问题。你可以建议我看看这个问题。我会很感激的
Log.d("InputStream", e.getLocalizedMessage());