【问题标题】:IOException closed stream errorIOException 关闭流错误
【发布时间】:2013-01-01 11:03:25
【问题描述】:

我收到错误转换结果java.io.IOException Attempted read on closed stream的错误,这是什么问题??

我的 JSONParsing 类如下:

public class JSONParser {

  static InputStream is = null;
  static JSONObject jObj = null;
  static String json = "";

// constructor
public JSONParser() {

}

// function get json from url
// by making HTTP POST or GET method
public static JSONObject makeHttpRequest(String url, String method,
        List<NameValuePair> params) {

    // Making HTTP request
    try {

        // check for request method
        if(method.equals("POST")){
            // request method is POST
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            String url1 = "http://192.168.0.29/evisiting_records/read_mytask.php?cid=1";
            HttpPost httpPost = new HttpPost(url1);
            httpPost.setEntity(new UrlEncodedFormEntity(params));

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

        }else if(method.equals("GET")){
            // request method is GET
            DefaultHttpClient httpClient = new DefaultHttpClient();
            String paramString = URLEncodedUtils.format(params, "utf-8");
            url += "?" + paramString;
            HttpGet httpGet = new HttpGet(url);

            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        }          

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
        Log.v("json from server ::",json);
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    // try parse the string to a JSON object
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    // return JSON String
    return jObj;

 }
}

请指导。如何解决?

【问题讨论】:

  • 为什么静态变量可以是局部变量?为什么您只通过记录它们然后继续处理所有异常,就好像一切都很好?您当前的问题异常发生在哪里?
  • b/c 我正在向我的 EditText 框发送请求,该框只能从中检索数据,并且不能使用非静态 JSONObject。 cus_name_txtbx.setText(my_task.getString(TAG_NAME));因为 my_task 是 JSONObject
  • 看起来你尝试做一些这里讨论的事情:stackoverflow.com/questions/2043580/…
  • @Android:我认为您误解了静态变量的工作原理......以及如何使用异常。
  • 哪行代码抛出异常?当您将静态变量设为本地时会发生什么?如果方法既不是 GET 也不是 POST 会发生什么?

标签: java php android mysql json


【解决方案1】:

错误告诉您 responseStream 已经调用了 .close() 。您之前是否在代码中使用过 responseStream 或将其与已调用 .close() 的任何其他流一起包装?

【讨论】:

  • 不,我以前没用过。我只是用它来发送httprequest以从服务器获取数据
  • @Android 相反,你肯定用过它并关闭它。例外没有错。
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