嘗試使用JSON將http發佈到服務器，得到：java.io.UnsupportedEncodingException

我有一個服務器上有一個servlet，它充當我的移動應用程序的後端。當我在Eclipse中測試它時，它在我的計算機上工作正常，但是當我嘗試從服務器獲取數據時，它會在日誌中出現。嘗試使用JSON將http發佈到服務器，得到：java.io.UnsupportedEncodingException

Mar 15, 2012 4:38:37 AM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [Hello] in context with path [] threw exception 
java.io.UnsupportedEncodingException: The character encoding [ISO-8859-1, application/json] is not supported 
at org.apache.tomcat.util.buf.B2CConverter.getCharset(B2CConverter.java:74) 
at org.apache.tomcat.util.buf.B2CConverter.reset(B2CConverter.java:159) 
at org.apache.tomcat.util.buf.B2CConverter.<init>(B2CConverter.java:97) 
at org.apache.catalina.connector.InputBuffer.setConverter(InputBuffer.java:556) 
at org.apache.catalina.connector.InputBuffer.checkConverter(InputBuffer.java:518) 
at org.apache.catalina.connector.Request.getReader(Request.java:1238) 
at org.apache.catalina.connector.RequestFacade.getReader(RequestFacade.java:505) 
at com.myserver.server.Hello.decodeRequest(Hello.java:319) 
at com.myserver.server.Hello.doPost(Hello.java:93) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579) 
at org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:1763) 
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
at java.lang.Thread.run(Thread.java:662)

這是怎麼回事？是託管公司還是我？

編輯：這裏是我使用的罐子列表。

ASM-3.1.jar

傑克遜核-ASL-1.8.3.jar

傑克遜 - JAXRS-1.8.3.jar

傑克遜映射器-ASL-1.8.3的.jar

傑克遜-XC-1.8.3.jar

球衣，客戶1.10.jar

球衣-COR E-1.10.jar

球衣，JSON-1.10.jar

球衣 - 服務器1.10.jar

球衣，servlet的1.10.jar

拋放-1.1.jar

JSR311-API-1.1.1.jar

源碼-JDBC-3.7.2.jar

鱈魚Ë是職位JSON：

public class SendJSON{ 
JSONArray outr = new JSONArray(); 

GetSet gs = new GetSet(); 
URI u; 
String out; 

public JSONArray sendJ(final JSONArray json) throws JSONException{ 

    ATask task = new ATask(json); 
    AsyncTask<URL, Integer, JSONArray> t = task.execute(); 
    try { 
     outr = t.get(); 
    } catch (InterruptedException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } catch (ExecutionException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    return outr; 
} 

public JSONArray sendJ2(final JSONArray json) throws JSONException { 

    try { 
     u = new URI("http://mycensoredurl/Hello"); 
    } catch (URISyntaxException e1) { 
     e1.printStackTrace(); 
    } 

    HttpClient client = new DefaultHttpClient(); 

    HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit HttpResponse response; 
    HttpPost post = new HttpPost(u); 

    StringEntity se = null; 
    try { 

     se = new StringEntity(json.toString()); 
    } catch (UnsupportedEncodingException e1) { 
     // TODO Auto-generated catch block 
     e1.printStackTrace(); 
    } 

    se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json")); 

    post.setEntity(se); 

    StringBuilder builder = new StringBuilder(); 
    try { 
     HttpResponse response = client.execute(post); 
     StatusLine statusLine = response.getStatusLine(); 
     int statusCode = statusLine.getStatusCode(); 
     if (statusCode == 200) { 
      Log.d("DEBUG", "status code = 200"); 
      HttpEntity entity = response.getEntity(); 
      InputStream content = entity.getContent(); 
      BufferedReader reader = new BufferedReader(
        new InputStreamReader(content)); 
      String line; 
      while ((line = reader.readLine()) != null) { 
       builder.append(line); 
      } 
     } else { 
      Log.e(SendJSON.class.toString(), "Failed to download file"); 
     } 
    } catch (ClientProtocolException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    Log.d("JSON RESPONSE SHOULD", "BE NEXT.."); 

    Log.d("JSON RESPONSE LENGTH", ""+ builder.length()); 
    out = builder.toString(); 
    gs.setOut(out); 

    Log.d("SendJSON... JSON RESPONSE String", ""+ out); 
    return new JSONArray(out); 
} 

private class ATask extends AsyncTask<URL, Integer, JSONArray>{ 
    private JSONArray jary; 

    private ATask(JSONArray json) { 
     this.jary = json; 
    } 

    @Override 
    protected JSONArray doInBackground(URL... params) { 
     try { 
      outr = sendJ2(jary); 
     } catch (JSONException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     return outr; 
    } 

}

}

在那裏的異步任務，我認爲，是學士學位並不需要在那裏。一位教授讓我把它放在那裏作爲任務的一部分。（這不是順便說一下家庭作業幫助，那下課）

來源

2012-03-15 tricknology

我們可以看到您的代碼形成JSON併發布它嗎？它似乎不喜歡ISO8859-1 - 你可以試試UTF-8嗎？ – JTeagle 2012-03-15 08:11:19

我不知道如何告訴它發送UTF-8，因爲所有有碰巧是se.setContentEncoding（新的BasicHeader（HTTP.CONTENT_TYPE，「application/json」））; – tricknology 2012-03-15 08:17:53

看起來你的Content-Type頭是回來打破 - 它應該是這樣的：

Content-Type: application/json; charset=ISO-8859-1

，但它看起來像它可能回來作爲：

Content-Type: application/json; charset=ISO-8859-1, application/json

或類似的東西。看看報頭的東西，如Wireshark

這看起來像問題：

se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));

我懷疑application/json不應該是編碼的一部分 - 它的內容類型的一部分。嘗試將其更改爲：

se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));

來源

2012-03-15 08:17:23

太棒了！有用。謝謝！ ..現在，當我試圖找到數據庫時，我得到了NPE，但那是因爲我正在「學習」如何使用相對路徑訪問它（因爲我不能只是c：/ users /.../ mydb.db在共享機器上）而不是絕對路徑。我對這一切都很陌生。 – tricknology 2012-03-15 08:29:00

對智者說話，獲得絕對路徑。相對路徑只會導致問題 – tricknology 2013-10-20 09:14:39

@tricknology：這聽起來對我來說是一個壞主意。正確使用相對路徑*應該沒問題，而且會更便於攜帶。 – 2013-10-20 13:08:37

嘗試手動將其設置爲UTF-8由JTeagle作爲所述使用

request.setCharacterEncoding（「UTF-8」）;

來源

2012-03-15 08:17:39

嘗試使用JSON將http發佈到服務器，得到：java.io.UnsupportedEncodingException

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