Java NegativeArraySizeException异常解决方案

问题描述:服务器接收后台返回的报文时,提示java.lang.NegativeArraySizeException

分析:这种异常返回的原因,一般情况下没有报文提示为返回空报文,初步分析是响应报文流长度出了问题

百度一下类似的情况:https://stackoverflow.com/questions/11207897/negative-array-size-exception

节选部分内容:


try{
     connection = (HttpConnection)Connector.open("http://someurl.xml",Connector.READ_WRITE);
     URLEncodedPostData postData = new URLEncodedPostData(URLEncodedPostData.DEFAULT_CHARSET, false);
     postData.append("username", "loginapi");
     postData.append("passWord", "myapilogin");
     postData.append("term", word);
 
     connection.setRequestMethod(HttpConnection.POST);
     connection.setRequestProperty("Content-Type","application/x-www-fORM-urlencoded");
     connection.setRequestProperty("User-Agent","Profile/MIDP-2.0 Configuration/CLDC-1.0");
     requestOut = connection.openOutputStream();
     requestOut.write(postData.getBytes());
     String contentType = connection.getHeaderField("Content-type");
     detailIn = connection.openInputStream();        
     int length = (int) connection.getLength();
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
     if(length > 0){//这里长度没有判定的情况下,byte array长度若为-1会产生错误
         byte info[] = new byte[length];
         int bytesRead = detailIn.read(info);
         while(bytesRead > 0) {
             baos.write(info, 0, bytesRead);
             bytesRead = detailIn.read(info);
             }
         baos.close();
         connection.close();
         requestSuceeded(baos.toByteArray(), contentType);
 
         detailIn.read(info);
     }
     else
     {
          System.out.println("Negative array size");
     }
           requestOut.close();
           detailIn.close();
           connection.close();
    }

  结论:HTTP服务器在返回响应报文的时候,没有进行content.length长度判断,按照常规流程响应了错误长度的报文,导致了接收方报文长度异常

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