negativearraysizeexception(如何解決Java中NegativeArraySizeException異常的問題)

問題描述:服務器接收后臺返回的報文時,提示java.lang.negativearraysizeexception

分析:這種異常返回的原因,一般情況下沒有報文提示為返回空報文,初步分析是響應報文流長度出了問題

百度一下類似的情況:https://stackoverflow.com/questions/11207897/negative-array-size-exception

節選部分內容:

try{connection=(HttpConnection)Connector.open("http://someurl.xml",Connector.READ_WRITE);URLEncodedPostDatapostData=newURLEncodedPostData(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-2.0Configuration/CLDC-1.0");requestOut=connection.openOutputStream();requestOut.write(postData.getBytes());StringcontentType=connection.getHeaderField("Content-type");detailIn=connection.openInputStream();intlength=(int)connection.getLength();ByteArrayOutputStreambaos=newByteArrayOutputStream();if(length>0){//這里長度沒有判定的情況下,bytearray長度若為-1會產生錯誤byteinfo[]=newbyte[length];intbytesRead=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("Negativearraysize");}requestOut.close();detailIn.close();connection.close();}

　　結論:HTTP服務器在返回響應報文的時候,沒有進行content.length長度判斷,按照常規流程響應了錯誤長度的報文,導致了接收方報文長度異常