Java NegativeArraySizeException异常解决方案_Java教程

Java NegativeArraySizeException异常解决方案

2021-12-03 14:50蜗牛coder Java教程

这篇文章主要介绍了Java NegativeArraySizeException异常解决方案,本篇文章通过简要的案例,讲解了该项技术的了解与使用,以下就是详细内容,需要的朋友可以参考下

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();

									    }