负数组大小异常 [英] Negative Array Size Exception
本文介绍了负数组大小异常的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是新来的黑莓，我试图让后一个搜索词在XML中的服务器。不过，我不断收到此错误请求失败。原因Java.lang.NegativeArraySizeException 。
我要检查是否连接正常我解析数据之前，所以从这个方面，我希望接收的XML响应文本。下面是code：
公共无效的WebPost（字符串字）{
字= EN code（字）;
字符串的responseText;
尝试{
的HttpConnection连接=（HttpConnection的）Connector.open（HTTP：//一些url.xml）;
connection.setRequestMethod（HttpConnection.POST）;
connection.setRequestProperty（内容类型，应用程序/ x-WWW的形式urlen codeD）;
字符串POSTDATA =用户名= loginapi＆放大器;密码= myapilogin＆放术语=+字;
connection.setRequestProperty（内容长度，Integer.toString（postData.length（）））;
connection.setRequestProperty（用户代理，资料/ MIDP-2.0配置/ CLDC-1.0）;
OutputStream的请求输出= connection.openOutputStream（）;
requestOut.write（postData.getBytes（））; InputStream的detailIn = connection.openInputStream（）;
字节信息[] =新的字节[（INT）connection.getLength（）];
detailIn.read（信息）;
detailIn.close（）;
requestOut.close（）;
connection.close（）时;
responseText的=新的String（信息）;
requestSuceeded（requestOut.toString（），responseText的）;
}
赶上（例外前）{
requestFailed（ex.toString（））;
}
}
私人无效requestSuceeded（字符串结果，字符串的responseText）{
如果（responseText.startsWith（文/ XML））{
字符串strResult =新的String（结果）;
同步（UiApplication.getEventLock（））{
textOutputField.setText（strResult）;
}
}
其他{
同步（UiApplication.getEventLock（））{
Dialog.alert（未知的内容类型：+ responseText的）;
}
}
}
公共无效requestFailed（最后弦乐消息）{
UiApplication.getUiApplication（）的invokeLater（Runnable的新（）{
公共无效的run（）{
Dialog.alert（请求失败原因：+消息）;
}
}）;
}
私人字符串连接code（字符串textIn）{
// EN为HTTP POST code文本
textIn = textIn.replace（''，'+'）;
字符串的TextOut =;
的for（int i = 0; I＆LT; textIn.length（）;我++）{
焦炭wcai = textIn.charAt（I）
如果（Character.isDigit（wcai）及！＆放大器;！Character.isLowerCase（wcai）及＆放大器;！Character.isUpperCase（wcai）及＆放大器;！wcai ='+'）{
开关（wcai）{
案件 '。'：
案件 '-'：
案件 '*'：
案件 '_'：
的TextOut = +的TextOut wcai;
打破;
默认：
=的TextOut textout+\"%\"+Integer.toHexString(wcai).toUpperCase();//=textout.concat(\"%\").concat(Integer.toHexString(wcai));
}
}其他{
的TextOut = +的TextOut wcai; // = textout.concat（wcai +）;
}
}
返回的TextOut;
}
解决方案
找到了！我忘了开的输出流连接
=请求输出connection.openOutputStream（）;
和我介绍了 ByteArrayOutpuStream 这让我终于显示输入流。我也改变了我送参数的方式，并用 URLEn codedPostData 键入代替。由于服务器是间preting我以前的请求作为GET而不是POST。而我现在要做的是解析信息进来。
{尝试
连接=（HttpConnection的）Connector.open（HTTP：//someurl.xml，Connector.READ_WRITE）;
URLEn codedPostData POSTDATA =新URLEn codedPostData（URLEn codedPostData.DEFAULT_CHARSET，FALSE）;
postData.append（用户名，loginapi）;
postData.append（密码，myapilogin）;
postData.append（术语，字）; connection.setRequestMethod（HttpConnection.POST）;
connection.setRequestProperty（内容类型，应用程序/ x-WWW的形式urlen codeD）;
connection.setRequestProperty（用户代理，资料/ MIDP-2.0配置/ CLDC-1.0）;
请求输出= connection.openOutputStream（）;
requestOut.write（postData.getBytes（））;
串的contentType = connection.getHeaderField（内容类型）;
detailIn = connection.openInputStream（）;
INT长度=（int）的connection.getLength（）;
ByteArrayOutputStream BAOS =新ByteArrayOutputStream（）;
如果（长度大于0）{
字节信息[] =新的字节[长度]
INT读取动作= detailIn.read（信息）;
而（读取动作大于0）{
baos.write（资讯，0，读取动作）;
读取动作= detailIn.read（信息）;
}
baos.close（）;
connection.close（）时;
requestSuceeded（baos.toByteArray（），则contentType）; detailIn.read（信息）;
}
其他
{
的System.out.println（负数组大小）;
}
requestOut.close（）;
detailIn.close（）;
connection.close（）时;
}
PS。我张贴上述code，以帮助任何人同样的问题。
PPS。我还用卡莱的格式它帮助奇妙。
I'm new to Blackberry and I'm trying to get post a search term to a server in xml. But I keep getting this error Request Failed. Reason Java.lang.NegativeArraySizeException.
I wanted to check if the connection works before I parse the data so from this connection, am expecting to receive the response text in xml. Below is the code:
public void webPost(String word) {
word = encode (word);
String responseText;
try{
HttpConnection connection = (HttpConnection)Connector.open("http://some url.xml");
connection.setRequestMethod(HttpConnection.POST);
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
String postData = "username=loginapi&password=myapilogin&term="+ word;
connection.setRequestProperty("Content-Length",Integer.toString(postData.length()));
connection.setRequestProperty("User-Agent","Profile/MIDP-2.0 Configuration/CLDC-1.0");
OutputStream requestOut = connection.openOutputStream();
requestOut.write(postData.getBytes());
InputStream detailIn = connection.openInputStream();
byte info[]=new byte[(int)connection.getLength()];
detailIn.read(info);
detailIn.close();
requestOut.close();
connection.close();
responseText=new String(info);
requestSuceeded(requestOut.toString(), responseText);
}
catch(Exception ex){
requestFailed(ex.toString());
}
}
private void requestSuceeded(String result, String responseText) {
if(responseText.startsWith("text/xml")) {
String strResult = new String(result);
synchronized(UiApplication.getEventLock()) {
textOutputField.setText(strResult);
}
}
else{
synchronized(UiApplication.getEventLock()) {
Dialog.alert("Unknown content type: " + responseText);
}
}
}
public void requestFailed(final String message) {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.alert("Request failed. Reason: " + message);
}
});
}
private String encode(String textIn) {
//encode text for http post
textIn = textIn.replace(' ','+');
String textout = "";
for(int i=0;i< textIn.length();i++){
char wcai = textIn.charAt(i);
if(!Character.isDigit(wcai) && !Character.isLowerCase(wcai) && !Character.isUpperCase(wcai) && wcai!='+'){
switch(wcai){
case '.':
case '-':
case '*':
case '_':
textout = textout+wcai;
break;
default:
textout = textout+"%"+Integer.toHexString(wcai).toUpperCase();//=textout.concat("%").concat(Integer.toHexString(wcai));
}
}else{
textout = textout+wcai;//=textout.concat(wcai+"");
}
}
return textout;
}
解决方案
Found it! I forgot to open the Output Stream connection
requestOut = connection.openOutputStream();
and I introduced ByteArrayOutpuStream which helped me finally display the input stream. I also, changed the way I was sending parameters, and used URLEncodedPostData type instead. Since the server was interpreting my former request as a GET instead of a POST. And all I have to do now is to parse the info coming in.
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){
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();
}
PS. I posted the above code to help anyone with the same problem.
PPS. I also used Kalai's format and it helped wonderfully.
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