我已经创建了一个Servlet类，用于通过android客户端接收字符串。此类将此字符串发送到另一个servlet类。 使用REST API我正确地接收了字符串，但是当我创建JSONObject时，它会抛出java.lang.ClassNotFoundException：net.sf.json.JSONObject。 这里实现了代码：
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out= response.getWriter();
ArrayList<String> arrivo;
ArrayList<String> preference=new ArrayList<String>();
StringBuffer jb = new StringBuffer();
String line = null;
try {
BufferedReader reader = request.getReader();
while ((line = reader.readLine()) != null)
jb.append(line);
preference.add(line);
response(response,"ok");
System.out.println(response);
}
catch (Exception e) { //report an error
}
response(response,"no");
try {
String s=jb.toString();
arrivo=new ArrayList<String>(Arrays.asList(s.split(",")));
} catch (ParseException e) {
throw
new IOException("Error parsing JSON request string");
}
invio(arrivo);
}
public void invio(ArrayList<String> c){
String pref="";
String x=c.toString();
StringBuilder sb = new StringBuilder();
String http = "http://mioserver:80808";
HttpURLConnection urlConnection=null;
try {
URL url = new URL(http);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoOutput(true);
urlConnection.setRequestMethod("POST");
urlConnection.setUseCaches(false);
urlConnection.setConnectTimeout(10000);
urlConnection.setReadTimeout(10000);
urlConnection.setRequestProperty("Content-Type","application/json");
//urlConnection.setRequestProperty("Host","http://localhost:8080/W7TurismoServer/Servlet");
urlConnection.connect();
JSONObject object=new JSONObject();
object.put("",pref);
OutputStreamWriter out = new OutputStreamWriter(urlConnection.getOutputStream());
out.write(object.toString());
System.out.println(object.toString());
out.close();
int HttpResult =urlConnection.getResponseCode();
if(HttpResult ==HttpURLConnection.HTTP_OK){
BufferedReader br = new BufferedReader(new InputStreamReader(
urlConnection.getInputStream(),"utf-8"));
String line = null;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
br.close();
System.out.println(""+sb.toString());
}else{
System.out.println(urlConnection.getResponseMessage());
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
catch (Exception e) {
e.printStackTrace();
}
}
我该如何解决这个问题？先感谢您。