即時通訊使用Eclipse IDE和當我運行我的程序一切工作正常,但是當我在服務器上運行相同的程序,然後它給了我這個例外,我已經把我所有的遠程文件以及在我的lib文件夾,請幫我簡單解釋一下這個問題。例外在Apache HTTP客戶端
java.lang.ClassNotFoundException: org.apache.http.HttpRequest at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1701) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1546) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:791) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2836) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1160) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1668) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1546) at org.controller.KeyRank.doPost(KeyRank.java:41) at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722)
這裏是我的代碼:
public String readGoogle(String keyword, int page) { HttpClient client = new DefaultHttpClient(); // Create a method instance keyword = keyword.trim(); keyword = keyword.replaceAll(" ", "+"); String url = "http://www.google.com/search?q="+keyword+"&start="+page+"&btnG=Google+Search&aq=f&oq="; String responseBody = ""; HttpGet method = new HttpGet(url); //Provide custom retry handler is necessary //:OC:method.getParams().setParameter(HttpConnectionParams.RETRY_HANDLER, new DefaultHttpRequestRetryHandler(3, false)); try{ //execute the method System.out.println("executing request " + method.getURI()); // Create a response handler ResponseHandler responseHandler = new BasicResponseHandler(); responseBody = client.execute(method, responseHandler); System.out.println("----------------------------------------"); System.out.println(responseBody); System.out.println("----------------------------------------"); } catch (HTTPException e) { System.err.println("Fatal protocol violation: " + e.getMessage()); e.printStackTrace(); } catch (IOException e) { System.err.println("Fatal transport error: " + e.getMessage()); e.printStackTrace(); } finally { //release the connection method.releaseConnection(); } return responseBody; }
ClassNotFoundException只能表示指定的類不在您的類路徑中。再次檢查所有正確的罐子是否在你的類路徑上。 – 2013-02-26 19:00:37
是的,我已經添加了所有的罐子以及我已經添加jar到我的WEB-INF/lib文件夾(httpclient-4.2.3.jar),但它給我例外相同的代碼工作時,我運行它使用主。但不工作時,我在本地主機上運行它 – ashishchaudharyjavaoracle 2013-02-26 19:03:15
@ashishchaudharyjavaoracle你需要httpcore jar文件。在下面檢查我的答案。 – 2013-02-26 19:09:31