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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