Question

我有一个Dynamic Web项目Ajaxdemo，它包含一个JSP文件testingAjax.jsp。我想使用Ajax调用从testingAjax.jsp触发servlet AjaxDemoServ，并将servlet的响应设置回相同的JSP文件。 testsAjax.jsp的代码随附于此：

<!DOCTYPE html>
<html lang="en">
<head>
<title>SO question 4112686</title>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
$(document).on("click", "#somebutton", function() { // When HTML DOM "click" event is invoked on element with ID "somebutton", execute the following function...
$.get("/AjaxDemoServ", function(responseText) {   // Execute Ajax GET request on URL of "someservlet" and execute the following function with Ajax response text...
$("#somediv").text(responseText);           // Locate HTML DOM element with ID "somediv" and set its text content with the response text.
});
});
</script>
</head>
<body>
<button id="somebutton">press here</button>
<div id="somediv">Hi! I am Queen.</div>
</body>
</html>

servlet AjaxDemoServ如下：

package ajaxdemo;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//@WebServlet(value = "/AjaxDemoServ", loadOnStartup=0)
public class AjaxDemoServ extends HttpServlet {
    private static final long serialVersionUID = 1L;


    public AjaxDemoServ() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String text = "some text";

        System.out.println("Text is:" + text);

        response.setContentType("text/plain");  // Set content type of the response so that jQuery knows what it can expect.
        response.setCharacterEncoding("UTF-8"); // You want world domination, huh?
        response.getWriter().write(text);  
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }
}

P上。 S：我甚至尝试过使用@WebServlet注释，但没有发生任何变化！

我正在运行该应用程序的是Mozilla Firefox浏览器。如何在Mozilla Firefox中检查JavaScript控制台？如果知道，请告诉我如何在Google Chrome上查看相同内容。这是项目运行时出现在Eclipse IDE控制台中的日志内容：

Jun 01, 2016 1:12:49 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files (x86)\Java\jre7\bin;C:\windows\Sun\Java\bin;C:\windows\system32;C:\windows;C:/Program Files (x86)/Java/jre7/bin/client;C:/Program Files (x86)/Java/jre7/bin;C:/Program Files (x86)/Java/jre7/lib/i386;C:\oraclexe\app\oracle\product\10.2.0\server\bin;C:\app\USER\product\11.2.0\dbhome_1\bin;C:\oracle\ora90\bin;C:\oracle\ora90\Apache\Perl\5.00503\bin\mswin32-x86;C:\Program Files (x86)\Oracle\jre\1.1.8\bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\windows\system32;C:\windows;C:\windows\System32\Wbem;C:\windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files (x86)\Windows Live\Shared;D:\eclipse-jee-juno-SR1-win32(3)Final\eclipse;;.
Jun 01, 2016 1:12:49 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:JustNow' did not find a matching property.
Jun 01, 2016 1:12:49 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:AjaxDemo' did not find a matching property.
Jun 01, 2016 1:12:50 PM org.apache.coyote.AbstractProtocolHandler init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Jun 01, 2016 1:12:50 PM org.apache.coyote.AbstractProtocolHandler init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Jun 01, 2016 1:12:50 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 542 ms
Jun 01, 2016 1:12:50 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Jun 01, 2016 1:12:50 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.12
Jun 01, 2016 1:12:50 PM org.apache.catalina.util.SessionIdGenerator createSecureRandom
INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [265] milliseconds.
Jun 01, 2016 1:12:50 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\JustNow\WEB-INF\lib\servlet-api.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
Jun 01, 2016 1:12:51 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\AjaxDemo\WEB-INF\lib\servlet-api.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
Jun 01, 2016 1:12:51 PM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["http-bio-8080"]

    Jun 01, 2016 1:12:51 PM org.apache.coyote.AbstractProtocolHandler start

INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Jun 01, 2016 1:12:51 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1364 ms

对Servlet的Ajax调用不会在同一页面上显示Servlet响应

0 个答案: