切换到 java 1.7 和 eclipse 时，服务器未正确将 Ajax 映射到 Servlet答案

【问题标题】：Server not mapping Ajax to Servlet correctly when switched to java 1.7 and eclipse切换到 java 1.7 和 eclipse 时，服务器未正确将 Ajax 映射到 Servlet
【发布时间】：2015-06-27 05:13:48
【问题描述】：

TLDR：如果我使用 Tomcat 而不是 Glassfish 或 jkd 1.7 而不是 jdk 1.8，我是否必须使用不同的语法来访问我的 servlet？我无法让我的 jquery ajax 与我的 servlet 通信（在 eclipse 1.7 jdk tomcat 而不是 netbeans 1.8 jdk glassfish 中）

我正在尝试将我的项目从 Netbeans 1.8 JDK 转换为 Eclipse 1.7 JKD。

它在 Netbeans 中运行良好。我已经花了 5 个多小时试图让它现在在 Eclipse 上运行。

我认为问题在于它没有将我的 ajax "search" 映射到 servlet "/search" 。

servlet 被注释

@WebServlet(name = "SearchServlet", urlPatterns = {"/search"})

我必须假设这适用于 JDK 1.7.....？

我在添加与我的 netbeans 相同的 glassfish 服务器时遇到了麻烦。我设法添加了它，但后来它消失了，我没有任何可用的服务器，直到我放弃并安装了一个 tomcat。但是我不知道您是否应该进一步配置它。

我尝试通过将 glassfish 服务器工具拖到我的 IDE 中来添加它，但它显示Nothing to update：Nothing to update。所以我只是坚持使用tomcat。

这是我运行 jsp 时的日志：

Apr 20, 2015 1:48:48 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:animelist1' did not find a matching property.
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server version:        Apache Tomcat/8.0.21
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built:          Mar 23 2015 14:11:21 UTC
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number:         8.0.21.0
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Name:               Windows 7
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Version:            6.1
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture:          amd64
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Java Home:             C:\Program Files\Java\jdk1.7.0_79\jre
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Version:           1.7.0_79-b15
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Vendor:            Oracle Corporation
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_BASE:         C:\Users\J\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_HOME:         C:\Program Files\apache-tomcat-8.0.21
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.base=C:\Users\J\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=C:\Program Files\apache-tomcat-8.0.21
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=C:\Users\J\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Djava.endorsed.dirs=C:\Program Files\apache-tomcat-8.0.21\endorsed
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=Cp1252
Apr 20, 2015 1:48:48 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
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\Java\jdk1.7.0_79\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Skype\Phone\;C:\Program Files\Google\Cloud SDK\google-cloud-sdk\bin;C:\Program Files\Java\jdk1.7.0_79\jdk1.7.0_79\bin;.
Apr 20, 2015 1:48:48 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-8080"]
Apr 20, 2015 1:48:48 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Apr 20, 2015 1:48:48 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-nio-8009"]
Apr 20, 2015 1:48:48 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Apr 20, 2015 1:48:48 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 772 ms
Apr 20, 2015 1:48:48 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Apr 20, 2015 1:48:48 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/8.0.21
Apr 20, 2015 1:48:49 PM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Apr 20, 2015 1:48:49 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8080"]
Apr 20, 2015 1:48:49 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-nio-8009"]
Apr 20, 2015 1:48:49 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1162 ms

这是我尝试通过单击 jsp 上的按钮进行搜索时的日志：

Apr 20, 2015 1:50:11 PM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet SearchServlet as unavailable
Apr 20, 2015 1:50:11 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet SearchServlet
javax.naming.NameNotFoundException: Name [main.SearchServlet/annj] is not bound in this Context. Unable to find [main.SearchServlet].
    at org.apache.naming.NamingContext.lookup(NamingContext.java:818)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:166)
    at org.apache.catalina.core.DefaultInstanceManager.lookupFieldResource(DefaultInstanceManager.java:573)
    at org.apache.catalina.core.DefaultInstanceManager.processAnnotations(DefaultInstanceManager.java:461)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:144)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:121)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1095)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:817)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1474)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

第一次之后的进一步搜索给出了这个：

POST http://localhost:8080/animelist1/search 404 (Not Found)jQuery.ajaxTransport.send @ jquery-1.10.2.js:8706jQuery.extend.ajax @ jquery-1.10.2.js:8136(anonymous function) @ basic.js:8jQuery.event.dispatch @ jquery-1.10.2.js:5095jQuery.event.add.elemData.handle @ jquery-1.10.2.js:4766

我必须更改我的环境变量才能降级到 JDK 1.7。我把它们放在下面，以防它们不正确并导致问题（一直在搞乱它们，但我认为它们现在是）：

（未添加/更改用户变量）

系统变量：

路径

%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Skype\Phone\;C:\Program Files\Google\Cloud SDK\google-cloud-sdk\bin;C:\Program Files\Java\jdk1.7.0_79\jdk1.7.0_79\bin

JAVA_HOME

C:\Program Files\Java\jdk1.7.0_79

我即将放弃并恢复到 Netbeans 1.8 JDK 并将我的 Web 项目上传到 Google App Engine 以外的其他地方（仅适用于 1.7）。如果有人能够帮助我，我会再给它一个小时，但是当有其他选择时，我已经浪费了太长时间了。

就像我说的，我怀疑问题与我的服务器配置或与之相关的某些文件有关。下面我将粘贴我的 ajax 和我的 servlet。他们都在 netbeans 1.8 jdk 中工作，但也许他们需要为 eclipse 1.7 jdk 进行更改？

感谢您的阅读！

jQuery

$(document).ready(function () {
    $('#searchForm').submit(function () {

        $.ajax({
            url: 'search',
            type: 'POST',
            dataType: 'text',
            data: $('#searchForm').serialize(),
            success: function (data) {

                $('#displaySearchResults').html(data);
//                    $('#displaySearchResults').slideDown(500);
//                
                $("#sortable1").empty();

                $.each(JSON.parse(data), function (listID, mapData) {

                    $("#sortable1").append(
                            "<li class=userList><div class=selectedItemId id=" + mapData.id + "><img class=selectedItemImg src=" 
                            + mapData.url + " alt=" + mapData.name 
                            + " style='width:216px;height:300px'></img><div id='animeTitle'>"
                            + mapData.name+ "</div></div></li>");


//                    <ul id="sortable1" class="connectedSortable">
//            <li class="ui-state-default">Item 1</li>

//                    var d1 = mapData.id;
//                    var d2 = d1.replace("'","");
//                    var div = document.createElement(d2);
//                    document.body.appendChild(div);


//                    $("#"+divName).text(mapData.id);
//                    $("#displaySearchResults2").text(mapData.name);
//                    $("#displaySearchResults3").text(mapData.url);

                });
            }
        });
        return false;
    });
});

小服务程序

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package main;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.gson.Gson;
import entities.Anime;
import entities.Ann;
import entities.Info;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author J
 */
@WebServlet(name = "SearchServlet", urlPatterns = {"/search"})
public class SearchServlet extends HttpServlet {

        /**
     * 
     */
    private static final long serialVersionUID = 1L;

        @EJB
    private AnnJAXB annj;

//    @EJB
//    private AnnJAXB annJAXB = new AnnJAXB();

    @EJB
    private Ann ann;

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet SearchServlet</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet SearchServlet at " + request.getContextPath() + "</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

//        processRequest(request, response);

//        Map <String, Object> map = new HashMap<String, Object>();

        String searchQuery = request.getParameter("searchQuery");
//         response.getWriter().write(searchQuery);

//        map.put("searchQuery", searchQuery);
//        returnResults(response, map);

        returnResults(response, searchQuery);

    }

    private void returnResults(HttpServletResponse response, String searchQuery) throws IOException {

        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");

        ArrayList<Map> arrayOfMap = new ArrayList<Map>();

        try {
            for (Anime anime : annj.Unmarshalling(searchQuery).getAnn()) {

                Map<String, String> map = new HashMap<String, String>();

                map.put("name", anime.getName());
                map.put("id", anime.getId());

                for (Info temp : anime.getAnime()) {
                    if (temp.getSrc() != null) {

                        map.put("url", temp.getSrc());
                    }
                }
                arrayOfMap.add(map);


            }

              response.getWriter().write(new Gson().toJson(arrayOfMap));

        } catch (Exception e) {}
    }


    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

【问题讨论】：

跟Java版本无关。 @WebServlet 是 JEE 注释，而不是标准的 JDK 注释。由于它是一个标准，它在 Tomcat 和 Glassfish 中的工作方式相同。您可能遇到的唯一问题是辅助 Eclipse 中的应用程序部署尚未正常工作。如：servlet 类文件根本没有部署到服务器上。
感谢您的回答。我已经工作了很长时间，我认为我们已经很接近了。我明白你刚才说的话。我有一种“感觉”，这可能与我需要重新指定 main/base/root 位置有关...我这么说是因为在 netbeans 版本中，我通过转到 localhost:8080 或 localhost:8080/index.jsp 来访问 jsp ，而在 Eclipse 版本中，我需要转到 localhost:8080/animelist1.index.jsp 或 localhost:8080/animelist1 。对于日食，转到 localhost:8080 404s 。为什么会这样？谢谢！！！
我将 / 添加到了我的 server.xml 文件中，页面在 localhost:8080 加载，但是它现在在 localhost:8080/animelist1 打开。这意味着需要配置不同的东西来告诉它从哪里“开始寻找”东西......

标签： java ajax eclipse servlets netbeans

【解决方案1】：

据我所知，符号

@WebServlet(name = "SearchServlet", urlPatterns = {"/search"})

仅适用于 jdk 1.8 但如果你仍然使用 jdk 1.7，忘记符号并用这个映射填充 web.xml

<servlet>
    <servlet-name>search</servlet-name>
    <servlet-class>yourPackage.search</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>search</servlet-name>
    <url-pattern>/search</url-pattern>
</servlet-mapping>

【讨论】：