Java Servlet:Tomcat Server找到MongoDB类和软件包

Question

我正在尝试将mongoDB数据库连接到tomcat。我下载了三个3.10.1 Java驱动程序JAR文件，mongodb-driver-3.10.1-javadoc.jar，mongodb-driver-3.10.1-sources.jar和mongodb-driver-3.10.1.jar。我将它们添加到WEB-INFlib中。我还在META-INFcontext.xml中添加了MongoDB资源，并在WEB-INFweb.xml中添加了资源参考。尽管如此，Tomcat还是说不存在包装com.mongodb。有人对此有修复吗？

我的context.xml文件：

<Context reloadable="true">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <Resource name="mongodb/MyMongoClient"
          auth="Container"
          type="com.mongodb.MongoClient"
          closeMethod="close"
          factory="com.mongodb.client.jndi.MongoClientFactory"
          singleton="true"
          connectionString="mongodb://localhost:80"/>
</Context>

我的web.xml文件：

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app version="3.0"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <servlet>
        <servlet-name>Test</servlet-name>
        <servlet-class>Test</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Test</servlet-name>
        <url-pattern>/test</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>TestCheck</servlet-name>
        <servlet-class>TestCheck</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>TestCheck</servlet-name>
        <url-pattern>/testCheck</url-pattern>
    </servlet-mapping>
    <resource-ref>
        <res-ref-name>
            mongodb/MyMongoClient
        </res-ref-name>
        <res-type>
            com.mongodb.MongoClient
        </res-type>
        <res-auth>
            Container
        </res-auth>
    </resource-ref>
</web-app>

我的test.java文件：

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

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.BasicDBObject;
@WebServer("/test")
public class Test extends HttpServlet{
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

        //Connect
        MongoClient mongoClient = new MongoClient(new MongoClientURI("mongodb://localhost:80"));

        DB database = mongoClient.getDB("testDB");
        DBCollection collection = database.getCollection("testCollection");
        DBObject testDoc = new BasicDBObject("_id", "This is a test");
        collection.insert(testDoc);
        //close
        mongoClient.close();
    }
}

最后，尝试编译后，命令提示的输出：

Test.java:11: error: package com.mongodb does not exist
import com.mongodb.MongoClient;
                  ^
Test.java:12: error: package com.mongodb does not exist
import com.mongodb.MongoClientURI;
                  ^
Test.java:14: error: package com.mongodb does not exist
import com.mongodb.DB;
                  ^
Test.java:15: error: package com.mongodb does not exist
import com.mongodb.DBCollection;
                  ^
Test.java:16: error: package com.mongodb does not exist
import com.mongodb.DBObject;
                  ^
Test.java:17: error: package com.mongodb does not exist
import com.mongodb.BasicDBObject;
                  ^
Test.java:19: error: cannot find symbol
@WebServer("/test")
 ^
  symbol: class WebServer
Test.java:27: error: cannot find symbol
                MongoClient mongoClient = new MongoClient(new MongoClientURI("mo
ngodb://localhost:80"));
                ^
  symbol:   class MongoClient
  location: class Test
Test.java:27: error: cannot find symbol
                MongoClient mongoClient = new MongoClient(new MongoClientURI("mo
ngodb://localhost:80"));
                                              ^
  symbol:   class MongoClient
  location: class Test
Test.java:27: error: cannot find symbol
                MongoClient mongoClient = new MongoClient(new MongoClientURI("mo
ngodb://localhost:80"));
                                                              ^
  symbol:   class MongoClientURI
  location: class Test
Test.java:30: error: cannot find symbol
                DB database = mongoClient.getDB("testDB");
                ^
  symbol:   class DB
  location: class Test
Test.java:31: error: cannot find symbol
                DBCollection collection = database.getCollection("testCollection
");
                ^
  symbol:   class DBCollection
  location: class Test
Test.java:33: error: cannot find symbol
                DBObject testDoc = new BasicDBObject("_id", "Hello!");
                ^
  symbol:   class DBObject
  location: class Test
Test.java:33: error: cannot find symbol
                DBObject testDoc = new BasicDBObject("_id", "Hello!");
                                       ^
  symbol:   class BasicDBObject
  location: class Test
14 errors

任何帮助都将不胜感激。

Answer 1

它不是tomcat，它是编译器。要将mongoDB库添加到tomcat中，才能能够运行(Web(应用程序，但是为了 compile ，您必须将它们添加到编译器的类Path。如果直接使用javac，请参见-cp交换机(或在此处查看(，如果使用某些构建系统(例如Maven(，请查看其文档如何添加编译依赖项。