依赖项和库(JAR) 下载,概念

【问题标题】：Dependencies and Library(JAR) Download,Concept依赖项和库(JAR) 下载,概念
【发布时间】：2014-06-30 22:03:00
【问题描述】：

我很久以前开发了一个 RESTFUL Web 服务的教程。现在我在我的 Eclipse 中导入了同一个项目，但我不记得我是如何让这个项目更早运行的。我想知道更多关于POM.XML 和其他依赖的意义。

1.是否需要使用Maven build来构建项目？这将给 pom.xml

2.如果是，pom.xml 是我们定义依赖的地方吗？像需要读取一些 excel 文件的 jars？这是我可以定义依赖项的同一个地方，它会自动下载。

3.我真的需要一个 Maven 构建吗？ 为此，我有简单的课程、DAO 和 BEAN。

import java.io.IOException;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;

import Bean.bookBean;
import Dao.bookDao;
@Path ("login")
public class bookPost {

@GET
@Path("validate")
@Produces(MediaType.TEXT_PLAIN)
    public String login(@QueryParam("frition")String un,@QueryParam("thriller")String pwd) throws IOException
{
    bookDao dao=new bookDao();
    bookBean tt=new bookBean();
    tt.setFrition(un);
    tt.setThriller(pwd);

    return dao.loginValidate(tt);
    }
}

My bookCategory 类

import javax.ws.rs.core.UriBuilder;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import Bean.bookBean;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import jxl.Cell;
import jxl.CellType;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;

    public class BookCategories {

        private String inputFile;
        public void setInputFile(String inputFile) {
            this.inputFile = inputFile;
        }

        public void read() throws IOException  {
            File inputWorkbook = new File(inputFile);
            Workbook w;
            try {
                w = Workbook.getWorkbook(inputWorkbook);
                // Get the first sheet
                Sheet sheet = w.getSheet(0);
                // Loop over first 10 column and lines

                for (int j = 0; j < sheet.getColumns(); j++) {
                    for (int i = 0; i < sheet.getRows(); i++) {
                        Cell cell = sheet.getCell(j, i);
                        CellType type = cell.getType();

                        if (cell.getType() == CellType.LABEL) {
                            System.out.println("books "
                                    + cell.getContents());
                        }
            }
                }
            } catch (BiffException e) {
                e.printStackTrace();
            }



        }

        public static void main(String[] args) throws IOException {
            ClientConfig config = new DefaultClientConfig();
            Client client = Client.create(config);
            WebResource service = client.resource(getBaseURI());
            // Fluent interfaces
            bookBean lbean = new bookBean();
            lbean.setFrition("frition");
            lbean.setThriller("thriller");
            String cr =service.path("login").path("postvalidate").post(String.class,lbean);
            System.out.println(cr);
}

private static URI getBaseURI() {
    return UriBuilder.fromUri("http://localhost:8080/Services").build();
}

        }

4.我们什么时候真正需要 POM.XML？到目前为止，它显示 poi jar 的错误。我已经手动下载了它们并将添加到项目中的文件也放入了。如果我在 APACHE TOMCAT 7 服务器上运行项目，控制台中会出现以下错误。

Error May 13, 2014 2:44:05 PM com.sun.jersey.api.core.servlet.WebAppResourceConfig init
INFO: Scanning for root resource and provider classes in the Web app resource paths:
  /WEB-INF/lib
  /WEB-INF/classes
May 13, 2014 2:44:06 PM com.sun.jersey.api.core.ScanningResourceConfig init
INFO: No root resource classes found.
May 13, 2014 2:44:06 PM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Provider classes found:
  class org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider
  class org.codehaus.jackson.jaxrs.JacksonJsonProvider
  class org.codehaus.jackson.jaxrs.JsonMappingExceptionMapper
  class org.codehaus.jackson.jaxrs.JsonParseExceptionMapper
May 13, 2014 2:44:06 PM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.12 02/15/2012 04:51 PM'
May 13, 2014 2:44:06 PM com.sun.jersey.server.impl.application.RootResourceUriRules <init>
SEVERE: The ResourceConfig instance does not contain any root resource classes.
May 13, 2014 2:44:06 PM org.apache.catalina.core.ApplicationContext log
SEVERE: StandardWrapper.Throwable
com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
    at com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:99)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1308)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:171)
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:777)
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:773)
    at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:773)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:768)
    at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
    at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
    at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:607)
    at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:208)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
    at javax.servlet.GenericServlet.init(GenericServlet.java:160)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1133)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1087)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:799)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:383)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

May 13, 2014 2:44:06 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet Ebook
com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
    at com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:99)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1308)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:171)
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:777)
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:773)
    at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:773)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:768)
    at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
    at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
    at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:607)
    at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:208)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
    at javax.servlet.GenericServlet.init(GenericServlet.java:160)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1133)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1087)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:799)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:383)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

我试图在其他论坛上找到这个。但我只是在中间迷路了，因为我有很多问题。花了大约 4 个小时但没有继续前进。希望得到清晰明了的信息。

【问题讨论】：

    标签： java eclipse maven deployment concept


    【解决方案1】：

    经过少量研究和几天与 MAVEN 的头脑风暴。我能够自己回答我的问题。

    1. No it is not a compulsion to build a project using maven build or ant build or any other build.But if you are using MAVEN it will definitely have pom.xml where you will be defining dependencies,details of packaging the JAR's.

    构建过程通常意味着它将从您编写的源文件开始，并以可以部署在服务器上的 jar 或 war 之类的东西结束。

    2. Yes you can define the compile time and run time dependencies.If you want to know about [compile time and run time dependencies](http://stackoverflow.com/questions/4270950/compile-time-vs-run-time-dependency-java).And yes it also provide you the feature to download the required jars when you will be building the jar in a different machine then yours using that pom.xml.

    3. If you want to package it in jar and define dependency you need MAVEN.Else you do not need maven build for this.

    【讨论】：

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