很久以前，我已经开发了RESTFUL Web服务的教程。现在，我已经在eclipse中导入了相同的项目，但是我不记得如何使该项目更早地运行。 POM.XML和其他依赖项。
1.是否有必要使用Maven build来构建项目？这将给pom.xml
2.如果是，那么pom.xml是我们将定义依赖项的地方吗？就像需要读取一些excel文件的jar一样？在同一地方可以定义依赖项，并且它会自动下载。
3.我真的需要一个Maven版本吗？
我有简单的课程，还有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);
}
}
我的书类别
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();
}
}
4.什么时候我们真正需要POM.XML？到目前为止，它显示了poi jar的错误。我已经手动下载它们并将文件添加到项目中。仍然，如果我在APACHE TOMCAT 7服务器上运行该项目，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它，但是由于我有很多问题，我只是在中间迷路了。花了大约4个小时但没有前进。希望获得清晰明了的信息。
最佳答案
经过很少的研究和与MAVEN一起进行的几天脑力激荡，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.
构建的过程通常意味着它将以您编写的源文件开始，并以可以在服务器上部署的jar或war之类的文件结束。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.