1.建一个maven web项目

新建一个maven项目，next，第一个框不要勾选

选择maven-archetype-webapp，建一个web项目

键入项目组织id与项目id

一般此时搭建的只是最基本的骨架，还缺了很多东西，我们可以自己按需求去增加。

右键项目，build path，编辑jre，选择默认

web项目的基本构造就出来了

再新建目录，在main和test下面新建resources，然后再build path里的source添加关联

最后再增加服务器jboss的包，整个web项目框架就基本没有报错的搭建起来了

2.最基本的讲完了，现在开始做一个resteasy的简单实例。

2.1首先，配置pom.xml，为项目添加下载resteasy的jar，下面给出jar的配置版本(可去网上查看最新版本)

org.jboss.resteasy

resteasy-jaxrs

2.2.1.GA

org.projectlombok

lombok

1.16.10

lombok是一个用来简化代码的工具，后面给出的代码有用到，也可以不用，但要自己写set，get及类的初始化

ps1：此时可能出现的错误，提示缺少依赖包，如下图，解决办法：右键maven---update project 一下，使新的包在本地生效，一般就能解决问题。

ps2：如果update项目后报JavaServer Faces 2.0 requires Dynamic Web Module 2.5 or newer之类的错误，就是你的web版本太旧，此时项目右键properties—project facets—Dynamic Web Module，修改为3.0的版本，一般就能解决。

ps3：如果在面版不能修改，此时，你就需要去底层修改web的版本了，首先更改maven生成的web.xml的web-app标签内容，再去项目底层demo\.settings路径下，修改org.eclipse.wst.common.project.facet.core.xml文件的配置，将其都改为3.0的版本。下面分别为旧的web.xml，新的web.xml，以及.core.xml的配置

/p>

"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

Archetype Created Web Application

http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"version="3.0">

2.2配置web.xml，注册resources的模式有三种：

2.2.1手动注册resources的模式

/p>

"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

Archetype Created Web Application

resteasy.resources

com.fengyuan.restapi.UserService

resteasy.servlet.mapping.prefix

/service

org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap

resteasy-servlet

org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher

resteasy-servlet

/service/*

2.2.2手动指定Application的模式

/p>

"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

Archetype Created Web Application

resteasy.servlet.mapping.prefix

/service

resteasy-servlet

org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher

javax.ws.rs.Application

com.mk.rest.RestApplication

resteasy-servlet

/service/*

2.2.3自动Scan的模式，我使用这种模式，启动项目时，会报类似下面的错误

17:56:16,506 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/demo]] (MSC service thread 1-6) Exception sending context initialized event to listener instance of class org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap: java.lang.RuntimeException: Unable to find a public constructor forclass org.jboss.resteasy.core.AsynchronousDispatcher

at org.jboss.resteasy.plugins.server.resourcefactory.POJOResourceFactory.registered(POJOResourceFactory.java:35) [resteasy-jaxrs-2.3.2.Final.jar:]

at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:121) [resteasy-jaxrs-2.3.2.Final.jar:]

at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:107) [resteasy-jaxrs-2.3.2.Final.jar:]

at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:84) [resteasy-jaxrs-2.3.2.Final.jar:]

at org.jboss.resteasy.core.ResourceMethodRegistry.addPerRequestResource(ResourceMethodRegistry.java:73) [resteasy-jaxrs-2.3.2.Final.jar:]

at org.jboss.resteasy.spi.ResteasyDeployment.registration(ResteasyDeployment.java:367) [resteasy-jaxrs-2.3.2.Final.jar:]

at org.jboss.resteasy.spi.ResteasyDeployment.start(ResteasyDeployment.java:225) [resteasy-jaxrs-2.3.2.Final.jar:]

at org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap.contextInitialized(ResteasyBootstrap.java:28) [resteasy-jaxrs-2.3.2.Final.jar:]

at org.apache.catalina.core.StandardContext.contextListenerStart(StandardContext.java:3392) [jbossweb-7.0.13.Final.jar:]

at org.apache.catalina.core.StandardContext.start(StandardContext.java:3850) [jbossweb-7.0.13.Final.jar:]

at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:90) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final]

at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811)

at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_80]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_80]

at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_80]17:56:16,567 ERROR [org.apache.catalina.core.StandardContext] (MSC service thread 1-6) Error listenerStart17:56:16,568 ERROR [org.apache.catalina.core.StandardContext] (MSC service thread 1-6) Context [/demo] startup failed due to previous errors17:56:16,603 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-6) MSC00001: Failed to start service jboss.web.deployment.default-host./demo: org.jboss.msc.service.StartException in service jboss.web.deployment.default-host./demo: JBAS018040: Failed to start context

at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:95)

at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]

at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_80]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_80]

at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_80]17:56:16,817 INFO [org.jboss.as.server] (DeploymentScanner-threads - 2) JBAS015870: Deploy of deployment "demo.war" was rolled back with failure message {"JBAS014671: Failed services" => {"jboss.web.deployment.default-host./demo" => "org.jboss.msc.service.StartException in service jboss.web.deployment.default-host./demo: JBAS018040: Failed to start context"}}17:56:16,872 INFO [org.jboss.as.server.deployment] (MSC service thread 1-8) JBAS015877: Stopped deployment demo.war in 59ms17:56:16,873 INFO [org.jboss.as.controller] (DeploymentScanner-threads - 2) JBAS014774: Service status report

JBAS014777: Services which failed to start: service jboss.web.deployment.default-host./demo: org.jboss.msc.service.StartException in service jboss.web.deployment.default-host./demo: JBAS018040: Failed to start context17:56:16,875 ERROR [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 1) {"JBAS014653: Composite operation failed and was rolled back. Steps that failed:" => {"Operation step-2" => {"JBAS014671: Failed services" => {"jboss.web.deployment.default-host./demo" => "org.jboss.msc.service.StartException in service jboss.web.deployment.default-host./demo: JBAS018040: Failed to start context"}}}}

原因不明，下面我的自动扫描配置，希望有大神能指点下

/p>

"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

Archetype Created Web Application

resteasy.scan

true

resteasy.servlet.mapping.prefix

/service

org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap

resteasy-servlet

org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher

resteasy-servlet

/service/*

2.3下面给出简单的java类

新建一个简单的User类，使用了lombok插件注解(可以简化代码，自动生成set，get等方法)，lombok的安装方法自行百度，安装后还要在pxm.xml里配置，见上文

packagecom.fengyuan.domain;importlombok.AllArgsConstructor;importlombok.Data;

@Data

@AllArgsConstructorpublic classUser {privateString name;private intage;privateString tel;

}

要发布的资源类UserService

packagecom.fengyuan.restapi;importjava.util.ArrayList;importjava.util.HashMap;importjava.util.List;importjava.util.Map;importjava.util.Map.Entry;importjavax.ws.rs.GET;importjavax.ws.rs.Path;importjavax.ws.rs.PathParam;importjavax.ws.rs.Produces;importcom.fengyuan.domain.User;

@Path("userservice") //服务路径

public classUserService {/*** 初始化三个用户数据，存入map中，key为用户id，value为用户对象*/

static Map userMap = new HashMap<>();static{

User user1= new User("Lee", 24, "138***");

userMap.put(1, user1);

User user2= new User("Cathy", 25, "188***");

userMap.put(2, user2);

User user3= new User("Aaron", 26, "186***");

userMap.put(3, user3);

}/*** 获取指定id的用户

*

*@paramid

*@return

*/@GET

@Path("user/{id}") //具体服务的路径, id是入参

@Produces("application/json") //返回的格式

public User getById(@PathParam("id") Integer id) {return(User) userMap.get(id);

}/*** 以json格式返回所有用户

*

*@return

*/@GET

@Path("users")

@Produces("application/json")public ListgetUsers() {

List userList = new ArrayList();for (Entryuser : userMap.entrySet()) {

userList.add(user.getValue());

}returnuserList;

}

}

测试结果

下面给出Application的模式的代码

packagecom.mk.rest;importjava.util.HashSet;importjava.util.Set;importcom.fengyuan.restapi.UserService;public class RestApplication extendsjavax.ws.rs.core.Application{private Set singletons = new HashSet();/*在这里增加资源类*/

publicRestApplication () {

singletons.add(newMessageRestService());

singletons.add(newUserService());

}

@Overridepublic SetgetSingletons() {returnsingletons;

}

}

后续会边学习边给出resteasy的其他复杂实例，欢迎随时指正～～～～