java 如何在没有 web.xml 的情况下实现 jaxrs 应用程序
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How to implement jaxrs Application without web.xml
提问by edwardmlyte
I am trying to deploy a really simple jaxrs application with without a web.xml config and cannot get it working. My URL I'd expect to access is serverandport/{appname}/rest/welcomes/hello and I think I must be missing something dead obvious.
我试图在没有 web.xml 配置的情况下部署一个非常简单的 jaxrs 应用程序，但无法使其工作。我希望访问的 URL 是 serverandport/{appname}/rest/welcomes/hello，我想我一定遗漏了一些显而易见的东西。
Application
应用
@ApplicationPath("/rest")
public class EngineApp extends Application {
@Override
public Set<Class<?>> getClasses() {
Set<Class<?>> s = new HashSet<Class<?>>();
s.add(RestTestImpl.class);
return s;
}
}
Resource
资源
@Path("/welcomes")
public class RestTestImpl {
@GET
@Path("hello")
public String sayPlainHello() {
return "Hi from Rest";
}
}
POM snippet
POM 片段
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
Edit: Further to the response below, I tried with an empty web.xml and also with the following web.xml. Bother also return 404, however the xml below states "Servlet javax.ws.rs.core.Application is not available":
编辑：对于下面的响应，我尝试使用空的 web.xml 以及以下 web.xml。麻烦也返回 404，但是下面的 xml 声明“Servlet javax.ws.rs.core.Application 不可用”：
web.xml
网页.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" >
<servlet>
<servlet-name>javax.ws.rs.core.Application</servlet-name>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>javax.ws.rs.core.Application</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
采纳答案by Michal Gajdos
You need to deploy your application into a Servlet 3.0 compliant container to take advantage of this functionality. Try GlassFish 3.xor Tomcat 7.
您需要将应用程序部署到 Servlet 3.0 兼容容器中才能利用此功能。尝试GlassFish 3.x或Tomcat 7。
回答by jabal
I have found a quite similar question and the problem found there could help you as well. I would definitely try it with an empty web.xml with 3.0 schema version to see if it helps.
我发现了一个非常相似的问题，那里发现的问题也可以帮助你。我肯定会尝试使用带有 3.0 架构版本的空 web.xml 来查看它是否有帮助。
回答by edwardmlyte
For those wishing to use the Servlet 2.0 specification, create a web.xml and add in the jersey servlet maven dependency:
对于那些希望使用 Servlet 2.0 规范的人，创建一个 web.xml 并添加 jersey servlet maven 依赖项：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>REST Service</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>com.mycompany.rest.engine.EngineApp</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>REST Service</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
Add dependency to pom
给pom添加依赖
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-servlet</artifactId>
<version>1.13</version>
</dependency>
