Jersey HelloWorld!

开发环境
Maven版本： 3.5.0
JerSey版本：2.26
Java 版本：1.8.0_131

pom.xml
[xml]
<!– https://mvnrepository.com/artifact/org.glassfish.jersey.containers/jersey-container-servlet –>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<version>2.26</version>
</dependency>
<!– https://mvnrepository.com/artifact/org.glassfish.jersey.inject/jersey-hk2 –>
<dependency>
<groupId>org.glassfish.jersey.inject</groupId>
<artifactId>jersey-hk2</artifactId>
<version>2.26</version>
</dependency>
<!– https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api –>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
[/xml]

web.xml
[xml]
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.0">
<display-name>DemoJersey</display-name>
<servlet>
<servlet-name>com.test.rest.App</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>com.test.rest.App</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>
</web-app>
[/xml]

代码
App.java
[java]
package com.test.rest;

import javax.ws.rs.core.Application;
import java.util.HashSet;
import java.util.Set;

public class App extends Application {

@Override
public Set<Class<?>> getClasses() {
HashSet<Class<?>> classes = new HashSet<Class<?>>();
classes.add(DogResource.class);
classes.add(CatResource.class);
classes.add(HelloWorldResource.class);

return classes;
}
}
[/java]
HelloWorldResource.java
[java]
package com.test.rest;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

@Path("hello")
public class HelloWorldResource {

@GET
@Produces("text/plain")
public String getHello() {
return "Hello World!";
}

}
[/java]

测试
访问：http://localhost:8080/DemoJersey/api/hello

问题
1.Exception

HTTP Status 500 - Servlet.init() for servlet Jersey REST Service threw exception

type Exception report

message Servlet.init() for servlet Jersey REST Service threw exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet Jersey REST Service threw exception 

解决办法
增加依赖
[xml]
<dependency>
<groupId>org.glassfish.jersey.inject</groupId>
<artifactId>jersey-hk2</artifactId>
</dependency>
[/xml]
参考：https://stackoverflow.com/questions/44088493/jersey-stopped-working-with-injectionmanagerfactory-not-found