Jersey 2.7 hello world

这两天有幸玩了把Jersey，Jersey是RESTful的封装，通过Jersey可以快速地开发出web service。目前，Jersey在Git上的最新版本是2.8，我实际用到了Jersey2.7. 废话少说，动手！

1.新建Maven工程

打开eclipse，new->project->Maven Project

next->输入'maven-archetype-webapp',选择搜索出来的选项，next

设定groupid，artifactid，package，Finish

2.修改pom.xml文件

主要是添加Jersey jar包，只需要添加jersey-container-servlet即可，另外，为保证使用jdk1.7编译执行，添加plugin，同时保留系统原有的junit包，具体配置如下

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.8</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet</artifactId>
        <version>2.7</version>
    </dependency>
  </dependencies>
  <build>
	<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-compiler-plugin</artifactId>
			<configuration>
				<source>1.7</source>
				<target>1.7</target>
			</configuration>
		</plugin>
	 </plugins>
	</build>
</project>

3.添加Jersey Servlet至web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    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"
    metadata-complete="false"
    version="3.0">
    
    <servlet>
        <servlet-name>org.glassfish.jersey.examples.helloworld_servlet.MyApplication</servlet-name>
    </servlet>
    <servlet-mapping>
        <servlet-name>org.glassfish.jersey.examples.helloworld_servlet.MyApplication</servlet-name>
        <url-pattern>/jaxrs/*</url-pattern>
    </servlet-mapping>
</web-app>

4.创建ResourceConfig继承类

创建MyApplication类，同时，注册一个resource类，用于实现真正的发送请求

package com.zliang.jerseyhelloworld;

import javax.ws.rs.ApplicationPath;

import org.glassfish.jersey.server.ResourceConfig;

@ApplicationPath("jaxrs")
public class MyApplication extends ResourceConfig {
	public MyApplication(){
		register(MyHelloWorldResource.class);
	}
}

5.创建Resource类用于实现Restful

package com.zliang.jerseyhelloworld;

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

@Path("hello")
public class MyHelloWorldResource {
	
	@GET
	@Produces(MediaType.TEXT_PLAIN)
	public String sayHello(){
		return "hello world!";
	}
}

6.创建index.jsp

实际上是在页面上加一个链接，能够让用户通过这个链接call restful

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello Jersey</title>
</head>
<body>
click me <a href="jaxrs/hello">hello jersey</a>
</body>
</html>

7.结果

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