Eclipse+Tomcat+Jersey 编写 REST web service

1. Eclipse新建一个dynamic web project

2. 下载Jersey库文件，https://jersey.java.net/,将其中所有jar复制到webcontent/web-inf/lib目录下 (当前最新版本是jaxrs-ri-2.9.zip)

3. 保证当前使用的是JRE7/JDK1.7 以兼容Jersey类库

4. 编写 HelloWorld Web Service

package cn.com.chaser.restapi;

import org.glassfish.jersey.filter.LoggingFilter;
import org.glassfish.jersey.server.ResourceConfig;

public class RestApplication extends ResourceConfig {

public RestApplication() {

packages("cn.com.chaser.restapi");

register(LoggingFilter.class);
}
}

创建一 rest Api

package cn.com.chaser.restapi;

import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

@Path("/restService")
public class RestService {
@GET
@Path("/getInfo")
@Produces(MediaType.TEXT_PLAIN)
public String getWebServiceInfo() {
return "Hello,RESTful web service!";
}

@GET
@Path("/{parameter}")
public Response respondMessage(@PathParam("parameter") String parameter,
@DefaultValue("Nothing to say") @QueryParam("value") String value) {
String out = "Hello from " + parameter + ":" + value;
return Response.status(200).entity(out).build();
}
}

@GET：表示该接口接受GET方法

@Path: 定义访问路径

@Produces(MediaType.TEXT_PLAIN)

返回文本信息

5. 编写webcontent/web-inf/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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">

<display-name>RestService</display-name>
<servlet>
<servlet-name>mobile</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer
</servlet-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>cn.com.chaser.restapi.RestApplication</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mobile</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

6. 右键点击项目，export to war文件，到 tomcat7/webapps/目录下

7. 启动tomcat7进行测试

a) http://localhost:8080/RestService/rest/restService/getInfo
显示：

Hello,RESTful web service!

b) http://localhost:8080/RestService/rest/restService/getInfow
显示:

Hello from getInfow:Nothing to say

c) http://localhost:8080/RestService/rest/restService/wwwsw?value=24
返回:

Hello from wwwsw:24

参考：

1. http://www.vogella.com/tutorials/REST/article.html
2. https://jersey.java.net/nonav/documentation/latest/user-guide.html