使用Jersey开发RESTful的webservice服务
发布时间：2020-12-16 23:28:41 所属栏目：安全 来源：网络整理
导读：REST基础概念： 在REST中的一切都被认为是一种资源。 每个资源由URI标识。 使用统一的接口。处理资源使用POST，GET，PUT，DELETE操作类似创建，读取，更新和删除（CRUD）操作。 无状态。每个请求是一个独立的请求。从客户端到服务器的每个请求都必须包含所有
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REST基础概念：
RESTful Web服务由于其简单替代了基于SOAP的Web服务，并大型服务提供商所接受。这篇文章使用Jersey框架延伸JAX-RS API将展示如何创建一个REST风格的Web服务和客户端。 1，创建一个普通的web服务在Eclipse中，创建一个新的动态Web项目名为"RESTfulWS"：
导入jar包：
创建Web服务类： package com.eviac.blog.restws;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
/**
*
* @author pavithra
*
*/
// @Path here defines class level path. Identifies the URI path that
// a resource class will serve requests for.
@Path("UserInfoService")
public class UserInfo {
// @GET here defines,this method will method will process HTTP GET
// requests.
@GET
// @Path here defines method level path. Identifies the URI path that a
// resource class method will serve requests for.
@Path("/name/{i}")
// @Produces here defines the media type(s) that the methods
// of a resource class can produce. 也可使用json@Produces(MediaType.APPLICATION_JSON)
@Produces(MediaType.TEXT_XML)
// @PathParam injects the value of URI parameter that defined in @Path
// expression,into the method.
public String userName(@PathParam("i") String i) {
String name = i;
return "<User>" + "<Name>" + name + "</Name>" + "</User>";
}
@GET
@Path("/age/{j}")
@Produces(MediaType.TEXT_XML)
public String userAge(@PathParam("j") int j) {
int age = j;
return "<User>" + "<Age>" + age + "</Age>" + "</User>";
}
}
配置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/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>RESTfulWS</display-name>
<servlet>
<servlet-name>Jersey REST Service</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.eviac.blog.restws</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
点按这个项目?run as ->run on server. 浏览器浏览：http://localhost:8080/RESTfulWS/rest/UserInfoService/name/Pavithra URL说明：
创建一个调用客户端： package com.eviac.blog.restclient;
import javax.ws.rs.core.MediaType;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
/**
*
* @author pavithra
*
*/
public class UserInfoClient {
public static final String BASE_URI = "http://localhost:8080/RESTfulWS";
public static final String PATH_NAME = "/UserInfoService/name/";
public static final String PATH_AGE = "/UserInfoService/age/";
public static void main(String[] args) {
String name = "Pavithra";
int age = 25;
ClientConfig config = new DefaultClientConfig();
Client client = Client.create(config);
WebResource resource = client.resource(BASE_URI);
WebResource nameResource = resource.path("rest").path(PATH_NAME + name);
System.out.println("Client Response n"
+ getClientResponse(nameResource));
System.out.println("Response n" + getResponse(nameResource) + "nn");
WebResource ageResource = resource.path("rest").path(PATH_AGE + age);
System.out.println("Client Response n"
+ getClientResponse(ageResource));
System.out.println("Response n" + getResponse(ageResource));
}
/**
* Returns client response.
* e.g :
* GET http://localhost:8080/RESTfulWS/rest/UserInfoService/name/Pavithra
* returned a response status of 200 OK
*
* @param service
* @return
*/
private static String getClientResponse(WebResource resource) {
return resource.accept(MediaType.TEXT_XML).get(ClientResponse.class)
.toString();
}
/**
* Returns the response as XML
* e.g : <User><Name>Pavithra</Name></User>
*
* @param service
* @return
*/
private static String getResponse(WebResource resource) {
return resource.accept(MediaType.TEXT_XML).get(String.class);
}
}
运行这个客户端代码，得到结果： Client Response GET http://localhost:8080/RESTfulWS/rest/UserInfoService/name/Pavithra returned a response status of 200 OK Response <User><Name>Pavithra</Name></User> Client Response GET http://localhost:8080/RESTfulWS/rest/UserInfoService/age/25 returned a response status of 200 OK Response <User><Age>25</Age></User> 2.集成jersey到spring1，导入jar包：jersey-spring-1.7.jar等 2，在web.xml文件中修改原来的配置为如下：<!-- 发布资源的方式之一，Jersey与spring整合，WebService配置 --> ? <servlet> ? <span style="white-space:pre"> </span><servlet-name>JAX-RS REST Servlet</servlet-name> ? <span style="white-space:pre"> </span><servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class> ? <span style="white-space:pre"> </span><!-- 服务端 ?webservice类的包路径 --> <span style="white-space:pre"> </span><init-param> <span style="white-space:pre"> </span><param-name>com.sun.jersey.config.property.packages</param-name> <span style="white-space:pre"> </span><param-value>cn.hydom.ztc.ws.impl</param-value> <span style="white-space:pre"> </span></init-param> <span style="white-space:pre"> </span><load-on-startup>1</load-on-startup> </servlet> ? <servlet-mapping> ? <span style="white-space:pre"> </span><servlet-name>JAX-RS REST Servlet</servlet-name> ? <span style="white-space:pre"> </span><url-pattern>/services/*</url-pattern> ? </servlet-mapping> 3，在web服务的实体类上加注解(@Component)，一个简单的示例： @Component
@Path("/user")
public class UserResource {
?
? ? @Path("/users/{username}")
? ? @GET
? ? @Produces(MediaType.TEXT_PLAIN) //@Produces(MediaType.TEXT_XML) | @Produces(MediaType.APPLICATION_JSON)
? ? public String getUser(@PathParam("username") String username) {
? ? ? ? log.debug("username:{}",username);
? ? ? ? return username;
? ? }
? ? @Path("/users/save")
? ? @POST
? ? @Consumes(MediaType.APPLICATION_FORM_URLENCODED) //请求数据类型
? ? public void saveUser(@FormParam("id") String id,? ? ? ? ? ? ? ? ? ? ? ? ?@FormParam("username") String username,@Context HttpServletRequest request,? ? ? ? ? ? ? ? ? ? ? ? ?@Context HttpServletResponse response) {
? ? ? ? log.debug("id:{},username:{}",id,username);
? ? ? ? log.debug("request:{},response:{}",request,response);
? ? }
}
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