Jersey实现Restful服务

Jersey 是基于Java的一个轻量级RESTful风格的Web Services框架。以下我基于IDEA实现Restful完整Demo。

1.创建maven-web工程，后面就是正常的maven工程创建流程。

2.添加Jersey框架的maven文件。

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.restful</groupId>
  <artifactId>jerseyDemo</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>jerseyDemo Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.containers</groupId>
      <artifactId>jersey-container-servlet</artifactId>
      <version>2.9</version>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.core</groupId>
      <artifactId>jersey-client</artifactId>
      <version>2.9</version>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.media</groupId>
      <artifactId>jersey-media-json-jackson</artifactId>
      <version>2.9</version>
    </dependency>
    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-client</artifactId>
      <version>1.19.3</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>jerseyDemo</finalName>
  </build>
</project>

3.Restful接口定义。

package com.restful.service;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.restful.entity.PersonEntity;

import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by XuHui on 2017/8/2.
 */
@Path("/JerseyService")
public class JerseyService {
    private static Map<String, PersonEntity> map = new HashMap<String, PersonEntity>();

    @GET
    @Path("/getAllResource")
    @Produces(MediaType.APPLICATION_JSON)
    public String getAllResource() throws JsonProcessingException {
        List<PersonEntity> list = new ArrayList<PersonEntity>();
        for (PersonEntity entity : map.values()) {
            list.add(entity);
        }

        ObjectMapper mapper = new ObjectMapper();
        return mapper.writeValueAsString(list);
    }

    @GET
    @Path("/getResourceById/{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public String getResource(@PathParam("id") String id) throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        return mapper.writeValueAsString(map.get(id));
    }

    @POST
    @Path("/addResource/{person}")
    @Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    @Produces(MediaType.APPLICATION_JSON)
    public String addResource(String person) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        PersonEntity entity = mapper.readValue(person, PersonEntity.class);
        map.put(entity.getId(), entity);
        return mapper.writeValueAsString(entity);
    }

    @GET
    @Path("/getRandomResource")
    @Produces(MediaType.APPLICATION_JSON)
    public String getRandomResource() throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        PersonEntity entity = new PersonEntity("NO1", "Joker", "http:///");
        return mapper.writeValueAsString(entity);
    }
}

PersonEntity实体类实现。

package com.restful.entity;

/**
 * Created by XuHui on 2017/8/2.
 */
public class PersonEntity {
    private String id;
    private String name;
    private String addr;

    public PersonEntity() {
    }

    public PersonEntity(String id, String name, String addr) {
        this.id = id;
        this.name = name;
        this.addr = addr;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }

    @Override
    public String toString() {
        return "PersonEntity{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", addr='" + addr + '\'' +
                '}';
    }
}

4.web.xml配置。

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>Jersey RESTful Application</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
      <param-name>jersey.config.server.provider.packages</param-name>
      <param-value>com.restful</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
  <servlet-name>Jersey RESTful Application</servlet-name>
  <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
</web-app> 

5.搭建本地tomcat

6.运行结果.http://localhost:8080/jerseyDemo/rest/application.wadl是所有对外接口的调用方法。使用postman来看看这个接口是怎么调用的吧。

POST请求

GET请求