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Jersey是JAX-RS(JSR311)开源参考实现用于构建RESTful Web service。此外Jersey还提供一些额外的API和扩展机制,所以开发人员能够按照自己的需要对Jersey进行扩展
理论的东西在这里我就不多说了！这个实例是实现了REST的三个基本get、put、delete功能，数据存储在mongo里。下面的截图是整个工程的目录结构
工程入口是App.java 里的main,
运行结果如下图：运行app类中入口后，程序监听8080端口，大家会发现，我们不需要tomcat等web容器即可轻松创建web服务，简洁快速。
下面这张图是运行完TestClient测试客户端的输出结果，增删改查输出结果
下面这张图是 运行添加数据后，mongo中添加成功的数据。
下面我来依依列出代码
一、maven的pom.xml代码如下：
<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.example</groupId> <artifactId>jerseyUserDemo</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>jerseyUserDemo Maven Webapp</name> <url>http://maven.apache.org</url> <repositories> <repository> <id>snapshot-repository.java.net</id> <name>Java.net Snapshot Repository for Maven</name> <url>https://maven.java.net/content/repositories/snapshots/</url> <layout>default</layout> </repository> <repository> <id>spring.test-mvc</id> <url>http://repo.springsource.org/libs-milestone</url> </repository> <repository> <id>repo1</id> <name>repo1</name> <url>http://repo1.maven.org/maven2</url> </repository> <repository> <id>jboss-cache</id> <name>jboss-cache</name> <url>http://repository.jboss.org/maven2</url> </repository> <repository> <id>mvnsearch</id> <name>mvnsearch Maven Repository</name> <url>http://www.mvnsearch.org/maven2</url> </repository> <repository> <id>ibiblio</id> <name>ibiblio Maven Repository</name> <url>http://www.ibiblio.org/maven2</url> </repository> <repository> <id>mirrors.ibiblio</id> <name>mirrors.ibiblio Maven Repository</name> <url>http://mirrors.ibiblio.org/pub/mirrors/maven2</url> </repository> </repositories> <dependencies> <!-- Tomcat Servlet API --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> </dependency> <dependency> <groupId>org.glassfish.jersey.containers</groupId> <artifactId>jersey-container-grizzly2-servlet</artifactId> <version>2.13</version> </dependency> <dependency> <groupId>org.glassfish.jersey.containers</groupId> <artifactId>jersey-container-servlet-core</artifactId> <version>2.13</version> </dependency> <dependency> <groupId>org.glassfish.jersey.media</groupId> <artifactId>jersey-media-json-jackson</artifactId> <version>2.13</version> </dependency> <!-- Required only when you are using JAX-RS Client --> <dependency> <groupId>org.glassfish.jersey.core</groupId> <artifactId>jersey-client</artifactId> <version>2.13</version> </dependency> <!-- mongodb --> <dependency> <groupId>org.mongodb</groupId> <artifactId>mongo-java-driver</artifactId> <version>2.12.4</version> </dependency> </dependencies> <build> <finalName>jerseyUserDemo</finalName> </build> </project>
二、User实体类代码如下
package model;
import java.io.Serializable;
public class User implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private String id;
private String userName;
private String phone;
public User(){}
public User(String id, String userName, String phone) {
super();
this.id = id;
this.userName = userName;
this.phone = phone;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "User [id=" + id + ", userName=" + userName + ", phone=" + phone + "]";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
User other = (User) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}
}
三、UserResource类代码如下，这里制定了访问的路径。
package resource;
import java.util.List;
import javax.inject.Singleton;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import model.User;
import service.UserService;
@Singleton
@Path("/users")
public class UserResource {
@GET
@Produces({ "application/json", "application/xml" })
public List<User> getMyResources() {
List<User> users = UserService.getUsers();
return users;
}
@GET
@Path("/list")
@Produces({ "application/json", "application/xml" })
public List<User> getListOfUsers() {
List<User> users = UserService.getUsers();
return users;
}
@GET
@Path("/{id}")
@Produces({ "application/json" })
public User getUser(@PathParam("id") String id) {
User u=UserService.getUserById(id);
return u;
}
@PUT
//@Path("/ids/{id}")
@Consumes({ "application/json", "application/xml" })
public void putUser(User user) {
UserService.updateUser(user);
}
@POST
//@Path("/ids/{id}")
@Consumes({ "application/json", "application/xml" })
public void postUser(User user) {
UserService.addUser(user);
}
@DELETE
@Path("/{id}")
public void deleteUser(@PathParam("id") String id) {
UserService.delUserById(id);
}
}四、MyApplication类，通过将UserResourcer加载到应用中
package main;
import java.util.HashSet;
import java.util.Set;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
import resource.UserResource;
/**
* @author Pavel Bucek (pavel.bucek at oracle.com)
*/
@ApplicationPath("/")
public class MyApplication extends Application {
@Override
public Set<Class<?>> getClasses() {
final Set<Class<?>> classes = new HashSet<Class<?>>();
// register root resource
classes.add(UserResource.class);
return classes;
}
}
五、App类是整个工程的入口，通过运行该类中的main函数启动即可
启动后可以通过运行TestClient类中的客户端测试代码进行测试。我继续贴代码。
代码如下：
package main;
import java.io.IOException;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.grizzly.http.server.HttpServer;
import org.glassfish.jersey.grizzly2.servlet.GrizzlyWebContainerFactory;
import org.glassfish.jersey.server.ServerProperties;
import org.glassfish.jersey.servlet.ServletContainer;
import resource.UserResource;
/**
* @author Pavel Bucek (pavel.bucek at oracle.com)
*/
public class App {
private static final URI BASE_URI = URI.create("http://localhost:8080/webapp/");
public static final String ROOT_PATH = "users";
public static void main(String[] args) {
try {
Map<String, String> initParams = new HashMap<String, String>();
initParams.put(ServerProperties.PROVIDER_PACKAGES, UserResource.class.getPackage().getName());
final HttpServer server = GrizzlyWebContainerFactory.create(BASE_URI, ServletContainer.class, initParams);
System.out.println(String.format("Application started.%nTry out %s%s%nHit enter to stop it...",
BASE_URI, ROOT_PATH));
System.in.read();
server.shutdownNow();
} catch (IOException ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
六、TestClient测试客户端代码：
package client;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import model.User;
import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;
/**
*
* @author zhongtianyi
*
*/
public class TestClient {
private static String serverUri = "http://localhost:8080/webapp";
/**
* @param args
*/
public static void main(String[] args) {
User user = new User("006", "tianyi", "12355123891");
addUser(user);
getAllUsers();
user = new User("006", "tianyi", "33");
String id = user.getId();
updateUser(user);
getUserById(id);
getAllUsers();
delUser(id);
getAllUsers();
}
/**
* 添加用户
*/
private static void addUser(User user) {
System.out.println("****增加用户addUser****");
Client client = ClientBuilder.newClient();
WebTarget target = client.target(serverUri + "/users");
Response response = target.request()
.buildPost(Entity.entity(user, MediaType.APPLICATION_JSON))
.invoke();
response.close();
}
/**
* 删除用户
*/
private static void delUser(String id) {
System.out.println("****删除用户****");
Client client = ClientBuilder.newClient();
WebTarget target = client.target(serverUri + "/users/" + id);
Response response = target.request().delete();
response.close();
}
/**
* 修改用户
*/
private static void updateUser(User user) {
System.out.println("****修改用户updateUser****");
Client client = ClientBuilder.newClient();
WebTarget target = client.target(serverUri + "/users");
Response response = target.request()
.buildPut(Entity.entity(user, MediaType.APPLICATION_JSON))
.invoke();
response.close();
}
/**
* 根据id查询用户
*/
private static void getUserById(String id) {
System.out.println("****根据id查询用户****");
Client client = ClientBuilder.newClient().register(
JacksonJsonProvider.class);// 注册json 支持
WebTarget target = client.target(serverUri + "/users/" + id);
Response response = target.request().get();
User user = response.readEntity(User.class);
System.out.println(user.getId() + user.getUserName());
response.close();
}
/**
* 查询所有用户
*/
private static void getAllUsers() {
System.out.println("****查询所有getAllUsers****");
Client client = ClientBuilder.newClient();
WebTarget target = client.target(serverUri + "/users");
Response response = target.request().get();
String value = response.readEntity(String.class);
System.out.println(value);
response.close(); // 关闭连接
}
}
七、其他代码
package utils;
import java.util.ArrayList;
import java.util.List;
import model.User;
import com.mongodb.BasicDBList;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.MongoOptions;
import com.mongodb.ServerAddress;
public class MongoDBUtils {
public static Mongo mongo = null;
public static DB db = null;
private static String dbName = "UserAdmin";
private static String mongodbServerAddress = "127.0.0.1:2005";
private static String colName = "User";
public static DBCollection getDBCollection() {
try {
if (mongo == null) {
List<ServerAddress> addList = new ArrayList<ServerAddress>();
String[] addrs = mongodbServerAddress.split(";");
for (String address : addrs) {
ServerAddress addr = new ServerAddress(address);
addList.add(addr);
}
mongo = new Mongo(addList);
// mongodb连接池数
MongoOptions opt = mongo.getMongoOptions();
opt.connectionsPerHost = 400;
opt.threadsAllowedToBlockForConnectionMultiplier = 20;
opt.maxWaitTime = 5000;
opt.socketTimeout = 0;
opt.connectTimeout = 15000;
}
if (db == null) {
db = mongo.getDB(dbName);
}
} catch (Exception e) {
}
return db.getCollection(colName);
}
public static User findUserByID(String id) {
DBCollection coll = null;
coll = getDBCollection();
DBCursor cur = coll.find(new BasicDBObject("id", id));
User user = new User();
if (cur.size() > 0) {
while (cur.hasNext()) {
DBObject o = (DBObject) cur.next();
String userName = o.get("username").toString();
String phone = o.get("phone").toString();
user.setId(id);
user.setPhone(phone);
user.setUserName(userName);
}
}
return user;
}
public static List<User> findUsers() {
DBCollection coll = null;
DBObject queryType = null;
coll = getDBCollection();
List<User> users=new ArrayList<User>();
DBCursor cur = coll.find();
if (cur.size() > 0) {
while (cur.hasNext()) {
User user = new User();
DBObject o = (DBObject) cur.next();
String id = o.get("id").toString();
String userName = o.get("username").toString();
String phone = o.get("phone").toString();
user.setId(id);
user.setPhone(phone);
user.setUserName(userName);
users.add(user);
}
}
return users;
}
public static void removeByID(String value) {
DBCollection coll = null;
try {
coll = getDBCollection();
coll.remove(new BasicDBObject().append("id", value));
} catch (Exception e) {
}
}
public static void insertUserData(User user) {
DBCollection dbCol = null;
try {
dbCol = getDBCollection();
List<DBObject> dbList = new ArrayList<DBObject>();
BasicDBObject subscribe = new BasicDBObject();
subscribe.put("id", user.getId());
subscribe.put("username", user.getUserName());
subscribe.put("phone", user.getPhone());
dbList.add(subscribe);
dbCol.insert(dbList);
} catch (Exception e) {
}
}
public static void updateByUser(User user) {
DBCollection coll = null;
try {
coll = getDBCollection();
BasicDBObject newDocument3 = new BasicDBObject().append("$set",
new BasicDBObject().append("username", user.getUserName())
.append("phone", user.getPhone()));
coll.update(new BasicDBObject().append("id", user.getId()), newDocument3);
} catch (Exception e) {
}
}
public static void close() {
try {
if (mongo != null) {
mongo.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
package service;
import java.util.List;
import dao.UserDao;
import model.User;
public class UserService {
public static User getUserById(String id) {
return UserDao.getUserById(id);
}
public static List<User> getUsers() {
return UserDao.getUsers();
}
public static void delUserById(String id) {
UserDao.delUserById(id);
}
public static void addUser(User user) {
UserDao.addUser(user);
}
public static void updateUser(User user) {
UserDao.updateUser(user);
}
}
package dao;
import java.util.ArrayList;
import java.util.List;
import utils.MongoDBUtils;
import model.User;
public class UserDao {
private UserDao() {
}
private static List<User> users = new ArrayList<User>();
public static void addUser(User u) {
//users.add(u);
MongoDBUtils.insertUserData(u);
}
public static User getUserById(String id) {
return MongoDBUtils.findUserByID(id);
/*for (User u : users) {
if (u.getId().equals(id)) {
return u;
}
}
return null;*/
}
public static List<User> getUsers() {
return MongoDBUtils.findUsers();
}
public static void delUserById(String id) {
MongoDBUtils.removeByID(id);
/*User user = null;
for (User u : users) {
if (u.getId().equals(id)) {
user = u;
}
}
if (user != null) {
users.remove(user);
}*/
}
public static void updateUser(User user) {
/*
for (User u : users) {
if (u.getId().equals(user.getId())) {
u.setUserName(user.getUserName());
u.setPhone(user.getPhone());
}
}*/
MongoDBUtils.updateByUser(user);
}
}
运行结果如下图：运行app类中入口后，程序监听8080端口，大家会发现，我们不需要tomcat等web容器即可轻松创建web服务，简洁快速。
下面这张图是运行完TestClient测试客户端的输出结果，增删改查输出结果
下面这张图是 运行添加数据后，mongo中添加成功的数据。