MongoDB(三)——java集成mongodb

代码下载地址：https://github.com/tazhigang/big-data-github.git

一、项目结构

二、pom.xml

1. mongodb-parent----->pom.xml

   	
   	
   		4.0.0
   
   		com.ittzg.mongodb
   		mongodb-parent
   		pom
   		1.0-SNAPSHOT
   
   		
   			mongodb-client
   			springboot-mongodb
   		
   		
   			
   			
   				com.alibaba
   				fastjson
   				1.2.58
   			
   		
   		
   			
   				
   					org.apache.maven.plugins
   					maven-compiler-plugin
   					
   						1.8
   						1.8
   						UTF-8
   					
   				
   			
   		
   	
   

2. mongodb-client----->pom.xml

   	
   	
   		
   			mongodb-parent
   			com.ittzg.mongodb
   			1.0-SNAPSHOT
   		
   		4.0.0
   
   		mongodb-client
   
   		
   			
   			
   				org.mongodb
   				mongodb-driver
   				3.11.0-beta4
   			
   			
   				junit
   				junit
   				4.12
   			
   		
   	
   

三、代码

1. MDBClientUtil.java

   	package com.ittzg.mongodb;
   
   	import com.alibaba.fastjson.JSON;
   	import com.mongodb.MongoClient;
   	import com.mongodb.client.FindIterable;
   	import com.mongodb.client.MongoCollection;
   	import com.mongodb.client.MongoDatabase;
   	import com.mongodb.client.model.Filters;
   	import org.bson.Document;
   	import org.junit.Before;
   	import org.junit.Test;
   
   	/**
   	 * @email: [email protected]
   	 * @author: ittzg
   	 * @date: 2019/7/11 23:13
   	 */
   	public class MDBClientUtil {
   		MongoDatabase db = null;
   		MongoCollection usersDB =null;
   		@Before
   		public void init(){ //连接mongodb服务器
   			MongoClient mongoDBClient = new MongoClient("127.0.0.1", 27017);    //建立客户端连接
   			db = mongoDBClient.getDatabase("test");                          //获取数据库test
   			usersDB = db.getCollection("users");                                        //获取users集合的操作
   		}
   
   		@Test
   		public void testInsert(){
   			Document doc = new Document("name", "汤姆");
   			doc.append("age",18);
   			doc.append("shuxin","老鼠");
   			usersDB.insertOne(doc); //插入一条数据
   		}
   
   		/**
   		 * 添加一个对象
   		 */
   		@Test
   		public void testInserObj(){
   			User user = new User("杰瑞", 21, "猫");
   			String userJsonStr = JSON.toJSONString(user);   //将对象转为json格式字符串
   			Document doc = Document.parse(userJsonStr);     //解析成文档对象
   			usersDB.insertOne(doc);
   		}
   
   		/**
   		 * 查询一个对象
   		 */
   		@Test
   		public void testFind(){
   			Document doc = usersDB.find().first();//查出users中的第一个文档
   			User user = JSON.parseObject(doc.toJson(), User.class);//将其反序列化成对象
   			System.out.println(user);
   		}
   
   		/**
   		 * 删除一个文档
   		 */
   		@Test
   		public void testDelete(){
   			usersDB.deleteOne(Filters.eq("name","杰瑞"));
   		}
   
   		/**
   		 * 更新一个文档
   		 */
   		@Test
   		public void testUpdate(){
   			FindIterable documents = usersDB.find();
   			for (Document document : documents) {
   				System.out.println(document.toJson());
   			}
   			usersDB.updateOne(Filters.eq("name","杰瑞"), new Document("$set" , new Document("like","play2")) );
   			System.out.println("===============");
   			FindIterable documents2 = usersDB.find();
   			for (Document document : documents2) {
   				System.out.println(document.toJson());
   			}
   		}
   	}
   

2. User.java

   	package com.ittzg.mongodb;
   
   	import org.bson.types.ObjectId;
   
   	/**
   	 * @email: [email protected]
   	 * @author: ittzg
   	 * @date: 2019/7/11 23:26
   	 */
   	public class User {
   
   		private ObjectId _id;
   
   		private String name;
   		private Integer age;
   		private String shuxin;
   
   		public User(String name, Integer age, String shuxin) {
   			this.name = name;
   			this.age = age;
   			this.shuxin = shuxin;
   		}
   
   		public User() {
   		}
   
   		public ObjectId get_id() {
   			return _id;
   		}
   
   		public void set_id(ObjectId _id) {
   			this._id = _id;
   		}
   
   		public String getName() {
   			return name;
   		}
   
   		public void setName(String name) {
   			this.name = name;
   		}
   
   		public Integer getAge() {
   			return age;
   		}
   
   		public void setAge(Integer age) {
   			this.age = age;
   		}
   
   		public String getShuxin() {
   			return shuxin;
   		}
   
   		public void setShuxin(String shuxin) {
   			this.shuxin = shuxin;
   		}
   
   		@Override
   		public String toString() {
   			return "User{" +
   					"_id=" + _id +
   					", name='" + name + '\'' +
   					", age=" + age +
   					", shuxin='" + shuxin + '\'' +
   					'}';
   		}
   	}
   

转载于:https://my.oschina.net/ittzg/blog/3073838