三、Mongodb Java中的使用

添加maven依赖

<!--mongodb 驱动-->
<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.6.4</version>
</dependency>
<!--mongodb Java 驱动-->
<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>3.6.4</version>
</dependency>

<!--单元测试支持-->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>RELEASE</version>
</dependency>

连接方式

 /**
 * 无权限的连接方式
 */
@Test
public void noAuthConnection(){
    try{
        //通过连接认证获取MongoDB连接
        MongoClient client = new MongoClient("127.0.0.1", 27017);
        // 连接到数据库: 如果指定的数据库不存在，mongo会自动创建数据库
        MongoDatabase database = client.getDatabase("DEMO");
        System.out.println("Mongodb connection successful...");
        //创建一个集合（可以理解为创建一张表）
        database.createCollection("user");
    }catch (Exception e){
        e.printStackTrace();
    }
}


/**
 * 权限认证的方式
 */
@Test
public void authConnection(){
    try{
        // 连接到 mongodb 服务
        ServerAddress addr = new ServerAddress("127.0.0.1", 27017);

        // 设置权限认证：三个参数分别为 用户名 数据库名称 密码
        MongoCredential credential  = MongoCredential.createScramSha1Credential("demo", "DEMO", "demo123456".toCharArray());

        //mongo的参数设置, 如最大连接、超时时间等
        MongoClientOptions options = MongoClientOptions.builder().build();

        //通过连接认证获取MongoDB连接
        MongoClient client = new MongoClient(addr, credential, options);

        // 连接到数据库: 如果指定的数据库不存在，mongo会自动创建数据库
        MongoDatabase database = client.getDatabase("DEMO");
        System.out.println("Mongodb connection successful...");

        //创建一个集合（可以理解为创建一张表）
        database.createCollection("user");
    }catch (Exception e){
        e.printStackTrace();
    }

}

/**
 * 权限认证的方式2
 */
@Test
public void authConnectionByUri(){
    try{
        MongoClientURI uri = new MongoClientURI("mongodb://demo:demo123456@127.0.0.1:27017/DEMO");
        //通过连接认证获取MongoDB连接
        MongoClient client = new MongoClient(uri);

        // 连接到数据库: 如果指定的数据库不存在，mongo会自动创建数据库
        MongoDatabase database = client.getDatabase("DEMO");
        System.out.println("Mongodb connection successful...");

        //创建一个集合
        database.createCollection("add_table");
    }catch (Exception e){
        e.printStackTrace();
    }

}

举几个个栗子

先封装一个简单的连接工具类

public class MongoDBJDBC {

    private MongoClient client;
    private MongoDatabase database;

    public MongoClient getClient(){
        return this.client;
    }

    public MongoDatabase getDatabase(){
        return this.database;
    }

    public MongoDBJDBC(){
        try{
            // 连接到 mongodb 服务
            ServerAddress addr = new ServerAddress("127.0.0.1", 27017);

            // 设置权限认证：三个参数分别为 用户名 数据库名称 密码
            MongoCredential credential  = MongoCredential.createScramSha1Credential("demo", "DEMO", "demo123456".toCharArray());

            //mongo的参数设置, 如最大连接、超时时间等
            MongoClientOptions options = MongoClientOptions.builder().build();

            //通过连接认证获取MongoDB连接
            client = new MongoClient(addr, credential, options);

            // 连接到数据库: 如果指定的数据库不存在，mongo会自动创建数据库
            database = client.getDatabase("DEMO");
            System.out.println("Mongodb connection successful...");

        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

}

• 添加、获取 集合

 @Test
 public void addAndGetTable(){
     MongoDBJDBC mongoDBJDBC = new MongoDBJDBC();
     MongoDatabase database = mongoDBJDBC.getDatabase();
     //添加集合
     database.createCollection("add_table");
     System.out.println("add table successful");
     //获取集合
     MongoCollection<Document> collection = database.getCollection("add_table");
     System.out.println("get table successful");
 }   

• 添加文档

 @Test
 public void insertData(){
     MongoDBJDBC mongoDBJDBC = new MongoDBJDBC();
     MongoDatabase database = mongoDBJDBC.getDatabase();
     //获取集合
     MongoCollection<Document> collection = database.getCollection("user");
     System.out.println("get table successful");

     //创建文档
     Document document = new Document()
             .append("name", "张三")
             .append("age",  23)
             .append("sex", "男")
             .append("description", "this is a bad boy!");

     //插入到数据库
     collection.insertOne(document);//插入单条数据

     List<Document> list = new ArrayList<>();
     Document document1 = new Document()
             .append("name", "李四")
             .append("age",  6)
             .append("sex", "男")
             .append("description", "this is a good boy!");
     Document document2 = new Document()
             .append("name", "赵八")
             .append("age",  15)
             .append("sex", "男")
             .append("description", "this is a bad boy!");
     list.add(document1);
     list.add(document2);
     collection.insertMany(list);//插入多条条数据
}

• 检索所有文档

  @Test
  public void findAllDoc(){
      MongoDBJDBC mongoDBJDBC = new MongoDBJDBC();
      MongoDatabase database = mongoDBJDBC.getDatabase();

      //获取集合
      MongoCollection<Document> collection = database.getCollection("user");
      System.out.println("get table successful");

      //执行查询
      FindIterable<Document> findIterable = collection.find();
      for (Document aFindIterable : findIterable) {
          System.out.println(aFindIterable.toString());
      }
  }    

• 更新文档

  @Test
  public void updateDoc(){
      MongoDBJDBC mongoDBJDBC = new MongoDBJDBC();
      MongoDatabase database = mongoDBJDBC.getDatabase();
      //获取集合
      MongoCollection<Document> collection = database.getCollection("user");
      System.out.println("get table successful");
      //更新文档   将文档中name= 赵八 的文档修改为description= this is a good boy!
      collection.updateMany(Filters.eq("name", "赵八"), new Document("$set",new Document("description","this is a good boy!")));
  } 

• 删除文档

@Test
public void delDoc(){
    MongoDBJDBC mongoDBJDBC = new MongoDBJDBC();
    MongoDatabase database = mongoDBJDBC.getDatabase();
    //获取集合
    MongoCollection<Document> collection = database.getCollection("user");
    System.out.println("get table successful");
    //执行删除
    collection.deleteMany(Filters.eq("name", "赵八"));
}