三、Mongodb Java中的使用

添加maven依赖

org.mongodb
mongodb-driver
3.6.4



org.mongodb
mongo-java-driver
3.6.4

junit
junit
RELEASE

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 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 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 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 collection = database.getCollection("user");
  System.out.println("get table successful");

  //执行查询
  FindIterable 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 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 collection = database.getCollection("user");
  System.out.println("get table successful");
  //执行删除
  collection.deleteMany(Filters.eq("name", "赵八"));
  }