MangoDB在java中的实现

• 国内 mongodb-driver jar 下载地址：http://central.maven.org/maven2/org/mongodb/mongo-java-driver/
• 1.链接数据库

• import com.mongodb.MongoClient;import com.mongodb.client.MongoDatabase;public class MongoDBJDBC{   public static void main( String args[] ){      try{          // 连接到 mongodb 服务         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );                // 连接到数据库         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");         System.out.println("Connect to database successfully");              }catch(Exception e){        System.err.println( e.getClass().getName() + ": " + e.getMessage() );     }   }}

  
  2.实现登录认证

• import java.util.ArrayList;  import java.util.List;  import com.mongodb.MongoClient;  import com.mongodb.MongoCredential;  import com.mongodb.ServerAddress;  import com.mongodb.client.MongoDatabase;    public class MongoDBJDBC {      public static void main(String[] args){          try {              //连接到MongoDB服务 如果是远程连接可以替换“localhost”为服务器所在IP地址              //ServerAddress()两个参数分别为 服务器地址 和 端口              ServerAddress serverAddress = new ServerAddress("localhost",27017);              List<ServerAddress> addrs = new ArrayList<ServerAddress>();              addrs.add(serverAddress);                            //MongoCredential.createScramSha1Credential()三个参数分别为 用户名 数据库名称 密码              MongoCredential credential = MongoCredential.createScramSha1Credential("username", "databaseName", "password".toCharArray());              List<MongoCredential> credentials = new ArrayList<MongoCredential>();              credentials.add(credential);                            //通过连接认证获取MongoDB连接              MongoClient mongoClient = new MongoClient(addrs,credentials);                            //连接到数据库              MongoDatabase mongoDatabase = mongoClient.getDatabase("databaseName");              System.out.println("Connect to database successfully");          } catch (Exception e) {              System.err.println( e.getClass().getName() + ": " + e.getMessage() );          }      }  } 

  
  3.创建集合

• import com.mongodb.MongoClient;import com.mongodb.client.MongoDatabase;public class MongoDBJDBC{   public static void main( String args[] ){      try{         // 连接到 mongodb 服务      MongoClient mongoClient = new MongoClient( "localhost" , 27017 );                      // 连接到数据库      MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");        System.out.println("Connect to database successfully");      mongoDatabase.createCollection("test");      System.out.println("集合创建成功");              }catch(Exception e){        System.err.println( e.getClass().getName() + ": " + e.getMessage() );     }   }}

  
  4.获取集合

• import org.bson.Document;import com.mongodb.MongoClient;import com.mongodb.client.MongoCollection;import com.mongodb.client.MongoDatabase;public class MongoDBJDBC{   public static void main( String args[] ){      try{          // 连接到 mongodb 服务         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );                // 连接到数据库         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");         System.out.println("Connect to database successfully");             MongoCollection<Document> collection = mongoDatabase.getCollection("test");       System.out.println("集合 test 选择成功");      }catch(Exception e){        System.err.println( e.getClass().getName() + ": " + e.getMessage() );     }   }}

  5.插入文档

  import java.util.ArrayList;import java.util.List;import org.bson.Document;import com.mongodb.MongoClient;import com.mongodb.client.MongoCollection;import com.mongodb.client.MongoDatabase;public class MongoDBJDBC{   public static void main( String args[] ){      try{            // 连接到 mongodb 服务         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );                  // 连接到数据库         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");           System.out.println("Connect to database successfully");                  MongoCollection<Document> collection = mongoDatabase.getCollection("test");         System.out.println("集合 test 选择成功");         //插入文档           /**          * 1. 创建文档 org.bson.Document 参数为key-value的格式          * 2. 创建文档集合List<Document>          * 3. 将文档集合插入数据库集合中 mongoCollection.insertMany(List<Document>) 插入单个文档可以用 mongoCollection.insertOne(Document)          * */         Document document = new Document("title", "MongoDB").           append("description", "database").           append("likes", 100).           append("by", "Fly");           List<Document> documents = new ArrayList<Document>();           documents.add(document);           collection.insertMany(documents);           System.out.println("文档插入成功");        }catch(Exception e){         System.err.println( e.getClass().getName() + ": " + e.getMessage() );      }   }}

  6.检索所有文档

• import org.bson.Document;import com.mongodb.MongoClient;import com.mongodb.client.FindIterable;import com.mongodb.client.MongoCollection;import com.mongodb.client.MongoCursor;import com.mongodb.client.MongoDatabase;public class MongoDBJDBC{   public static void main( String args[] ){      try{            // 连接到 mongodb 服务         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );                  // 连接到数据库         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");           System.out.println("Connect to database successfully");                  MongoCollection<Document> collection = mongoDatabase.getCollection("test");         System.out.println("集合 test 选择成功");                  //检索所有文档           /**          * 1. 获取迭代器FindIterable<Document>          * 2. 获取游标MongoCursor<Document>          * 3. 通过游标遍历检索出的文档集合          * */           FindIterable<Document> findIterable = collection.find();           MongoCursor<Document> mongoCursor = findIterable.iterator();           while(mongoCursor.hasNext()){              System.out.println(mongoCursor.next());           }              }catch(Exception e){         System.err.println( e.getClass().getName() + ": " + e.getMessage() );      }   }}

  
  7.更新文档

• import org.bson.Document;import com.mongodb.MongoClient;import com.mongodb.client.FindIterable;import com.mongodb.client.MongoCollection;import com.mongodb.client.MongoCursor;import com.mongodb.client.MongoDatabase;import com.mongodb.client.model.Filters;public class MongoDBJDBC{   public static void main( String args[] ){      try{            // 连接到 mongodb 服务         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );                  // 连接到数据库         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");           System.out.println("Connect to database successfully");                  MongoCollection<Document> collection = mongoDatabase.getCollection("test");         System.out.println("集合 test 选择成功");                  //更新文档   将文档中likes=100的文档修改为likes=200            collection.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));           //检索查看结果           FindIterable<Document> findIterable = collection.find();           MongoCursor<Document> mongoCursor = findIterable.iterator();           while(mongoCursor.hasNext()){              System.out.println(mongoCursor.next());           }              }catch(Exception e){         System.err.println( e.getClass().getName() + ": " + e.getMessage() );      }   }}

  
  8.删除文档

• import org.bson.Document;import com.mongodb.MongoClient;import com.mongodb.client.FindIterable;import com.mongodb.client.MongoCollection;import com.mongodb.client.MongoCursor;import com.mongodb.client.MongoDatabase;import com.mongodb.client.model.Filters;public class MongoDBJDBC{   public static void main( String args[] ){      try{            // 连接到 mongodb 服务         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );         // 连接到数据库         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");           System.out.println("Connect to database successfully");         MongoCollection<Document> collection = mongoDatabase.getCollection("test");         System.out.println("集合 test 选择成功");         //删除符合条件的第一个文档           collection.deleteOne(Filters.eq("likes", 200));           //删除所有符合条件的文档           collection.deleteMany (Filters.eq("likes", 200));           //检索查看结果           FindIterable<Document> findIterable = collection.find();           MongoCursor<Document> mongoCursor = findIterable.iterator();           while(mongoCursor.hasNext()){             System.out.println(mongoCursor.next());           }                   }catch(Exception e){        System.err.println( e.getClass().getName() + ": " + e.getMessage() );     }   }}

  
  
  
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