mongodb实现简单的增删改查

  package mongoDB;
  import java.net.UnknownHostException;
  import java.util.ArrayList;   
  import java.util.List;
  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.MongoException;  
    
 /**
  * java
  * mongodb的数据插入、读取、更新、删除
  */  
  public class test{
     private static Mongo m = null;  
     private static DB db = null;  
       
     //数据集合名称  
     private static final String COLLECTION_NAME = "mcpang";  
   
     /*
      * 测试java处理mongodb的增、删、改、查操作
      */  
     public static void main(String[] args) {  
         //获取数据库连接  
         startMongoDBConn();  
         //保存数据  
         createColData();  
         //读取数据  
         readColData();  
         //更新数据  
         updateColData();  
         //读取数据  
         readColData();  
         //删除数据  
         deleteColData();  
         //读取数据  
         readColData();  
         //删除数据集  
         db.getCollection(COLLECTION_NAME).drop();  
        //关闭数据库连接  
         stopMondoDBConn();  
           
           
     }  
       
     /**
      * 数据插入
      * 测试数据：
      * 【name:小李、age:30、address:北京】
      * 【name:小张、age:25、address:天津】
      * @return  
      */  
     private static void createColData(){  
         DBCollection dbCol = db.getCollection(COLLECTION_NAME);  
         System.out.println("向数据集中插入数据开始：");  
         List<DBObject> dbList = new ArrayList<DBObject>();  
         BasicDBObject doc1 = new BasicDBObject();  
         doc1.put("name", "小李");  
         doc1.put("age", 30);  
         doc1.put("address", "北京");  
         dbList.add(doc1);  
           
        BasicDBObject doc2 = new BasicDBObject();  
        doc2.put("name", "小张");  
        doc2.put("age", 25);  
        doc2.put("address", "天津");  
        dbList.add(doc2);  
          
        dbCol.insert(dbList);  
        System.out.println("向数据集中插入数据完成！");  
        System.out.println("------------------------------");  
    }  
      
    /**
     * 数据读取
     */  
    private static void readColData(){  
        DBCollection dbCol = db.getCollection(COLLECTION_NAME);  
        DBCursor ret = dbCol.find();  
        System.out.println("从数据集中读取数据：");  
        while(ret.hasNext()){  
            BasicDBObject bdbObj = (BasicDBObject) ret.next();  
            if(bdbObj != null){  
                System.out.println("name:"+bdbObj.getString("name"));  
                System.out.println("age:"+bdbObj.getInt("age"));  
                System.out.println("address:"+bdbObj.getString("address"));  
            }  
        }  
    }  
      
    /**
     * 数据更新
     * update(q, o, upsert, multi)
     * update(q, o, upsert, multi, concern)
     * update(arg0, arg1, arg2, arg3, arg4, arg5)
     * updateMulti(q, o)
     */  
    private static void updateColData(){  
        System.out.println("------------------------------");  
        DBCollection dbCol = db.getCollection(COLLECTION_NAME);  
        DBCursor ret = dbCol.find();  
        BasicDBObject doc = new BasicDBObject();  
        BasicDBObject res = new BasicDBObject();  
        res.put("age", 40);  
        System.out.println("将数据集中的所有文档的age修改成40！");  
        doc.put("$set", res);  
       dbCol.update(new BasicDBObject(),doc,false,true);  
        System.out.println("更新数据完成！");  
        System.out.println("------------------------------");  
    }  
      
    /**
     * 数据删除
     */  
    private static void deleteColData(){  
        System.out.println("------------------------------");  
       DBCollection dbCol = db.getCollection(COLLECTION_NAME);  
        System.out.println("删除【小李】！");  
        BasicDBObject doc = new BasicDBObject();  
        doc.put("name", "小李");  
        dbCol.remove(doc);  
        System.out.println("------------------------------");  
    }  
      
    /**
     * 关闭mongodb数据库连接
     */  
    private static void stopMondoDBConn(){  
        if (null != m) {  
            if (null != db) {  
                // 结束Mongo数据库的事务请求  
                try {  
                    db.requestDone();  
                } catch(Exception e) {  
                    e.printStackTrace();  
                }  
           }  
            try  
            {  
                m.close();  
            } catch(Exception e) {  
                e.printStackTrace();  
            }  
            m = null;  
            db = null;  
        }  
    }  
      
    /**
     * 获取mongodb数据库连接
     */  
    private static void startMongoDBConn(){  
        try {  
            //Mongo(p1, p2):p1=>IP地址     p2=>端口  
            m = new Mongo("127.0.0.1", 27017);  
            //根据mongodb数据库的名称获取mongodb对象  
            db = m.getDB("yyl");  
            //校验用户密码是否正确  
            if (!db.authenticate("yyl", "yyl123".toCharArray())){  
                System.out.println("连接MongoDB数据库,校验失败！");  
            }else{  
                System.out.println("连接MongoDB数据库,校验成功！");  
            }  
        } catch (UnknownHostException e) {  
            e.printStackTrace();  
        } catch (MongoException e) {  
            e.printStackTrace();  
        }  
    }  
}