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();
        }
    }
}