9.java 操作mongodb插入、读取、修改以及删除基础

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 package mongodb;

 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Set;

 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 MongodbCRUD {
     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:江苏南京】
      * 【name:小张、age:25、address:江苏苏州】
      * @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", "江苏南京");
         dbList.add(doc1);

         BasicDBObject doc2 = new BasicDBObject();
         doc2.put("name", "小张");
         doc2.put("age", 25);
         doc2.put("address", "江苏苏州");
         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("sdap");
             //校验用户密码是否正确
             if (!db.authenticate("sdap", "sdap123".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();
         }
     }

 }