Java操作Mongodb数据库实现数据的增删查改功能示例

本文实例讲述了Java操作Mongodb数据库实现数据的增删查改功能。分享给大家供大家参考，具体如下：

首先，我们在windows下安装mongodb数据库，安装教程可查看前面一篇文章：https://www.aspxhome.com/article/85605.htm

代码如下：

package io.mogo;
import java.util.Map;
import org.apache.commons.lang3.StringUtils;
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.WriteResult;
/**
* Hello world!
*
*/
public class App
{
 private static final String host = "localhost";
 private static final int port = 27017;
 private static final String userName = "";
 private static final String password = "";
 private static final String dataBaseName = "test";
 private static DB db;
 public static void main( String[] args ) throws Exception
 {
   System.out.println( "Hello World!" );
   connMongoDB();
   find("person", "name", "xiaoming");
   DBObject newObj = new BasicDBObject();
   newObj.put("name", "xiaoming");
   newObj.put("desc", "i am xiaoming");
   update("person", "name", "xiaoming", newObj);
   find("person", "name", "xiaoming");
 }
 public static void connMongoDB() throws Exception {
   Mongo mongo = new Mongo(host, port);
   db = mongo.getDB(dataBaseName);
   if (!StringUtils.isEmpty(userName) || !StringUtils.isEmpty(password)) {
     db.authenticate(userName, password.toCharArray());
   }
 }
 public static void find(String tableName, String key, String value){
  DBObject obj = new BasicDBObject();
  obj.put(key, value);
  DBCollection dbCollection = db.getCollection(tableName);
  DBCursor dbCursor = dbCollection.find(obj);
  while(dbCursor.hasNext()){
    Map map = (Map)dbCursor.next();
    System.out.println(map);
  }
 }
 public static boolean delete(String tableName, String key, String value){
   DBObject obj = new BasicDBObject();
   obj.put(key, value);
   DBCollection dbCollection = db.getCollection(tableName);
   WriteResult result = dbCollection.remove(obj);
   if(result.getN() > 0){
     System.out.println("删除数据成功！");
     return true;
   }else{
     return false;
   }
 }
 public static boolean insert(String tableName, DBObject obj){
   DBCollection dbCollection = db.getCollection(tableName);
   long num = dbCollection.count();
   dbCollection.insert(obj);
   if(dbCollection.count() - num > 0){
     System.out.println("插入数据成功！");
     return true;
   }else{
     return false;
   }
 }
 public static boolean update(String tableName, String key, String value, DBObject newValue){
   DBObject obj = new BasicDBObject();
   obj.put(key, value);
   DBCollection dbCollection = db.getCollection(tableName);
   DBObject oldValue = dbCollection.findOne(obj);
   WriteResult result = dbCollection.update(oldValue, newValue);
   if(result.getN() > 0){
     System.out.println("数据更新成功！");
     return true;
   }else
     return false;
 }
}

附：完整实例代码点击此处本站下载。

希望本文所述对大家java程序设计有所帮助。

来源：http://blog.csdn.net/zwc2xm/article/details/72869590