Java

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Util

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;  import org.bson.Document;  import org.bson.conversions.Bson;  import org.bson.types.BasicBSONList;    import java.util.ArrayList;  import java.util.List;  import java.util.Map;    /**  * Created by PeersLee on 2017/1/30.  */  public class MongoUtil {      public static MongoClient client;      public static MongoDatabase db;      public MongoUtil(String dbName) {          client = new MongoClient("127.0.0.1", 27017);          db = client.getDatabase(dbName);          System.out.println(dbName + "连接成功...");      }      //查找(是否存在)      public boolean isDuplicate(String colName, Map<String, String> map) {          // 默认不重复          boolean res = false;          try {              MongoCollection col = db.getCollection(colName);                Document doc = new Document();              for (Map.Entry<String, String>  entry : map.entrySet()) {                  doc.append(entry.getKey(), entry.getValue());              }              FindIterable<Document> findIte = col.find(doc);              MongoCursor<Document> mongoCur = findIte.iterator();              if (mongoCur.hasNext()) {                  // 如果有元素，则重复                  System.out.println("重复...");                  res = true;              }          } catch (Exception e) {              System.err.println(e.getClass().getName() + ": " + e.getMessage());          }          return res;      }      //插入(去重复)      public void insertCol(String colName, Map<String, String> msg) {          try {              MongoCollection col = db.getCollection(colName);              // 将msg 中的信息写入              Document doc = new Document();              for(Map.Entry<String, String> entry : msg.entrySet()) {                  doc.append(entry.getKey(), entry.getValue());              }              // 创建List              List<Document> docs = new ArrayList<Document>();              docs.add(doc);              col.insertMany(docs);              System.out.println("文档已经插入到" + colName + "...");          } catch (Exception e) {              System.out.println(e.getClass().getName() + ":" + e.getMessage());          }      }        //获取一条数据,并标记处理      public String findOne(String colName, Map<String, String> map, String resKey) {          String res = null;          try {              MongoCollection col = db.getCollection(colName);                // 构造查询条件 doc              Document doc = new Document();              for (Map.Entry<String, String>  entry : map.entrySet()) {                  doc.append(entry.getKey(), entry.getValue());              }              // 根据 doc(key、value)查询              FindIterable<Document> findIte = col.find(doc);              MongoCursor<Document> mongoCur = findIte.iterator();              if (mongoCur.hasNext()) {                  // 根据 resKey 返回字段                  res = mongoCur.next().get(resKey).toString();                  System.out.println("MongoDB Return:" + res);              } else {                  res = null;                  System.out.println("MongoDB Return NULL");              }          } catch (Exception e) {              System.err.println(e.getClass().getName() + ": " + e.getMessage());          }          return res;      }      // 更新文档      public void updateOne(String colName, Map<String, String> getMap, Map<String, Object> setMap) {          try {              MongoCollection col = db.getCollection(colName);              // 创建一个List，每个元素是一个比较结果              //extends ArrayList<Object> implements BSONObject              List keys = new BasicBSONList();              for (Map.Entry entry : getMap.entrySet()) {                   keys.add(Filters.eq(entry.getKey().toString(), entry.getValue()));              }              // 将上面的Filters List 结合为一个Bson              Bson filters = Filters.and(keys);              // Document              /*             1. Document(Map<String,Object> map)             2. Document(String key, Object value)             3. Document()              */              col.updateOne(filters, new Document("$set", new Document(setMap)));              //检索查看结果              System.out.println("更新成功...");          } catch (Exception e) {              System.err.println( e.getClass().getName() + ": " + e.getMessage() );          }      }      // 删除一条数据      public void deleteOne(String colName, Map<String, String> map) {          try {              MongoCollection col = db.getCollection(colName);                Document doc = new Document();              for (Map.Entry<String, String>  entry : map.entrySet()) {                  doc.append(entry.getKey(), entry.getValue());              }              // 删除一条数据              col.deleteOne(doc);              System.out.println("成功删除一条数据!");          } catch (Exception e) {              System.err.println(e.getClass().getName() + ": " + e.getMessage());          }      }  }

maven

mongo-java-driver

<dependency>          <groupId>org.mongodb</groupId>          <artifactId>mongo-java-driver</artifactId>          <version>3.4.2</version>      </dependency></pre><br>

其他

package com.mkyong.core;import java.net.UnknownHostException;import java.util.HashMap;import java.util.Map;import com.mongodb.BasicDBObject;import com.mongodb.BasicDBObjectBuilder;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;import com.mongodb.Mongo;import com.mongodb.MongoException;import com.mongodb.util.JSON;/** * Java MongoDB : Insert a Document * */public class InsertDocumentApp {  public static void main(String[] args) {    try {Mongo mongo = new Mongo("localhost", 27017);DB db = mongo.getDB("yourdb");DBCollection collection = db.getCollection("dummyColl");// 1. BasicDBObject exampleSystem.out.println("BasicDBObject example...");BasicDBObject document = new BasicDBObject();document.put("database", "mkyongDB");document.put("table", "hosting");BasicDBObject documentDetail = new BasicDBObject();documentDetail.put("records", 99);documentDetail.put("index", "vps_index1");documentDetail.put("active", "true");document.put("detail", documentDetail);collection.insert(document);DBCursor cursorDoc = collection.find();while (cursorDoc.hasNext()) {System.out.println(cursorDoc.next());}collection.remove(new BasicDBObject());// 2. BasicDBObjectBuilder exampleSystem.out.println("BasicDBObjectBuilder example...");BasicDBObjectBuilder documentBuilder = BasicDBObjectBuilder.start().add("database", "mkyongDB")                .add("table", "hosting");BasicDBObjectBuilder documentBuilderDetail = BasicDBObjectBuilder.start()                .add("records", "99")                .add("index", "vps_index1").add("active", "true");documentBuilder.add("detail", documentBuilderDetail.get());collection.insert(documentBuilder.get());DBCursor cursorDocBuilder = collection.find();while (cursorDocBuilder.hasNext()) {System.out.println(cursorDocBuilder.next());}collection.remove(new BasicDBObject());// 3. Map exampleSystem.out.println("Map example...");Map<String, Object> documentMap = new HashMap<String, Object>();documentMap.put("database", "mkyongDB");documentMap.put("table", "hosting");Map<String, Object> documentMapDetail = new HashMap<String, Object>();documentMapDetail.put("records", "99");documentMapDetail.put("index", "vps_index1");documentMapDetail.put("active", "true");documentMap.put("detail", documentMapDetail);collection.insert(new BasicDBObject(documentMap));DBCursor cursorDocMap = collection.find();while (cursorDocMap.hasNext()) {System.out.println(cursorDocMap.next());}collection.remove(new BasicDBObject());// 4. JSON parse exampleSystem.out.println("JSON parse example...");String json = "{'database' : 'mkyongDB','table' : 'hosting'," +  "'detail' : {'records' : 99, 'index' : 'vps_index1', 'active' : 'true'}}}";DBObject dbObject = (DBObject)JSON.parse(json);collection.insert(dbObject);DBCursor cursorDocJSON = collection.find();while (cursorDocJSON.hasNext()) {System.out.println(cursorDocJSON.next());}collection.remove(new BasicDBObject());    } catch (UnknownHostException e) {e.printStackTrace();    } catch (MongoException e) {e.printStackTrace();    }  }}

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