Java Operations MongoDB Database

1: Install MongoDB

(1): Download MongoDB, decompression, create the data directory in the installation directory (and the same as the bin directory), in the data directory to create a DB directory

(2): Start MongoDB. Enter the cmd command line tool, enter the bin directory under the MongoDB installation directory, and enter the command Mongod-dbpath ' {home}/data/db '

(3): Open the browser, enter: http://localhost:27017, show: It looks like you are trying to access MongoDB over HTTP on the native driver port. The description starts successfully.

2: Use Eclipse to create a MAVEN project open operation MongoDB Database. Pom.xml files are as follows:

<project xmlns= "http://maven.apache.org/POM/4.0.0" xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xsi: schemalocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd" > <modelversion >4.0.0</modelVersion> <groupId>com.chu</groupId> <artifactid>mongotest</artifactid > <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>mongotest
      Maven webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</ version> <scope>test</scope> </dependency> <dependency> <groupi D>org.mongodb</groupid> <artifactId>mongo-java-driver</artifactId> <version>2.10.1&lt
    
    
  ;/version> </dependency>  <dependency> <groupId>org.codehaus.jackson</groupId> <artifactid>jackson-core-asl</ artifactid> <version>1.9.9</version> </dependency> <dependency> &LT;GROUPID&G T;org.codehaus.jackson</groupid> <artifactId>jackson-mapper-asl</artifactId> <version>1. 9.9</version> </dependency> </dependencies> <build> <finalname>mo
 Ngotest</finalname> </build> </project>

The

Java code is as follows:

Package com.mongo.action;
Import java.net.UnknownHostException;

Import java.util.List;
Import Com.mongo.po.User;

Import Com.mongo.service.UserService;
	
	
	public class Useraction {private UserService userservice = new UserService ();
		public void Save () throws unknownhostexception{User user = new user ();
		User.setid (1);
		User.setname ("Jinhui");
		User.setaddress ("Beijing");
	This.userService.save (user);
		public void Update () throws unknownhostexception{User user = new user ();
		User.setid (1);
		User.setname ("Manman");
		User.setaddress ("Hebei");
	This.userService.update (user);
	Public list<user> FindAll () throws unknownhostexception{return This.userService.findAll ();
	public void Remove () throws unknownhostexception{This.userService.remove (1);
		
		public static void Main (string[] args) throws Unknownhostexception {useraction useraction = new Useraction ();
		
Useraction.save ();
		
Useraction.update ();
		
		Useraction.remove ();list<user> list = Useraction.findall ();
		for (user user:list) {System.out.println (user);
 }
	}
	
}

Package com.mongo.service;

Import java.net.UnknownHostException;
Import java.util.List;

Import Com.mongo.dao.UserDao;
Import Com.mongo.po.User;

public class UserService {

	private Userdao Userdao = new Userdao ();
	
	/** *
	 Save *
	 @param user
	 * @throws unknownhostexception
	 /public
	void Save (user user) throws unknownhostexception{
		this.userDao.save (user);
	}
	
	
	
	/** *
	 Update
	 * @param user
	 * @throws unknownhostexception
	/public void update (user user) throws unknownhostexception {
		this.userDao.update (user);
	}
	
	/** *
	 Query All
	 * @return *
	 @throws unknownhostexception 
	 /public
	list<user> FindAll () Throws unknownhostexception{return
		this.userDao.findAll ();
	}
	
	
	/** *
	 Delete operation
	 * @param ID
	 * @throws unknownhostexception
	/public void remove (int id) throws unknownhostexception{
		this.userDao.remove (ID);
	}
	
}

Package Com.mongo.dao;
Import java.net.UnknownHostException;
Import java.util.ArrayList;

Import java.util.List;
Import Com.mongo.po.User;
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.util.JSON; public class Userdao {/** * save * @param user * @throws unknownhostexception/public void Save (user user) thr
		oWS unknownhostexception {Mongo Mongo = new Mongo ();
		DB Mymongo = Mongo.getdb ("Mymongo");

		Dbcollection usercollection = mymongo.getcollection ("user");
		DBObject dbo = (dbobject) json.parse (User.tojson ());
	Usercollection.insert (dbo); /** * UPDATE * @param user * @throws unknownhostexception/public void update (user user) throws Unknownhostexce
		ption {Mongo Mongo = new Mongo ();
		DB Mymongo = Mongo.getdb ("Mymongo");

		Dbcollection usercollection = mymongo.getcollection ("user"); Basicdbobject basedbo =New Basicdbobject ();
		
		Basedbo.put ("id", User.getid ());
		
		DBObject newdbo = (dbobject) json.parse (User.tojson ());
	Usercollection.update (basedbo, newdbo); /** * Query All * @return * @throws unknownhostexception/public list<user> FindAll () throws Unknownhost
		exception{Mongo Mongo = new Mongo ();
		DB Mymongo = Mongo.getdb ("Mymongo");
		Dbcollection usercollection = mymongo.getcollection ("user");
        
        Dbcursor Cursor=usercollection.find ();
        list<user> userlist = new arraylist<user> ();
             while (Cursor.hasnext ()) {User user = new user ();
             User.parse (Cursor.next ());
        Userlist.add (user);
	return userlist; /** * Delete operation * @param ID * @throws unknownhostexception/public void remove (int id) throws Unknownhostexce
		ption{Mongo Mongo = new Mongo ();
		DB Mymongo = Mongo.getdb ("Mymongo");
		
		
		Dbcollection usercollection = mymongo.getcollection ("user"); Basicdbobject BASEdbo =new basicdbobject ();

        Basedbo.put ("id", id);
	Delete a record usercollection.remove (basedbo);
 }
	

}

Package Com.mongo.po;

Import Com.mongo.utils.JsonUtils;
Import Com.mongodb.DBObject;

public class User {

	private int id;
	private String name;
	Private String address;
	
	
	public int getId () {return
		ID;
	}
	public void setId (int id) {
		this.id = ID;
	}
	Public String GetName () {return
		name;
	}
	public void SetName (String name) {
		this.name = name;
	}
	Public String getaddress () {return address
		;
	}
	public void setaddress (String address) {
		this.address = address;
	}
	
	
	Public String Tojson () {return
		Jsonutils.tojson (this);
	}
	
	public void Parse (DBObject dbo) {
		This.setid ((Integer) dbo.get ("id");
		This.setname ((String) dbo.get ("name"));
		This.setaddress ((String) dbo.get ("Address");
	}
	
	
	Public String toString () {return
		' ID: ' +id+ ', Name: ' +name+ ', Address: ' +address
	}
}

Package com.mongo.utils;

Import Java.io.OutputStream;
Import Org.codehaus.jackson.map.ObjectMapper;


Import org.codehaus.jackson.type.TypeReference;  /** * JSON conversion tool that enables conversion between Java objects and JSON strings <br/> * */public class Jsonutils {static Objectmapper Objectmapper =

	New Objectmapper (); /** * Java object converted to JSON in stream * * @param obj * @param out/public static String Tojson (Object obj) {string s
		= "";
		try {s = objectmapper.writevalueasstring (obj);
		catch (Exception e) {e.printstacktrace ();
	return s; /** * Java object converted to JSON in stream * * @param obj * @param out/public static void Tojson (Object obj, Outputstrea
		m out) {try {objectmapper.writevalue (out, obj);
		catch (Exception e) {e.printstacktrace (); }/** * JSON to Java Object * * @param json * @param obj/@SuppressWarnings ({"Rawtypes", "Unchecked"}) Pub Lic static void Fromjson (String json, Object obj, Class valuetype) {try {obj = Objectmapper.readvAlue (JSON, valuetype);
		catch (Exception e) {e.printstacktrace (); }/** * JSON to Java Object * @param json * @param obj * @param valuetyperef * * @SuppressWarnings ("Rawtypes") p ublic static void Fromjson (String json, Object obj, typereference valuetyperef) {try {obj = Objectmapper.readvalue (
		JSON, VALUETYPEREF);
		catch (Exception e) {e.printstacktrace (); }/** * JSON to Java Object * * @param json * @param obj/@SuppressWarnings ({"Rawtypes", "Unchecked"}) Pub
		Lic static object Fromjson (String json, Class valuetype) {Object obj = null;
		try {obj = Objectmapper.readvalue (JSON, valuetype);
		catch (Exception e) {e.printstacktrace ();
	return obj; /** * JSON to Java Object * * @param json * @param obj * @param valuetyperef/@SuppressWarnings ({"Rawtypes") , "hiding"}) public static <Object> Object Fromjson (String json, typereference valuetyperef) {Object obj = null
		; try {obj = Objectmapper.reaDvalue (JSON, VALUETYPEREF);
		catch (Exception e) {e.printstacktrace ();
	return obj;
 }
}

3: Use the Client tool to view the data: