mongodb-java-driver基本用法

1、先下载mongodb-java-driver目前最新版本是2.9.3

2、下面是基本的CRUD示例代码:

1package https://www.360docs.net/doc/d13298335.html,blogs.yjmyzz.cache.test;

2

3import com.google.gson.Gson;

4import com.mongodb.BasicDBObject;

5import com.mongodb.DB;

6import com.mongodb.DBCollection;

7import com.mongodb.DBCursor;

8import com.mongodb.DBObject;

9import com.mongodb.Mongo;

10import com.mongodb.util.JSON;

11

12import https://www.360docs.net/doc/d13298335.html,.UnknownHostException;

13import java.util.Calendar;

14import java.util.Date;

15import java.util.HashMap;

16import java.util.HashSet;

17import java.util.Map;

18import java.util.Set;

19

20import org.junit.Test;

21

22public class TestMongoDriver {

23

24 @Test

25public void testCRUD() throws UnknownHostException { 26// 连接到mongodb

27 Mongo mongo = new Mongo("localhost", 27017);

28

29// 打开数据库test

30 DB db = mongo.getDB("test");

31

32// 遍历所有集合的名字

33 Set colls = db.getCollectionNames();

34for (String s : colls) {

35 System.out.println(s);

36// 先删除所有Collection(类似于关系数据库中的"表")

37if (!s.equals("system.indexes")) {

38 db.getCollection(s).drop();

39 }

40 }

41

42// 取得集合emp(若：emp不存在，mongodb将自动创建该集合) 43 DBCollection coll = db.getCollection("emp");

44

45// delete all

46 DBCursor dbCursor = coll.find();

47for (DBObject dbObject : dbCursor) {

48 coll.remove(dbObject);

49 }

50

51// create

52 BasicDBObject doc = new BasicDBObject("name", "杨俊明").append("sex", "男")

53 .append("address",

54new BasicDBObject("postcode", "201202").append(

55 "street", "田林路888号

").append("city", "上海"));

56 coll.insert(doc);

57

58// retrieve

59 BasicDBObject docFind = new BasicDBObject("name", "杨俊明");

60 DBObject findResult = coll.findOne(docFind);

61 System.out.println(findResult);

62

63// update

64 doc.put("sex", "MALE");// 把sex属性从"男"，改成"MALE"

65 coll.update(docFind, doc);

66 findResult = coll.findOne(docFind);

67 System.out.println(findResult);

68

69 coll.dropIndexes();// 先删除所有索引

70// create index

71 coll.createIndex(new BasicDBObject("name", 1)); // 1代表升序

72

73// 复杂对象

74 UserData userData = new UserData("jimmy", "123456");

75 Set pets = new HashSet();

76 pets.add("cat");

77 pets.add("dog");

78 Map favoriteMovies = new HashMap();

79 favoriteMovies.put("dragons", "Dragons II");

80 favoriteMovies.put("avator", "Avator I");

81 userData.setFavoriteMovies(favoriteMovies);

82 userData.setPets(pets);

83 userData.setBirthday(getDate(1990, 5, 1));

84 BasicDBObject objUser = new BasicDBObject("key", "jimmy").append(

85 "value", toDBObject(userData));

86 coll.insert(objUser);

87 System.out.println(coll.findOne(objUser));

88 }

89

90/**

91 * 将普通Object对象转换成mongodb的DBObject对象

92 *

93 * @param obj

94 * @return

95*/

96private DBObject toDBObject(Object obj) {

97 Gson gson = new Gson();

98 String json = gson.toJson(obj);

99return (DBObject) JSON.parse(json);

100 }

101

102/**

103 * 获取指定日期

104 *

105 * @param year

106 * @param month

107 * @param day

108 * @return

109*/

110private Date getDate(int year, int month, int day) { 111 Calendar calendar = Calendar.getInstance();

112 calendar.clear();

113 calendar.set(year, month - 1, day);

114return calendar.getTime();

115

116 }

117

118 }

其中，为了演示复杂对象的持久化，类UserData定义如下：

package https://www.360docs.net/doc/d13298335.html,blogs.yjmyzz.cache.test;

import java.io.Serializable;

import java.util.Date;

import java.util.Map;

import java.util.Set;

public class UserData implements Serializable {

private static final long serialVersionUID = -4770493237851400594L;

private String userName;

private String password;

private Set pets;

private Map favoriteMovies;

private Date birthday;

public UserData() {

public UserData(String userName, String passWord) {

https://www.360docs.net/doc/d13298335.html,erName = userName;

this.password = passWord;

}

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

https://www.360docs.net/doc/d13298335.html,erName = userName;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public Set getPets() {

return pets;

}

public void setPets(Set pets) {

this.pets = pets;

}

public Map getFavoriteMovies() {

return favoriteMovies;

}

public void setFavoriteMovies(Map favoriteMovies) {

this.favoriteMovies = favoriteMovies;

public Date getBirthday() {

return birthday;

}

public void setBirthday(Date birthday) {

this.birthday = birthday;

}

}

运行效果如下：

emp

system.indexes

{ "_id" : { "$oid" : "53d34795744ec171e7f6980a"} , "name" : "杨俊明" , "sex" : "男" , "address" : { "postcode" : "201202" , "street" : "田林路888号" , "city" : "上海"}}

{ "_id" : { "$oid" : "53d34795744ec171e7f6980a"} , "name" : "杨俊明" , "sex" : "MALE" , "address" : { "postcode" : "201202" , "street" : "田林路888号" , "city" : "上海"}}

{ "_id" : { "$oid" : "53d34796744ec171e7f6980b"} , "key" : "jimmy" , "value" : { "userName" : "jimmy" , "password" : "123456" , "pets" : [ "cat" , "dog"] , "favoriteMovies" : { "dragons" : "Dragons II" , "avator" : "Avator I"} , "birthday" : "May 1, 1990 12:00:00 AM"}}

延伸阅读：

mondodb-java-driver 官方在线文档

8天学通mongodb系列

MongoDB基本用法