这是pom
.xml文件：<?xml version="1
.0" encoding="UTF-8"?>
<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/xsd/maven-4
.0
.0
.xsd">
<modelVersion>4
.0
.0</modelVersion>
<groupId>org
.example</groupId>
<artifactId>nosql_chapter06</artifactId>
<version>1
.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org
.apache
.maven
.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<
!--单元测试依赖-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4
.12</version>
</dependency>
<
!--
java操作mongoDB的驱动依赖-->
<dependency>
<groupId>org
.mongodb</groupId>
<artifactId>mongo-
java-driver</artifactId>
<version>3
.12
.1</version>
</dependency>
</dependencies>
</project>
这是mongodb
.properties:
host1=192
.168
.85
.101
host2=192
.168
.85
.102
host3=192
.168
.85
.103
port=27017
username=itcastAdmin
password=123456
source=admin
dbname=testfiles
这是MongoUtils
.java
package com
.itcast
.mongodb;
import com
.mongodb
.MongoClientSettings;
import com
.mongodb
.MongoCredential;
import com
.mongodb
.ServerAddress;
import com
.mongodb
.client
.MongoClient;
import com
.mongodb
.client
.MongoClients;
import com
.mongodb
.client
.MongoDatabase;
import com
.mongodb
.client
.gridfs
.GridFSBucket;
import com
.mongodb
.client
.gridfs
.GridFSBuckets;
import java.io
.IOException;
import java.io
.InputStream;
import java.util
.Arrays;
import java.util
.Properties;
public
class MongoUtils {
private static Properties properties;
private static InputStream stream = null;
private static String host1;
private static String host2;
private static String host3;
private static String port;
private static String dbname;
private static String username;
private static String password;
private static String source;
//1
.创建一个静态代码块，用于初始化工具类中的静态变量，该静态代码块在类加载过程中的初始化阶段执行，并且只执行一次
static {
//判断properties集合对象是否为空，为空则创建一个集合对象
if (properties == null) {
properties = new Properties();
}
/* 由于我们调用load方法，而load方法底层抛出了一个IOException异常，此异常为编译 时期异常。所以，我们调用load方法时，需要处理底层抛过来的异常*/
try {
//创建一个InputStream字节输入流对象，用于接收mongodb
.properties配置文件中的配置参数
stream = MongoUtils
.class.get
ClassLoader()
.getResourceAsStream("mongodb
.properties");
//properties集合对象调用load()方法，将配置参数加载到properties集合中
properties
.load(stream);
} catch (IOException e) {
e
.printStackTrace();
}
//根据mongodb
.properties配置文件中的key，获取value值
host1 = properties
.getProperty("host1");
host2 = properties
.getProperty("host2");
host3 = properties
.getProperty("host3");
port = properties
.getProperty("port");
dbname = properties
.getProperty("dbname");
source = properties
.getProperty("source");
username = properties
.getProperty("username");
password = properties
.getProperty("password");
}
//2
.定义一个getMongoClient()方法，用于获取MongoDB副本集的连接对象
public static MongoClient getMongoClient() {
//指定用户名、用户认证书库、密码进行身份验证
MongoCredential credential = MongoCredential
.createCredential(username, source, password
.toCharArray());
//连接mongodb副本集
MongoClient mongoClient = MongoClients
.create(
MongoClientSettings
.builder()
.applyToClusterSettings(
builder ->builder
.hosts(
Arrays
.asList(
new ServerAddress("192
.168
.85
.101", 27017),
new ServerAddress("192
.168
.85
.102", 27017),
new ServerAddress("192
.168
.85
.103", 27017)
)))
.credential(credential)
.build());
return mongoClient;
}
//3
.定义一个getGridFSConn()方法，用于实现连接指定的MongoDB GridFS中的数据库
public static GridFSBucket getGridFSConn() {
MongoClient mongoClient = getMongoClient();
MongoDatabase mongoDatabase = mongoClient
.getDatabase(dbname);
//获取GridFS中数据库连接
GridFSBucket gridFSBucket = GridFSBuckets
.create(mongoDatabase);
return gridFSBucket;
}
}
本文介绍如何在 Eclipse IDE 中加载所需的类并使用 Import 命令进行导入。主要内容涉及 Eclipse 的基本操作和 Java 类文件的管理，适合初学者和需要复习此流程的开发者。
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