读取配置文件信息

1. 需要导入 common-configuration2 包

<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-configuration2</artifactId>
            <version>2.6</version>
        </dependency>
        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
            <version>1.9.4</version>
        </dependency>

2. 配置文件信息 例如web工程中 resource中的文件 application.properties 文件

# Jedis
    #jedis的 host 名称
jedis.host=hadoop1

# Mongodb
    #mongo的host名称
mongo.host=hadoop1
    #mongo的port端口
mongo.port=27017

3. 代码实现

package com.atguigu.server.utils;

import org.apache.commons.configuration2.Configuration;
import org.apache.commons.configuration2.builder.fluent.Configurations;
import org.apache.commons.configuration2.ex.ConfigurationException;
import java.io.File;

public class Test {
    public static void main(String[] args) {
        Configurations configs = new Configurations();
        try {
            Configuration config = configs.properties(new File("application.properties"));
            String redisHost = config.getString("jedis.host");
            System.out.println(redisHost);
        } catch (ConfigurationException e) {
            e.printStackTrace();
        }
    }
}