读取properties四种方式

前言

在项目开发中经常会用到配置文件，配置文件的存在解决了很大一份重复的工作。今天就分享四种在Springboot中获取配置文件的方式。

注：前三种测试配置文件为springboot默认的application.properties文件

#######################方式一#########################
com.battle.type3=Springboot - @ConfigurationProperties
com.battle.title3=使用@ConfigurationProperties获取配置文件
#map
com.battle.login[username]=admin
com.battle.login[password]=123456
com.battle.login[callback]=http://www.flyat.cc
#list
com.battle.urls[0]=http://ztool.cc
com.battle.urls[1]=http://ztool.cc/format/js
com.battle.urls[2]=http://ztool.cc/str2image
com.battle.urls[3]=http://ztool.cc/json2Entity
com.battle.urls[4]=http://ztool.cc/ua

#######################方式二#########################
com.battle.type=Springboot - @Value
com.battle.title=使用@Value获取配置文件

#######################方式三#########################
com.battle.type2=Springboot - Environment
com.battle.title2=使用Environment获取配置文件

一、@ConfigurationProperties方式

自定义配置类：PropertiesConfig.java

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.boot.context.properties.ConfigurationProperties;
//import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
/**
* 对应上方配置文件中的第一段配置
* @author battle
* @date 2017年6月1日 下午4:34:18
* @version V1.0
* @since JDK ： 1.7 */
@Component
@ConfigurationProperties(prefix = "com.zyd")
// PropertySource默认取application.properties
// @PropertySource(value = "config.properties")
public class PropertiesConfig {
    public String type3; public String title3;
    public Map<String, String> login = new HashMap<String, String>();
    public List<String> urls = new ArrayList<>();
    public String getType3() {
        return type3;
    }
    public void setType3(String type3) {
        this.type3 = type3;
    }
    public String getTitle3() {
        try {
            return new String(title3.getBytes("ISO-8859-1"), "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
            return title3;
        }
        public void setTitle3(String title3) {
            this.title3 = title3;
        }
        public Map<String, String> getLogin() { return login; }
        public void setLogin(Map<String, String> login) { this.login = login; }
        public List<String> getUrls() { return urls; }
        public void setUrls(List<String> urls) { this.urls = urls; } }

程序启动类：Applaction.java

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.zyd.property.config.PropertiesConfig;
@SpringBootApplication
@RestController
public class Applaction {
    @Autowired private PropertiesConfig propertiesConfig;
    /**
    * 第一种方式：使用`@ConfigurationProperties`注解将配置文件属性注入到配置对象类中
    * @throws UnsupportedEncodingException
    * @since JDK 1.7 */
    @RequestMapping( "/config" ) public Map<String, Object> configurationProperties()
                                                                                                                                                                                                                                                                                                                                             {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put( "type", propertiesConfig.getType3() );
        map.put( "title", propertiesConfig.getTitle3() );
        map.put( "login", propertiesConfig.getLogin() );
        map.put( "urls", propertiesConfig.getUrls() );
        return(map);
    }
    public static void main( String[] args ) throws Exception
                                                                                                                                                                                                                                                                                                                                             {
        SpringApplication application = new SpringApplication( Applaction.class );
        application.run( args );
    }
}

访问结果：
{"title":"使用@ConfigurationProperties获取配置文件",
"urls":["http://ztool.cc","http://ztool.cc/format/js","http://ztool.cc/str2image",
"http://ztool.cc/json2Entity","http://ztool.cc/ua"],
"login":{"username":"admin",
"callback":"http://www.flyat.cc","password":"123456"},
"type":"Springboot - @ConfigurationProperties"}
二、使用@Value注解方式
程序启动类：Applaction.java

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@RestController
public class Applaction {
    @Value("${com.zyd.type}") private String type;
    @Value("${com.zyd.title}") private String title;
    /** * * 第二种方式：使用`@Value("${propertyName}")`注解 *
     * @throws UnsupportedEncodingException * @since JDK 1.7 */
    @RequestMapping("/value") public Map<String, Object> value() throws UnsupportedEncodingException {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("type", type);
        // *.properties文件中的中文默认以ISO-8859-1方式编码，因此需要对中文内容进行重新编码
        map.put("title", new String(title.getBytes("ISO-8859-1"), "UTF-8"));
        return map;
        }
        public static void main(String[] args) throws Exception {
            SpringApplication application = new SpringApplication(Applaction.class);
             application.run(args);
        } }

访问结果：
{"title":"使用@Value获取配置文件","type":"Springboot - @Value"}

三、使用Environment
程序启动类：Applaction.java

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.core.env.Environment;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class Applaction {
    @Autowired private Environment env;
    /** * * 第三种方式：使用`Environment` * * @author zyd * @throws UnsupportedEncodingException * @since JDK 1.7 */
    @RequestMapping("/env") public Map<String, Object> env() throws UnsupportedEncodingException {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("type", env.getProperty("com.zyd.type2"));
        map.put("title", new String(env.getProperty("com.zyd.title2").getBytes("ISO-8859-1"), "UTF-8"));
        return map;
    }
    public static void main(String[] args) throws Exception {
        SpringApplication application = new SpringApplication(Applaction.class);
        application.run(args);
    }
}

访问结果：
{"title":"使用Environment获取配置文件","type":"Springboot - Environment"}
四、使用PropertiesLoaderUtils
app-config.properties

#### 通过注册监听器(`Listeners`) + `PropertiesLoaderUtils`的方式
com.battle.type=Springboot - Listeners
com.battle.title=使用Listeners + PropertiesLoaderUtils获取配置文件
com.battle.name=zyd
com.battle.address=Beijing
com.battle.company=in

PropertiesListener.java 用来初始化加载配置文件

import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;
import com.zyd.property.config.PropertiesListenerConfig;
public class PropertiesListener implements ApplicationListener<ApplicationStartedEvent> {
    private String propertyFileName;
    public PropertiesListener(String propertyFileName) {
        this.propertyFileName = propertyFileName;
    }
    @Override public void onApplicationEvent(ApplicationStartedEvent event) {
        PropertiesListenerConfig.loadAllProperties(propertyFileName);
    }
}

PropertiesListenerConfig.java 加载配置文件内容

import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;
import com.zyd.property.config.PropertiesListenerConfig;
public class PropertiesListener implements ApplicationListener<ApplicationStartedEvent> {
    private String propertyFileName;
    public PropertiesListener(String propertyFileName) {
        this.propertyFileName = propertyFileName;
    }
    @Override public void onApplicationEvent(ApplicationStartedEvent event) {
        PropertiesListenerConfig.loadAllProperties(propertyFileName);
    }
}

Applaction.java 启动类

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.zyd.property.config.PropertiesListenerConfig;
import com.zyd.property.listener.PropertiesListener;

@SpringBootApplication @RestController public class Applaction {
    /** * * 第四种方式：通过注册监听器(`Listeners`) + `PropertiesLoaderUtils`的方式 * * @author zyd * @throws UnsupportedEncodingException * @since JDK 1.7 */
    @RequestMapping("/listener") public Map<String, Object> listener() {
        Map<String, Object> map = new HashMap<String, Object>();
        map.putAll(PropertiesListenerConfig.getAllProperty());
        return map;
    }
    public static void main(String[] args) throws Exception {
        SpringApplication application = new SpringApplication(Applaction.class);
        // 第四种方式：注册监听器 application.addListeners(new PropertiesListener("app-config.properties")); application.run(args); } }

访问结果：

{"com.battle.name":"zyd",
"com.battle.address":"Beijing",
"com.battle.title":"使用Listeners + PropertiesLoaderUtils获取配置文件",
"com.battle.type":"Springboot - Listeners",
"com.battle.company":"in"}