前言

在專案開發中經常會用到配置檔案，配置檔案的存在解決了很大一份重複的工作。今天就分享四種在Springboot中獲取配置檔案的方式。

注：前三種測試配置檔案為springboot預設的application.properties檔案

#######################方式一#########################
com.zyd.type3=Springboot - @ConfigurationProperties
com.zyd.title3=使用@ConfigurationProperties獲取配置檔案
#map
com.zyd.login[username]=zhangdeshuai
com.zyd.login[password]=zhenshuai
com.zyd.login[callback]=http://www.flyat.cc
#list
com.zyd.urls[0]=http://ztool.cc
com.zyd.urls[1]=http://ztool.cc/format/js
com.zyd.urls[2]=http://ztool.cc/str2image
com.zyd.urls[3]=http://ztool.cc/json2Entity
com.zyd.urls[4]=http://ztool.cc/ua

#######################方式二#########################
com.zyd.type=Springboot - @Value
com.zyd.title=使用@Value獲取配置檔案

#######################方式三#########################
com.zyd.type2=Springboot - Environment
com.zyd.title2=使用Environment獲取配置檔案

一、@ConfigurationProperties方式

自定義配置類：PropertiesConfig.java

package com.zyd.property.config;

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;

/**
 * 對應上方配置檔案中的第一段配置
 * @author <a href="mailto:[email protected]" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >yadong.zhang</a>
 * @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預設取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;
  }

} 

程式啟動類：Applaction.java

package com.zyd.property;

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;

/**
 * @author <a href="mailto:[email protected]" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >yadong.zhang</a>
 * @date 2017年6月1日 下午3:49:30 
 * @version V1.0
 * @since JDK ： 1.7
 */
@SpringBootApplication
@RestController
public class Applaction {

  @Autowired
  private PropertiesConfig propertiesConfig;

  /**
   * 
   * 第一種方式：使用`@ConfigurationProperties`註解將配置檔案屬性注入到配置物件類中
   * 
   * @author zyd
   * @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);
  }
}

訪問結果：

{"title":"使用@ConfigurationProperties獲取配置檔案","urls":["http://ztool.cc","http://ztool.cc/format/js","http://ztool.cc/str2image","http://ztool.cc/json2Entity","http://ztool.cc/ua"],"login":{"username":"zhangdeshuai","callback":"http://www.flyat.cc","password":"zhenshuai"},"type":"Springboot - @ConfigurationProperties"}

二、使用@Value註解方式

程式啟動類：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;

/**
 * @author <a href="mailto:[email protected]" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >yadong.zhang</a>
 * @date 2017年6月1日 下午3:49:30 
 * @version V1.0
 * @since JDK ： 1.7
 */
@SpringBootApplication
@RestController
public class Applaction {

  @Value("${com.zyd.type}")
  private String type;

  @Value("${com.zyd.title}")
  private String title;

  /**
   * 
   * 第二種方式：使用`@Value("${propertyName}")`註解
   * 
   * @author zyd
   * @throws UnsupportedEncodingException
   * @since JDK 1.7
   */
  @RequestMapping("/value")
  public Map<String,Object> value() throws UnsupportedEncodingException {
    Map<String,type);
    // *.properties檔案中的中文預設以ISO-8859-1方式編碼，因此需要對中文內容進行重新編碼
    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);
  }
}

訪問結果：

{"title":"使用@Value獲取配置檔案","type":"Springboot - @Value"}

三、使用Environment

程式啟動類：Applaction.java

package com.zyd.property;

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;

/**
 * @author <a href="mailto:[email protected]" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >yadong.zhang</a>
 * @date 2017年6月1日 下午3:49:30
 * @version V1.0
 * @since JDK ： 1.7
 */
@SpringBootApplication
@RestController
public class Applaction {

  @Autowired
  private Environment env;

  /**
   * 
   * 第三種方式：使用`Environment`
   * 
   * @author zyd
   * @throws UnsupportedEncodingException
   * @since JDK 1.7
   */
  @RequestMapping("/env")
  public Map<String,Object> env() throws UnsupportedEncodingException {
    Map<String,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);
  }
}

訪問結果：

{"title":"使用Environment獲取配置檔案","type":"Springboot - Environment"}

四、使用PropertiesLoaderUtils

app-config.properties

#### 通過註冊監聽器(`Listeners`) + `PropertiesLoaderUtils`的方式
com.zyd.type=Springboot - Listeners
com.zyd.title=使用Listeners + PropertiesLoaderUtils獲取配置檔案
com.zyd.name=zyd
com.zyd.address=Beijing
com.zyd.company=in

PropertiesListener.java 用來初始化載入配置檔案

package com.zyd.property.listener;

import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;

import com.zyd.property.config.PropertiesListenerConfig;

/**
 * 配置檔案監聽器，用來載入自定義配置檔案
 * 
 * @author <a href="mailto:[email protected]" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >yadong.zhang</a>
 * @date 2017年6月1日 下午3:38:25 
 * @version V1.0
 * @since JDK ： 1.7
 */
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 載入配置檔案內容

package com.zyd.property.config;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.springframework.beans.BeansException;
import org.springframework.core.io.support.PropertiesLoaderUtils;

/**
 * 第四種方式：PropertiesLoaderUtils
 * 
 * @author <a href="mailto:[email protected]" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >yadong.zhang</a>
 * @date 2017年6月1日 下午3:32:37
 * @version V1.0
 * @since JDK ： 1.7
 */
public class PropertiesListenerConfig {
  public static Map<String,String> propertiesMap = new HashMap<>();

  private static void processProperties(Properties props) throws BeansException {
    propertiesMap = new HashMap<String,String>();
    for (Object key : props.keySet()) {
      String keyStr = key.toString();
      try {
        // PropertiesLoaderUtils的預設編碼是ISO-8859-1,在這裡轉碼一下
        propertiesMap.put(keyStr,new String(props.getProperty(keyStr).getBytes("ISO-8859-1"),"utf-8"));
      } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
      } catch (java.lang.Exception e) {
        e.printStackTrace();
      }
    }
  }

  public static void loadAllProperties(String propertyFileName) {
    try {
      Properties properties = PropertiesLoaderUtils.loadAllProperties(propertyFileName);
      processProperties(properties);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  public static String getProperty(String name) {
    return propertiesMap.get(name).toString();
  }

  public static Map<String,String> getAllProperty() {
    return propertiesMap;
  }
}

Applaction.java 啟動類

package com.zyd.property;

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;

/**
 * @author <a href="mailto:[email protected]" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >yadong.zhang</a>
 * @date 2017年6月1日 下午3:49:30 
 * @version V1.0
 * @since JDK ： 1.7
 */
@SpringBootApplication
@RestController
public class Applaction {
  /**
   * 
   * 第四種方式：通過註冊監聽器(`Listeners`) + `PropertiesLoaderUtils`的方式
   * 
   * @author zyd
   * @throws UnsupportedEncodingException
   * @since JDK 1.7
   */
  @RequestMapping("/listener")
  public Map<String,Object> listener() {
    Map<String,Object>();
    map.putAll(PropertiesListenerConfig.getAllProperty());
    return map;
  }

  public static void main(String[] args) throws Exception {
    SpringApplication application = new SpringApplication(Applaction.class);
    // 第四種方式：註冊監聽器
    application.addListeners(new PropertiesListener("app-config.properties"));
    application.run(args);
  }
}

訪問結果：

{"com.zyd.name":"zyd","com.zyd.address":"Beijing","com.zyd.title":"使用Listeners + PropertiesLoaderUtils獲取配置檔案","com.zyd.type":"Springboot - Listeners","com.zyd.company":"in"}

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