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

@ConfigurationProperties註解

自定義配置類：PropertiesConfig.java

@Component
@ConfigurationProperties(prefix = "com.zyd")
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;
    }

} 

通過@PropertySource可以指定讀取的配置檔案，通過@Value註解獲取值，具體用法：

@Configuration //通過該註解來表明該類是一個Spring的配置，相當於一個xml檔案
@ComponentScan(basePackages = "cn.springboot.javaconfig") //配置掃描包
@PropertySource(value= {"classpath:jdbc.properties"})
public class SpringConfig {
    
    @Value("${jdbc.url}")
    private String jdbcUrl;

    }
    

}

如何配置多個配置檔案？

@PropertySource(value= {"classpath:jdbc.properties","xxx.properties"})

如果配置的配置檔案不存在會怎麼樣？

@PropertySource(value= {"classpath:jdbc.properties"},ignoreResourceNotFound=true)

使用Environment

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;
    @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);
    }
}

使用PropertiesLoadUtils

#### 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

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);
    }
}

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;


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

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 = new HashMap<String, Object>();
        map.putAll(PropertiesListenerConfig.getAllProperty());
        return map;
    }

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