Java 获取properties的几种方式

spring下获取Properties方式

比如已有的commonConfig.properties

main.db.driverClassName=com.mysql.jdbc.Driver
main.db.url=jdbc\:mysql\://cloudpkdbrw.xxx.com\:3306/huagang?useUnicode\=true&characterEncoding\=UTF-8&zeroDateTimeBehavior\=convertToNull
main.db.username=huagang
main.db.password=xxxHGtest

在spring中引用commonConfig.properties

第1种:直接在spring的xml中使用


    
        
            classpath:/resources/config/commonConfig.properties
        
       
 
      
    
    
        
        
            ${main.db.driverClassName}
        
        
        
            ${main.db.url}
        
        
        
            ${main.db.username}
        
        
        
            ${main.db.password}
        
        
        
            1
        
        
        
            4
        
        
        
            1800
        
        
        
            1
        
        
        
            0
        
        
        
            1
        
        
        
            60
        
        
        
            30
        
        
        
            100
        
        
        
            false
        
        
        
            false
        
         
        
            true
        
        
        
            select 1 from dual
        
    

第2种:在java 启动加Conifg库中或者在controller中调用

import org.springframework.beans.factory.annotation.Value; 
import org.springframework.stereotype.Component; 
   
@Component 
public class Config {  
      @Value("${main.db.url}")   
      public  String jdbcUrl;  
    
}

controller

@RequestMapping("/service/**") 
@Controller 
public class TestController{ 
    
         @Value("${main.db.url}") 
         private String jdbcUrl; //直接在Controller引用 
         @RequestMapping(value={"/test"})  
        public ModelMap test(ModelMap modelMap) {  
               modelMap.put("jdbcUrl", Config.jdbcUrl); 
               return modelMap;  
          } 
     
}

第3种:不要在spring.xml中引用commonConfig.properties,在类注入时引用,然后使用Environment获取它的值

import org.apache.commons.lang3.tuple.Pair;
import org.redisson.Config;
import org.redisson.Redisson;
import org.redisson.SentinelServersConfig;
import org.redisson.SingleServerConfig;
import org.redisson.client.RedisClient;
import org.redisson.client.RedisConnection;
import org.redisson.client.protocol.RedisCommands;
import org.redisson.codec.SerializationCodec;
import org.redisson.misc.URIBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;

@Configuration
@PropertySource( "classpath:resources/config/commonConfig.properties" )  
public class RedissonConfig {
    
    @Autowired
    private Environment env;

    @Bean
    public SerializationCodec serializationCodec() {
        return new SerializationCodec();
    }

    @Bean
    public Config reddissonConfig() throws Exception {

     String jdbcUrl= env.getProperty("main.db.url");
}
          //此为代码片段

第4种:不需要借用spring,直接在类中读取.但要注意:(redisson.properties配置文件中不能有.句号),否则将报错

import java.util.ResourceBundle;


public class RedissionParamsUtil {
    
    /** 配置文件地址 */
    private final String configPath = "resources/config/redisson.properties";
 
 
    private static RedissionParamsUtil paramsUtil;
    
    ResourceBundle bundle = null;
    



    /**
     * 单例模式获取实例
     * @return MenuService
     */
    public static RedissionParamsUtil getInstance(){
        if(null==paramsUtil){
            paramsUtil = new RedissionParamsUtil();
        }
        return paramsUtil;
    }
    /**
     * 构造方法
     */
    private RedissionParamsUtil(){
          bundle = ResourceBundle.getBundle(configPath);
  }
    public String getValue(String key){
           return bundle.getString(key);
 }
    public static void main(String[] args) {
        System.out.println(RedissionParamsUtil.getInstance().getValue("jdbc_url"));
    }
     
}

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