读取main/resource下的.properties文件

古城微笑少年丶 2022-06-04 04:18 292阅读 0赞

**第一种方式：（在spring启动之前就可以使用）**

** 1、加入依赖：**

<dependency>
       <groupId>commons-configuration</groupId>
       <artifactId>commons-configuration</artifactId>
       <version>1.6</version>
    </dependency>

2、上代码：

public class ConfigManager {
       public static final ConfigManager configManager = new ConfigManager();
    
       private static Configuration config;
    
       private ConfigManager() {
          try {
             config = new PropertiesConfiguration("config/config.properties");
          } catch (ConfigurationException e) {
             e.printStackTrace();
          }
       }
    
       public static ConfigManager getInstance() {
          return configManager;
       }
    
       public String getConfig(String key) {
          return (String) config.getProperty(key);
       }
    
       public Configuration getConfig() {
          return config;
       }
    
    }

**第二种：（spring启动之后才可以使用）**

**1、加入spring-beans的jar包；**

**2、上代码：**

**在spring的配置文件中定义bean：**

<bean id="propertyConfigurer" class="com.test.PropertyPlaceholder">
        <property name="locations">
            <list>
                <value>classpath:config/config.properties</value>
                <value>classpath:config/*.properties</value>
            ......
            </list>
        </property>
    </bean>

public class PropertyPlaceholder extends PropertyPlaceholderConfigurer {
    
       private static Map<String, String> propertyMap;
    
       @Override
       protected void processProperties(
             ConfigurableListableBeanFactory beanFactoryToProcess,
             Properties props) throws BeansException {
          super.processProperties(beanFactoryToProcess, props);
          propertyMap = new HashMap<String, String>();
          for (Object key : props.keySet()) {
             String keyStr = key.toString();
             String value = props.getProperty(keyStr);
             propertyMap.put(keyStr, value);
          }
       }
    
       public static Object getProperty(String name) {
          return propertyMap.get(name);
       }
    
    }