Java中读取properties 文件

Properties properties = new Properties();

// 方法1
try {
    // 在加载的class文件中加载，文件是和类文件放在一下的
    ClassLoader loader = PropertiesUtil.class.getClassLoader();
    InputStream inStream = loader.getResourceAsStream("config.properties");
    properties.load(inStream);
    value = properties.getProperty(propKey);
} catch (Exception e) {
    logger.error("An error occured!");
}

// 方法2
try {
    // loadAllProperties直接使用路径
    properties = PropertiesLoaderUtils
            .loadAllProperties("E:/config.properties");
    properties.getProperty(propKey);
} catch (Exception e) {
    logger.error("An error occured!");
}

// 方法3
try {
    Resource resource = new ClassPathResource("config.properties");
    properties = PropertiesLoaderUtils.loadProperties(resource);
    value = properties.getProperty(propKey);
} catch (Exception e) {
    logger.error("An error occured!");
}

// 方法4
try {
    Resource resource = new ClassPathResource("config.properties");
    PropertiesLoaderUtils.fillProperties(properties, resource);
    value = properties.getProperty(propKey);
} catch (Exception e) {
    logger.error("An error occured!");
}