我可以重用这个读取属性文件的重复函数吗？

Question

我创建了一个函数，该函数读取给定的属性文件并返回一个包含信息的映射。这很有用，因为项目有多个文件。然而，1文件特别需要我不仅返回不同类型的映射，而且还需要一个额外的“if”子句。这真的让我很困惑，因为我觉得可能有一种方法可以避免重复所有这些代码

/**
 * Loads the given property file and places all it's content in a map
 * @param properties
 * @param fileDirectory
 */
public static Map<String, String> readProperties(Properties properties, String fileDirectory) {
    Map<String, String> propertiesFileContent = new HashMap<>();
    try {
        properties.load(new FileInputStream(fileDirectory));
    } catch (FileNotFoundException e) {
        Useful.printTimeStampedMessage(Constants.EXCEPTION_FILE_NOT_FOUND);
        e.printStackTrace();
    } catch (IOException e) {
        Useful.printTimeStampedMessage(Constants.EXCEPTION_IO);
        e.printStackTrace();
    }   
    
    for (String key : properties.stringPropertyNames()) {
        propertiesFileContent.put(key, properties.get(key).toString());
    }
    return propertiesFileContent;
}

/**
 * Loads the follow property file and places all it's content in a map
 * @param properties
 * @param fileDirectory
 */
public static Map<String, LocalDateTime> readFollowProperties(Properties properties, String fileDirectory) {
    Map<String, LocalDateTime> propertiesFileContent = new HashMap<>();
    try {
        properties.load(new FileInputStream(fileDirectory));
    } catch (FileNotFoundException e) {
        Useful.printTimeStampedMessage(Constants.EXCEPTION_FILE_NOT_FOUND);
        e.printStackTrace();
    } catch (IOException e) {
        Useful.printTimeStampedMessage(Constants.EXCEPTION_IO);
        e.printStackTrace();
    }   
    
    for (String key : properties.stringPropertyNames()) {
        if(!properties.get(key).equals("U") && !properties.get(key).equals("FB")) {
            propertiesFileContent.put(key, LocalDateTime.parse((CharSequence) properties.get(key)));
        }
    }
    return propertiesFileContent;
}

如您所见，这两个功能之间的差异非常小。

1. 贴图的类型从Map更改




Answer 1

您可以编写一个方法，并使其接受布尔值作为参数，如果布尔值为true，第一个版本将运行并返回一个Map

所以你的方法应该返回一个Map

// if you need to return Map<String, LocalDateTime> 
// you should pass true
// if you need to return Map<String,String> you should pass false
Map<String, ?> propsLoad(boolean activeStringStringReturn) throws FileNotFoundException, IOException {
    Properties prop = new Properties();
    prop.load(new FileInputStream("Put your Path here"));
    
    if (activeStringStringReturn== false) {
        Map<String, String> mapProp = prop.entrySet().stream()
                .collect(Collectors.toMap(e -> (String) e.getKey(), e -> (String) e.getValue()));
        return mapProp;
    } 
    else {
        Map<String, LocalDateTime> mapProp = prop.entrySet().stream()
                .filter(e -> !((String) e.getKey()).equals("U") && !((String) e.getKey()).equals("FB"))
                .collect(Collectors.toMap(e -> (String) e.getKey(), e -> LocalDateTime.parse((CharSequence) (e.getValue()) )));
        return mapProp;
    }
}