在文件扩展名之前为文件名添加后缀

Question

我需要创建一个应用程序，在文件扩展名之前为某个文件名添加一些后缀。该应用程序采用一个强制性参数 - 配置文件的路径。我用 value/key:

做了一个 config.properties 文件

mode=copy（保留源文件） suffix=abc files=change.txt:further.txt:yandex.txt（后缀文件列表。文件路径以列:.分隔）

为了记录消息，我使用 java.util.logging。

如果无法识别来自配置的模式，则记录 Mode is not recognized: <mod_input_value> 严重级别并停止执行。示例：Mode is not recognized: copi
如果未设置后缀，则记录 No suffix is configured 严重级别并停止执行。
如果未指定文件，记录 No files are configured to be copied/moved 警告级别并停止执行。
如果指定文件之一不存在，则记录 No such file: <file-path> 严重级别，但不要停止其他文件的处理。请注意，消息中的文件路径不能包含反斜杠，而必须包含正斜杠 ('/') 以分隔路径部分。示例：No such file: src/test/resources/no-such-file.txt
复制文件时，在 INFO 级别记录 <source-file> -> <destination-file>。请注意，消息中的文件路径不能包含反斜杠，而必须包含正斜杠 (/) 以分隔路径部分，而不是反斜杠。示例：src/test/resources/file.txt -> src/test/resources/file-suffix.txt

我做了以下代码：

    public class Suffixing {
        public static String PATH_TO_PROPERTIES = "src/main/resources/config.properties";
    
        public static void main(String[] args) throws IOException {
    
            FileInputStream fileInputStream;
            Logger logging = Logger.getLogger(Suffixing.class.getName());
            Properties prop = new Properties();
    
            fileInputStream = new FileInputStream(PATH_TO_PROPERTIES);
            prop.load(fileInputStream);
            
            String mode = prop.getProperty("mode");
            String suffix = prop.getProperty("suffix");
            String files = prop.getProperty("files");

            File one = new File("D:/map/test/change.txt");
            File two = new File("D:/map/test/further.txt");
            File three = new File("D:/map/test/yandex.txt");
            for (String file : files.split(":")) {
    
                if (mode != "copy") {
                    logging.log(Level.SEVERE, "Mode is not recognized: " + mode);
                    fileInputStream.close();
                } else if (prop.getProperty(suffix) == "") {
                    logging.log(Level.SEVERE, "No suffix is configured");
                    fileInputStream.close();
                } else if (prop.getProperty("files") == "") {
                    logging.log(Level.WARNING, "No files are configured to be copied/moved");
                    fileInputStream.close();
                } else if (!one.exists() || !two.exists() || !three.exists()) {
                    logging.log(Level.SEVERE, "No such file: ");
                } else {
    
                    int at = file.indexOf('.');
                    String newFile = file.substring(0, at) + suffix + file.substring(at);
                    File dest = new File("D:/map/test" + newFile);
                    logging.log(Level.INFO, prop.getProperty("files") + "-->" + dest);
                }
            }
    
    
        }
    }

对于某些输入，代码运行不正确，我需要修改什么？

Answer 1

不要将 String 与 == 进行比较。您应该始终使用 equals() 代替。在 How do I compare strings in Java?.

阅读更多内容

话虽如此，请尝试以下操作：

public class Suffixing {
    public static String PATH_TO_PROPERTIES = "src/main/resources/config.properties";

    public static void main(String[] args) throws IOException {
        FileInputStream fileInputStream;
        Logger logging = Logger.getLogger(Suffixing.class.getName());
        Properties prop = new Properties();

        fileInputStream = new FileInputStream(PATH_TO_PROPERTIES);
        prop.load(fileInputStream);
        
        String mode = prop.getProperty("mode");
        String suffix = prop.getProperty("suffix");
        String files = prop.getProperty("files");

        File one = new File("D:/map/test/change.txt");
        File two = new File("D:/map/test/further.txt");
        File three = new File("D:/map/test/yandex.txt");
        for (String file : files.split(":")) {
            if (!Objects.equals(mode, "copy")) {
                logging.log(Level.SEVERE, "Mode is not recognized: " + mode);
                fileInputStream.close();
            } else if (prop.getProperty(suffix).isBlank()) {
                logging.log(Level.SEVERE, "No suffix is configured");
                fileInputStream.close();
            } else if (prop.getProperty("files").isBlank()) {
                logging.log(Level.WARNING, "No files are configured to be copied/moved");
                fileInputStream.close();
            } else if (!one.exists() || !two.exists() || !three.exists()) {
                logging.log(Level.SEVERE, "No such file: ");
            } else {
                int at = file.indexOf('.');
                String newFile = file.substring(0, at) + suffix + file.substring(at);
                File dest = new File("D:/map/test" + newFile);
                logging.log(Level.INFO, prop.getProperty("files") + "-->" + dest);
            }
        }
    }
}

Answer 2

如果您想在第一次出错时停止执行，您最好像这样更改所有错误日志记录：

logging.log(Level.SEVERE, "Mode is not recognized: " + mode);

抛出 RuntimeException（或您选择的任何合适的异常 class），例如：

throw new RuntimeException("Mode is not recognized: " + mode);

你应该整理你的文件处理，干净地加载属性：

Properties prop = new Properties();
try(var in = new FileInputStream(PATH_TO_PROPERTIES)) {
    prop.load(in);
}
String mode = prop.getProperty("mode");
String suffix = prop.getProperty("suffix");
String files = prop.getProperty("files");

在循环内进行所有这些检查是没有意义的，因为除非设置了“文件”，否则它们不会被执行，因此将它们从 for 循环中拉出来：

if (!Objects.equals(mode, "copy"))
    logging.log(Level.SEVERE, "Mode is not recognized: " + mode);
if (suffix == null || suffix.isBlank()) {
    logging.log(Level.SEVERE, "No suffix is configured");
}
if (files == null || files.isBlank()) {
    logging.log(Level.WARNING, "No files are configured to be copied/moved");
}

不清楚为什么需要 one/two/three 和这一行，如果文件是从 config.properties:

读取的

if (!one.exists() || !two.exists() || !three.exists()) {
     logging.log(Level.SEVERE, "No such file: ");

“文件”的循环应该使用 lastIndexOf() 以防目录名称中有点。

for (String file : files.split(":")) {
    File f = new File(file);
    if (!f.exists()) {
        logging.log(Level.SEVERE, "No such file: "+f);
    } else {
        int at = file.lastIndexOf('.');
        String newFile = file.substring(0, at) + "-" + suffix + file.substring(at);
        File dest = new File(newFile);
        logging.log(Level.INFO, f + "-->" + dest);
    }
}

split(":") 不适用于带有驱动器号的 Windows 路径，但您已在另一个 .

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