ADD file via upload

src/FileManager.java

@@ -0,0 +1,109 @@
+// filemanage.java
+import java.io.IOException;
+import java.nio.file.FileAlreadyExistsException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * 文件管理工具类，用于处理用户题目文件。
+ */
+public class FileManager {
+  private final List<String> fileLines = new ArrayList<>();
+
+  public static void main(String[] args) {
+    FileManager fileManager = new FileManager();
+    fileManager.createUserFile("张三1", "123");
+    fileManager.readUserFiles("张三1");
+    for (String line : fileManager.fileLines) {
+      System.out.println(line);
+    }
+    fileManager.writeToFile("张三1", "123", "1");
+  }
+
+  /**
+   * 获取用户目录中的所有文件名。
+   */
+  public static List<String> getFileNames(String userName) throws IOException {
+    Path directoryPath = Path.of("User-problem");
+    Path userDirectoryPath = directoryPath.resolve(userName);
+    try (var files = Files.list(userDirectoryPath)) {
+      return files.filter(Files::isRegularFile)
+              .map(path -> path.getFileName().toString())
+              .collect(Collectors.toList());
+    }
+  }
+
+  /**
+   * 读取指定用户的所有文件内容。
+   */
+  public void readUserFiles(String userName) {
+    Path directoryPath = Path.of("User-problem");
+    Path userDirectoryPath = directoryPath.resolve(userName);
+    try {
+      List<String> fileNames = getFileNames(userName);
+      for (String fileName : fileNames) {
+        Path filePath = userDirectoryPath.resolve(fileName);
+        try {
+          List<String> lines = Files.readAllLines(filePath);
+          fileLines.addAll(lines);
+        } catch (IOException exception) {
+          exception.printStackTrace();
+        }
+      }
+    } catch (IOException exception) {
+      //exception.printStackTrace();
+      //没读取到文件时无需处理，稍后新建文件
+    }
+  }
+
+  /**
+   * 向用户文件中写入内容。
+   */
+  public void writeToFile(String userName, String timestamp, String content) {
+    List<String> linesToWrite = new ArrayList<>();
+    linesToWrite.add(content);
+    String fileName = timestamp + ".txt";
+    Path directoryPath = Path.of("User-problem");
+    Path userDirectoryPath = directoryPath.resolve(userName);
+    Path filePath = userDirectoryPath.resolve(fileName);
+    try {
+      Files.write(filePath, linesToWrite, StandardOpenOption.APPEND);
+    } catch (IOException exception) {
+      exception.printStackTrace();
+    }
+  }
+
+  /**
+   * 为用户创建新文件。
+   */
+  public void createUserFile(String userName, String timestamp) {
+    String fileName = timestamp + ".txt";
+    try {
+      Path directoryPath = Paths.get("User-problem");
+      if (!Files.exists(directoryPath)) {
+        Files.createDirectories(directoryPath);
+      }
+
+      Path userDirectoryPath = directoryPath.resolve(userName);
+      if (!Files.exists(userDirectoryPath)) {
+        Files.createDirectories(userDirectoryPath);
+      }
+      Path filePath = userDirectoryPath.resolve(fileName);
+      Files.createFile(filePath);
+
+    } catch (FileAlreadyExistsException exception) {
+      // 文件已存在，无需操作
+    } catch (IOException exception) {
+      exception.printStackTrace();
+    }
+  }
+
+  public List<String> getFileLines() {
+    return fileLines;
+  }
+}