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sysyruntimelibrary/source/FileUtil.java

+package utils;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.security.MessageDigest;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import java.util.Queue;
+
+/**
+ * @Author : YML
+ * @Description:
+ * @Date created at 2020/5/12 15:21
+ **/
+public class FileUtil
+{
+    /**
+     * 通过广度优先遍历获取一个目录下的所有文件的绝对路径
+     * @param dictionaryPath 目录的绝对路径
+     * @return  所有文件的绝对路径
+     */
+    public static List<String> getFilePathByBFS(String dictionaryPath){
+        List<String> ans = new ArrayList<>();
+        searchFilePathByBFS(dictionaryPath, file -> {
+            if(!file.isDirectory()){
+                ans.add(file.getAbsolutePath());
+            }
+            return false;
+        });
+        return ans;
+    }
+
+    public interface FileFoundCallBack{
+        boolean onFound(File file);
+    }
+
+    public static void searchFilePathByBFS(String dictionaryPath, FileFoundCallBack callBack){
+        Queue<String> queue = new ArrayDeque<>();
+        queue.add(dictionaryPath);
+        boolean breakFlag = false;
+        while (!breakFlag && !queue.isEmpty()){
+            String currentDicPath = queue.poll();
+            File currentDic = new File(currentDicPath);
+            if(!currentDic.exists() || !currentDic.isDirectory() ){
+                continue;
+            }
+            File[] files = currentDic.listFiles();
+            assert files != null;
+            for(File file: files){
+                if(callBack.onFound(file)){
+                    breakFlag = true;
+                    break;
+                }
+                if(file.isDirectory()){
+                    queue.add(file.getAbsolutePath());
+                }
+            }
+        }
+    }
+}