add: 移除文件UTF8 BOM头的小工具

Signed-off-by: Wendal Chen <[email protected]>

tools/org/nutz/tools/UTF8_BOM.java

@@ -0,0 +1,44 @@
+package org.nutz.tools;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.FileInputStream;
+
+import org.nutz.lang.Files;
+import org.nutz.lang.Streams;
+import org.nutz.lang.util.Disks;
+import org.nutz.lang.util.FileVisitor;
+
+public class UTF8_BOM {
+
+    public static void main(String[] args) {
+        final byte[] UTF_BOM = new byte[]{(byte) 0xEF, (byte) 0xBB, (byte) 0xBF};
+        final byte[] bom = new byte[3];
+        Disks.visitFile(new File("."), new FileVisitor() {
+
+            public void visit(File file) {
+                try {
+                    FileInputStream fis = new FileInputStream(file);
+                    fis.read(bom);
+                    if (bom[0] == UTF_BOM[0] && bom[1] == UTF_BOM[1] && bom[2] == UTF_BOM[2]) {
+                        System.out.println("Found BOM --> " + file);
+                        byte[] data = Streams.readBytes(fis);
+                        fis.close();
+                        Files.write(file, data);
+                        System.out.println("Fixed");
+                    }
+                }
+                catch (Throwable e) {
+                    e.printStackTrace();
+                }
+            }
+        }, new FileFilter() {
+
+            public boolean accept(File pathname) {
+                if (pathname.isDirectory())
+                    return true;
+                return pathname.getName().endsWith(".java") && pathname.length() > 3;
+            }
+        });
+    }
+}