一道JAVA IO面試題

將一個GBK編碼的文字檔轉存為一個UTF-8編碼的文字檔。

由於很久沒用IO流了，當時的代碼寫的相當混亂，現在整理如下：

import java.io.*;public class ChangeEncoding {public static void changeEncoding (String inEncoding, String outEncoding,String inFileName, String outFileName)  throws IOException {BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(inFileName), inEncoding));BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outFileName), outEncoding));String s = null;while ((s = reader.readLine()) != null) {writer.write(s, 0, s.length());writer.newLine();}writer.flush();writer.close();reader.close();}public static void main(String[] args) {try {changeEncoding("GBK", "UTF-8", "gbk.txt", "utf8.txt");} catch (IOException e) {System.out.println("轉換失敗，原因：" + e.getMessage());}}}

PS:BufferedWriter輸出的UTF-8檔案是無BOM格式編碼的。