java中指定编码操作文本文件

1.使用指定编码操作文本文件

    /**
     * 使用指定编码操作文本文件
     * 通过高效字符流拷贝文本文件，一行一行读取
     */
    @Test
    public void copyFile04(){
        BufferedReader reader = null;
        BufferedWriter writer = null;
        try {
            String sourceFileUrl = "C:\\Users\\admin\\Desktop\\testIO\\a.txt";
            String targetFileUrl = "C:\\Users\\admin\\Desktop\\testIO\\b.txt";
            //可以指定编码集，防止乱码
            reader = new BufferedReader(new InputStreamReader(new FileInputStream(sourceFileUrl),"utf-8"));
            writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(targetFileUrl),"utf-8"));
            //使用默认的编码集进行操作，utf-8
            //reader = new BufferedReader(new FileReader(sourceFileUrl));
            //writer = new BufferedWriter(new FileWriter(targetFileUrl));
            String line;
            while ((line=reader.readLine())!=null){
                writer.write(line);
                writer.newLine();//输出换行符
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            //在finally中关闭开启的流
            if (reader!=null){
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (writer!=null){
                try {
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }