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();                }            }        }    }