转换流实现文件的读入和写出

/*
    综合使用InputStreamReader和OutputStreamWriter
     */
    @Test
    public void test2() throws IOException {
        //1.造文件、造流
        File file1 = new File("dbcp.txt");
        File file2 = new File("dbcp_gbk.txt");

        FileInputStream fis = new FileInputStream(file1);
        FileOutputStream fos = new FileOutputStream(file2);

        InputStreamReader isr = new InputStreamReader(fis, "utf-8");
        OutputStreamWriter osw = new OutputStreamWriter(fos, "gbk");

        //2.读写过程
        char[] cbuf = new char[20];
        int len;
        while ((len = isr.read(cbuf)) != -1){
            osw.write(cbuf, 0, len);
        }

        //3.关闭资源
        isr.close();
        osw.close();
    }