java _io_转换流输入,将读取的百度源码输入到文件

不加装饰器:
OutputStreamWiter os = new OutputStreamWriter(new FileOutputStream("D:/d/baidu"),"UTF-8"); //不指定字符集，将默认为工程字符集

加装饰器:
BufferedWriter writer=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D:/d/baidu"),"UTF-8") );

try(BufferedReader reader=new BufferedReader(new InputStreamReader(new URL("http://www.baidu.com").openStream(),"UTF-8"));
    BufferedWriter writer=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D:/d/baidu.html"),"UTF-8")); //不指定字符集，默认是工程字符集
        )
{
    String s;
    while((s=reader.readLine())!=null)
    {
        writer.write(s);
        writer.newLine();
        writer.flush();
    }

}catch(IOException e)
{
    System.out.println("操作异常");
}