InputStreamReader和 OutputStreamWriter
new InputStreamReader(字节流,"UTF-8") //指定模式
将字节流转换为字符流，方便处理，比如能使用BufferedReader处理流 ** 可以处理字符集:InputStreamReader isr=new InputStreamReader(字节流,"UTF-8");** **网络流:**new URL("http://www.baidu.com").openStream(),这是一个字节流 **用装饰器装饰转换流转换成的字符流:**BufferedReader reader=new BufferedReader(new InputStreamReader(new URL("http://www.baidu.com").openStream(),"UTF-8"))
用转换流来读取键盘输入输出的字节流:
try(BufferedReader isr=new BufferedReader( new
InputStreamReader(System.in));
BufferedWriter osw=new BufferedWriter(new OutputStreamWriter(System.out));){
//键盘循环读取，exit退出
String s=" ";
while(!s.equals("exit"))
{
s=isr.readLine(); //按行读取
osw.write(s); //写出
osw.newLine();
osw.flush(); //强制刷新，因为数据太小无法输出，要满足一定kb才会自动输出
}
}
catch(IOException e)
{
System.out.println("操作异常");
}
操作网络流，读取百度源码:
使用装饰器:
//使用转换流，读取中文不会乱码
try(BufferedReader reader=new BufferedReader(new InputStreamReader(new URL("http://www.baidu.com").openStream(),"UTF-8"));
){ //网页的字符集是utf-8
//读取
String s;
while((s=reader.readLine())!=null)
{
System.out.println(s);
}
}
catch(IOException e)
{
System.out.println("操作异常");
}
}
不使用装饰器:
try(InputStreamReader is=new InputStreamReader(new URL("http://www.baidu.com").openStream());
){
//读取
int len;
while((len=is.read())!=-1)
{
System.out.print((char)len);
}
}
catch(IOException e)
{
System.out.println("操作异常");
}
