IO之转换流、字符集

InputStreamReader/OutputStreamWriter:是字节流与字符流之间的桥梁，能将字节流转换为字符流，并且能为字节流指定字符集，可处理一个个的字符

InputStreamReader

    package com.yishan.io3;

    import java.io.*;

    /**
    * 转换流：InputStreamReader   OutputStreamWriter
    * 1.以字符集的形式操作字节流（纯文本的）
    * 2.指定字符集
    * @author : yishan
    * @date : 2020-09-08 10:28
    */
    public class ConvertTest {
        public static void main(String[] args) {
            //操作System.in 和 System.out
            try(
                BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
                BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));) {
            //循环获取键盘的输入（exit退出），输出此内容
                String msg = "";
                while (!msg.equals("exit")){
                    msg = reader.readLine();//循环读取
                    writer.write(msg);//循环写出
                    writer.newLine();
                    writer.flush();//强制刷新
                }
            }catch (IOException e){
                System.out.println("操作异常！");
            }
        }
    }



    package com.yishan.io3;

    import java.io.*;
    import java.net.URL;

    /**
    * 转换流：InputStreamReader   OutputStreamWriter
    * 1.以字符集的形式操作字节流（纯文本的）
    * 2.指定字符集
    * @author : yishan
    * @date : 2020-09-08 10:28
    */
    public class ConvertTest02 {
        public static void main(String[] args) {
            //操作网络流 下载百度的源代码
            Reader in;
            try(BufferedReader reader =new BufferedReader( new InputStreamReader(new URL("http://www.baidu.com").openStream(),"UTF-8"));){
                String msg;
                while ((msg=reader.readLine())!=null){
                    System.out.print(msg);
                }
            }catch (IOException e){
                System.out.println("操作异常！");
            }
        }

        public static void test2(){
            //操作网络流 下载百度的源代码
            try(InputStreamReader is = new InputStreamReader(new URL("http://www.baidu.com").openStream(),"UTF-8");){
                int temp;
                while ((temp=is.read())!=-1){
                    System.out.print((char) temp);
                }
            }catch (IOException e){
                System.out.println("操作异常！");
            }
        }
        public static void test1(){
            //操作网络流 下载百度的源代码
            try(InputStream is = new URL("http://www.baidu.com").openStream();){
                int temp;
                while ((temp=is.read())!=-1){
                    System.out.print((char) temp);
                }
            }catch (IOException e){
                System.out.println("操作异常！");
            }
        }
    }

OutputStreamWriter

    package com.yishan.io3;

    import java.io.*;
    import java.net.URL;

    /**
    * @author : yishan
    * @date : 2020-09-08 11:11
    */
    public class ConvertTest03 {
        public static void main(String[] args) {
            try(BufferedReader reader =
                        new BufferedReader
                                ( new InputStreamReader
                                        (new URL("http://www.baidu.com").openStream(),"UTF-8"));){
                BufferedWriter writer =
                        new BufferedWriter(
                                new OutputStreamWriter(
                                        new FileOutputStream("baidu.html")
                                )
                        );
                String msg;
                while ((msg=reader.readLine())!=null){
                    writer.write(msg);//字符集不统一出现乱码
                    writer.newLine();
                }
                writer.flush();
            }catch (IOException e){
                System.out.println("操作异常！");
            }
        }
    }

赏

谢谢你请我吃糖果