转换流

1 编码：（程序）字符串 –>字节数组(文本文件) OutputStreamWriter

   解码： (文本文件)字节数组 –>字符串（程序）InputStreamReader

2 标准的输出流： System.out

   标准的输入流： System.in

package lianxi1;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

import org.junit.Test;

public class TestConvertStream {
@Test
  public void test1(){
    BufferedReader br = null;
    BufferedWriter bw = null;
    try {
        FileInputStream fis = new FileInputStream("Goodbye");
        InputStreamReader isr = new InputStreamReader(fis,"ISO-8859-1");
        br = new BufferedReader(isr);  // 参数是Reader接口，InputStreamReader是子类，接口的多态
        
        FileOutputStream fos = new FileOutputStream("GoodMood");
        OutputStreamWriter osr = new OutputStreamWriter(fos,"ISO-8859-1");
        bw = new BufferedWriter(osr);
        String str;
        if((str=br.readLine())!=null){
            bw.write(str);
            bw.newLine();
            bw.flush();
            
        }
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally{
        if(bw!=null){
            try {
                bw.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if(br!=null){
            try {
                br.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
}
}