java学习之字符流与字节流的转换

 package com.io;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 /**
  * 字节流转为字符流读入
  * @author ganhang
  *
  */
 public class InputStreamReaderDemo {
     public static void main(String[] args) {
         File file =new File("1.txt");
         InputStream in;
         try {
             in = new FileInputStream(file);
             InputStreamReader isr=new InputStreamReader(in);
             int len=-1;
             StringBuffer sb=new StringBuffer();
             char []b=new char[10];
             while((len=isr.read(b))!=-1){
                 sb.append(b,0,len);
             }
             isr.close();
             in.close();
             System.out.println(sb);
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }

 package com.io;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 /**
  * 字符流转为字节写入
  * @author ganhang
  *
  */
 public class OutputStreamWriterDemo {
     public static void main(String[] args) {
         File file=new File ("1.txt");
         OutputStream out;
         try {
             out = new FileOutputStream(file,true);
             OutputStreamWriter osw=new OutputStreamWriter(out);
             String info="哈哈哈哈哈哈";
             osw.write(info);
             osw.close();
             out.close();
             System.out.println("写入成功!");
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }