java学习之IO字符流

 package com.io;

 import java.io.*;
 /**
  * 文件字符流的读取
  * @author ganhang
  *
  */
 public class FileReaderDemo {
     public static void read(){
         File file =new File("1.txt");
         try {
             FileReader fr=new FileReader(file);
             StringBuffer sb=new StringBuffer();
             char [] cbuf=new char[10];
             int len=-1;
             while((len=fr.read(cbuf))!=-1){
                 sb.append(cbuf,0,len);
             }
             fr.close();
             System.out.println(sb);
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

     }
     public static void main(String[] args) {
         read();
     }
 }

 package com.io;

 import java.io.*;
 /**
  * 文件字符流的写入
  * @author ganhang
  *
  */
 public class FileWriterDemo {
     public static void write(){
         File file =new File("1.txt");
         try {
             FileWriter fr = new FileWriter(file,true);
             String str="哈哈哈哈";
             fr.write(str);
             fr.close();
             System.out.println("写入成功！");
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
     public static void main(String[] args) {
         write();
     }
 }