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();
    }
}