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();
        }
    }
}