java中字节和字符的转换操作

package com.ywx.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
/**
 * 字节和字符的转换操作
 * @author Vashon
 * date:20150403
 */
public class OutputStreamWriteDemo {
	public static void main(String args[]) throws Exception{
		File f=new File("d:"+File.separator+"testdemo.txt");
		stream1(f);
		stream2(f);
	}
	//写入:字符-->字节
	public static void stream1(File file) throws Exception{
		Writer out=null;
		//将字符流转换成字节流(写入的时候)
		out=new OutputStreamWriter(new FileOutputStream(file));
		out.write("这是一个美好的世界...hello world!");
		out.close();
	}//读取：字节-->字符
    public static void stream2(File file) throws Exception{
		Reader reader=null;
		reader=new InputStreamReader(new FileInputStream(file));
		char c[]=new char[1024];
		int len=reader.read(c);
		reader.close();
		System.out.println(new String(c,0,len));
	}
}

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