stream还是Reader Writer

stream是针对byte[]操作，针对于二进制文件操作。

Reader和Writer针对char操作，针对于文本文件操作。默认是用本机的编码方式写char ，如UTF-8和UTF-16和GB2312编码 
Reader和Writer是abstract类，不能直接用，一般用FileReader和FileWriter。 
如果采用具体编码，需要采用OutputStreamWriter。注意OutputStreamWriter的构造函数需要一个OutputStream的实例。 
BufferedReader和BufferedWriter针对普通Reader和Writer进行优化。 

PrintWriter 
另外PrintWriter可以支持一系列的print函数，也支持不同编码方式。 

PrintStream类似PrintWriter，提供了一系列print函数。例如System.out就是PrintStream。

 

编码方式 
OutputStreamWriter和PrintWriter都支持不同编码方式 
FileWriter只支持默认编码方式 

 

import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Arrays;

public class MyTest {

	public static void test1() throws IOException {
		FileOutputStream fos = new FileOutputStream("c:\\test.dat");

		byte[] buf = new byte[1024];
		Arrays.fill(buf, (byte) 'a');
		fos.write(buf);
		fos.close();
	}

	public static void test2() throws IOException {
		FileWriter writer = new FileWriter("c:\\test.txt");
		char c = 'A';
		String temp = "test";
		writer.write(c);
		writer.write(temp);
		writer.close();
	}
	
	public static void test3() throws IOException {

		OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(
				"c:\\test.txt"),"utf-8");
		
		writer.append("北京理工大学");
		
		writer.close();
	}	
	
	public static void test4() throws IOException {

		PrintWriter writer = new PrintWriter("c:\\1.txt", "utf-16");
		
		writer.append("北京理工大学");
		
		writer.close();
	}		

	public static void main(String[] args) throws IOException {

		test4();
		System.out.println("OK");
	}
}