Java中打印输出到文件

package tk.javazhangwei.others;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.Scanner;

/***
 * 1.system.in
 * 2.system.ou
 * 	system.err
 * 
 * @author zw
 *
 */
public class SystemDemo01 {
	public static void main(String[] args) throws FileNotFoundException  {
		//控制台到文件
		//重定向
		System.setOut(new PrintStream(new BufferedOutputStream(
				new FileOutputStream("d:/test/print.txt")),true));
		//加一个true相当于flush
		System.out.println("bbb");//控制台到文件
		
		//文件回控制台
		System.setOut(new PrintStream(new BufferedOutputStream(
				new FileOutputStream(FileDescriptor.out)),true));
		
		System.out.println("Hello,World!");
	}
	
	
	
	//出入流
	public static void test2() throws FileNotFoundException {

		InputStream is =System.in;
		is = new BufferedInputStream(new FileInputStream(new File("D:/test/print.txt")));
		Scanner sc = new Scanner(is);
		System.out.println(sc.nextLine());
	}
	
	//输出
	
	public static void test1() {
	    System.out.println("hello");
	    System.err.println("错误信息");
}
}