package com.mstf.ui;

import java.io.*;

public class TestWriter

{

public static void main(String args[]){

//PrintWriter做过滤流+FileWriter

//doFilter1();

//2、PrintWriter做过滤流+OutputStreamWriter

//doFilter2();

//3、PrintWriter可以作为节点流

//doNode();

//4、PrintWriter可以进行桥转换，接受一个OutputStream对象

doBridge();

}

//1、PrintWriter做过滤流+FileWriter

public static void doFilter1(){

FileWriter fw = null;

PrintWriter pw = null;

try{

//创建字符流

fw = new FileWriter("newPoem.txt");

//封装字符流的过滤流

pw = new PrintWriter(fw);

//文件写入

pw.println("阳关万里道，");

pw.println("不见一人归。");

pw.println("惟有河边雁，");

pw.println("秋来南向飞。");

}catch(IOException e){

e.printStackTrace();

}finally{

//关闭外层流

if(pw != null){

pw.close();

}

}

}

//2、PrintWriter做过滤流+OutputStreamWriter

public static void doFilter2(){

FileOutputStream fos = null;

OutputStreamWriter osw = null;

PrintWriter pw = null;

try

{

//创建字节流

fos = new FileOutputStream("newPoem.txt");

//通过桥连接，把字节流转变为字符流，并指定编码格式

osw = new OutputStreamWriter(fos,"UTF-8");//写入文件时指定编码格式

//封装字符流的过滤流

pw = new PrintWriter(osw);

//文件写入

pw.println("阳关万里道，");

pw.println("不见一人归。");

pw.println("惟有河边雁，");

pw.println("秋来南向飞。");

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}catch(UnsupportedEncodingException e){

e.printStackTrace();

}finally{

//关闭外层流

if(pw != null){

pw.close();

}

}

}

//3、PrintWriter可以作为节点流,构造器中可以接受File对象或者文件名

public static void doNode(){

PrintWriter pw = null;

try

{

//直接创建字符节点流，并输出

pw = new PrintWriter("newPoem.txt");

pw.println("阳关万里道，");

pw.println("不见一人归。");

pw.println("惟有河边雁，");

pw.println("秋来南向飞。");

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}finally{

//关闭外层流

if(pw != null){

pw.close();

}

}

}

//4、PrintWriter可以进行桥转换，接受一个outputStream对象，不能指定编码方式

public static void doBridge(){

FileOutputStream fos = null;

PrintWriter pw = null;

try

{

fos = new FileOutputStream("newPoem.txt");

pw = new PrintWriter(fos);

//文件写入

pw.println("阳关万里道，");

pw.println("不见一人归。");

pw.println("惟有河边雁，");

pw.println("秋来南向飞。");

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}finally{

//关闭外层流

if(pw != null){

pw.close();

}

}

}

}