Myadmini的专栏

——Java培训、Android培训、iOS培训、.Net培训、期待与您交流！ —— 自学视频io第二部分最后

这一讲重点部分，明白io流中这么多体系，怎么快速判断用哪种流。。。 1 1.1：明白源：InputStream Reader 1.2：明确目的：OutputStream Writer 2 是否是文本文件 是： 用Reader Writer 不是：用 InputStream OotputStream 3 是否要提高读写效率 是：BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(“luo.txt”))); 4 流的转换 字节流转换成字符流 InputStreamReader OutputStreamWriter

package com.itheima.www;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintStream;import java.io.UnsupportedEncodingException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Properties;import java.util.Scanner;/** * 接受键盘的录入 * * @author myluo * */{(String[] args) {methodSystemInfo();}() {// TODO Auto-generated method stubProperties pro=System.getProperties();try {pro.list(new PrintStream(“x5.txt”));} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}() {// TODO Auto-generated method stubScanner input=new Scanner(System.in);int num=0;System.out.print(“请输入：”);try {num=input.nextInt();} catch (Exception e) {// TODO: handle exceptiontry {PrintStreamps=new PrintStream(“luo.txt”);Date dt=new Date();SimpleDateFormat sdf=new SimpleDateFormat(“yyyy-MM-dd HH-mm-ss”);String date=sdf.format(dt);ps.println(date);e.printStackTrace(ps);} catch (FileNotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}() {// TODO Auto-generated method stubBufferedReader br=new BufferedReader(new InputStreamReader(System.in));BufferedWriter bw=null;try {bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(“E:/a/luo5551.txt”),”utf-8″));String len=null;try {while((len=br.readLine())!=null){bw.write(len);bw.flush();}bw.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}() {// TODO Auto-generated method stubBufferedReader br=new BufferedReader(new InputStreamReader(System.in));BufferedWriter bw=null;try {bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(“E:/a/luo555.txt”)));} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}String len=null;try {while((len=br.readLine())!=null){bw.write(len);bw.flush();}bw.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}() {/*** 1 ,明确源和目的*源：InputStream Reader*目的：OutputStream Writer** 2：是否是文本文件*是：Reader Writer*不是：InputStream OutputStream** 3:（Reader 和 Writer 体系中）是否要提高效率*BufferedReader br=new BufferedReader();*BufferedWriter bw=new BufferedWriter();**/try {//读取图片文件FileInputStream fs=new FileInputStream(“C:/Users/Administrator/Desktop/psb.jpg”);BufferedInputStream bis=new BufferedInputStream(fs);//写入图片文件FileOutputStream fos=new FileOutputStream(“E:/a/xx2.jpg”);//提高写入效率//BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));BufferedOutputStream bos=new BufferedOutputStream(fos);//String len=null;int len=-1;byte[] by=new byte[1024];try {while((len=bis.read(by))!=-1){bos.write(by,0,len);}bos.flush();bos.close();bis.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}() {try {BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(“C:/Users/Administrator/Workspaces/MyEclipse 8.5/System1/luo.tex”)));BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));String len=null;try {while((len=br.readLine())!=null){bw.write(len);bw.flush();}bw.close();br.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}() {BufferedReader br=new BufferedReader(new InputStreamReader(System.in));try {BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(“luo.tex”)));String len=null;try {while((len=br.readLine())!=null){if(“a”.equals(len)){break;}bw.write(len.toUpperCase());bw.flush();}bw.close();br.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}() {/*** 通过字符转换流* 把字节转换成字符**/BufferedReader br=new BufferedReader(new InputStreamReader(System.in));//把读出来对象打印在控制台BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));//读取字符流String len=null;try {while((len=br.readLine())!=null){bw.write(len.toUpperCase());//换行bw.newLine();bw.flush();}bw.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

我想要的，我一定会要得到。

，我不但的回首，伫足，然后时光扔下我轰轰烈烈的向前奔去。