JavaIO中的Reader和writer
1.reader package com.io.Reader; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStreamReader; public class InputStreamReaderTest { /**InputStreamReader类的用法 ,主要的是用于把 字节流改变成字符流 * @param args * @throws FileNotFoundException */ public static void main(String[] args) throws Exception { // TODO Auto-generated method stub InputStreamReader isr=new InputStreamReader(new FileInputStream("D:/Zhou.txt"),"utf-8"); //int data; //while((data=isr.read())!=-1){ // System.out.print((char)data); //} //budderedReader类 BufferedReader br=new BufferedReader(isr); System.out.println(br.readLine()); isr.close(); } } package com.io.Reader; import java.io.IOException; import java.io.StringReader; public class StringReaderTest { /**StringReader的用法 */ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub StringReader reader=new StringReader("ni hao 好"); int data; while((data=reader.read()) != -1){ System.out.println((char)data+" "); } reader.close(); } } 2.writer package com.io.writer; import java.io.*; public class FileUtil { /**copy文件的类 字符流的运用 * @param args * @throws Exception */ public void readFile(String fileName) throws Exception{ readfile(fileName, null); } public void readfile(String fileName,String charsetName) throws Exception{ InputStream in=new FileInputStream(fileName); InputStreamReader isr=null; if(charsetName==null){ isr=new InputStreamReader(in); }else{ isr=new InputStreamReader(in,charsetName); } BufferedReader br=new BufferedReader(isr); String data; while((data=br.readLine()) != null){ System.out.println(data); } br.close(); } public void copyFile(String from,String charsetFrom,String to,String charsetTo) throws Exception{ InputStream in=new FileInputStream(from); InputStreamReader reader; if(charsetFrom == null){ reader=new InputStreamReader(in); }else{ reader=new InputStreamReader(in,charsetFrom); } BufferedReader br=new BufferedReader(reader); OutputStream out=new FileOutputStream(to); OutputStreamWriter write=new OutputStreamWriter(out,charsetTo); BufferedWriter bw=new BufferedWriter(write); PrintWriter pw=new PrintWriter(bw); String data; while((data=br.readLine()) !=null){ pw.println(data); } pw.close(); br.close(); } public static void main(String[] args) throws Exception { // TODO Auto-generated method stub FileUtil fileUtil=new FileUtil(); fileUtil.readFile("D:/Zhou.txt"); fileUtil.copyFile("D:/Zhouhai.txt", "utf-8", "D:/Zhou.txt", "utf-8"); fileUtil.readFile("D:/Zhou.txt"); } }